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Sample records for kernforschungsanlage juelich

  1. Cost accounting in Kernforschungsanlage Juelich Gesellschaft mit beschraenkter Haftung (KFA)

    Seidel, G.; Schilling, H.

    1979-01-01

    The paper gives an overview about the organization and the research program of the Kernforschungsanalage Juelich Gesellschaft mit beschraenkter Haftung (KFA). The cost accounting system is discussed in detail, cost categories, cost centers, units of production and the data flow of the cost accounting are described. The distribution of the resulting management accounting reports and all sorts of EDP-result listings of the cost accounting system is described. (A.N.)

  2. List of reports of the Kernforschungsanlage Juelich published between October 1972 and December 1975

    1976-03-01

    This is a compilation of the Juel reports published by Kernforschungsanlage Juelich between October, 1972, and December, 1975. The compilation was made by automatic data processing. It applies to the fields mathematics, computers, kybernetics; general and solid state physics; plasma physics and fusion reactor technology; atomic and nuclear physics; reactor engineering, reactor physics, applied nuclear physics; thermionics and technical physics, organic, physical, radio-radiation and nuclear chemistry, analytical chemistry; chemical engineering, materials, general engineering; instruments and methods of measurement; biology and agriculture; medicine; environment, radiation protection; energy problems. (HK) [de

  3. Kernforschungsanlage Juelich, Institut fuer Kernphysik: Annual report 1983

    Baur, G.; Mayer-Boericke, C.; Schult, O.; Seyfarth, H.; Speth, J.; Turek, P.

    1984-04-01

    This annual report contains extended abstracts of the work performed at the named institute together with a list of publications. The abstracts deal with nuclear reactions, nuclear spectroscopy, atomic collisions, solar energy, and technical developments. See hints under the relevant topics. (HSI) [de

  4. KFA Juelich annual report 1986/87

    1987-01-01

    Basic and applied research almost keep the balance in the program of Kernforschungsanlage Juelich GmbH (KFA), one of the FRG's national research facilities. Multidisciplinary work of KFA in various fields of the natural sciences include nuclear medicine, nuclear chemistry, biotechnology, plasma physics/nuclear fusion, nuclear physics, energy and environmental resarch, multiparticle systems research, including related solid-state, surface, and vacuum physics research, and also problems of analyzing large-scale nonlinear systems. Future work will focus on the three major programs 'Materials development', 'Environmental chemicals and ecosystems', and 'Basic research on information technologies'. The chapter 'Examples of research work' contains topical contributions. The 'Report on R and D work' is a survey of all scientific-technical activities. The chapter 'Research institutes and joint scientific and technical facilities' describes tasks and targets of the entire KFA complex. (HK) [de

  5. The Juelich compact cyclotron - a multi-purpose irradiation facility

    Hemmerich, J.; Hoelzle, R.; Kogler, W.

    1977-01-01

    A commercially available variable-energy compact cyclotron has been installed at the Kernforschungsanlage Juelich. It is equipped to accelerate protons, deuterons, 3 He- and α-particles. A +- 60 0 switching magnet allows to switch the beam to any of seven external target stations. Three separately shielded target rooms allow a flexible use of the cyclotron for a wide range of applications such as production of short-lived nuclides, activation analysis, radiation damage studies in metals and studies of biological effects of fast neutron irradiation. (orig.) [de

  6. Forschungszentrum Juelich. Annual report 2013; Forschungszentrum Juelich. Jahresbericht 2013

    Frick, Frank; Roegener, Wiebke

    2014-07-15

    The annual report 2013 of the Forschungszentrum Juelich covers research activities, including high-lights of brain science, electrically controllable quantum bits, climate science and atmosphere research, knowledge management, including education and international cooperation, and an economic survey.

  7. Forschungszentrum Juelich. Annual report 2015

    Frick, Frank; Lueers, Katja; Roegener, Wiebke; Stettien, Annette; Trautwein, Ilse; Stahl-Busse, Brigitte

    2016-07-01

    The annual report 2015 of the Forschungszentrum Juelich covers research activities, including high-lights of brain science, electrically controllable quantum bits, climate science and atmosphere research, knowledge management, including education and international cooperation, and an economic survey.

  8. Forschungszentrum Juelich. Annual report 2013

    Frick, Frank; Roegener, Wiebke

    2014-07-01

    The annual report 2013 of the Forschungszentrum Juelich covers research activities, including high-lights of brain science, electrically controllable quantum bits, climate science and atmosphere research, knowledge management, including education and international cooperation, and an economic survey.

  9. Forschungszentrum Juelich. Annual report 2016; Forschungszentrum Juelich. Jahresbericht 2016

    Frick, Frank; Lueers, Katja; Roegener, Wiebke; Stahl-Busse, Brigitte

    2017-07-15

    The annual report 2016 of the Forschungszentrum Juelich covers research activities, including high-lights of structural biochemistry (Alzheimer research), material research (skyrmions), computer simulation (e.g. of flexible blood cells), quantum physics (100 qubit era), photovoltaics, battery research, environmental research, climate research, biotechnology and community codes, including education and international cooperation.

  10. Forschungszentrum Juelich. Annual report 2016

    Frick, Frank; Lueers, Katja; Roegener, Wiebke; Stahl-Busse, Brigitte

    2017-07-01

    The annual report 2016 of the Forschungszentrum Juelich covers research activities, including high-lights of structural biochemistry (Alzheimer research), material research (skyrmions), computer simulation (e.g. of flexible blood cells), quantum physics (100 qubit era), photovoltaics, battery research, environmental research, climate research, biotechnology and community codes, including education and international cooperation.

  11. Juelich Research Center. Annual report 1991

    1991-10-01

    The Research Centre Juelich (KFA) as one of the thirteen national research centres in the Federal Republic of Germany is probably unique in that it concentrates equally on four essentials for mankind - energy, health and environment, materials and matter as well as information. These basic requirements are reflected by the four priority programmes characterizing research at the KFA in the nineties. The research priorities are: Properties of Matter and Material Research; Basic Research on Information Technology; Health, Environment, Biotechnology; Energy Research and Technology; Nuclear Fusion; Basic Nuclear Research; Interdisciplinary Analyses and Methods. (orig./HSCH) [de

  12. The new polarized neutron reflectometer in Juelich

    Ruecker, U.; Alefeld, B.; Bergs, W.; Kentzinger, E.; Brueckel, T.

    1999-01-01

    On the basis of the HADAS spectrometer in the guide hall of the Juelich research reactor FRJ-2 a polarized neutron reflectometer is build with a 2D-position sensitive detector system. The new spectrometer is optimized for reflectivity and diffuse magnetic scattering measurements with small incident angles on thin magnetic films with thicknesses in the nm range. The polarization analyzer covers the whole detector area, so that a range of 2.5 deg in the scattering angle can be measured simultaneously. The analyzer consists of a stack of supermirrors tilted against the scattering plane. In this reflection geometry, the momentum transfer resolution of the instrument is not reduced, but the sample height is limited to 17 mm. For the monochromator, polarizer and collimation different setups have been compared on the basis of Monte-Carlo calculations: a focusing elliptical supermirror monochromator, a cylindrical mirror, a focusing pyrolytic graphite double monochromator and a double monochromator with bent perfect Si crystals. (author)

  13. Activities at Forschungszentrum Juelich in Safeguards Analytical Techniques and Measurements

    Duerr, M.; Knott, A.; Middendorp, R.; Niemeyer, I.; Kueppers, S.; Zoriy, M.; Froning, M.; Bosbach, D.

    2015-01-01

    The application of safeguards by the IAEA involves analytical measurements of samples taken during inspections. The development and advancement of analytical techniques with support from the Member States contributes to strengthened and more efficient verification of compliance with non-proliferation obligations. Since recently, a cooperation agreement has been established between Forschungszentrum Juelich and the IAEA in the field of analytical services. The current working areas of Forschungszentrum Juelich are: (i) Production of synthetic micro-particles as calibration standard and reference material for particle analysis, (ii) qualification of the Forschungszentrum Juelich as a member of the IAEA network of analytical laboratories for safeguards (NWAL), and (iii) analysis of impurities in nuclear material samples. With respect to the synthesis of particles, a dedicated setup for the production of uranium particles is being developed, which addresses the urgent need for material tailored for its use in quality assurance and quality control measures for particle analysis of environmental swipe samples. Furthermore, Forschungszentrum Juelich has been nominated as a candidate laboratory for membership in the NWAL network. To this end, analytical capabilities at Forschungszentrum Juelich have been joined to form an analytical service within a dedicated quality management system. Another activity is the establishment of analytical techniques for impurity analysis of uranium-oxide, mainly focusing on inductively coupled mass spectrometry. This contribution will present the activities at Forschungszentrum Juelich in the area of analytical measurements and techniques for nuclear verification. (author)

  14. Leakage in the Juelich research reactor

    Anon.

    1978-01-01

    On August 17, 1978, a leakage occurred in the DIDO research reactor. Early in the afternoon of this day, the valves of the coolant loop had been checked with the reactor shut off. When the mechanics wanted to oil a tight valve and drilled a hole in the valve cover for this, heavy water started to leak (leakage in the valve membrane). The mechanics left the shielded valve space at once; directly after having a shower, they underwent a radiation protection examination. It was found that none of the mechanics had been exposed to an excessive dose. When other mechanics in protective suits had closed the leak in the valve, a total of 150 liters had leaked into the sump pump at the valve entrance. They were pumped back into the cooling system. About 5 liters of water were evaporated and, via the stack, escaped into the environment. The activity released was about 40 curie; this is less than the permissible amount of 60 curie per week during normal operation. Neither the KFA personnel nor the inhabitants of Juelich and its surroundings were in danger at any moment. Calculations so far yield a maximum radiation exposure below 1mrem at the point of maximum exposure. The cooling circuit could be entered again only one day after the incident. The present shut-off phase of the reactor is not unduly prolonged by this accident. (orig./HP) [de

  15. CONDITIONING OF INTERMEDIATE-LEVEL WASTE AT FORSCHUNGSZENTRUM JUELICH GMBH

    Krumbach, H.

    2003-01-01

    This contribution to the group of low-level, intermediate, mixed and hazardous waste describes the conditioning of intermediate-level mixed waste (dose rate above 10 mSv/h at the surface) from Research Centre Juelich (FZJ). Conditioning of the waste by supercompaction is performed at Research Centre Karlsruhe (FZK). The waste described is radioactive waste arising from research at Juelich. This waste includes specimens and objects from irradiation experiments in the research reactors Merlin (FRJ-1) and Dido (FRJ-2) at FZJ. In principle, radioactive waste at Forschungszentrum Juelich GmbH is differentiated by the surface dose rate at the waste package. Up to a surface dose rate of 10 mSv/h, the waste is regarded as low-level. The radioactive waste described here has a surface dose rate above 10 mSv/h. Waste up to 10 mSv/h is conditioned at the Juelich site according to different conditioning methods. The intermediate-level waste can only be conditioned by supercompaction in the processing facility for intermediate-level waste from plant operation at Research Centre Karlsruhe. Research Centre Juelich also uses this waste cell to condition its intermediate-level waste from plant operation

  16. Ozone profiles at Juelich, FRG, during 1988 and 1989

    Smit, H.G.J.; Straeter, W.; Loup, H.; Kley, D.

    1989-12-01

    Ozone soundings were performed regular at Juelich, FRG (50deg 41' N, 6deg 24' E). This report, the first one of an intended series, contains information on technical aspects and presents vertical profiles obtained during 1988 and 1989. (orig.) [de

  17. Twenty-fifth anniversary of the Juelich Nuclear Research Center

    Haefele, W.

    1982-01-01

    On December 10, 1981, KFA Juelich celebrated its 25th year of existence; on December 11, 1956, the land parliament of North Rhine Westphalia had decided in favour of the erection of a joint nuclear research facility of the land of North Rhine Westphalia. In contrast to other nuclear research centers, the Juelich centre was to develop and operate large-scale research equipment and infrastructure for joint use by the universities of the land. This cooperation has remained an important characteristic in spite of the independent scientific work of KFA institutes, Federal government majorities, and changes in research fields and tasks. KFA does fundamental research in nuclear and plasma physics, solid state research, medicine, life sciences, and environmental research; other activities are R + D tasks for the HTR reactor and its specific applications as well as energy research in general. (orig.) [de

  18. New experimental results on electron cooling at COSY-Juelich

    Dietrich, J.; Maier, R.; Prasuhn, D.; Stein, H.J.; Kobets, A.; Meshkov, I.; Sidorin, A.; Smirnov, A.

    2007-01-01

    Recent results of electron cooling of proton beams at COSY-Juelich are reported. Cooling at an electron energy of 70 keV has been studied for the first time. At the injection energy level of COSY, corresponding to 24.5 keV electron energy, the features of the cooled proton beam at extremely low intensities have been investigated in order to find out whether an ordering of the proton beam can be achieved. Such investigations are motivated by the results of a numerical simulation of the ordering process by the BETACOOL code. (author)

  19. Radiochemical analysis in the nuclear research establishment (KFA) Juelich, FRG

    Anon.

    1975-01-01

    KFA Juelich is one of the two great nuclear research centres of the Federal Republic of Germany. About 3700 employees including about 700 scientists are engaged in a great number of programs and projects belonging to six main fields of research and development: high temperature reactor and energy techniques; nuclear fusion; properties of materials; materials research; life and environment; methods. In the article the radiochemical analysis work of the former Central Institute of Analytical Chemistry and its two successors is described: activation analysis, application of tracer techniques, fission product analysis. Further on the irradiation facilities are described, a short survey is given on the instrumentation, and the future work is outlined. (T.G.)

  20. Nuclear Research Centre Juelich (KFA). Annual report 1984/85

    1985-09-01

    The annual report from the Nuclear Research Centre in Juelich (KFA) consist of four differently coloured parts. The 'white part' - from the research - published topical contributions from authors writing popular science. Subjects were chosen from the viewpoint of a journalist rather than oriented on the research field of the KFA. The 'yellow part' - reports on research and development - is a survey of the scientific-technological work of KFA structured according to the main fields of research of KFA. The 'green part' - research institutes and scientific-technological joint ventures - describes tasks and objectives of the individual institutes/joint ventures. The 'blue part' - organisation, administration and technical infrastructure - contains information on management, organisation and administration of KFA (personnel department, PR, finances, purchase- and material disposal department, cost and planning, cooperation and use of know-how, projects, technical equipment). (orig.) [de

  1. PISCES and ALT-II: Juelich PSI papers

    Conn, R.W.; Hirooka, Y.; LaBombard, B.

    1988-08-01

    This publication comprises papers from the PISCES and ALT-II Programs at UCLA which were presented at the International Plasma Surface Interactions Meeting held in Juelich, FRG, on May 2-6, 1988. A list of publications from the PISCES and ALT-II contained in this report are: Deuterium pumping and erosion behavior of selected graphite materials under high flux plasma bombardment in PISCES; Erosion and redeposition behavior of selected NET-candidate materials under high-flux hydrogen, deuterium plasma bombardment in PISCES; Presheath profiles in simulated tokamak edge plasmas; Boundary asymmetries and plasma flow to the ALT-II toroidal belt pump limiter; ALT-II toroidal belt pump limiter performance in TEXTOR; and An in-situ spectroscopic erosion yield measurement with applications to sputtering and surface morphology alterations

  2. First internal and external experiments at COSY Juelich

    Prasuhn, D.; Maier, R.; Bechstedt, U.; Dietrich, J.; Hacker, U.; Martin, S.; Stockhorst, H.; Toelle, R.; Grzonka, D.; Nake, C.; Mosel, F.

    1995-01-01

    The inauguration of the cooler synchrotron COSY Juelich was celebrated on April 1st, 1993. After the first successful acceleration to proton momenta above 800 GeV/c, beamtimes for experiments were scheduled in parallel to further machine development. The first experiment was the internal target experiment EDDA, which investigated the energy dependence of the p-p interaction. It makes use of a 3x4 μm 2 thin CH 2 fiber as an internal target. The thickness of the fiber is more than adequate to achieve high luminosities, so the intensity of the stored beam has to be reduced to 10 7 p. On the other hand, it is thin enough to achieve beam lifetimes of 3 s at 1.4 GeV/c. Details of the target fabrication and the first experimental results will be discussed. Both external experimental facilities at COSY, the time-of-flight spectrometer, and the magnetic spectrometer BIG KARL use a liquid hydrogen (deuterium) target. The first experiments were carried out at proton energies between 300 MeV and 500 MeV. Also, these experimental data will be presented. Two further internal experiments are prepared for the installation into the COSY ring. The target for the first experiment is a gas-jet target, the second experiment uses ribbon targets for the interaction. The status of both experimental setups will be shown. (orig.)

  3. First internal and external experiments at COSY Juelich

    Prasuhn, D [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Maier, R [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Bechstedt, U [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Dietrich, J [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Hacker, U [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Martin, S [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Stockhorst, H [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Toelle, R [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Grzonka, D [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Nake, C [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Mosel, F [Bonn Univ. (Germany). Inst. fuer Strahlen- und Kernphysik

    1995-08-01

    The inauguration of the cooler synchrotron COSY Juelich was celebrated on April 1st, 1993. After the first successful acceleration to proton momenta above 800 GeV/c, beamtimes for experiments were scheduled in parallel to further machine development. The first experiment was the internal target experiment EDDA, which investigated the energy dependence of the p-p interaction. It makes use of a 3x4 {mu}m{sup 2} thin CH{sub 2} fiber as an internal target. The thickness of the fiber is more than adequate to achieve high luminosities, so the intensity of the stored beam has to be reduced to 10{sup 7} p. On the other hand, it is thin enough to achieve beam lifetimes of 3 s at 1.4 GeV/c. Details of the target fabrication and the first experimental results will be discussed. Both external experimental facilities at COSY, the time-of-flight spectrometer, and the magnetic spectrometer BIG KARL use a liquid hydrogen (deuterium) target. The first experiments were carried out at proton energies between 300 MeV and 500 MeV. Also, these experimental data will be presented. Two further internal experiments are prepared for the installation into the COSY ring. The target for the first experiment is a gas-jet target, the second experiment uses ribbon targets for the interaction. The status of both experimental setups will be shown. (orig.).

  4. Conditioning of intermediate-level waste at Forschungszentrum Juelich GmbH

    Krumbach, H.

    2003-01-01

    This contribution to the group of low-level, intermediate, mixed and hazardous waste describes the conditioning of intermediate-level mixed waste (dose rate above 10 mSv/h at the surface) from Research Centre Juelich (FZJ). Conditioning of the waste by supercompaction is performed at Research Centre Karlsruhe (FZK). The waste described is radioactive waste arising from research at Juelich. This waste includes specimens and objects from irradiation experiments in the research reactors Merlin (FRJ-1) and Dido (FRJ-2) at FZJ. In principle, radioactive waste at Forschungszentrum Juelich GmbH is differentiated by the surface dose rate at the waste package. Up to a surface dose rate of 10 mSv/h, the waste is regarded as low-level. The radioactive waste described here has a surface dose rate above 10 mSv/h. Waste up to 10 mSv/h is conditioned at the Juelich site according to different conditioning methods. The intermediate-level waste can only be conditioned by supercompaction in the processing facility for intermediate-level waste from plant operation at Research Centre Karlsruhe. Research Centre Juelich also uses this waste cell to condition its intermediate-level waste from plant operation. (orig.)

  5. ANKE, a new facility for medium energy hadron physics at COSY-Juelich

    Barsov, S.; Bechstedt, U.; Bothe, W.; Bongers, N.; Borchert, G.; Borgs, W.; Braeutigam, W.; Buescher, M.; Cassing, W.; Chernyshev, V.; Chiladze, B.; Dietrich, J.; Drochner, M.; Dymov, S.; Erven, W.; Esser, R.; Franzen, A.; Golubeva, Ye.; Gotta, D.; Grande, T.; Grzonka, D.; Hardt, A.; Hartmann, M.; Hejny, V.; Horn, L. van; Jarczyk, L.; Junghans, H.; Kacharava, A.; Kamys, B.; Khoukaz, A.; Kirchner, T.; Klehr, F.; Klein, W.; Koch, H.R.; Komarov, V.I.; Kondratyuk, L.; Koptev, V.; Kopyto, S.; Krause, R.; Kravtsov, P.; Kruglov, V.; Kulessa, P.; Kulikov, A.; Lang, N.; Langenhagen, N.; Lepges, A.; Ley, J.; Maier, R.; Martin, S.; Macharashvili, G.; Merzliakov, S.; Meyer, K.; Mikirtychiants, S.; Mueller, H.; Munhofen, P.; Mussgiller, A.; Nekipelov, M.; Nelyubin, V.; Nioradze, M.; Ohm, H.; Petrus, A.; Prasuhn, D.; Prietzschk, B.; Probst, H.J.; Pysz, K.; Rathmann, F.; Rimarzig, B.; Rudy, Z.; Santo, R.; Paetz Schieck, H.; Schleichert, R.; Schneider, A.; Schneider, Chr.; Schneider, H.; Schwarz, U.; Seyfarth, H.; Sibirtsev, A.; Sieling, U.; Sistemich, K.; Selikov, A.; Stechemesser, H.; Stein, H.J.; Strzalkowski, A.; Watzlawik, K.-H.; Wuestner, P.; Yashenko, S.; Zalikhanov, B.; Zhuravlev, N.; Zwoll, K.; Zychor, I.; Schult, O.W.B.; Stroeher, H.

    2001-01-01

    ANKE is a new experimental facility for the spectroscopy of products from proton-induced reactions on internal targets. It has recently been implemented in the accelerator ring of the cooler synchrotron COSY of the Forschungszentrum Juelich (FZ-Juelich), Germany. The device consists of three dipole magnets, various target installations and dedicated detection systems. It will enable a variety of hadron-physics experiments like meson production in elementary proton-nucleon processes and studies of medium modifications in proton-nucleus interactions

  6. Study on the construction of a combined cooler-synchroton ring at the KFA Juelich (COSY study)

    Gaul, G.; Hagedoorn, H.; Heide, J.A. van der; Hinterberger, F.; Huber, M.; Jahn, R.; Mayer-Kuckuk, T.; Paetz genannt Schieck, H.; Berg, G.; Hardt, A.; Martin, S.; Osterfeld, F.; Prasuhn, D.; Riepe, G.; Rogge, M.; Rossen, P. von; Schult, O.W.B.; Speth, J.; Turek, P.

    1984-02-01

    The project of a storage ring for the extension of the nuclear physics research facilities at the KFA Juelich is presented. Together with the construction of the ring the possibilities for physical research are described. (HSI) [de

  7. Development of closed orbit diagnostics towards EDM measurements at COSY in Juelich

    Hinder, Fabian [Forschungszentrum Juelich, Institut fuer Kernphysik IV (Germany); RWTH Aachen University, III. Physikalisches Institut B (Germany); Collaboration: JEDI-Collaboration

    2016-07-01

    Electric Dipole Moments (EDMs) violate parity and time reversal symmetries. Assuming the CPT-theorem, this leads to CP violation, which is needed to explain the matter over antimatter dominance in the Universe. Thus, a non-zero EDM is a hint to new physics beyond the Standard Model. The JEDI collaboration (Juelich Electric Dipole moment Investigations) has started investigations of a direct EDM measurement of protons and deuterons at a storage ring. To measure a tiny EDM signal with high precision, systematic effects have to be controlled to the same level. One major source of systematic uncertainties is a distortion of the closed orbit. To control and measure this effect, the orbit measurement system, including the readout electronics, the orbit correction system and the beam position monitor pick-ups are improved. All the mentioned developments are ongoing at the Cooler Synchrotron (COSY) at Juelich. The achievements in the mentioned fields are presented at the conference.

  8. Development of Mitsui/Juelich Incineration System and hydro-thermal ash solidification

    Suzuki, S.; Kamada, S.; Nakamori, Y.; Katakura, M.; Yamazaki, N.

    1988-01-01

    This paper summarizes the developing program for Mitsui/Juelich Incinerated System combined with Hydrothermal ash solidification. The system is an integrated one and capable for volume reduction of various kind of radioactive waste and safe disposal of residual incinerator ash. The system also has an advantage of reducing construction and operation cost. An outline of the incineration plant is also presented in this paper

  9. Incineration of dry burnable waste from reprocessing plants with the Juelich incineration process

    Dietrich, H.; Gomoll, H.; Lins, H.

    1987-01-01

    The Juelich incineration process is a two stage controlled air incineration process which has been developed for efficient volume reduction of dry burnable waste of various kinds arising at nuclear facilities. It has also been applied to non nuclear industrial and hospital waste incineration and has recently been selected for the new German Fuel Reprocessing Plant under construction in Wackersdorf, Bavaria, in a modified design

  10. Hypernuclear properties derived from the Juelich hyperon-nucleon interaction (in comparison with the Nijmegen interactions)

    Yamamoto, Y.; Reuber, A.; Himeno, H.; Nagata, S.; Motoba, T.

    1992-01-01

    The G-matrix interactions are derived from the Juelich YN interaction models A and B, compared with those from the Nijmegen models. The DDHF calculations for heavy Λ hypernuclei and the shell-model analysis for spin-doublet states of light hypernuclei are performed by use of the G-matrix interactions. It is demonstrated that the OBE models can be tested by the hypernuclear calculations. (author) 3 tabs., 5 figs., 23 refs

  11. Incineration of wastes from nuclear installations with the Juelich incineration process

    Wilke, M.

    1979-01-01

    In the Juelich Research Center a two-stage incineration process has been developed which, due to an integral thermal treatment stage, is most suitable for the incineration of heterogeneous waste material. The major advantages of this technique are to be seen in the fact that mechanical treatment of the waste material is no longer required and that off gas treatment is considerably facilitated. (orig.) [de

  12. Radiation protection monitoring for #betta#-radiation at the Juelich Nuclear Research Centre

    Keller, M.; Heinzelmann, M.

    1983-01-01

    A complete system for radiation protection monitoring also includes #betta#-radiation monitoring. This requires suitable dose rate meters, personal dosemeters and last but not least detailed information about possible radiation exposure due to #betta#-radiation. Since there are at present no suitable #betta#-dosemeters available on the market yet, a large nuclear research centre such as the KFA Juelich, where radioactive substances are being handled by more than 1600 persons, has the task of developing and deploying suitable dosemeters. The centre's accomplishments in this area are described

  13. Forschungszentrum Juelich GmbH, Institut fuer Kernphysik. Annual report 1991

    1992-03-01

    During the year 1991 the work concentrated on building the Cooler Synchrotron COSY-Juelich. The experimental activity was accompanied by theoretical studies in the field of medium energy nuclear physics. The preparation of COSY experiments concerned the realization of multipurpose facilities and other experiments. Work going on in the field of theoretical nuclear physics was strongly connected with research projects at COSY and processes induced in the proton-antiproton interaction. Through nuclear spectroscopy two-phonon octupole excitation had been identified in Gd-148. The ISIS ECR source has been used for the production of ion beams for atomic physics research. (DG)

  14. Scientific and technical publications of Juelich Research Centre, January 1988-June 1992

    1992-01-01

    The scientific and technical publications of Juelich Research Centre from January 1988 through June 1992 are listed under the following headings: General publications; Mathematics, computers, cybernetics; General physics; Atomic and nuclear physics; Solid state physics; Materials; Analytical chemistry; Engineering; Reactor Engineering; Metrology; Biology; Biotechnology; Agriculture; Energy; Medicine; Ecology; Plasma physics and fusion reactor technology; Physico-chemistry; Nuclear chemistry and radiochemistry; Chemical engineering; Electrical engineering, electronics; Geosciences. There is an author's index with report numbers (JUEL-, JUEL-BIBL-, JUEL-CONF, JUEL-SPEZ). (orig./BBR) [de

  15. PeDaB - the personal dosimetry database at the research centre Juelich

    Geisse, C.; Hill, P.; Paschke, M.; Hille, R.; Schlaeger, M.

    1998-01-01

    In May, 1997 the mainframe based registration, processing and archiving of personal monitoring data at the research centre Juelich (FZJ) was transferred to a client server system. A complex database application was developed. The client user interface is a Windows based Microsoft ACCESS application which is connected to an ORACLE database via ODBC and TCP/IP. The conversion covered all areas of personal dosimetry including internal and external exposition as well as administrative areas. A higher degree of flexibility, data security and integrity was achieved. (orig.) [de

  16. Seasonal trends of NH4+ and NO3- nitrogen isotope composition in rain collected at Juelich, Germany

    Freyer, H.D.

    1978-01-01

    Data are presented on nitrogen isotope composition in ammonium and nitrate from rain-water collected over 2 years in an interior area at Juelich, Germany. The seasonal trends in these data are discussed relative to natural and anthropogenic emissions of nitrogen compounds which additionally have been measured or estimated in their isotope composition, e.g. ammonia from animal urine, fuel combustion, fertilizer use and organic soil nitrogen, and natural and anthropogenic nitric oxides from automobile exhausts as well. The 15 N content of Juelich rain ammonium is found to be different from values of Hoering (1957) and Moore (1974) and from other rain samples collected in coastal areas. (Auth.)

  17. The programme 'fission product deposition' at the IRB of Juelich nuclear research centre

    Gottaut, H.; Iniotakis, N.; Malinowski, J.; Muenchow, K.H.; Sackmann, B.

    1976-01-01

    The transport and deposition behaviour of the non-gaseous fission and activation products in the primary circuit of HTR-type reactors determines the possibility of inspection and maintenance of single components of the primary circuit as well as the safety of the reactor in normal operation and during accidents. For the investigation of these problems, the programme 'fission product deposition' was started at Juelich nuclear research centre in 1969 in cooperation with a number of industrial firms. The programme covers in-pile and out-of-pile experiments, in which the HTR conditions are simulated as realistically as possible, as well as various laboratory experiments and extensive theoretical studies. It is the objective of this work to establish a realistic physical model and computer programme with which the transport and deposition of nuclides in the primary circuit of HTR reactors can be calculated in advance. A report is given on the experimental and theoretical studies carried out at the IRB of Juelich nuclear research centre. (orig./AK) [de

  18. Partitioning of minor actinides: research at Juelich and Karlsruhe Research Centres

    Geist, A.; Weigl, M.; Gompper, K.; Modolo, G.

    2007-01-01

    Full text of publication follows. The work on minor actinide (MA) partitioning carried out at Karlsruhe and Juelich is integrated in the EC FP6 programme, EUROPART. Studies include the DIAMEX process (co-extraction of MA and lanthanides from PUREX raffinate) and the SANEX process (separation of MA from lanthanides). Aspects ranging from developing and improving highly selective and efficient extraction reagents, to fundamental structural studies, to process development and testing are covered. SANEX is a challenge in separation chemistry because of the chemical similarity of trivalent actinides and lanthanides. The extracting agents 2,6-di(5,6-di-propyl-1,2,4-triazine-3-yl)pyridine (n-Pr-BTP), developed at Karlsruhe, and the synergetic mixture of di(chloro-phenyl)di-thio-phosphinic acid (R2PSSH) with tri-n-octyl-phosphine oxide (TOPO), developed at Juelich, are considered a breakthrough because of their high separation efficiency in acidic systems. Separation factors for americium over lanthanides of more than 30 (R2PSSH+TOPO) and 130 (n-Pr-BTP) are achieved. To gain understanding of these selectivities, comparative investigations on the structures of curium and europium complexed with these SANEX ligands were performed at Karlsruhe. Extended X-ray absorption fine structure (EXAFS) analysis revealed distinct structural differences between curium and europium complexed with R2PSSH + TOPO, though no such differences were found for n-Pr-BTP. These investigations were therefore complemented by time-resolved laser fluorescence spectroscopic investigations (TRLFS), showing complex stabilities and speciation to differ between n-Pr-BTP complexes of curium and europium. Kinetics of mass transfer was studied for both R2PSSH+TOPO and n-Pr-BTP systems. For the R2PSSH + TOPO system, diffusion was identified to control extraction rates. For the n-Pr-BTP system, a slow chemical reaction was identified as the rate-controlling process. These results were implemented into computer

  19. COSY Juelich - a cooler synchrotron for unpolarized and polarized medium-energy studies

    Seyfarth, H.

    2001-01-01

    Full text: The Forschungszentrum Juelich (Research Center Juelich) is one of the sixteen national research institutions in the 'Hermann von Helmholtz Association of German Research Centers'. It is dedicated to fundamental and applied research and development which can be summarized under five priorities: (i) structure of matter and materials research, (ii) information technology, (iii) life sciences, (iv) environment precaution research, and (v) energy technology. As one of the institutes within (i). the Institut fur Kernphysik (Institute for Nuclear Research) operates the COSY cooler synchrotron which allows to accelerate unpolarized and polarized protons and deuterons to the maximum momentum of 3450 MeV/c (2640 MeV and 2050 MeV kinetic energy for protons and deuterons, respectively). At low energy electron cooling can be used for beam preparation, whereas stochastic cooling can be applied to the accelerated beam. In the first years of operation since 1993 the experiments have been performed with the unpolarized proton beam. Since 1997 the polarized proton beam is available with increasing intensity and a typical degree of polarization of about 75 % up to the maximum beam energy. In 2000 the first unpolarized deuteron beam could be accelerated and stored at the maximum energy. Four target places exist for the internal experiments PISA. EDDA, COSY-II, and ANKE which use the circulating beam with thin solid strip or fiber targets and gas targets. The four experiments TOF, MOMO, GEM, NESSI, and JESSICA are using external beams. The programs of the experiments JESSICA (Juelich Experimental Spallation Setup in the COSY Area), NESSI (Neutron Scintillator and Silicon), and PISA (Proton Induced Spallation) aim at the measurement of data needed or the design of the target station of the planned European Spallation neutron Source (ESS). The set-up of PISA is replacing the earlier experiment COSY-13 which successfully completed its investigations on the production of

  20. Proceedings of the spring meeting of the Study Group for Electronic Instrumentation on April 3-5, 1995 in Juelich

    1995-06-01

    The 17 papers presented at the meeting give a survey of recent progress in the field of electronic instrumentation of scientific and technical measuring instruments, achieved at the research centers of KFA Juelich, TU Graz, HMI Berlin, Karlsruhe FZ, and Rossendorf FZ. (DG) [de

  1. Results of neutron measurements in the spectral position of the Juelich FKS steel irradiation capsules

    Schneider, W.

    1986-10-01

    This is a report on the planning and results of neutron monitoring in the capsules of the Juelich steel irradiation for the research project on component safety (FKS). The table of results and their discussion is provided specifically for the spectral positions (for characterising the neutron spectrum) in each of the types of irradiation capsules used. The results are given for the reaction rates of the neutron measurement reactions used (activation or fission reactions), for the neutron flux densities and fluxes derived from them related to the actual or at least plausible neutron spectra and finally for the radiation damage (or exposure) of the irradiated material calculated from them, expressed as the atomic displacement figure (dpa) and its percentage in sections of the neutron spectrum. (orig.) [de

  2. Special neutron measurement results from the spectral positions of the Juelich FKS steel irradiation capsules

    Schneider, W.; Kuepper, H.; Pott, G.; Borchardt, G.; Segelhorst, G.; Thoene, L.; Weise, L.

    1986-10-01

    For the German project 'Forschungsvorhaben Komponentensicherheit' (FKS, i.e., Structural Integrity of Components) steel specimen irradiations have been carried out in the Juelich Merlin-type reactor (FRJ-1). The neutron monitoring to these irradiations is described in a German report (Juel-2087). In this context, some special considerations and results are given here, i.e., an experimental investigation of the fast neutron spectrum variation over a thick steel plate (in a special dosimetry test experiment); a comparison of the outcome of this investigation with the results from other FKS participants; and finally, the evaluation of the neutron exposure expressed in displacements per atom (dpa) in the centre of that steel plate. (orig.)

  3. Design and construction of the HESR BPM prototype wire test bench at COSY, Forschungzentrum Juelich

    Srinivasan, Sudharsan; Kamerdzhiev, Vsevolod; Boehme, Christian [Forschungszentrum Juelich GmbH (Germany)

    2016-07-01

    The Institute of Nuclear Physics 4(IKP-4), of the Research Center Juelich (FZJ), is in charge of building and commissioning the High Energy Storage Ring (HESR) within the international facility, Facility for Antiproton and Ion Research (FAIR) at Darmstadt. Beam Position Monitors (BPMs) are an essential instrument for any accelerator allowing operators to accurately monitor and control the accelerated beam. The demand for a BPM test bench will be showcased which will help to assess the design's ability to meet the system requirements. The weight is on the factors considered for the development of the initial test bench, its functional components, the metrology tests for ensuring positional measurement accuracy, and the design modifications from metrology investigations leading to the conceptual development of a new test bench.

  4. A safeguards concept for the AVR fuel element storage areas at the KFA-Juelich

    Canty, M.J.; Buttler, R.

    1980-11-01

    The storage of spent AVR fuel in the KFA-Juelich has been discussed in relation to the obligations of the FRG under NPT. The present system of material accountancy and the associated procedures for physical inventory taking, while adequate from the operational standpoint, fall short of providing sufficient safequards for the fissile material involved. It is essential to complement existing controls by providing the safeguards authorities with the means of verifying the nuclear materials accountancy data of the storage facility operators. Due to the difficulties associated with the assay of irradiated fuel, the verification measurements must be carried out with the close cooperation of the operators. It was demonstrated that, given appropriate measuring devices, a high assurance for the non-diversion of a significant quantity can be obtained with an acceptable manpower effort. In this regard, the highly diluted form of the fissile material plays a favourable role. (orig.) [de

  5. Research center Juelich to install Germany's most powerful supercomputer new IBM System for science and research will achieve 5.8 trillion computations per second

    2002-01-01

    "The Research Center Juelich, Germany, and IBM today announced that they have signed a contract for the delivery and installation of a new IBM supercomputer at the Central Institute for Applied Mathematics" (1/2 page).

  6. Annual report of the nuclear safeguards project 1978

    Mache, H.R.

    1980-05-01

    The present report describes the major activities carried out in 1978 in the framework of the Nuclear Safeguards Project by the institutes of the Kernforschungszentrum Karlsruhe, Kernforschungsanlage Juelich, the European Institute of Transuranium Elements and some industrial firms. (orig.) [de

  7. Recent developments in solid oxide fuel cells at Forschungszentrum Juelich and in Europe

    Steinberger-Wilckens, Robert; Blum, L.; Buchkremer, H.P.; Haart, L.J.G. de; Malzbender, J. [Forschungszentrum Juelich GmbH (DE). Inst. fuer Energieforschung (IEF); Pap, M.; Gross, S.M. [Forschungszentrum Juelich GmbH (DE). Zentralabteilung Technologie (ZAT)

    2010-07-01

    The SOFC group at FZJ has assembled and tested more than 350 SOFC stacks rated between 100 W and 15 kW during the last 15 years. The research topics cover the whole SOFC development area from materials over stack design, manufacturing of cells, stacks and components, mechanical and electrochemical characterisation, up to system design and demonstration. Use of improved steels, cathodes and materials processing has resulted in reduced degradation rates around 4 mV (<0.50%) per 1000 hours at 800 C and 500 mA/cm{sup 2} over tested stack lifetimes of over 15 000 hours. Other stacks operating at 700 C have already reached over 22.000 hours of lifetime. However, the target of development is directed at even further lowered degradation for commercial operation in stationary applications. All stack tests are accompanied by disassembly and post-operative examinations investigating such phenomena as cathode degradation, corrosion, and other ageing phenomena. These analyses give a deep insight into the interaction of the stack materials and supply vital data on assessing the possibilities for prolonged stack operation over some 10's of thousand hours. This paper gives an overview and summary of achievements of Juelich developments. It also discusses the European perspectives in SOFC commercialisation. European manufacturers are holding a leading edge on the planar SOFC technology with new activities developing rapidly. (orig.)

  8. Applications of instrumental neutron activation analysis in the Analytical Division of the Research Center Juelich (KFA)

    Erdtmann, G.

    1991-12-01

    The Radioanalytical Chemistry Section, as a part of the Central Division of Chemical Analysis of the Research Center KFA Juelich, has the task to provide and to apply nuclear methods in the analytical service for the institutes and projects of the KFA and to customers outside. A great part of this service is trace element determinations by neutron activation analysis using the research reactor FRJ-2. The procedure for the instrumental technique is described and mainly practical aspects are reported in detail. It is based on the k 0 -method developed by Simonits and DeCorte. The results are calculated from the peak areas of the γ-lines and the corresponding k 0 -factors. A new variant of this procedure is required, if the program used for the deconvolution of the γ-spectra provides absolute decay rates of the radionuclides instead of the γ-emission rates. This variant is also described. Some examples of analyses carried out in the analytical service are presented and discussed mainly with respect to accuracy of the results and detection limits. (orig.) [de

  9. Core Facility of the Juelich Observatory for Cloud Evolution (JOYCE - CF)

    Beer, J.; Troemel, S.

    2017-12-01

    A multiple and holistic multi-sensor monitoring of clouds and precipitation processes is a challenging but promising task in the meteorological community. Instrument synergies offer detailed views in microphysical and dynamical developments of clouds. Since 2017 The the Juelich Observatory for Cloud Evolution (JOYCE) is transformed into a Core Facility (JOYCE - CF). JOYCE - CF offers multiple long-term remote sensing observations of the atmosphere, develops an easy access to all observations and invites scientists word wide to exploit the existing data base for their research but also to complement JOYCE-CF with additional long-term or campaign instrumentation. The major instrumentation contains a twin set of two polarimetric X-band radars, a microwave profiler, two cloud radars, an infrared spectrometer, a Doppler lidar and two ceilometers. JOYCE - CF offers easy and open access to database and high quality calibrated observations of all instruments. E.g. the two polarimetric X-band radars which are located in 50 km distance are calibrated using the self-consistency method, frequently repeated vertical pointing measurements as well as instrument synergy with co-located micro-rain radar and distrometer measurements. The presentation gives insights into calibration procedures, the standardized operation procedures and recent synergistic research exploiting our radars operating at three different frequencies.

  10. Iodine-123 and bromine-75 production and development program at Juelich

    Stoecklin, G.

    1985-01-01

    The iodine-123 and bromine-75 production and development program at the Nuclear Research Center in Juelich as of 1982 is described, and examples of recent 123 I- and 75 Br-analogue tracers that have been developed to the level of clinical trial are given. Iodine-123 is produced via the 127 I(d,6n) 123 Xe → 123 I process and by the 124 Te(p,2n) 123 I and 122 Te(d,n) 123 I reactions. These production methods are critically reviewed. Bromine-75-labeled benzodiazenes have been prepared for in vivo mapping of benzodiazepine receptor sites. The 7-( 75 Br)-5-(2-fluorophenyl)-1-methyl-1,3-dihydro-2H-1,4-benzodiazepine-2-one (BFB) was prepared with a specific activity of > 10 4 Ci/mmole. Finally, preparation and applications of the halogenated amino acid L-3-( 123 I)-iodo-α-methyltyrosine (IMT) and the analogous 75 Br compound (BMT) are reported. Both IMT and BMT have been successfully applied for pancreas imaging and tomography, and IMT has been used for imaging both melanotic and amelanotic malignant melanoma of the eye

  11. Main research activities at the Institute of Energy Process Engineering Research Centre Juelich Germany

    Achenbach, E.

    1995-06-01

    This report summarizes four lectures been held during the author's seven-week stay at the Department of High Temperature Engineering in the period from February 2nd to March 23rd in 1995 under the JAERI foreign researcher inviting program. Though the Institute of Energy Process Engineering(IEV) in the Research Centre Juelich(KFA), has recently changed the subject of research from nuclear technology of high-temperature gas-cooled reactors(HTGRs) to fuel cell technology, there are many common items of research. In particular, the following topics presented in the lectures are of mutual interest: 1)Methane-steam reforming used at JAERI as HTGR heat utilization system and applied at KFA to internal reforming in the high temperature Solid Oxide Fuel Cell(SOFC), 2)Technology and modeling of high temperature electrolysis at JAERI as the inverse process of the SOFC developed at KFA, 3)Flow simulation of branched systems treated at JAERI for the development of high temperature heat exchangers and performed at KFA with respect to the SOFC manifold system, 4)Fundamental aspects of heat and mass transfer. The report should help to create a basis of discussing the above mentioned problems and to stimulate the research work at JAERI. (author)

  12. The nuclear detectives. The international atomic energy agency IAEA is supposed to trace countries that produce or disseminate nuclear materials for nuclear weapons. A team from Juelich is supporting the process; Die Nukleardetektive. Die internationale Atomenergie-Organisation IAEO soll Staaten aufspueren, die heimlich nukleares Material fuer Atomwaffen herstellen oder verbreiten. Ein Juelicher Team unterstuetzt sie dabei

    Frick, Frank

    2015-07-01

    The Juelich Team is part of the International Standing Advisory Group on Safeguard Implementation that is supposed to find violations of the Non-Proliferation Treaty. Using wipe cloth in nuclear facilities it is possible to find uranium or plutonium containing particles. The study of the isotopic composition of uranium particles allows the identification of the uranium enrichment in the facility. In Juelich reference uranium particles with defined isotopic composition are produced for calibration purposes. The Juelich team supporting IAEA is also developing computer programs for the automatic processing of satellite data with respect to nuclear facilities.

  13. Six years of operational experience with a lead acid battery in the autonomous PV-hydrogen plant phoebus Juelich

    Meurer, C.; Brocke, W.A.; Emonts, B.; Heuts, G.; Mai, H.; Croe, D. [Forschungszentrum Juelich GmbH, Juelich (Germany). Inst. for Materials and Processes in Energy Systems IWV-3

    1999-07-01

    A set of 110 lead acid battery cells with a capacity of 1380 Ah was operated for six years in the PV-hydrogen plant PHOEBUS Juelich under realistic consumer and solar conditions. The plant is controlled by an energy management system that is specially designed for the use of a battery combined with a hydrogen long-term storage. The energy management system uses the state of charge SOC, which is determined by measurements of the battery current using validated models of the gassing current and the equilibrium voltage. It was found that after six years of operation there is hardly any fading of battery capacity. (orig.)

  14. Radioactivity monitoring by the official monitoring stations in North-Rhine Westphalia and the Juelich Nuclear Research Centre after the Chernobyl reactor accident

    1986-01-01

    This official report presents a governmental declaration of the prime minister of NRW, Mr. Rau, concerning the reactor accident at Chernobyl, and a joint declaration of ministers of NRW, concerning the impact of the accident on the Land NRW. These statements are completed by six official reports on radioactivity measurements carried out by the official monitoring stations of the Land and by the KFA Juelich. These reports inform about methods, scope, and results of the measuring campaigns accomplished by the Zentralstelle fuer Sicherheitstechnik (ZFS), the public materials testing office (MPA), the Chemisches Untersuchungsamt, the Landesamt fuer Wasser und Abfall, and the KFA Juelich. (DG) [de

  15. List of scientific and technological reports of the Nuclear Research Center Juelich Jan. 1985 - March 1988. 2. ed.

    1988-01-01

    This list of scientific and technological reports at first comprises some general publications such as abbreviations used in technical reports, annual report for 1984, 1985, 1986, the list of reports 1984 and 1985, surveys and inquiries on the population to the Chernobyl accident and on the scientific personnel of Juelich to the transfer of scientific knowledge to the public. - The other reports are concerned with the subjects mathematics - computer - cybernetics, general physics, atomic- and nuclear physics, solid state physics, materials, analytical chemistry, technology, reactor techniques, measuring techniques, biology, agriculture, questions of energy, medicine, environment, plasma physics and fusion reactor technology, physical chemistry, nuclear- and radiochemistry, chemical technology, electrotechniques - electronics, geosciences. Finally a register of the authors is added. (HK) [de

  16. Conceptual design of a rapid-cycling synchrotron for the KFA-Juelich spallation neutron source: working papers

    1983-01-01

    An accelerator group was established at ANL by the request of KFA-Juelich to carry out a conceptual design study and cost estimate for a rapid-cycling synchrotron as a possible first stage program on spallation neutron sources at KFA-Juelich. This set of notes is the individual notes which form the basis of the final report under this proposal prepared in January 1983. The topics covered include: SNQ Synchrotron Lattice-I; injection and extraction orbit; extraction from SNQ-SRA; SRA injection; capture and acceleration considerations in the SNQ-SRA; longitudinal coupling impedance; power supplies for SNQ synchrotron proposals; space charge limits in the SNQ-SRA; error analysis; SNQ-SRA ring magnets preliminary designs and cost; summary of CERN booster 4-ring arrangement; V-lattices for SNQ-SRA and extraction from the V-lattices; rf parameters for capture, acceleration and extraction; some parameters of the SNQ-SRA injector system; Keil-Schnell criterion; risetime of longitudinal resistive wall instability; beam scrapers; a design of the vacuum system; some aspects of vacuum consideration for SNQ-SRA; choice working points; ring magnet power supplies for shaped extaction of 1.1 GeV SNQ; ring magnet design and costs; tune shift due to the fringing field of the quadrupoles; coherent instability due to ions in the residual gas; transverse stabilization of bunched beams; rf acceleration system; injection into the SRA; Landau damping to get transverse stability; chromaticity and amplitude dependent tune controls in the SNQ-SRA; conversion of the SNQ-SRA to a compressor ring; comments on beam loss; summary of longitudinal stability study and transverse stability study for the SNQ-SRA; and the beam stay clear regions of the SNQ-SRA

  17. Solarthermie 2000 - Partial programme 3: Solar district heat - solar campus Juelich, feasibility study of the seasonal heat storage; Solarthermie 2000, Teilprogramm 3: Solare Nahwaerme - Solar-Campus Juelich, Machbarkeitsuntersuchung des saisonalen Waermespeichers

    Braxein, A. [Iwu - Ingenieurgesellschaft fuer Wasser und Umwelt mbH, Aachen (Germany); Spaete, F.; Repschlaeger, H. [Solar-Inst. Juelich (Germany); Friedel, J. [Stadtwerke Juelich (Germany)

    1998-12-31

    The heart of the solar-assisted district heating system for the solar campus Juelich is going to be a seasonal underground store with a capacity of 2,500 cubic metres, e.g. a rather small long-term storage. The aim of the project was to prove the technical and financial feasibility of the underground store by developing a building concept for the storage and to determine whether this concept was also suitable for larger storage facilities. The design of the floating lid and the suitability of various building materials were studied by means of a physical model. The resulting storage concept shows an underground storage pit whose shape is an inverted square pyramid base with a seal of double-layer PP-foil and a thermal insulation of pressure-resistant mineral wool in the upper part. The lid consists of 16 square walk-on floating containers with an edge length of 6.50 metres and a height of 1.0 metre each. Tests and calculations showed that the concept can be realised. The building costs for the small storage with a capacity of 2,500 cubic metres will amount to approx. DM 370 per cubic metre, costs for larger volumes of 25,000 cubic metres will amount to approx. DM 150 DM per cubic metre of water stored. (orig.) [Deutsch] Das Kernstueck der solargestuetzten Nahwaermeversorgung fuer den Solar-Campus Juelich soll ein 2500 m{sup 3} grosser, saisonaler Erdbeckenspeicher bilden, also ein relativ kleiner Langzeitspeicher. Ziel des Vorhabens war, die technische und finanzielle Machbarkeit des geplanten Erdbeckenspeichers durch ein baureifes Speicherkonzept nachzuweisen sowie die Uebertragbarkeit auf grosse saisonale Speicher gleicher Bauart zu untersuchen. Die konstruktive Ausbildung der schwimmenden Deckelkonstruktion sowie die Eignung verschiedener Baumaterialien wurden mit Hilfe eines physikalischen Modells untersucht. Das resultierende Speicherkonzept sieht einen Erdbeckenspeicher in Form eines umgedrehten, quadratischen Pyramidenstumpfes mit einer Abdichtung aus

  18. Investigations to the suitability of a computer-aided design system for mechanical construction in the ZAT of KFA Juelich

    Schoerner, M.; Koch, R.; Cordewiner, H.J.; Bachner, E.

    1983-06-01

    There is an extensive range of CAD systems in the marketplace which have been developed by various institutions for different types of applications and for different products, in some cases linked to specific hardware. Apart from such obvious features like prices, rates of sale and computer performance, other criteria such as documentation, ease of adaption and expansion, which are, as a rule, difficult to judge and quantify, play a decisive role. As an optimal CAD system does not exist in respect of every type of application the intended usage must be taken seriously into consideration when selecting a CAD system. On the basis of fundamental investigations of the suitability of CAD for the department for mechanical construction of ZAT at the KFA Juelich, the requirements and special needs of the construction process in the ZAT have been examined. In a short survey of the available CAD-systems a pre choice on the basis of some definitive musts has been made. The performance profile of the remaining systems has been thouroughly investigated and compared with the requirements of the ZAT. Thus the necessary decisions can be made on the basis of documented assessments. (orig.) [de

  19. FPGA-based upgrade of the read-out electronics for the low energy polarimeter at COSY/Juelich

    Hempelmann, Nils [Institut fuer Kernphysik, Forschungszentrum Juelich (Germany); Collaboration: JEDI-Collaboration

    2016-07-01

    The Cooler Synchrotron (COSY) is a facility for cooled polarized beams at the Forschungszentrum in Juelich. The Low Energy Polarimeter (LEP) is the polarimeter in the injection beam line of COSY. The beam polarization is measured using scattering off carbon and polyethylene (CH2) targets. The outgoing particles are detected using twelve plastic scintillators installed in groups of three to the left, to the right, above, and below the beam. The LEP is the routine tool for beam set-up, but its performance was limited by the old read-out electronics consisting of analog NIM modules. A new system using analog pulse sampling and an FPGA chip for signal processing was installed and tested. The ejectile particles were identified by relative time of flight measurement using a signal from the RF amplifier of the cyclotron used for acceleration as a reference. The new system is able to measure the time at which a particle arrives to an accuracy in the order of 50 ps. The presentation includes a review of available systems and a report about measurements in May and December 2015.

  20. The development of divertor and first wall armour parts at JAERI, Sandia N.L. and KFA Juelich

    Akiba, M.; Bolt, H.; Watson, R.; Kneringer, G.; Linke, J.

    1991-01-01

    The development of new armour materials, and fabrication and testings of the divertor and first wall mock-ups have worldwidely been carried out during the Conceptual Design Activites (CDA) of ITER. This paper is a review of the activities on the divertor and first wall armour components which has been performed by JAERI, Sandia National Laboratory, and KFA Juelich. The design requirements have instantly been reflected in material development. For instance, carbon fiber composites (CFCs) have already been developed to have a thermal conductivity as high as copper at room temperature. Further modification of CFC's has been made. Based on the extensive progress in armour materials, the fabrication and testings of mock-ups have been started. Divertor mock-ups which are able to endure a stationary heat flux of 8 to 15 MW/m 2 have already been developed. Some new high heat flux test facilities have been constructed and are able to simulate a heat load of plasma disruption. Extensive understanding on disruption erosion of the armour materials has been obtained by experiments with these facilities. Some mock-up tests and disruption simulating tests have been performed under international collaboration. (orig.)

  1. Heat transport the cold way

    Anon.

    1981-01-01

    A novel system for long-distance heat transport is being born in the 'Kernforschungsanlage Juelich' with the project being called 'Nukleare Fernenergie' (nuclear district energy). The project is also known as 'EVA/ADAM' [EVA = Einzelrohr-Versuchs-Anlage (single tube test facility); ADAM = Anlage mit Drei Adiabaten Methanisierungsreaktoren (plant provided with three adiabate methanising reactors)] and is based in principle on transport of energy in chemical bond within a closed loop. In the 60ies already this development was discussed both in the 'Kernforschungsanlage Juelich' and in the 'Rheinische Braunkohlenwerke' independent of each other. In 1975 these two organizations concluded a co-operation contract. (orig.) [de

  2. AGF activieties in the field of systems analysis and technology assessment

    1983-01-01

    Activities of the following West German organisation in the field of systems analysis are reviewed: Kernforschungsanlage Juelich (KFA), Kernforschungszentrum Karlsruhe (KfK), Deutsche Forschungs- und Versuchsanstalt fuer Luft- und Raumfahrt (DFVLR), Gesellschaft fuer Strahlen- und Umweltforschung (GSF), Gesellschaft fuer Mathematik und Datenverarbeitung (GMD), Max-Planck-Institut fuer Plasmaphysik (IPP). (UA) [de

  3. Nuclear safeguards project

    Mache, H.R.

    1978-10-01

    The present report describes the major activities carried out in 1977 in the framework of the Nuclear Safeguards Project by the institutes of the Kernforschungszentrum Karlsruhe, Kernforschungsanlage Juelich, the European Institute of Transuranium Elements and some industrial firms. (orig.) 891 HP 892 AP [de

  4. Forschungszentrum Juelich. Annual report 2012; Forschungszentrum Juelich. Jahresbericht 2012

    Frick, Frank; Roegener, Wiebke

    2013-07-15

    This annual report is structured as follows: 1 Highlight Energy Research (Next-generation batteries. Innovative material for the fuel cell. Smart material for solar cells. Store from midnight - Study on electromobility. Fuels from renewable electricity, carbon dioxide and water.). 2. Knowledge management (Create knowledge, pass knowledge, share knowledge and apply knowledge), and 3. Appendix (finance, boards and committees, organizational chart). [German] Dieser Jahresbericht ist wie folgt strukturiert: 1. Highlight Energieforschung (Batterien der naechsten Generation. Innovativer Werkstoff fuer die Brennstoffzelle. Smartes Material fuer Solarzellen. Laden ab Mitternacht - Studie zur Elektromobilitaet. Kraftstoffe aus Oekostrom, Kohlendioxid und Wasser). 2. Wissensmanagement (Wissen schaffen, Wissen weitergeben, Wissen teilen und Wissen anwenden) und 3. Anhang (Finanzen, Organe und Gremien, Organigramm).

  5. Forschungszentrum Juelich. Annual report 2011; Forschungszentrum Juelich. Jahresbericht 2011

    Frick, Frank; Roegener, Wiebke

    2012-07-15

    The annual report presents ten primary scientific reports selected for information of the general reader, representing the research priorities, a survey of the research and development programmes, a list of research institutes, cooperation agreements for technology transfer, facts and figures showing the organizational structure, personnel employed, financing aspects, and aspects of the service departments.

  6. Forschungszentrum Juelich. Annual report 2008; Forschungszentrum Juelich. Jahresbericht 2008

    Frick, Frank; Roegener, Wiebke

    2009-07-15

    The following topics are dealt with: The precise lattice QCD mass calculation of protons and neutrons by means of the JUGENE supercomputer, the early diagnosis of morbus Alzheimer, the fabrication of vertebra-column implants consisting of porus titanium, software for the improvement of the spatial resolution in electron microscopy by means of aberration corrections. (HSI)

  7. Forschungszentrum Juelich. Annual report 2009; Forschungszentrum Juelich. Jahresbericht 2009

    Frick, Frank; Roegener, Wiebke; Stahl-Busse, Brigitte

    2010-07-15

    The annual report presents ten primary scientific reports selected for information of the general reader, representing the research priorities, a survey of the research and development programmes, a list of research institutes, cooperation agreements for technology transfer, facts and figures showing the organizational structure, personnel employed, financing aspects, and aspects of the service departments.

  8. JUELICH: COSY acceleration and cooling

    Anon.

    1993-01-01

    The COSY cooler synchrotron at the KFA Forschungszentrum Jülich, inaugurated on 1 April, is now well on its way towards precision-defined high energy beams to open new fields for Jülich physics experiments. In two important goals, on 25 May the first beam cooled by electrons circulated inside the accelerator, then on 25 July physicists succeeded in accelerating the beam from the 270 MeV/c injection momentum to 600 MeV. Shortly after, this was pushed well above 1 GeV. Throughout the tuning process the number of stored particles increased steadily, finally peaking at 1.1 x 10 11 , a value compatible with the predicted limit at the injection energy. This success was the result of a painstaking search for the optimum parameter set, the commissioning crew being acutely aware that bringing such a large machine on line was a major experiment in its own right. The 3.3 GeV/c COSY machine belongs to the new class of hadron storage and cooler synchrotrons which started with CERN's LEAR low energy antiproton ring. COSY will 'sharpen' its beams to a narrow momentum spread using both electron and stochastic cooling to control the circulating particles. In addition it will provide space for internal experiments. Both features will allow for novel experimental approaches, and more than 100 physicists are eagerly waiting for the first proton reactions in their detectors

  9. Forschungszentrum Juelich. Annual report 2008

    Frick, Frank; Roegener, Wiebke

    2009-07-01

    The following topics are dealt with: The precise lattice QCD mass calculation of protons and neutrons by means of the JUGENE supercomputer, the early diagnosis of morbus Alzheimer, the fabrication of vertebra-column implants consisting of porus titanium, software for the improvement of the spatial resolution in electron microscopy by means of aberration corrections. (HSI)

  10. Quality control procedures on graphite, pyrocarbon and silconcarbide

    Koizlik, K. [comp.

    1974-09-01

    The presented report includes those papers presented at the 8th meeting of the DP-QCWP in Winfrith which have been written by collaborators of the Institut fuer Reaktorwerkstoffe der Kernforschungsanlage Juelich, together with other co-authors. The papers deal with problems of standardizing characterization methods for the routine quality control of graphites and pyrolytic carbons as well as with more basic procedures (transmission electron microscopy, microporosity) for the analysis of pyrocarbon structure.

  11. Utility and risk of nuclear energy

    Barnert, H.; Borsch, P.; Feldmann, A.; Merz, E.; Muench, E.; Oesterwind, D.; Voss, A.; Wolters, J.

    1979-09-01

    The present report contains lectures of a seminar that was arranged by the programme group nuclear power and environment of the Kernforschungsanlage Juelich . The items were: 1) Do we need nuclear energy. An attempt at a system analytic answer. 2) Energy production by means of nuclear fission. 3) The nuclear power plants. 4) Nuclear energy and radiation hazard. 5) Safety of nuclear power plants. (RW) [de

  12. Contributions for the third international carbon conference CARBON '80

    Delle, W.

    1980-05-01

    This report is a compilation of 8 papers prepared by KFA Juelich GmbH for the International Carbon Conference carbon 80 in Baden-Baden. The contributions deal mainly with materials problems which arise from the application of graphite and silicon carbide in High-Temperature Gas-Cooled Reactors, HTR. Most of the results described were obtained in the framework of the HTR Projects ''Hochtemperaturreaktor-Brennstoffkreislauf'' (High Temperature Reactor Fuel Cycle), HBK, that includes the partners Gesellschaft fuer Hochtemperaturreaktor-Technik mbH, Hochtemperaturreaktor-Brennelement GmbH, Hochtemperatur-Reaktorbau GmbH, Kernforschungsanlage Juelich GmbH, NUKEM GmbH and Sigri Elektrographit GmbH/Ringsdorff-Werke GmbH and ''Prototyp Nukleare Prozesswaerme'' (Prototype Nuclear Heat), PNP, for the development of procedures for the conversion of solid fossil raw materials by means of heat from High Temperature Gas-Cooled Reactors, that includes the partners Bergbau-Forschung GmbH, Gesellschaft fuer Hochtemperaturreaktor-Technik mbH, Hochtemperatur-Reaktorbau GmbH, Kernforschungsanlage Juelich GmbH and Rheinische Braunkohlenwerke AG. Both projects are financed by the Federal Ministry for Research and Technology and the State of North Rhine-Westphalia. (orig./IHOE) [de

  13. Maw and spent HTR Fuel Element Test storage in Boreholes in rock salt

    Barnert, E.; Brucher, P.H.; Kroth, K.; Merz, E.; Niephaus, D.

    1986-01-01

    The Budesminister fur Forschung und Technolgie (BMFT, Federal Ministry for Research and Technology) is sponsoring a project at the Kernforschungsanlage Julich (KFA, Juelich Nuclear Research Centre) entitled ''MAW and HTR Fuel Element Test disposal in Boreholes.'' The aim of this project is to develop a technique for the final disposal of (1) dissolver sludge, (2) cladding hulls/structural components and (3) spent HTR fuels elements in salt, and to test this technique in the abandoned Asse salt mine, including safety calculations and safety engineering demonstrations. The project is divided into the sub-projects I ''Disposal/sealing technique'' and II ''Retrievable disposal test.''

  14. Exploring some Australian energy alternatives using MARKAL

    Musgrove, A.R.D.; Stocks, K.J.; Essam, P.; Le, D.; Hoetzl, J.V.

    1983-01-01

    MARKAL is a linear programming model for the optimisation of the technologies associated with energy supply and demand within the complete energy system of a country as it evolves over a given time period. It was developed in the course of a project sponsored by the International Energy Agency, which was carried out at two main centres: Kernforschungsanlage, Juelich, FRG, and Brookhaven National Laboratory, Upton, New York, USA, Australia's participation in the Project has enabled the latest version of MARKAL to be installed on the computer at the Lucas Heights Research Laboratories together with the necessary supporting software programs.

  15. Contributions for the international conference on carbon and graphite CARBON '88

    Delle, W.

    1988-08-01

    This report is the compilation of three papers prepared by the Kernforschungsanlage Juelich GmbH (KFA) in collaboration with other partners for the International Conference CARBON '88. The topics were as follows: 1.) Fracture toughness of fast neutron irradiated graphite (W. Delle, H. Derz, G. Kleist, H. Nickel, W. Thiele); 2.) The irradiation creep characteristics of graphite to high fluences (C.R. Kennedy, M. Cundy, G. Kleist); and 3.) New silicon carbide materials starting with the Coat-Mix procedure (H.K. Luhleich, K. Bach, F.J. Dias, M. Kampel, F. Koch, H. Nickel). (orig./MM)

  16. A first wall material probe manipulator for the 'TEXTOR' tokamak

    Marmy, P.; Stiefel, U.

    1984-04-01

    Textor is a technology oriented tokamak of Euratom at the Kernforschungsanlage Juelich (KFA). Switzerland participates in its experimental program within the framework of the IEA agreement on Plasma Wall Interaction. A major task of EIR consists in the layout, construction and fabrication of a manipulator for the remote handling of up to 240 specimen candidate first wall materials. This operation has to be done without breaking the ultra high vacuum (UHV) and with wall temperatures up to 300 0 C. A great number of preexperiments involving different materials had to be carried out; the understanding of the tribology in ultra high vacuum could be improved. (Auth.)

  17. Research in Europe. Forschungszentrum Juelich. Annual report 2010; Forschen in Europa. Forschungszentrum Juelich. Jahresbericht 2010

    Frick, Frank; Roegener, Wiebke; Stahl-Busse, Brigitte

    2010-07-15

    Following the newest chronicle from April 2010 to March 2011, the annual report presents four highlights as well as a lot of contributions on the knowledge management. The annex of this annual report shows the organizational structure, personnel employed, financial aspects, and the contact information.

  18. Forschungszentrum Juelich, Institut fuer Kernphysik/COSY. Annual report 2009

    Buescher, Markus; Hanhart, Christoph; Krewald, Siegfried; Machner, Hartmut; Maier, Rudolf; Meissner, Ulf G.; Ritman, James; Stockhorst, Hans; Stroeher, Hans (eds.)

    2010-05-15

    The following topics were dealt with: Physics at COSY, COSY operation and developments, further experimental activities, theoretical investigations, preparation of the HESR, the PANDA experiment. (HSI)

  19. Forschungszentrum Juelich, Institut fuer Kernphysik. Annual report 1993

    Baur, G.; Filges, D.; Kilian, K.; Maier, R.; Rossen, P. v.; Schult, O.; Seyfarth, H.; Speth, J.; Turek, P.

    1994-02-01

    The annual report contains extended abstracts about the work performed in the named research center in 1993 together with a list of talks and publications. The work concerns experimental and theoretical studies on medium and high energy physics, nuclear spectroscopy, nuclear structure and reaction mechanisms, developments of the cooler synchrotron COSY, isochronous cyclotron and ion sources, the magnetic spectrometer BIG KARL, as well as technical developments on data acquisition and processing, electronics, detector and targets, and ESS. (DG)

  20. Forschungszentrum Juelich, Institut fuer Kernphysik/COSY. Annual report 2010

    Buescher, Markus; Grzonka, Dieter; Hanhart, Christoph; Krewald, Siegfried; Maier, Rudolf; Meissner, Ulf G.; Ritman, James; Stockhorst, Hans; Stroeher, Hans (eds.)

    2011-04-15

    The following topics are dealt with: Physics at COSY, COSY operation and developments, further experimental activities, theoretical investigations, preparation of the HESR, the PANDA experiments. (HSI)

  1. A polarized atomic-beam target for COSY-Juelich

    Eversheim, P. D.; Altmeier, M.; Felden, O.; Glende, M.; Walker, M.; Hiemer, A.; Gebel, R.

    1998-01-01

    An atomic-beam target (ABT) for the EDDA experiment has been built in Bonn and was tested for the very first time at the cooler synchrotron COSY. The ABT differs from the polarized colliding-beams ion source for COSY in the DC-operation of the dissociator and the use of permanent 6-pole magnets. At present the beam optics of the ABT is set-up for maximum density in the interaction zone, but for target-cell operation it can be modified to give maximum intensity. The modular concept of this atomic ground-state target allows to provide all vector- (and tensor) polarizations for protons and deuterons, respectively. Up to now the polarization of the atomic-beam could be verified by the EDDA experiment to be > or approx. 80% with a density in the interaction zone of > or approx. 10 11 atoms/cm 2

  2. 1-cycle SANEX process development studies performed at Forschungszentrum Juelich

    Wilden, Andreas; Sypula, Michal; Schreinemachers, Christian; Kluxen, Paul; Modolo, Giuseppe

    2010-01-01

    In the framework of our research activities related to the partitioning of spent nuclear fuel solutions, the direct selective extraction of trivalent actinides from a simulated PUREX raffinate solution (1-cycle SANEX) was studied using a mixture of CyMe 4 BTBP and TODGA. The solvent showed a high selectivity for trivalent actinides with a high lanthanide separation factor. However the co-extraction of some fission products, such as Cu, Ni, Zr, Mo, Pd, Ag and Cd was observed. The extraction of Zr and Mo could be suppressed using oxalic acid but the use of the well-known Pd complexant HEDTA was unsuccessful. During screening experiments with different amino acids, the sulphur-bearing amino acid L-Cysteine showed good complexation of Pd and prevented its extraction into the organic phase without influencing the extraction of trivalent actinides. A strategy for a single-cycle process is proposed within this paper. (authors)

  3. Forschungszentrum Juelich, Institut fuer Kernphysik/COSY. Annual report 2009

    Buescher, Markus; Hanhart, Christoph; Krewald, Siegfried; Machner, Hartmut; Maier, Rudolf; Meissner, Ulf G.; Ritman, James; Stockhorst, Hans; Stroeher, Hans

    2010-05-01

    The following topics were dealt with: Physics at COSY, COSY operation and developments, further experimental activities, theoretical investigations, preparation of the HESR, the PANDA experiment. (HSI)

  4. The Hot Cell Radioactive Waste Concept of Forschungszentrum Juelich

    Pott, G.; Halaszovich, St.

    1999-01-01

    During the last 30 years extensive scientific examinations on radioactive metals,ceramics and fuel elements have been carried out, so that a high volume of waste has resulted. Also from the dismantling of irradiated facilities metallics waste has o be handed. Prior for equipment repair the hot cell involved has to be decontaminated and a large amount of lower active waste is produced. The waste is collected for conditioning and storing. There are different categories as: low active liquid waste, low active burnable waste, fuel waste, low and high active metallic waste. For each waste category special transport container are used. For the volume reduction our Waste Department is equipped with special facilities e.g.: furnace for burning, drying, liquids evaporators, hydraulic press for pelletizing, decontamination box for the dismantling ad cleaning of components. After conditioning the waste will be stored on site or transported to final storage in a salt mine (ERAM) . Special documentation has to be done for the acceptance of this waste

  5. Forschungszentrum Juelich, Institut fuer Kernphysik/COSY. Annual report 2010

    Buescher, Markus; Grzonka, Dieter; Hanhart, Christoph; Krewald, Siegfried; Maier, Rudolf; Meissner, Ulf G.; Ritman, James; Stockhorst, Hans; Stroeher, Hans

    2011-04-01

    The following topics are dealt with: Physics at COSY, COSY operation and developments, further experimental activities, theoretical investigations, preparation of the HESR, the PANDA experiments. (HSI)

  6. Status of the cooler synchrotron COSY Juelich. Papers

    1994-09-01

    The eight papers present the status of COSY, operational characteristics of the COSY electron cooler, a broad-band multiple-harmonic acceleration structure, diagnostic tools, a stochastic cooling system, a narrow-band digital RF-noise generator, an RF-synthesizer, and a longitudinal phase space tracking of particles in a multiple harmonic RF-system. (DG)

  7. Forschungszentrum Juelich, Institut fuer Kernphysik/COSY. Annual report 2007

    Buescher, M.; Hanhart, C.; Krewald, S.; Machner, H.; Maier, R.; Meissner, U.G.; Ritman, J.; Stockhorst, H.; Stroeher, H. (eds.)

    2008-03-15

    The following topics are dealt with, Physics at COSY, external experiments, theoretical investigations. COSY operation and developments, preparation for FAIR. See hints under the relevant topics. (HSI)

  8. User services in the central library of Juelich Research Center

    Lapp, E.

    1993-01-01

    The central library is a sci/tech special library providing information for the KFA researchers and staff. The library has a large collection of sci/tech materials to meet the information demands of the KFA employees and over 3.000 external users. Among the outside users are students fromthe universities and polytechnics of the region Aachen, Cologne, Duesseldorf, and industry. The library acquires about 8.000 volumes per year and subscribes to 2000 journals. (orig.)

  9. DISMANTLING OF THE FUEL CELL LABORATORY AT RESEARCH CENTRE JUELICH

    Stahn, B.; Matela, K.; Bensch, D.; Ambos, Frank

    2003-01-01

    The fuel cell laboratory was constructed in three phases and taken into operation in the years 1962 to 1966. The last experimental work was carried out in 1996. After all cell internals had been disassembled, the fuel cell laboratory was transferred to shutdown operation in 1997. Three cell complexes, which differed, in particular, by the type of shielding (lead, cast steel, concrete), were available until then for activities at nuclear components. After approval by the regulatory authority, the actual dismantling of the fuel cell laboratory started in March 2000. The BZ I laboratory area consisted of 7 cells with lead shieldings of 100 to 250 mm thickness. This area was dismantled from April to September 2000. Among other things, approx. 30,000 lead bricks with a total weight of approx. 300 Mg were dismantled and disposed of. The BZ III laboratory area essentially consisted of cells with concrete shieldings of 1200 to 1400 mm thickness. The dismantling of this area started in the fir st half of 2001 and was completed in November 2002. Among other things, approx. 900 Mg of concrete was dismantled and disposed of. Since more than 90 % of the dismantled materials was measurable for clearance, various clearance measurement devices were used during dismantling. The BZ II laboratory area essentially consists of cells with cast steel shieldings of 400 to 460 mm thickness. In September 2002 it was decided to continue using this laboratory area for future tasks. The dismantling of the fuel cell laboratory was thus completed. After appropriate refurbishment, the fuel cell laboratory will probably take up operation again in late 2003

  10. The stochastic-cooling system for COSY-Juelich

    Brittner, P.; Danzglock, R.; Hacker, H.U.; Maier, R.; Pfister, U.; Prasuhn, D.; Singer, H.; Spiess, W.; Stockhorst, H.

    1991-01-01

    The cooling in the Cooler Synchrotron COSY will work in the ranges: Band 1: 1 to 1.8 GHz, Band 2: 1.8 to 3 GHz. The system allows cooling in the energy range of 0.8 to 2.5 GeV. The stochastic-cooling system is under development. Cooling characteristics have been calculated. The tanks are similar to those of the CERN-AC. But the COSY parameters have required changes of the tank design. Active RF components have been developed for COSY. Measured results are presented

  11. Forschungszentrum Juelich, Institut fuer Kernphysik/COSY. Annual report 2007

    Buescher, M.; Hanhart, C.; Krewald, S.; Machner, H.; Maier, R.; Meissner, U.G.; Ritman, J.; Stockhorst, H.; Stroeher, H.

    2008-03-01

    The following topics are dealt with, Physics at COSY, external experiments, theoretical investigations. COSY operation and developments, preparation for FAIR. See hints under the relevant topics. (HSI)

  12. Basic lay-out, arrangement and design criteria of heat components of the ''nuclear coal gasification prototype plant (PNP)''

    Pruschek, R.

    1980-01-01

    Since 1975, the companies Bergbau-Forschung GmbH, GHT Gesellschaft fuer Hochtemperaturreaktor-Technik mbH, Hochtemperatur-Reaktorbau GmbH, Kernforschungsanlage Juelich GmbH und Rheinische Braunkohlenwerke AG are working jointly on the Project ''Prototype Plant Nuclear Process Heat (PNP)'', with promotion of the ''Bundesminister fuer Forschung und Technologie'' and of the ''Minister fuer Wirtschaft, Mittelstand und Verkehr des Landes Nordrhein-Westfalen''. The objectives of the project are the development of a high-temperature reactor, with a core outlet temperature of 950 0 C, suitable for various process heat applications, and the development and testing of the appropriate coal gasification technology. The applied gasifications methods comprise endothermal and exothermal reactions. Therefore, various heat transfer components are to be developed. In the context of this Specialists Meeting, only those components will be discussed by which heat is transferred from primary helium to secondary helium or from helium to the working or process fluid

  13. Actinide production in different HTR-fuel cycle concepts

    Filges, D.; Hecker, R.; Mirza, N.; Rueckert, M.

    1978-01-01

    At the 'Institut fuer Reaktorentwicklung der Kernforschungsanlage Juelich' the production of α-activities in the following HTR-OTTO cycle concepts were studied: 1. standard HTR cycle (U-Th); 2. low enriched HTR cycle (U-Pu); 3. near breeder HTR cycle (U-Th); 4. combined system (conventional and near breeder HTR). The production of α-activity in HTR Uranium-Thorium fuel cycles has been investigated and compared with the standard LWR cycles. The production of α-activity in HTR Uranium-Thorium fuel cycles has been investigated and compared with the standard LWR cycles. The calculations were performed by the short depletion code KASCO and the well-known ORIGEN program

  14. Advanced chemical analysis service for elements, radionuclides and phases

    Sansoni, B.

    1986-01-01

    A review is given on the structure, organisation and performance of the chemical analysis service of the Central Department for Chemical Analysis at the Kernforschungsanlage Juelich GmbH. The research and development programs together with the infrastructure of the Centre afford to analyse almost all stable elements of the periodical table in almost any material. The corresponding chemical analysis service has been organized according to a new modular system of analytical steps. According to this, the most complicated and, therefore, most general case of an analytical scheme for element and radionuclide analysis in any type of material can be differentiated into about 14 different steps, the modules. They are more or less independent of the special problem. The laboratory is designed and organized according to these steps. (orig./PW) [de

  15. Tool for the study of matter - the spallation neutron source. Werkzeug zur Erforschung der Materie - die Spallations-Neutronenquelle

    1983-01-01

    It deals with the optimal use of a whole series of matter penetrating radiation types at the construction of a spallation neutron source which the Kernforschungsanlage Juelich will realize in agreement with its associated. This new big science device for the fundamental research in the Federal Republic of Germany shall as the most modern and intense source of neutrons, protons, pions, muons, and neutrinos permits to proceed in the fields of solid state physics, chemistry, molecular biology, intermediate-energy nuclear physics, radiochemistry and radiopharmacology, medicine, and materials science to virgin territory and to provide top research. All interested German groups of researchers and also scientists of foreign countries shall be able to work with this directive big science device.

  16. The local distribution of radiation quality of a collimated fast neutron beam from 15 MeV deuterons on beryllium

    Fidorra, J.; Booz, J.

    1978-01-01

    The local distribution of radiation quality (ysub(F), ysub(D)) of a collimated fast neutron beam from 14 MeV deuterons on Beryllium was studied with a spherical 1/2 inch EG and G proportional counter simulating a diameter of 2μm. The deuterons were accelerated by the compact cyclotron CV-28 of the Kernforschungsanlage Juelich. The collimator was constructed by the Cyclotron Corporation. The mean neutron energy was 6 MeV. The measurements were performed in air and in a water phantom at a target skin distance of 125 cm. The energy deposition spectra of fast neutrons obtained at various positions were separated into three components of different radiation quality: the gamma component, the recoil proton component, and the heavy ion component

  17. The project 'nuclear long-distance energy'

    Harth, R.

    1976-01-01

    The Kernforschungsanlage Juelich is intensively involved in research work with the aim of developing new technological skills for the future supply of energy and to lead the way in industry. In the forefront are a rational utilisation of primary energy and a better adjustment of the energy available, to fulfil requirements. In addition, the supply from nuclear power plants was analysed and a new energy supply system was achieved. It offers the possibility of giving nuclear-produced power to a large proportion of consumers fulfilling their heat and electricity needs, in which the accessible degrees of utilisation lie between 49% and 67%. The project 'nuclear long distance energy' is the theme of a report included in the Congress on Rational Utilisation of Energy, held from 20th to 23rd. september 1976 in Berlin. (orig.) [de

  18. The high-temperature helium test facility (HHV)

    Noack, G.; Weiskopf, H.

    1977-03-01

    The report describes the high-temperature helium test facility (HHV). Construction of this plant was started in 1972 by Messrs. BBC, Mannheim, on behalf of the Kernforschungsanlage Juelich. By the end of 1976, the construction work is in its last stage, so that the plant may start operation early in 1977. First of all, the cycle system and the arrangement of components are dealt with, followed by a discussion of individual components. Here, emphasis is laid on components typical for HHT systems, while conventional components are mentioned without further structural detail. The projected test programme for the HHV facility in phase IB of the HHT project is shortly dealt with. After this, the potential of this test facility with regard to the possible use of test components and to fluid- and thermodynamic boundary conditions is pointed out. With the unique potential the facility offers here, aspects of shortened service life at higher cycle temperatures do not remain disregarded. (orig./UA) [de

  19. Development of a manufacturing process of (Th,U)O2 sintered pellets to be used as nuclear fuel

    Neto Ferreira, R.A.; Santos, A.M. dos; Lameiras, F.S.; Cardoso, P.E.

    1989-01-01

    The R and D result of a reliable manufacturing process of sintered (Th,U)O 2 pellets meeting the operational requirements of pressurized light water nuclear reactors is presented. Available technologies were used as much as possible. The R and D effort was directed to perform the required adaptations. The gel precipitation process was adapted successfully to the specific requirements of direct pressing and sintering. This was done mainly by adjusting the composition of the feed solution. The direct pressing and sintering parameters could be kept almost unchanged in relation to the manufacturing of UO 2 pellets. The design criteria of the (Th,U)O 2 nuclear fuel for pressurized light water reactors were identified and settled in the specification for this fuel. This R and D work was made jointly with the Kernforschungsanlage - Juelich, NUKEM and SIEMENS, Group KWU [pt

  20. Practical tracer investigations of pesticide residues in agricultural ecosystem

    Fuehr, F.

    1984-01-01

    According to the FAO's latest estimates, the world food supply can only be guaranteed if the 1982 agricultural production is increased by approx. 50% by the year 2000. 2/3 of this production increase must be achieved on areas already under cultivation. This means that in addition to balanced mineral fertilization the use of pesticides will have to be intensively continued in order to fully exploit the improved yield potential of the cultivated plants achieved by breeding. The primary research objective is therefore to extend our knowledge of the uptake and effects of pesticides in the plant as well as their persistence in agricultural ecosystems in order to be able to apply them both more efficiently and more safely. The Institute of Radioagronomy at the Kernforschungsanlage Juelich GmbH (Juelich Nuclear Research Centre) is carrying out practical experiments into these problems using 14 C-labelled pesticides under field conditions. In this way statements will become possible on the uptake and residue situation in plants, translocation and metabolism in the soil, the balance in the year of application as well as on the uptake of untreated cultures in the crop rotation. Parallel to this, uptake after leaf spraying or after seed grain treatment is being studied under standardized conditions, as well as for example the mineralization, sorption and fixation of active substances and metabolites in the soil. Results from the past 12 years are being utilized as a basis for an evaluation of the state of knowledge. (orig.)

  1. Nuclear Research Centre Juelich. 1986 annual work report of the Department for Safety and Radiation Protection

    Hille, R.; Frenkler, K.L.

    1986-02-01

    The Department for Safety and Radiation Protection continues to be responsible for coordinating radiation protection, safety and protection at the KFA. It supports the other institutes and departments in performing the safety tasks allotted to them. The principal tasks of the Department are in administrative and technical assistance to these organization units and in safeguards. Administrative assistance involves, for example, regulation of the radiation protection organization in the institutes, including the appointment of radiation protection officers (Strahlenschutzbeauftragte). Furthermore, this includes the central handling of the registration system with the authorities and dealing with outside firms thus considerably relieving the institutes of their administrative tasks. Handling licensing procedures and the central accountancy of radioactive materials is also to be mentioned in this context. Technical assistance largely consists of developing, maintaining and repairing radiation measuring instruments and in the monitoring of personnel by evaluating personnel dosimeters and incorporation controls for radioactive sources. The safeguards tasks of the Department concern the very staff-intensive physical protection, as well as environmental protection and industrial safety. (orig./HP) [de

  2. Nuclear Research Centre Juelich. 1987 annual work report of the Department for Safety and Radiation Protection

    Hille, R.

    1988-03-01

    The Department for Safety and Radiation Protection continues to be responsible for coordinating radiation protection, safety and protection at the KFA. It supports the other institutes and departments in performing the safety tasks allotted to them. The principal tasks of the Department are in administrative and technical assistance to these organization units and in safeguards. Administrative assistance involves, for example, regulation of the radiation protection organization in the institutes, including the appointment of radiation protection officers (Strahlenschutzbeauftragte). Furthermore, this includes the central handling of the registration system with the authorities and dealing with outside firms thus considerably relieving the institutes of their administrative tasks. Handling licensing procedures and the central accountancy of radioactive materials is also to be mentioned in this context. Technical assistance largely consists of developing, maintaining and repairing radiation measuring instruments and in the monitoring of personnel by evaluating personnel dosimeters and incorporation controls for radioactive sources. The safeguards tasks of the Department concern the very staff-intensive physical protection, as well as environmental protection and industrial safety. (orig./HP) [de

  3. Use of cold neutrons for condensed matter research at the neutron guide laboratory ELLA in Juelich

    Schaetzler, R.; Monkenbusch, M.

    1998-01-01

    Cold neutrons produced in the FRJ-2 DIDO reactor are guided into the external hall ELLA. It hosts 10 instruments that are red by three major neutron guides. Cold neutrons allow for diffraction and small angle scattering experiments resolving mesoscopic structures (1 to 100 nm). Contrast variation by isotopic substitution in chemically identical species yields information uniquely accessible bi neutrons. Inelastic scattering of cold neutrons allows investigating slow molecular motions because the low neutron velocity results in large relative velocity changes even at small energy transfers. The SANS machines and the HADAS reflectometer serve as structure probes and the backscattering BSS1 and spin-echo spectrometers NSE as main dynamics probes. Besides this the diffuse scattering instrument DNS and the lattice parameter determination instrument LAP deal mainly with crystals and their defects. Finally the beta-NMR and the EKN position allow for methods other than scattering employing nuclear reactions for solid state physics, chemistry and biology/medicine. (author)

  4. Combined conditioning in the high-temperature experimental nuclear reactor (AVR) at Juelich

    Nieder, R.; Vey, K.; Ivens, G.

    1984-01-01

    The high temperature experimental nuclear reactor (AVR) is the first nuclear power plant in which combined cycle operation has been introduced. The water-steam cycle has been operated for about 15 years according to the alkali method of working with ammonia and hydrazine. The VGB-guidelines have been adhered to througout. Since January 1983 cobined cycle operation has been employed, and in this process a pH-value of about 8.5 and an oxygen concentration of about 200 μg/kg in the feedwater have been used. A distinct reduction of tritium concentration in the water-steam cycle was the outstanding new result. (orig.) [de

  5. Production of hydrogen, nitrogen and argon pellets with the Moscow-Juelich pellet target

    Buescher, M.; Boukharov, A.; Semenov, A.; Gerasimov, A.; Chernetsky, V.; Fedorets, P.

    2009-01-01

    Targets of frozen droplets ("pellets") from various liquefiable gases like H 2 , D 2 , N 2 , Ne, Ar, Kr and Xe are very promising for high luminosity experiments with a 4π detector geometry at storage-rings. High effective target densities (> 10 15 atoms/cm 2 ), a small target size (⊘ ≈ 20–30 μm), a low gas load and a narrow pellet beam are the main advantages of such targets. Pioneering work on pellet targets has been made at Uppsala, Sweden. A next generation target has been built at the IKP of FZJ in collaboration with two institutes (ITEP and MPEI) from Moscow, Russia. It is a prototype for the future pellet target at the PANDA experiment at FAIR/HESR (supported by INTAS 06-1000012-8787, 2007/08) and makes use of a new cooling and liquefaction method, based on cryogenic liquids instead of cooling machines. The main advantages of this method are the vibration-free cooling and the possibility for cryogenic jet production from various gases in a wide range of temperatures. Different regimes of pellet production from H 2 , N 2 and Ar have been observed and their parameters have been measured. For the first time, mono-disperse and satellite-free droplet production was achieved for cryogenic liquids from H 2 , N 2 and Ar. (author)

  6. Irradiation of pressurized water reactor fuel rods in the Forschungsreaktor Juelich 2

    Gaertner, M.

    1978-10-01

    Test fuel rods have been irradiated in FRJ-2 to study the interaction between fuel and cladding as well as hydride orientation stability in the prehydrided cladding. The fuel rods achieved burn-ups of 3.500 to 10.000 MWd/tU at surface temperatures of 333 0 C and power levels up to 620 W/cm. (orig.) [de

  7. Latest developments of neutron scattering instrumentation at the Juelich Centre for Neutron Science

    Ioffe, Alexander

    2013-01-01

    Jülich Centre for Neutron Science (JCNS) is operating a number of world-class neutron scattering instruments situated at the most powerful and advanced neutron sources (FRM II, ILL and SNS) and is continuously undertaking significant efforts in the development and upgrades to keep this instrumentation in line with the continuously changing scientific request. These developments are mostly based upon the latest progress in neutron optics and polarized neutron techniques. For example, the low-Q limit of the suite of small angle-scattering instruments has been extended to 4·10 -5 Å -1 by the successful use of focusing optics. A new generation of correction elements for the neutron spin-echo spectrometer has allowed for the use of the full field integral available, thus pushing further the instrument resolution. A significant progress has been achieved in the developments of 3 He neutron spin filters for purposes of the wide-angle polarization analysis for off-specular reflectometry and (grazing incidence) small-angle neutron scattering, e.g. the on-beam polarization of 3 He in large cells is allowing to achieve a high neutron beam polarization without any degradation in time. The wide Q-range polarization analysis using 3 He neutron spin filters has been implemented for small-angle neutron scattering that lead to the reduction up to 100 times of the intrinsic incoherent background from non-deuterated biological molecules. Also the work on wide-angle XYZ magnetic cavities (Magic PASTIS) will be presented. (author)

  8. On the operating experience of the Doppler Sodar system at the Forschungszentrum Juelich

    Adiga, B.B.; Zeuner, G.

    1990-04-01

    In this report the description and the operating principles of the Doppler Sodar at the KFA are briefly described and outputs from the routine operation of the Sodar are compared with the concurrently measured data on the 120 m high KFA meteorological tower. Three sets of data, varying from periods of ten days to 18 days, are used for the comparison. (orig.)

  9. Evaluation of an interlaboratory comparison of the chemical assay of U, Th, oxide coated particles

    Tamberg, T.; Thiele, D.; Brodda, B.G.

    1981-09-01

    The prototype reactor THTR in Schmehausen (Germany, F.R.) burns a (Th,U)O 2 nuclear fuel using 93% enriched uranium. This material is particularly Safeguards sensitive. It was therefore desirable for the Safeguards Analytical Laboratory (SAL) and other laboratories of the Agency Network to collect experience and test their performance in the analysis of such materials. Support was requested from the ''Joint Programme between the IAEA and the Federal Republic of Germany for the Development of Safeguards Techniques'' to perform, as a first step, an interlaboratory comparison of the chemical assay of U and Th in pyrocarbon-coated BISO-type fuel particles. Such an intercomparison was organized under the auspices of the Institut fuer Chemische Technologie (ICT) of the Kernforschungsanlage Juelich GmbH (KFA). SAL prepared a statistical evaluation of the results which was discussed in Vienna in June 1980. The objective of the project was to define the state of the art in the chemical assay of U-Th fuels and the analytical requirements for the sampling of materials of major interest to Agency Safeguards at present

  10. Papers about coated particles, graphitic and metallic materials for progressive high-temperature reactors at the Reactor Meeting 1978

    Rottmann, J.

    1978-09-01

    In the contributions, questions on the development, the radiation and the high-temperature behaviour and the characterization of fuel element particles are treated. Furthermore the resistance and radiation behaviour of graphitic materials are discussed. Finally, questions on the choice of high-temperature alloys for nuclear process heat facilities are discussed and the testing-equipment of the Nuclear Research Centre as well as first results of the long-time experiments are presented. The work was performed within the frame of the projects 'HTR-Fuel Element Cycle' and 'Prototype Nuclear Process Heat', which are sponsored by the Federal Ministry of Research and Technology of the Federal Republic of Germany and of the state of North-Rhine-Westfalia. Partner firms, who participate in the two projects are Gelsenberg AG, Gesellschaft fuer Hochtemperaturreaktor-Technik mbH, Hochtemperaturreaktor-Brennelement GmbH, Hochtemperatur-Reaktorbau GmbH, Kernforschungsanlage Juelich GmbH, NUKEM GmbH, SIGRI Elektrographit GmbH/Ringsdorff-Werke GmbH, Bergbauforschung GmbH und Rheinische Braunkohlenwerke AG. (orig./UA) [de

  11. Science for power and the market

    Eckert, M.; Osietzki, M.

    1989-01-01

    Nuclear research and microelectronics rank foremost in importance in recent federal German technology history. So far unpublished documentary materials are made use of by the authors to demonstrate how both these technology sectors have increasingly been governed by economic, military, and political interests. The first approach to nuclear technology is represented by the purchase of the first research reactor, called 'atom egg', from the USA and the planning phase for the Kernforschungsanlage Juelich. The early history of particle accelerators and the beginning of fusion research offer insight into two areas corollary to nuclear research. The chapter on microelectronics is concerned with the beginnings of semi-conductor research at Siemens, the marketing of the first self-fabricated and fully transistorized computer in the Federal Repbulic of Germany, and solid-state physics, the science behind microelectronics. The emphasis is on the linking of scientific output to political and economic needs and aims. For instance, the accelerator development initially was a technology which the military hoped would yield a new weapon and industry hoped could be profitably exploited in the medical sector. In this situation of favour with the powers that be and the market, the scientists involved created a 'research front' that earned them high prestige. A similar case is the 'atom egg', which established nuclear researchers as the new elite in the field where science and politics are contiguous to each other. Microelectronics quickly followed suit in this respect. (orig./HP) [de

  12. Research in experimental nuclear physics. Progress report, 1 April 1984-31 March 1985

    1984-11-01

    This report summarizes the work carried out by personnel from the University of Texas at Austin at the Los Alamos Clinton P. Anderson Meson Physics Facility (LAMPF) during the calendar year 1984. The research activities involved experiments done with the Energetic Pion Channel and Spectrometer (EPICS), the High Resolution Spectrometer (HRS), and some work has been done at Argonne National Laboratory and Kernforschungsanlage, Juelich, West Germany. A brief overview of work supported by this contract, a list of abstracts of papers reported at scientific meetings, and a list of published papers and preprints are given. These papers summarize experiments undertaken this year and in the proceeding year and indicate the work accomplished by the participants in this program of medium energy nuclear physics research. Studies include parameters of the neutron density distributions for the Ca isotopes for the analysis of π +- elastic scattering, the excitation of ΔS = 1 transitions via pion inelastic scattering in light nuclei, 12 C(π + ,π + ') inelastic scattering at very small angles, pion-induced double charge exchange reaction, and evidence for the population of a low-spin Δ-hole state at 248 MeV was found in 12 C via 13 C(p,d) 12 C* at 800 MeV

  13. The FRJ 1 reactor (MERLIN) at Juelich, F.R. Germany and associated hot cell facilities. Information sheets

    Hardt, P. von der; Roettger, H.

    1981-01-01

    Technical information is given on the FRJ 1 reactor and associated hot cell facilities, with the main emphasis on experimental irradiation facilities, specialized irradiation devices (loops and capsules) and possibilities for post-irradiation examinations of samples. The information is presented in the form of eight information sheets under the headings: main characteristics of the reactor; utilization and specialization of the reactor; experimental facilities; neutron spectra; main characteristics of specialized irradiation devices; main characteristics of hot cell facilities; equipment and techniques available for post-irradiation examinations; utilization and specialization of the hot cell facilities

  14. The use of non-destructive testing in COSY, an ultrahigh vacuum research plant of KFA, Juelich

    Schroeder, G.; Pauly, F.; Stechemesser, H.

    1993-01-01

    This report shows that the development, the construction and the later successful operation of ultra-high vacuum (UHV) plants in the pressure range of ≤ 10 -10 mbar is not possible without the use of highly sensitive non-destructive testing. Using the example of the large scale precision plant COSY, it is shown that only by observing basic UHV manufacturing conditions and the thorough use of the helium leak-finding technique and mass-spectrometric residual gas analysis can the required leakage rates ( -10 mbar. 1 . s -1 ) and surface cleanliness be achieved. (orig.) [de

  15. The Brazilian fuel substitution dilemma: Recent experience from an energy supply study

    Aringhoff, R.

    1984-01-01

    The paper is intended as a basis for discussing strategic supply options and their economic impacts for an advanced developing country. It represents a first brief assessment of an energy systems analysis project which was carried out by the Secretaria de Tecnologia do Ministerio das Minas e Energia and Kernforschungsanlage Juelich between May 1982 and May 1984. In view of the fact that Brazil had to spend 50% of its annual export revenues to import oil in 1980 and taking into account that this import bill of roughly US $10x10 9 affects the balance of payments and foreign debt burden significantly, the Brazilian Ministry of Energy and Mines decided to evaluate the consequences of alternative supply strategies utilizing domestic energy resources with priority. There is a big challenge and opportunity to develop and utilize domestic energy resources, mainly hydropower, coal for thermal uses in industry and biomass for the rural and residential sectors. Supplying the Brazilian energy system in general will not be the problem. The oil substitution dilemma becomes obvious when one looks at the specific requirements of the transport sector. For historical reasons the transport system is nearly totally based on road transport. Around two thirds of the total fuel consumption is swallowed up by this sector. Replacing crude oil means replacing gasoline and diesel. This means producing ethanol from sugar-cane and methanol from hard coal. These alternatives are leading to a significantly higher overall system cost of the energy system. The efforts of the Brazilian Government to replace imported fuel oil and ensure a self-sufficient domestic energy supply of high security were financed until now by a significant public budget deficit. This strategy will run into difficulties in the future, as the latest IMF negotiations show. One way to escape this dilemma can be a careful examination of ways to reconstruct the transport system. (author)

  16. Test of the core design methods for the THTR 300 with experimental results from the critical facility KAHTER

    Hofmann, K.; Huebner, A.; Brandes, S.; Krings, F.

    1974-10-15

    At the Kernforschungsanlage Juelich, core physics experiments with core 1 and core 2 of the critical facility for high temperature reactors KAHTER were carried out in 1973. Core 2 corresponds to the THTR initial core in its moderation ratio S = 7500. Selected experimental results on the critical mass, on control rod worths, and reaction rate distributions were used for testing the most important procedures for the THTR core physics design. The zero-dimensional spectrum program MUPO with its cross section library and the and neutron flux calculations in two-dimensional diffusion approximation by CRAM are of central importance. It proved to be important to introduce modifications specific to the KAHTER plant into the standard models. Thus the void effect (void above the pebble bed) was investigated with DOT-2 by transport theory and a correction was introduced for the critical masses calculated by diffusion theory. Another feature already contained in the standard procedure, the increase of the diffusion constants for the hollow spaces between the spheres, results in a correction of 3.8% < delta-k for KAHTER, whereas in the THTR 300 it only amounts to several tenths % delta-k. Critical masses are predicted with accuracies of < 1.5 % or with regard to reactivity < 0.65 % delta-k. The calculated values for the radial neutron flux distributions deviate from the measured values in the core area by approximately lo %. In the case of the axial profiles, deviations are observed at the pebble bed surface which can be explained by the upper void, which cannot be satisfactorily represented by the diffusion theory. Control rod worths are predicted quite well, i.e., to within +/- 5%. An exception is the bank of 4 reflector rods, where the applied model of the "grey curtain" is not accurate because of the large distances between rods. The calculated control rod worths for that case were found to be too low, which does, however, not result in a safety problem.

  17. Demolition of the FRJ-1 research reactor (MERLIN); Abbau des Reaktorblocks des Forschungsreaktors FRJ-1 (MERLIN)

    Stahn, B.; Matela, K.; Zehbe, C. [Forschungszentrum Juelich GmbH (Germany); Poeppinghaus, J. [Gesellschaft fuer Nuklearservice, Essen (Germany); Cremer, J. [SNT Siempelkamp Nukleartechnik, Heidelberg (Germany)

    2003-06-01

    FRJ-2 (MERLIN), the swimming pool reactor cooled and moderated by light water, was built at the then Juelich Nuclear Research Establishment (KFA) between 1958 and 1962. In the period between 1964 and 1985, it was used for. The reactor was decommissioned in 1985. Since 1996, most of the demolition work has been carried out under the leadership of a project team. The complete secondary cooling system was removed by late 1998. After the cooling loops and experimental installations had been taken out, the reactor vessel internals were removed in 2000 after the water had been drained from the reactor vessel. After the competent authority had granted a license, demolition of the reactor block, the central part of the research reactor, was begun in October 2001. In a first step, the reactor operating floor and the reactor attachment structures were removed by the GNS/SNT consortium charged with overall planning and execution of the job. This phase gave rise to approx. The reactor block proper is dismantled in a number of steps. A variety of proven cutting techniques are used for this purpose. Demolition of the reactor block is to be completed in the first half of 2003. (orig.) [German] Der mit Leichtwasser gekuehlte und moderierte Schwimmbad-Forschungsreaktor FRJ-2 (MERLIN) wurde von 1958 bis 1962 fuer die damalige Kernforschungsanlage Juelich (KFA) errichtet. Von 1964 bis 1985 wurde er fuer Experimente mit zunaechst 5 MW und spaeter 10 MW thermischer Leistung bei einem maximalen thermischen Neutronenfluss von 1,1.10{sup 14} n/cm{sup 2}s genutzt. Im Jahr 1985 stellte der Reaktor seinen Betrieb ein. Die Brennelemente wurden aus der Anlage entfernt und in die USA und nach Grossbritannien verbracht. Seit 1996 erfolgen die wesentlichen Abbautaetigkeiten unter Leitung eines verantwortlichen Projektteams. Bis Ende 1998 wurde das komplette Sekundaerkuehlsystem entfernt. Dem Abbau der Kuehlkreislaeufe und Experimentiereinrichtungen folgte im Jahr 2000 der Ausbau der

  18. Neutron scattering. Lectures of the JCNS laboratory course held at Forschungszentrum Juelich and the research reactor FRM II of TU Munich

    Brueckel, T.; Heger, G.; Richter, D.; Zorn, R.

    2007-01-01

    The following topics are dealt with: Fourier transform, basic assumptions of quantum mechanics and the Born approximation, symmtery in crystals, neutron sources, neutron elastic scattering and properties, polarized neutron scattering, correlation functions measured by scattering experiments, grazing incidence neutron scattering, neutron diffractometers, small-angle scattewring inelastic crystal spectrometers, time-of-flight spectrometers using NSE, structure determination, inelastic neutron scattering with phonon and magnon excitations, structure of complex fluids and macromolecules, polymer dynamics, magnetism. (HSI)

  19. Visit to the 2nd International seminar on quality control of radioactive waste packaged for removal; Juelich, 28/5-1/6 1990

    Boekschoten, H.J.C.; Tanke, R.H.J.

    1990-01-01

    An account is presented of a five-day seminar on the quality control of radioactive waste contained for removal. In a number of countries a control system is raised. Such a control system can be subdivided in two large parts: -the system of rules, organization (responsibilities) and financing, -the control upon these. Because of the many kinds of radio-active waste, treatment methods and various removal possibilities and because everything has to be accounted well, a quality control system elaborated in detail may involve large costs. It has been mentioned that the costs for processing and removal could be enlarged with 20 - 30 % (BRD). During the seminar attention has been paid to national programmes, the raising of quality control systems, the quality assurance of products of treatment products and the containment of those products, certification of storage and removal sites, experiences with quality control systems, inspection of offered waste. (author)

  20. Decay heat removal and heat transfer under normal and accident conditions in gas cooled reactors. Proceedings of a specialists meeting held in Juelich, Germany, 6-8 July 1992

    1994-08-15

    The meeting was convened by the International Atomic Energy Agency on the recommendation of the IAEA`s International Working Group on Gas Cooled Reactors. It was attended by participants from China, France, Germany, Japan, Poland, the Russian Federation, Switzerland, the United Kingdom and the United States of America. The meeting was chaired by Prof. Dr. K. Kugeler and Prof. Dr. E. Hicken, Directors of the Institute for Safety Research Technology of the KFA Research Center, and covered the following: Design and licensing requirements for gas cooled reactors; concepts for decay heat removal in modern gas cooled reactors; analytical methods for predictions of thermal response, accuracy of predictions; experimental data for validation of predictive methods - operational experience from gas cooled reactors and experimental data from test facilities. Refs, figs and tabs.

  1. Development of X-Y multiwire proportional chamber (MWPC) for the magnetic spectrograph 'BIG KARL' of the Juelich cyclotron 'JULIC' and investigation of the reaction 12C(α,α1)12C with Eα=145 MeV

    Koehler, M.

    1978-07-01

    The paper reports on the concept and development of a spatial-resolution X-Y detector for the magnetic spectrograph BIG KARL, on test measurements on the 300 mm x 40 mm prototype with a 90 Sr β source, and on the first few in-beam measurements. The reaction 12 C(α,α') 12 C with Esub(α) = 145 MeV was investigated under extreme forward angles thetasub(LAB) = 6.0 0 to 1.5 0 . (orig./WL) 891 WL [de

  2. Physical and chemical characterization of the (Th, U)O2 mixed oxide fuel

    Santos, A.M.M. dos; Avelar, M.M.; Palmieri, H.E.L.; Lameiras, F.S.; Ferreira, R.A.N.

    1986-01-01

    The NUCLEBRAS R and D Center (Centro de Desenvolvimento da Tecnologia Nuclear - CDTN) has been performing, together with german institutions (Kernforschungsanlage Julich GmbH - KFA, Krafwerk Union A.G. - KWU and NUKEM GmbH), a program for utilization of thorium in pressurized water reactors. In this paper are presented the physical and chemical characterizations necessary to quality the (Th, U)O 2 fuel and the respective methods. (Author) [pt

  3. Physics and chemistry of fission

    1979-01-01

    Full text: In the pleasant and hospitable atmosphere of the Kernforschungsanlage Juelich in the Federal Republic of Germany, the IAEA symposium on the Physics and Chemistry of Fission took place. Almost 200 scientists attended, 154 abstracts were submitted, and 57 papers presented, but more important than the numbers was the quality of the contributions and the progress reported at the symposium. The neutron was discovered almost 50 years ago; 40 years ago the idea of nuclear fission was born. Since then, a number of laboratories have worked hard to explain the phenomenon of fission One would expect that by now scientists would know exactly what happens in a nucleus before and during the process of fission, particularly as there are hundreds of power and research reactors in operation, and fission of uranium isotopes is the basis of their functioning. At first glance, fission seems a simple process: a neutron hits and penetrates the uranium nucleus which becomes excited, i.e. has a surplus of energy. One way to get rid of this energy is for the nucleus to split into two parts; additional products of this process are energy and more neutrons. Nature, however, seems to dislike such straightforward explanations. In the case of fission, scientists have observed a number of phenomena which disagree with a simple model. Sometimes, a nucleus will split into two parts without being 'attacked' by a neutron; this spontaneous fission opens up a new line of fission research and several contributions at the symposium reported on sophisticated experiments designed to unravel some of its specific details. Sometimes, a fissioning nucleus will emit another particle: ternary fission has become a powerful tool for studying the properties of nuclei during the fission process. For the scientist, it is fascinating to observe how the nucleus behaves during fission. They invent models which are supposed to reproduce the most probable course of events leading to fission. In one of these

  4. Neutron scattering at FRJ-2. Experimental reports 2004

    Brueckel, T.; Richter, D.; Zorn, R.

    2004-01-01

    The Research Centre FZ-Juelich is offering its neutron research facilities to a growing national and international user community for the benefit of their research using neutron beams. FZ-Juelich operates a 23 MW DIDO reactor that delivers a total neutron flux of 2.9 x 10 14 n/cm 2 s (undisturbed) for a comprehensive suite of 17 instruments installed at 5 individual thermal beam tubes and, in addition, 5 external cold neutron guides. In the year 2004 the reactor was in operation for 208 days and we are happy to announce that more than 150 individual experiments (constituting 61% of the total) were carried out by a large external user community from 85 institutions all over the world. In close collaboration with internal staff the study of soft matter systems took the largest stake. In addition, subjects of biology, magnetism and engineering were among the other main topics of the experimental programme. We gratefully acknowledge the funding programme ''Juelich Neutrons for Europe'' under the European initiative NMI3 that enables numerous external users from the EU and associated countries to come over, visit Juelich and perform their experiments. This book comprises the scientific reports of the experiments completed in 2004. We wish to thank all external users, local applicants, instrument responsibles, and technical staff for their joint efforts and contributions to the success and progress of the Juelich neutron research facility. (orig.)

  5. 10 years of current generation in the AVR reactor. The high-temperature pebble-bed reactor - a hot tip for our future

    Schenk, P [Arbeitsgemeinschaft Versuchs-Reaktor G.m.b.H., Juelich (Germany, F.R.); A G, Stadtwerke Duesseldorf [Germany, F.R.; Vereinigung Deutscher Elektrizitaetswerke e.V. (VDEW), Frankfurt am Main (Germany, F.R.)); Nehrling, H [Ministerium fuer Wirtschaft, Mittelstand und Verkehr des Landes Nordrhein-Westfalen, Duesseldorf (Germany, F.R.); Daeunert, U [Bundesministerium fuer Forschung und Technologie, Bonn-Bad Godesberg (Germany, F.R.); Schulten, R [Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Reaktorentwicklung; Mattick, W [Brown, Boveri und Cie A.G., Mannheim (Germany, F.R.)

    1978-02-01

    On 17th December 1967, the experimental nuclear power plant (AVR) in Juelich supplied RWE network with power for the first time. With the start of the power operation of the first German high-temperature reactor (HTR), a milestone was reached in the development of this new and progressive line of construction. On the same day exactly 10 years later, the successful work with the hottest nuclear reactor in the world was reviewed in the presence of 15 associates of the Arbeitsgemeinschaft Versuchsreaktor (AVR) Ltd. and the personnel of the experimental nuclear power plant at a festival event in the main auditorium of the nuclear power plant at Juelich before some 300 guests from central and local government, the board of control, representatives of the population of the Dueren area and the town of Juelich, as well as bodies of the power producing industry.

  6. 10 years of current generation in the AVR reactor

    Schenk, P.; Nehrling, H.; Daeunert, U.; Schulten, R.

    1978-01-01

    On 17th December 1967, the experimental nuclear power plant (AVR) in Juelich supplied RWE network with power for the first time. With the start of the power operation of the first German high-temperature reactor (HTR), a milestone was reached in the development of this new and progressive line of construction. On the same day exactly 10 years later, the successful work with the hottest nuclear reactor in the world was reviewed in the presence of 15 associates of the Arbeitsgemeinschaft Versuchsreaktor (AVR) Ltd. and the personnel of the experimental nuclear power plant at a festival event in the main auditorium of the nuclear power plant at Juelich before some 300 guests from central and local government, the board of control, representatives of the population of the Dueren area and the town of Juelich, as well as bodies of the power producing industry. (orig.) [de

  7. Innovative electron-beam welding of high-melting metals

    Behr, W.; Reisgen, U.

    2007-01-01

    Since its establishment as nuclear research plant Juelich in the year 1956, the research centre Juelich (FZJ) is concerned with the material processing of special metals. Among those are, above all, the high-melting refractory metals niobium, molybdenum and tungsten. Electron beam welding has always been considered to be an innovative special welding method; in the FZJ, electron beam welding has, moreover, always been adapted to the increasing demands made by research partners and involved manufacturing and design sectors. From the manual equipment technology right up to highly modern multi-beam technique, the technically feasible for fundamental research has, this way, always been realised. (Abstract Copyright [2007], Wiley Periodicals, Inc.) [de

  8. The forward detector of the ANKE spectrometer. Tracking system and its use in data analysis

    Dymov, S.; Erven, W.; Kacharava, A.

    2004-01-01

    The tracking system of the forward detector of the ANKE magnetic spectrometer at the internal beam of the accelerator COSY (Juelich, Germany) is described. Data analysis procedures, including track search and momentum reconstruction, are presented, and the performance of the tracking system is illustrated with the use of experimental data

  9. Measurements in CESAR on the cold pebble bed experiments. Interpretation of fine structure and absorber rod measurements

    Scherer, W; Hecker, R; Kirch, N; Krings, F; Neef, R D; Langlet, G

    1973-10-15

    In the framework of a cooperation between KFA-Juelich and CEA France in 1972 a critical HTR-experiment with spherical fuel elements has been performed in the critical facility CESAR at CEN Cadarache. The experiments were done in order to test the validity of several computer codes in the field of nuclear design of HTR power plants.

  10. Fast methods for long-range interactions in complex systems. Lecture notes

    Sutmann, Godehard; Gibbon, Paul; Lippert, Thomas

    2011-01-01

    Parallel computing and computer simulations of complex particle systems including charges have an ever increasing impact in a broad range of fields in the physical sciences, e.g. in astrophysics, statistical physics, plasma physics, material sciences, physical chemistry, and biophysics. The present summer school, funded by the German Heraeus-Foundation, took place at the Juelich Supercomputing Centre from 6 - 10 September 2010. The focus was on providing an introduction and overview over different methods, algorithms and new trends for the computational treatment of long-range interactions in particle systems. The Lecture Notes contain an introduction into particle simulation, as well as five different fast methods, i.e. the Fast Multipole Method, Barnes-Hut Tree Method, Multigrid, FFT based methods, and Fast Summation using the non-equidistant FFT. In addition to introducing the methods, efficient parallelization of the methods is presented in detail. This publication was edited at the Juelich Supercomputing Centre (JSC) which is an integral part of the Institute for Advanced Simulation (IAS). The IAS combines the Juelich simulation sciences and the supercomputer facility in one organizational unit. It includes those parts of the scientific institutes at Forschungszentrum Juelich which use simulation on supercomputers as their main research methodology. (orig.)

  11. Fast methods for long-range interactions in complex systems. Lecture notes

    Sutmann, Godehard; Gibbon, Paul; Lippert, Thomas (eds.)

    2011-10-13

    Parallel computing and computer simulations of complex particle systems including charges have an ever increasing impact in a broad range of fields in the physical sciences, e.g. in astrophysics, statistical physics, plasma physics, material sciences, physical chemistry, and biophysics. The present summer school, funded by the German Heraeus-Foundation, took place at the Juelich Supercomputing Centre from 6 - 10 September 2010. The focus was on providing an introduction and overview over different methods, algorithms and new trends for the computational treatment of long-range interactions in particle systems. The Lecture Notes contain an introduction into particle simulation, as well as five different fast methods, i.e. the Fast Multipole Method, Barnes-Hut Tree Method, Multigrid, FFT based methods, and Fast Summation using the non-equidistant FFT. In addition to introducing the methods, efficient parallelization of the methods is presented in detail. This publication was edited at the Juelich Supercomputing Centre (JSC) which is an integral part of the Institute for Advanced Simulation (IAS). The IAS combines the Juelich simulation sciences and the supercomputer facility in one organizational unit. It includes those parts of the scientific institutes at Forschungszentrum Juelich which use simulation on supercomputers as their main research methodology. (orig.)

  12. Benefits and hazards of nuclear power

    Barnert, H.; Borsch, P.; Feldmann, A.; Merz, E.; Muench, E.; Oesterwind, D.; Voss, A.; Wolters, J.

    1979-09-01

    Compilation of a seminar at the KFA Juelich on topical problems of nuclear power. Subjects: Energy demand, its expected development and possibilities of coverage; physical fundamentals and technical realisation of power generation by nuclear fission; fuel cycle problems and solutions; effects of radioactive radiation; safety of nuclear power plants and the nuclear hazard as compared with other hazards. (orig./RW) [de

  13. An airship for the research. A zeppelin flies in scientific mission for the climate research over southern and northern Europe; Ein Luftschiff fuer die Forschung

    Anon.

    2012-07-01

    In may 2012 the hitherto greatest scientific mission of a NT zeppelin starts. The Juelich institute for energy and climate research (IEK-8) coordinates thereby the numerous experiments aboard. The special: Especially for the research the ZLT Zeppelin Luftschifftechnik in Friedrichshafen builds a new airship.

  14. Preliminary design analysis of the ALT-II limiter for TEXTOR

    Koski, J.A.; Boyd, R.D.; Kempka, S.M.; Romig, A.D. Jr.; Smith, M.F.; Watson, R.D.; Whitley, J.B.; Conn, R.W.; Grotz, S.P.

    1983-01-01

    Installation of a large toroidal belt pump limiter, Advanced Limiter Test II (ALT-II), on the TEXTOR tokamak at Juelich, FRG is anticipated for early 1986. This paper discusses the preliminary mechanical design and materials considerations undertaken as part of the feasibility study phase for ALT-II

  15. Study of the production of heavy Λ hypernuclei in the (p,, K+) reaction below the N-N threshold and of their decay

    Schult, O.W.B.; Borgs, W.; Gotta, D.; Hamacher, A.; Koch, H.R.; Ohm, H.; Riepe, R.; Seyfarth, H.; Sistemich, K.; Drueke, V.; Filges, D.; Jarczyk, L.; Kistryn, S.; Smyrski, J.; Strzalkowski, A.; Styczen, B.; Brentano, P. von

    1991-01-01

    An experiment is briefly described which we are preparing for the study of heavy Λ hypernuclei, their formation in the (p, K + ) reaction, their Λ decay half life and other Λ decay features. The planned recoil shadow measurement of fission fragments is expected to yield the required background discrimination. The experiment uses the unique features of COSY-Juelich

  16. ENSTAR detector for η-mesic studies

    We have initiated a search for a new type of nuclear matter, the -mesic nucleus, using beams from the multi-GeV hadron facility, COSY at Juelich, Germany. A large acceptance ... The layers are used to generate - spectra for particle identification and total energy information of stopped particles. The granularity of the ...

  17. Contributions for the seventeenth biennial conference on carbon

    Delle, W.

    1985-06-01

    This report is the compilation of the papers prepared by KFA Juelich GmbH for the 17th Biennial Conference on Carbon. In the contributions, results are presented which were obtained from the application of carbon in the High Temperature Gas-Cooled Reactor and for the Spallation Neutron Source planned in the Federal Republic of Germany. (orig.) [de

  18. International workshop on calorimeter simulation

    Filges, D.; Cloth, P.

    1988-10-01

    The aim of the Juelich workshop was to provide an overview of the state of calorimeter simulation and the methods used. This resulted in 29 contributions to the following topics: Code systems relevant to calorimeter simulation, vectorization and code speed-up, simulation of calorimeter experiments, special applications of calorimeter simulation. This report presents the viewgraphs of the given talks. (orig./HSI)

  19. IN15 ultra-high-resolution spin-echo project. First experiment

    Schleger, P; Hayes, C [Institut Max von Laue - Paul Langevin (ILL), 38 - Grenoble (France); Kollmar, A [Forschungszentrum Juelich GmbH (Germany)

    1997-04-01

    The IN15 project is a collaboration between the ILL, HMI (Berlin), and FZ (Juelich) to construct a spin-echo spectrometer with a fourier time-range surpassing half a microsecond. Three different operational modes are possible: normal, with neutron focusing, and time-of-flight. Present status of the project is described. (author). 3 refs.

  20. Research report 1976. Pt. 2

    1976-01-01

    The research report describes the work of the faculties of Bochum university in 1976, the so-called 'overlapping institutes' and the special research sectors 'biological signal reception and processing', ('Bionach'), 'plasma physics Bochum/Juelich', and the institute for development research and policies. (HK) [de

  1. The Nijmegen hyperon-nucleon potentials

    Timmermans, R.

    1994-01-01

    The Nijmegen YN potential models are reviewed. Differences with the models constructed by the Juelich group are highlighted. A mini- review is given of the status of the scalar mesons and their relevance for the NN and YN interactions. Finally, the reactions bar NN → bar YY are discussed

  2. The legacy of the experimental hadron physics programme at COSY

    Wilkin, C. [UCL, Physics and Astronomy Department, London (United Kingdom)

    2017-06-15

    The experimental hadronic physics programme at the COoler SYnchrotron of the Forschungszentrum Juelich terminated at the end of 2014. After describing the accelerator and the associated facilities, a review is presented of the major achievements in the field realized over the twenty years of intense research activity. (orig.)

  3. Research report 1976. Pt. 1

    1976-01-01

    The research report describes the work of the faculties of Bochum university in 1976, the so-called 'overlapping institutes' and the special research sectors 'biological signal reception and processing', ('Bionach'), 'plasma physics Bochum/Juelich', and the insitute for development research and policies. (HK) [de

  4. Results of Cesar II critical facility with low enriched fuel balls

    Langlet, G; Guerange, J; Laponche, B; Morier, F; Neef, R D; Bock, H J; Kring, F J; Scherer, W

    1972-06-15

    The Cesar facility has been transformed to load in its center a pebble bed fuel. This new Cesar assembly is called Cesar II. The program for the measurements with HTR type fuel balls is managed under a cooperation between physicists of CEA/CADARACHE and KFA/JUELICH. A description of the measuring zones of Cesar II and of the experimental results is given.

  5. Reasons of an experimental effort for pebble bed reactors. A program of measurements in the CESAR reactor at Cadarache

    Scherer, W; Bock, H J; Krings, F; Neef, R D; Langlet, G; Dixmier, M; Laponche, B; Morier, F

    1972-06-15

    An extended experimental program on neutron physics of HTR fuel balls is being performed in the graphite moderated critical faclity CESAR at CEN Cadarache (France). The experiments are done in the frame of a cooperation between KFA Juelich and CEA Cadarache.

  6. A PC-program for the calculation of neutron flux and element contents using the ki-method of neutron activation analysis

    Boulyga, E.G.; Boulyga, S.F.

    2000-01-01

    A computer program is described, which calculates the induced activities of isotopes after irradiation in a known neutron field, thermal and epithermal neutron fluxes from the measured induced activities and from nuclear data of 2-4 monitor nuclides as well as the element concentrations in samples irradiated together with the monitors. The program was developed for operation in Windows 3.1 (or higher). The application of the program for neutron activation analysis allows to simplify the experimental procedure and to reduce the time. The program was tested by measuring different types of standard reference materials at the FRJ-2 (Research Centre, Juelich, Germany) and Triga (University Mainz, Germany) reactors. Comparison of neutron flux parameters calculated by this program with those calculated by a VAX program developed at the Research Centre, Juelich was done. The results of testing seem to be satisfactory. (author)

  7. Comparative analysis of three atmospheric dispersion coefficient systems at the Angra dos Reis, RJ, region; Analise comparativa de tres sistemas de coeficientes de dispersao atmosferica na regiao de Angra dos Reis, RJ

    Biagio, Rosa Maria de Souza

    1982-07-01

    A comparative analysis was made in this work among Pasquill-Gifford (PG) atmospheric dispersion coefficients and those determined at the Juelich and Karlsruhe sites with the purpose of suggesting which one would be the most applicable to the Angra site. Each one of the three systems was determined by different experiments, carried out over sites with diversified features. The systems of Juelich and Karlsruhe were obtained over sites with high surface roughness and from stacks (elevated releases), while the PG system was obtained over sites with a small surface roughness and from ground level releases. The results of the application of these systems at a complex site like Angra,which has a highly diversified structure encompassing sea, vegetation, predominance of light winds and stable stability classes, show that the PG system, the most used in the world, is still the best choice. (author)

  8. Determination of the deposition of polycyclic aromatic hydrocarbons (PAHs) to soil at Scheyern and Kirchheim near Munich; Bestimmung der Eintraege von polyzyklischen aromatischen Kohlenwasserstoffen (PAHs) an den Standorten Scheyern und Kirchheim bei Muenchen

    Krainz, A; Wiedenmann, M; Maguhn, J [GSF-Forschungszentrum fuer Umwelt und Gesundheit Neuherberg (Germany). Inst. fuer Oekologische Chemie

    1998-12-31

    Task force 1, ``Analysis of the exposure of soils``, carried out comprehensive and site-specific measurements of the transfer of environmental chemicals into soil by means of the example of s-triazines and polycyclic aromatic hydrocarbons (PAHs). This work was in four parts: a: Determination of PAH nuisance concentrations in selected sites (Juelich, Scheyern, Bad Lauchstaedt); b: Measurement of wet deposition, development and use of methods for the determination of dry deposition; c: Statements regarding large-area PAH transfer into soil in Germany; d: Modelling of the rates of dry deposition. (orig.) [Deutsch] Aufgabe der Arbeitsgruppe 1 `Belastungsanalyse von Boeden`: Flaechendeckende sowie standortbezogene Erfassung der Eintraege von Umweltchemikalien am Beispiel der s-Triazine und PAHs. a: Bestimmung der Immissionskonzentrationen von PAHs an den Schwerpunktstandorten (Juelich, Scheyern, Bad Lauchstaedt) b: Messung der Nassen Deposition, Entwicklung und Anwendung von Methoden zur Bestimmung der Trockenen Deposition c: Aussagen ueber flaechendeckende Eintraege von PAHs in der Bundesrepublik d: Modellierung der Trockendepositionsraten. (orig.)

  9. Determination of the deposition of polycyclic aromatic hydrocarbons (PAHs) to soil at Scheyern and Kirchheim near Munich; Bestimmung der Eintraege von polyzyklischen aromatischen Kohlenwasserstoffen (PAHs) an den Standorten Scheyern und Kirchheim bei Muenchen

    Krainz, A.; Wiedenmann, M.; Maguhn, J. [GSF-Forschungszentrum fuer Umwelt und Gesundheit Neuherberg (Germany). Inst. fuer Oekologische Chemie

    1997-12-31

    Task force 1, ``Analysis of the exposure of soils``, carried out comprehensive and site-specific measurements of the transfer of environmental chemicals into soil by means of the example of s-triazines and polycyclic aromatic hydrocarbons (PAHs). This work was in four parts: a: Determination of PAH nuisance concentrations in selected sites (Juelich, Scheyern, Bad Lauchstaedt); b: Measurement of wet deposition, development and use of methods for the determination of dry deposition; c: Statements regarding large-area PAH transfer into soil in Germany; d: Modelling of the rates of dry deposition. (orig.) [Deutsch] Aufgabe der Arbeitsgruppe 1 `Belastungsanalyse von Boeden`: Flaechendeckende sowie standortbezogene Erfassung der Eintraege von Umweltchemikalien am Beispiel der s-Triazine und PAHs. a: Bestimmung der Immissionskonzentrationen von PAHs an den Schwerpunktstandorten (Juelich, Scheyern, Bad Lauchstaedt) b: Messung der Nassen Deposition, Entwicklung und Anwendung von Methoden zur Bestimmung der Trockenen Deposition c: Aussagen ueber flaechendeckende Eintraege von PAHs in der Bundesrepublik d: Modellierung der Trockendepositionsraten. (orig.)

  10. Conceptual design of a cold methane moderator system for the European Spallation Source (ESS)

    Barnert-Wiemer, H

    2002-01-01

    As part of the work for the target station of the planned European spallation source (ESS) the Central Department of Technology at the Forschungszentrum Juelich GmbH is also concerned with the moderators, particular attention being given to the development of cold methane moderators. This report discusses the technical feasibility of solid methane moderators. Methods to tailor the neutron output by adding absorption materials (decouplers or poisons) are not considered here, neither are composite moderators. Based on the given target-moderator-reflector assembly of the ESS project a concept for the ESS cold methane moderators has been developed and is being examined at the Forschungszentrum Juelich. According to this moderator concept the moderator is a fixed bed of small spheres, which makes moderator container filling homogeneous and reproducible. Since spheres form a defined packed bed, cooling of the moderator bed by H sub 2 is reliable. The process of filling the moderator container and of removing the pe...

  11. Comparative analysis of three atmospheric dispersion coefficient systems at the Angra dos Reis, RJ, region

    Biagio, Rosa Maria de Souza

    1982-01-01

    A comparative analysis was made in this work among Pasquill-Gifford (PG) atmospheric dispersion coefficients and those determined at the Juelich and Karlsruhe sites with the purpose of suggesting which one would be the most applicable to the Angra site. Each one of the three systems was determined by different experiments, carried out over sites with diversified features. The systems of Juelich and Karlsruhe were obtained over sites with high surface roughness and from stacks (elevated releases), while the PG system was obtained over sites with a small surface roughness and from ground level releases. The results of the application of these systems at a complex site like Angra,which has a highly diversified structure encompassing sea, vegetation, predominance of light winds and stable stability classes, show that the PG system, the most used in the world, is still the best choice. (author)

  12. FULLPROF as a new tool for flipping ratio analysis: further improvements

    Frontera, C.; Rodriguez-Carvajal, J.

    2004-01-01

    In the international workshop on polarized neutron for condensed matter investigation (Juelich, September 2002), we presented the implementations done in FULLPROF in order to introduce the ability of performing flipping ratio analysis. During this year we have modified the program in order to extend the initial features. We have tested these new implementations by re-analyzing flipping ratio data on Metrz-Nit (C 10 H 16 N 5 O 2 ) compound

  13. 500 MHz narrowband beam position monitor electronics for electron synchrotrons

    Mohos, I.; Dietrich, J.

    1998-01-01

    Narrowband beam position monitor electronics were developed in the Forschungszentrum Juelich-IKP for the orbit measurement equipment used at ELSA Bonn. The equipment uses 32 monitor chambers, each with four capacitive button electrodes. The monitor electronics, consisting of an rf signal processing module (BPM-RF) and a data acquisition and control module (BPM-DAQ), sequentially process and measure the monitor signals and deliver calculated horizontal and vertical beam position data via a serial network

  14. Time-of-flight and vector polarization analysis for diffuse neutron scattering

    Schweika, W.

    2003-01-01

    The potential of pulsed neutron sources for diffuse scattering including time-of-flight (TOF) and polarization analysis is discussed in comparison to the capabilities of the present instrument diffuse neutron scattering at the research center Juelich. We present first results of a new method for full polarization analysis using precessing neutron polarization. A proposal is made for a new type of instrument at pulsed sources, which allows for vector polarization analysis in TOF instruments with multi-detectors

  15. The influence of KD and K anti K mesonic molecules in selected reactions; Auswirkung der im KD- und K anti K-Kanal gebildeten mesonischen Molekuele in verschiedenen Reaktionen

    Sassen, F.P.

    2004-07-01

    The attractive potential of the Juelich meson exchange model in the K anti K-channel causes formation of a scalar isoscalar molecule. We investigate this observation from different points of view. First we look at the dependence of pion production in the peripheral reaction {pi}{sup -}p {yields} {pi}{sup 0}{pi}{sup 0}n on the momentum transferred at the nucleus. Accounting for the production via {pi} and a{sub 1} emission in a consistent way, we are able to explain the momentum dependence using the Juelich model. Furthermore we investigate how a measurement of dd {yields} {alpha}K anti K close to threshold may contribute to our knowledge on K anti K interaction and the f{sub 0}(980). The Juelich model links the properties of the f{sub 0}(980) to the a{sub 0}(980). We will use this information to learn about the d anti K-interaction in pp {yields} dK anti K. The recent discovery of the D{sup *}{sub sJ}(2317) o ers a different perspective on the dynamical generation of poles, since it may be connected to the KD-threshold nearby. We construct a SU(4)-extention of the Juelich model including isospin violation. Within this extention a dynamical resonance is formed, which only may explain the D{sup *}{sub sJ}(2317) if isoscalar production is assumed. Special interest is paid to the predicted width of the D{sup *}{sub sJ}(2317) associated with a dynamical interpretation. (orig.)

  16. Trigger electronics for the forward and backward hodoscopes of ANKE

    Dymov, S.N.; Komarov, V.I.; Kulikov, A.V.; Merzlyakov, S.I.; Petrus, A.Yu.; Zhuravlev, N.I.; Mussgiller, A.

    2002-01-01

    Trigger electronics of the forward and backward scintillation hodoscopes of ANKE, the magnetic spectrometer placed at the internal beam line of the COSY-Juelich accelerator, is described. The two developed sets of trigger electronic modules are implemented in the whole ANKE trigger system and are used for the running experiments. For selection of double particle events in the hodoscope both the combinatory logic and the charge discrimination are used

  17. VACOSS 3, a versatile and tamper-resistant electronic sealing system

    Arning, F.; Reuters, H.; Bueker, H.

    1981-01-01

    Seal systems for c/s instrumentation used at present need considerable technical and personal expenditure for installation and verification. This paper describes new electronic seal system VACOSS 3, developed by ProCom GmbH, Aachen, and the Nuclear Research Center Juelich within the frame work of an IAEA research contract. This system allows simple installation, verification, the possibility of remote verification and has high tamper resistance

  18. The EDDA experiment: proton-proton elastic scattering excitation functions at intermediate energies

    Hinterberher, F.

    1996-01-01

    The EDDA experiment is designed to provide a high precision measurement of proton-proton elastic scattering excitation functions ranging from 0.5 to 2.5 GeV of (lab) incident kinetic energy. It is an internal target experiment utilizing the proton beam of the cooler synchrotron COSY operated by KFA Juelich. The excitation functions are measured during the acceleration ramp of COSY. (author)

  19. Kernenergie aus der Sicht von Jugendlichen

    Peters, H. P.

    1985-01-01

    To analyze the cognitions of students regarding the energy topic a content analysis of 57 essays about problems of energy supply, written by German High School students, was conducted. The material used for the content analysis was gathered by an essay competition announced by the Nuclear Research Center in Juelich.Since the participation was voluntary, our sample does not represent a true cross-section of all students. Rather it is biased in several ways. Students who are in favour of nuclea...

  20. Can the Σ-nn system be bound?

    Stadler, A.; Gibson, B.F.

    1994-01-01

    Motivated by the Σ-hypernuclear states reported in (K - ,π ± ) experiments, we have explored the possibility that there exists a particle-stable Σ - nn bound state. For the Juelich A hyperon-nucleon, realistic-force model, our calculations yield little reason to expect a positive-parity bound state or resonance in either the J=1/2 or the J=3/2 channels

  1. Pathfinder irradiation of advanced fuel (Th/U mixed oxide) in a power reactor

    Brant Pinheiro, R.

    1993-01-01

    Within the joint Brazilian-German cooperative R and D Program on Thorium Utilization in Pressurized Water Reactors carried out from 1979 to 1988 by Nuclebras/CDTN, KFA-Juelich, Siemens/KWU and NUKEM, a pathfinder irradiation of Th/U mixed oxide fuel in the Angra 1 nuclear power reactor was planned. The objectives of this irradiation testing, the irradiation strategy, the work performed and the status achieved at the end of the joint Program are presented. (author)

  2. Feasibility of deuteron break-up study at COSY 0 deg facility (ANKE)

    Kacharava, A.K.; Komarov, V.I.; Kulikov, A.V.; Macharashvili, G.G.; Petrus, A.Yu.

    1996-01-01

    The experimental setup ANKE (Apparatus for study of Nuclear and Kaonic Ejectiles) under construction at the Cooling Synchrotron (COSY, Juelich) is aimed to study a wide class of proton-nucleus reactions. The kinematic conditions, detection efficiencies and useful event selection criteria for the deuteron break-up study at the COSY internal proton beam are considered in this paper. The expected counting rates for the detector systems are also estimated. 16 refs., 11 figs., 3 tabs

  3. Characterisation and development of fine porosity in magnesium potassium phosphate ceramics

    Viani, Alberto; Radulescu, A.; Pérez-Estébanez, Marta

    2015-01-01

    Roč. 161, December (2015), s. 628-630 ISSN 0167-577X R&D Projects: GA MŠk(CZ) LO1219 Keywords : amorphous materials * chemically-bonded ceramics * microstructure * Rietveld-RIR method * small-angle neutron scattering * specific surface area Subject RIV: AL - Art, Architecture, Cultural Heritage Impact factor: 2.437, year: 2015 https://juser.fz-juelich.de/record/255737

  4. The nuclear waste disaster. A view behind the curtain of the presumably clean nuclear power; Das Atommuell-Desaster. Blicke hinter die Kulissen der angeblich sauberen Atomenergie

    Schumacher, Julia; Simon, Armin; Stay, Jochen (comps.)

    2015-04-15

    The brochure on the nuclear waste disaster - a view behind the curtain of the presumably clean nuclear power discusses the following topics: Thuringia and Saxony - radiating landscapes, Gronau - 100.000 tons for eternity, Gundremmingen - nuclear waste records and castor shortage, Brunsbuettel - castor storage facility without licensing, Juelich the pebble bed drama, Karlsruhe - the hall is filled, Obrigheim - radioactive waste for cooking pots, Asse - the ticking bomb, final repositories - an illusion without solution, stop the waste production, Germany - endless nuclear waste.

  5. Socio-politics aspects of the nuclear energy

    Rodriguez, F.E.

    1988-01-01

    This paper analyzes some topics that should be taken into account when a country desires to introduce the nuclear power into its electricity generation energy grid. This makes a description about the estimation of risk perception, giving a proposal for a combined information and educational programme. The present work was based on a survey of a nuclear research team at the Nuclear Center in Juelich, West Germany

  6. (p,3He) reactions on 1p shell nuclei at 41 and 45 MeV

    Rapp, V.

    1982-01-01

    In the present thesis the (p, 3 He) reactions on target nuclei of the 1p shell were studied. The measurements were performed at the isochronous cyclotron of the KFA Juelich. Angular distribution at 41 and 45 MeV to residual nuclear states in 7 Li, 8 Be, 9 Be, 10 B, 11 B, 12 C, 13 C, and 14 N. were evaluated. (orig.) [de

  7. Hydrogen-metal systems

    Wenzl, H.; Springer, T.

    1976-01-01

    A survey is given on the alloys of metal crystals with hydrogen. The system niobium-hydrogen and its properties are especially dealt with: diffusion and heat of solution of hydrogen in the host crystal, phase diagram, coherent and incoherent phase separation, application of metal-hydrogen systems in technology. Furthermore, examples from research work in IFF (Institut fuer Festkoerperforschung) of the Nuclear Research Plant, Juelich, in the field of metal-H systems are given in summary form. (GSC) [de

  8. Targets for neutron beam spallation sources

    Bauer, G.S.

    1980-01-01

    The meeting on Targets for Neutron Beam Spallation Sources held at the Institut fuer Festkoerperforschung at KFA Juelich on June 11 and 12, 1979 was planned as an informal get-together for scientists involved in the planning, design and future use of spallation neutron sources in Europe. These proceedings contain the papers contributed to this meeting. For further information see hints under relevant topics. (orig./FKS)

  9. Status and perspectives of the dismantling of nuclear power plants in Germany (Dismantling monitoring 2015); Stand und Perspektiven des Rueckbaus von Kernkraftwerken in Deutschland (''Rueckbau-Monitoring 2015'')

    Wealer, Ben; Seidel, Jan Paul [Technische Univ. Berlin (Germany); Gerbaulet, Clemens; Hirschhausen, Christian von [Technische Univ. Berlin (Germany); Deutsches Institut fuer Wirtschaftsforschung, Berlin (Germany)

    2015-11-15

    The dismantling monitoring 2015 covers the nuclear power plants HDR Grosswelzheim, Niederaichbach (KKN), MZFR Karlsruhe, Lingen (KWL), Gundremmingen unit A (KRB-A), VAK Kahl, Muehlheim-Kaerlich (KMK), THTR-300 Hamm-Uentrop, AVR Juelich, Greifswald (KGR 1-5), KNK II Karlsruhe, Rheinsberg (KKR), Wuergassen (KWW), Stade (KKS), Obrigheim (KWO), SNR 300. The post-operational phase activities of other shut-down nuclear power plants and the active companies are summarized.

  10. Large-scale research in the Federal Republic of Germany. Pt. 4

    Mock, W.

    1986-01-01

    The name is misleading: in the biggest of 13 large-scale research institutions, the KFA Nuclear Research Centre Juelich, nuclear research is now only one sphere of activities among many, besides other areas of research such as computer science, materials, and environmental research. This change in the areas of main emphasis constitutes the successful attempt - or so it seems up to now - of a 'research dinosaur' to answer to the necessities of an altered 'research landscape'. (orig.) [de

  11. NIC symposium 2010. Proceedings

    Muenster, Gernot [Muenster Univ. (Germany). Inst. fuer Theoretische Physik 1; Wolf, Dietrich [Duisburg-Essen Univ., Duisburg (Germany). Fakultaet fuer Physik; Kremer, Manfred (eds.) [Forschungszentrum Juelich GmbH (DE). Juelich Supercomputing Centre (JSC)

    2012-06-21

    The fifth NIC-Symposium gave an overview of the activities of the John von Neumann Institute for Computing (NIC) and of the results obtained in the last two years by research groups supported by the NIC. The large recent progress in supercomputing is highlighted by the fact that the newly installed Blue Gene/P system in Juelich - with a peak performance of 1 Petaflop/s - currently ranks number four in the TOP500 list. This development opens new dimensions in simulation science for researchers in Germany and Europe. NIC - a joint foundation of Forschungszentrum Juelich, Deutsches Elektronen-Synchrotron (DESY) and Gesellschaft fuer Schwerionenforschung (GSI) - supports with its members' supercomputer facilities about 130 research groups at universities and national labs working on computer simulations in various fields of science. Fifteen invited lectures covered selected topics in the following fields: Astrophysics Biophysics Chemistry Elementary Particle Physics Condensed Matter Materials Science Soft Matter Science Environmental Research Hydrodynamics and turbulence Plasma Physics Computer Science The talks are intended to inform a broad audience of scientists and the interested public about the research activities at NIC. The proceedings of the symposium cover projects that have been supported by the IBM supercomputers JUMP and IBM Blue Gene/P in Juelich and the APE topical computer at DESY-Zeuthen in an even wider range than the lectures.

  12. NIC symposium 2010. Proceedings

    Muenster, Gernot

    2012-01-01

    The fifth NIC-Symposium gave an overview of the activities of the John von Neumann Institute for Computing (NIC) and of the results obtained in the last two years by research groups supported by the NIC. The large recent progress in supercomputing is highlighted by the fact that the newly installed Blue Gene/P system in Juelich - with a peak performance of 1 Petaflop/s - currently ranks number four in the TOP500 list. This development opens new dimensions in simulation science for researchers in Germany and Europe. NIC - a joint foundation of Forschungszentrum Juelich, Deutsches Elektronen-Synchrotron (DESY) and Gesellschaft fuer Schwerionenforschung (GSI) - supports with its members' supercomputer facilities about 130 research groups at universities and national labs working on computer simulations in various fields of science. Fifteen invited lectures covered selected topics in the following fields: Astrophysics Biophysics Chemistry Elementary Particle Physics Condensed Matter Materials Science Soft Matter Science Environmental Research Hydrodynamics and turbulence Plasma Physics Computer Science The talks are intended to inform a broad audience of scientists and the interested public about the research activities at NIC. The proceedings of the symposium cover projects that have been supported by the IBM supercomputers JUMP and IBM Blue Gene/P in Juelich and the APE topical computer at DESY-Zeuthen in an even wider range than the lectures.

  13. NIC symposium 2010. Proceedings

    Muenster, Gernot [Muenster Univ. (Germany). Inst. fuer Theoretische Physik 1; Wolf, Dietrich [Duisburg-Essen Univ., Duisburg (Germany). Fakultaet fuer Physik; Kremer, Manfred [Forschungszentrum Juelich GmbH (DE). Juelich Supercomputing Centre (JSC)

    2012-06-21

    The fifth NIC-Symposium gave an overview of the activities of the John von Neumann Institute for Computing (NIC) and of the results obtained in the last two years by research groups supported by the NIC. The large recent progress in supercomputing is highlighted by the fact that the newly installed Blue Gene/P system in Juelich - with a peak performance of 1 Petaflop/s - currently ranks number four in the TOP500 list. This development opens new dimensions in simulation science for researchers in Germany and Europe. NIC - a joint foundation of Forschungszentrum Juelich, Deutsches Elektronen-Synchrotron (DESY) and Gesellschaft fuer Schwerionenforschung (GSI) - supports with its members' supercomputer facilities about 130 research groups at universities and national labs working on computer simulations in various fields of science. Fifteen invited lectures covered selected topics in the following fields: Astrophysics Biophysics Chemistry Elementary Particle Physics Condensed Matter Materials Science Soft Matter Science Environmental Research Hydrodynamics and turbulence Plasma Physics Computer Science The talks are intended to inform a broad audience of scientists and the interested public about the research activities at NIC. The proceedings of the symposium cover projects that have been supported by the IBM supercomputers JUMP and IBM Blue Gene/P in Juelich and the APE topical computer at DESY-Zeuthen in an even wider range than the lectures.

  14. Enrichment technology. Dependable vendor of gas centrifuges

    Anon.

    2011-01-01

    Enrichment Technology is an innovative, high-tech company that develops, manufactures and installs gas centrifuges for enriching uranium. In addition, Enrichment Technology designs enrichment plants that use gas centrifuge technology. This technology offers the most efficient and cost-effective method for enriching uranium yet: high-performance, safe technology that dominates the market with a global share of 45 percent. A determining factor in Enrichment Technology's success is its mission: supplying its customers with safe, reliable technology. Production of the centrifuges requires versatile know-how and collaboration between different departments as well as interdisciplinary teams at the various sites. More than 2000 operators at 8 sites in 5 countries contribute their individual knowledge and personal skills in order to produce this exceptional technology. The head office is in Beaconsfield near London and the operational headquarters are in Almelo in the Netherlands. There are other sites in Germany (Juelich und Gronau), Great Britain (Capenhurst) as well as project sites in the USA and France. Capenhurst is where experienced engineers design new enrichment plants and organise their construction. Centrifuge components are manufactured in Almelo and Juelich, while the pipework needed to connect up the centrifuges is produced at the site in Gronau. In Juelich, highly qualified scientists in interdisciplinary teams are continuously researching ways of improving the current centrifuges. Communication between specialists in the fields of chemistry, physics and engineering forms the basis for the company's success and the key to extending this leading position in the global enrichment market. (orig.)

  15. Association EURATOM-FZJ. Annual progress report 2010. Nuclear fusion project. SC-FZJ 86(11)/4.1.2

    Schorn, Ralph P.

    2011-01-01

    Forschungszentrum Juelich (FZJ) as a EURATOM Association coordinates its fusion research activities within the Nuclear Fusion Project (KFS). The programme is based on several institutes and is well embedded into the European fusion research structure, where FZJ is now focussing on the two topics ''plasma-wall interactions'' and ''ITER technology''. The major part of the Juelich research activities is located within the Institute of Energy and Climate Research (IEK). The former Institute for Plasma Physics (IPP, now IEK-4 Plasma Physics) has by far the largest share of scientific staff in physics and technology for fusion, operates the TEXTOR tokamak, performs scientific work on JET and DIII-D, supports the Wendelstein 7-X construc-tion and takes up significant projects related to the ITER development. IEK-2 (Microstructure and Properties of Materials) operates the high heat flux test facilities JUDITH 1 and 2 which are installed inside a hot cell and in a controlled area which is licensed to operate with toxic and radiating materials; this group represents the materials science expertise within the Juelich fusion programme. The Central Technology Division (ZAT) provides engineering expertise and specialised workshop capacities. The Juelich Supercomputing Centre (JSC) operates various types of supercomputer systems, among which one device (HPC-FF) is dedicated exclusively to fusion research within EFDA. The Association EURATOM-FZJ has very close contacts to the neighbouring EURATOM associations in Belgium and The Netherlands. In 1996 they together have founded the Trilateral Euregio Cluster (TEC) which provides a clustering of resources in order to perform a co-ordinated R and D programme, to operate or construct large facilities (TEXTOR, MAGNUM-PSI), to combine different kinds of expertise and to allow for the forming of a strong partner-ship as a consortium within the ITER construction phase. An updated TEC agreement with a

  16. Applications of INAA with Ghent k0 factors to the analysis of high-purity metals and ceramics

    Erdtmann, G.; Petri, H.; Kaysser, B.; Kueppers, G.

    1988-01-01

    Reactor neutron activation analysis (NAA) has been applied for many years in the chemical-analytical service carried out by the Central Division of Chemical Analysis at Kernforschungsanlage Julich. At this research center, two new research programs were started in 1986: high-temperature-resistant materials and structure ceramics, and basic research for information technology. Trace element analyses of materials are required for both programs, and the demand for activation analyses has largely increased. In most cases they are carried out by a purely instrumental technique, and radiochemical NAA is applied but with some special problems. Activation analyses have been carried out for a number of high-purity and ceramic materials, and the paper shows detection limits obtained with some of them. The differences in detection limits depend not only on the types of materials and the levels of impurities but also on the irradiation and counting conditions chose. In order to obtain realistic estimations of the uncertainties of the results, all sources of error have been considered and their influence on total uncertainties calculated via the error propagation law applied to the equation of absolute activation analysis

  17. A superconducting magnet for g-factor studies at JOSEF

    Borgs, J.W.; Chatzipetros, J.; Lawin, H.; Menzen, G.; Sistemich, K.; Wolf, A.

    1987-01-01

    A superconducting magnet has been constructed for the determination of excited-state g-factors of fission products through perturbed angular correlation measurements at the separator JOSEF. The system contains a channel at room temperature which allows the rapid transport of radioactive samples with a tape device into the centre of the magnet. Thus experiments on the γ radiation from short-lived β/sup -/ decaying nuclei are possible. The coils of the magnet have been built by Oxford Instruments Ltd while the cryostat has been designed and manufactured in the central workshop of the Kernforschungsanlage Julich. The maximum field strength is 6.54 T at a current of 59 A and the homogeneity is better than one percent for an area with a radius of 0.5 cm at the centre of the magnet. The liquid helium consumption is only 0.3 1/h. The magnet has been used for the determination of the g-factors of the 2/sub 1//sup +/ states in /sup 102/Mo and /sup 104/Mo

  18. COSY, proposal for a cooler synchrotron at the KFA Julich

    Berg, G.P.A.; Gaul, G.; Hacker, H.

    1986-01-01

    The Cooler Synchrotron COSY is being planned in cooperation between scientists of the Kernforschungsanlage Julich, nuclear physicists of the neighbouring universities and other interested scientists. COSY is designed to provide beams of very light ions with energies ranging from 40 MeV to a maximum of 2.5 GeV for protons. This energy range allows a variety of studies in the so called energy window between 150 and 500 MeV, and it permits different kinds of investigations in the medium-energy region including the KΛ-threshold. Both electron cooling and stochastic cooling are foreseen in order to obtain very high phase-space density. The existing isochronous cyclotron JULIC will serve as injector. COSY will contain two bending sections, each consisting of three unit cells, and two long straight sections between the bends. Large flexibility is guaranteed by the ion-optical design. Experiments are being planned that make use either of the high quality external beam prepared by slow extraction or of the very high luminosity that is effective in the recirculator mode of operation

  19. Association EURATOM-FZJ. Annual progress report 2012. SC-FZJ 90(13)/4.1.2

    2012-01-01

    The Helmholtz Association's (HGF) fusion activities are in line with the European fusion re-search programme. The following Helmholtz Centres are involved: Max Planck Institute of Plasma Physics (IPP, Garching and Greifswald), Karlsruhe Institute of Technology (KIT), and Forschungszentrum Juelich (FZJ). This report presents results having been achieved by FZJ in the year 2012. Forschungszentrum Juelich as a EURATOM Association coordinates its fusion research activities within the Nuclear Fusion Project (KFS). The programme is based on several institutes and is well embedded into the European fusion research structure. The major part of the Juelich research activities is located within the Institute of Energy and Climate Research (IEK). This is organized along a number of institute parts, among which fusion research is concentrated within IEK-4 Plasma Physics and IEK-2 Microstructure and Properties of Materials. The IEK-4 Plasma Physics has the largest share of scientific staff in physics and technology for fusion, operates the TEXTOR tokamak, performs scientific work on JET and DIII-D, supports the Wendelstein 7-X construction and takes up significant projects related to the development of ITER. With the recent appointment of a new second director at IEK-4 (Prof. Linsmeier) it is intended to enhance the materials science expertise within the Juelich fusion programme and in particular in IEK-4: This will complement the activities in IEK-2, which operates the high heat flux test facilities JUDITH 1 and 2. They are installed inside a Hot Cell and in a controlled area which is licensed to operate with toxic and radiating materials. The Central Technology Division (ZEA1) provides engineering expertise and specialised workshop capacities. The Juelich Supercomputing Centre (JSC) operates various types of super-computer systems, among which one device (HPC-FF) is dedicated exclusively to fusion research within EFDA. The Association EURATOM-FZJ has very close contacts

  20. Bilateral cooperation between Germany and Brazil on fuel irradiation

    Dias, J.W.

    1977-01-01

    Within the framework of the Government Agreement on Scientific and Technical Cooperation between the Federal Republic of Germany and Brazil, the Brazilian National Atomic Commission and the Juelich Nuclear Research Center (KFA) signed on 23rd April, 1971 an Agreement on Cooperation in the field of Nuclear Research and Reactor Technology. Projects have been elaborated in fields of mutual interest to share activities between the partner institutes in both countries. A typical project is the fuel irradiation programme jointly prepared by NUCLEBRAS and KFA-Juelich. Brazil is planning to use elements of its own production in nuclear power plants to be erected within the German-Brazilian Industrial Agreement. As no material test reactor is available in Brazil it is expedient to irradiate samples of Brazilian production in Germany. Brazilian collaborators will participate in the preparation, execution and post-irradiation examination. In this way an optimum transfer of all information and results is assured. In the first phase, sample rods manufactured in Brazil are irradiated in the FRJ-2 test reactor in Juelich. These rods are assembled under clean conditions in the NUCLEBRAS research centres. The first Brazilian test rods showed excellent in-pile behaviour even under very high fuel rod capacity. In the second phase, fuel rods of original length manufactured and assembled in Brazil will be irradiated in German power plants, and, at the same time, additional irradiations of small samples will be carried out in test reactors. In the third phase, rod clusters and complete fuel elements will be manufactured in Brazil and irradiated in German power plants until target burn-up. All the necessary prerequisites have been fulfilled to meet the above requirements, i.e. mutual interest, good infrastructure maintained by both partners, qualified personnel and last but not least unbureaucratic and effective help by the coordinating offices of NUCLEBRAS and KFA

  1. Enrichment technology. Dependable vendor of gas centrifuges; Enrichment Technology. Zuverlaessiger Lieferant von Gaszentrifugen

    Anon.

    2011-10-15

    Enrichment Technology is an innovative, high-tech company that develops, manufactures and installs gas centrifuges for enriching uranium. In addition, Enrichment Technology designs enrichment plants that use gas centrifuge technology. This technology offers the most efficient and cost-effective method for enriching uranium yet: high-performance, safe technology that dominates the market with a global share of 45 percent. A determining factor in Enrichment Technology's success is its mission: supplying its customers with safe, reliable technology. Production of the centrifuges requires versatile know-how and collaboration between different departments as well as interdisciplinary teams at the various sites. More than 2000 operators at 8 sites in 5 countries contribute their individual knowledge and personal skills in order to produce this exceptional technology. The head office is in Beaconsfield near London and the operational headquarters are in Almelo in the Netherlands. There are other sites in Germany (Juelich und Gronau), Great Britain (Capenhurst) as well as project sites in the USA and France. Capenhurst is where experienced engineers design new enrichment plants and organise their construction. Centrifuge components are manufactured in Almelo and Juelich, while the pipework needed to connect up the centrifuges is produced at the site in Gronau. In Juelich, highly qualified scientists in interdisciplinary teams are continuously researching ways of improving the current centrifuges. Communication between specialists in the fields of chemistry, physics and engineering forms the basis for the company's success and the key to extending this leading position in the global enrichment market. (orig.)

  2. The present state of the HTR concept based on experience gained from AVR and THTR

    Wachholz, W.

    1989-01-01

    During the past ten years the development of a specific HTR concept has made remarkable progress. This has been mainly characterized by making use of the safety characteristics typical of the High-Temperature Reactor (HTR). In the design, construction and operation of High-Temperature Reactors - especially AVR (15 MWe plant in Juelich, FRG) and THTR (300 MWe plant in Hamm-Uentrop, FRG) - comprehensive experience has been gained in the field of operational availability and safety, accident topology and plant risk of HTRs in recent years. This experience is relevant for the entire HTR line independent of specific projects. (author). 3 refs, 5 figs, 1 tab

  3. CIPANP 2006 Low Energy Hadron Physics Summary

    Schumacher, Reinhard A.

    2006-01-01

    Recent results in the areas of hypernuclear physics, exotic atoms, photo- and electro-production of light mesons and baryons, and medium modifications of meson properties were presented at this conference. Facility highlights presentations were given for five laboratories: the ELSA complex at Bonn, the LEPS facility at SPring-8, the CLAS facility at Jefferson Lab, the MAMI complex at Mainz, and the COSY complex at Juelich. These talks collectively showed remarkably active programs at all these laboratories, as well as at BNL, KEK, PSI, and Frascati. No 'brand new' results were reported at this conference

  4. Constrained minimization in C ++ environment

    Dymov, S.N.; Kurbatov, V.S.; Silin, I.N.; Yashchenko, S.V.

    1998-01-01

    Based on the ideas, proposed by one of the authors (I.N.Silin), the suitable software was developed for constrained data fitting. Constraints may be of the arbitrary type: equalities and inequalities. The simplest of possible ways was used. Widely known program FUMILI was realized to the C ++ language. Constraints in the form of inequalities φ (θ i ) ≥ a were taken into account by change into equalities φ (θ i ) = t and simple inequalities of type t ≥ a. The equalities were taken into account by means of quadratic penalty functions. The suitable software was tested on the model data of the ANKE setup (COSY accelerator, Forschungszentrum Juelich, Germany)

  5. Contributions for the chemistry, physics and technology of the elementary carbon in various states for the Carbon '76

    Delle, W.W.

    1976-07-01

    This report is the compilation of a number of papers prepared by KFA Juelich for the 2nd International Carbon Conference CARBON '76 at Baden-Baden, June 28th - July 2nd, 1976. The presentations deal with objectives of chemistry, physics and technology of the elementary carbon in various states including irradiation induced effects on graphite and pyrolytic carbon. The work was partly sponsored by the Bundesministerium fuer Forschung und Technologie of the Federal Republic of Germany as well as by the Government of North-Rhine-Westfalia. (orig.) [de

  6. Advances in neutron scattering spectroscopy

    White, J.W.

    1977-01-01

    Some aspects of the application of neutron scattering to problems in polymer science, surface chemistry, and adsorption phenomena, as well as molecular biology, are reviewed. In all these areas, very significant work has been carried out using the medium flux reactors at Harwell, Juelich and Risoe, even without the use of advanced multidetector techniques or of a neutron cold source. A general tendency can also be distinguished in that, for each of these new fields, a distinct preference for colder neutrons rather than thermal neutron beams can be seen. (author)

  7. Prompt gamma cold neutron activation analysis applied to biological materials

    Rossbach, M.; Hiep, N.T.

    1992-01-01

    Cold neutrons at the external neutron guide laboratory (ELLA) of the KFA Juelich are used to demonstrate their profitable application for multielement characterization of biological materials. The set-up and experimental conditions of the Prompt Gamma Cold Neutron Activation Analysis (PGCNAA) device is described in detail. Results for C, H, N, S, K, B, and Cd using synthetic standards and the 'ratio' technique for calculation are reported for several reference materials and prove the method to be reliable and complementary with respect to the elements being determined by INAA. (orig.)

  8. The nuclear disposal challenge

    2011-01-01

    In Germany, GNS Gesellschaft fuer Nuklear-Service mbH is in charge of all operations regarding the management of waste and residual materials from nuclear power plants. Jointly with its subsidiaries, GNS is reliably ensuring the safe packaging, treatment, transport and interim storage of these materials. Moreover, as the inventor and manufacturer of the CASTOR registered casks, GNS is the global leader in the field of casks for HLW. At its locations in Essen, Muelheim, Duisburg, Juelich, Karlsruhe, Ahaus and Gorleben, the GNS group has more than 550 employees and achieves a yearly turnover of more than 200 million Euro. (orig.)

  9. The high-temperature reactor's attractiveness lies in passive safety

    Anon.

    1987-01-01

    In the recent years the use of nuclear energy has turned from a technical and scientific issue to a political one. The high-temperature reactor (HTR) however, has always been advertised as particularly safe. The present situation and future developments of HTR-technology were the two issues that VDI-News brought up on the 27th October on an HTR-conference in an interview with the 'spiritual father' of the HTR, Prof. Dr. Rudolf Schulten of the Juelich Nuclear Research Centre. (orig.) [de

  10. Scientific report. Plasma-wall interaction studies related to fusion reactor materials

    Temmerman, G. De

    2006-01-01

    This scientific report summarises research done on erosion and deposition mechanisms affecting the optical reflectivity of potential materials for use in the mirrors used in fusion reactors. Work done in Juelich, Germany, at the Federal Institute of Technology in Lausanne, Switzerland, the JET laboratory in England and in Basle is discussed. Various tests made with the mirrors are described. Results obtained are presented in graphical and tabular form and commented on. The influence of various material choices on erosion and deposition mechanisms is discussed

  11. Abbreviations used in scientific and technical reports

    Sun Chang.

    1986-04-01

    Reports contain a large number of abbreviations which have not yet been included in the current specialized dictionaries or lists of abbreviations. It is therefore often time-consuming or even fruitless to search for such abbreviations. The present alphabetical list of more than 4,000 abbreviations gathered from the report inventory of the Central Library of the KFA Juelich in the period from 1982-1986, taking into consideration all the scientific and technical disciplines, is intended to remedy a deficiency and to offer assistance which will undoubtedly be welcomed by scientists and engineers. (orig./HP) [de

  12. SRF technology at accel for worldwide accelerator projects

    Bauer, S.; Griep, B.; Peiniger, M.; Pekeler, M.; Piel, C.; Stein, P. vom; Vogel, H.

    2003-01-01

    Within the last two years activities at ACCEL for international accelerator projects using superconducting cavities have steadily increased. We report on our production work for CERN (HOM couplers for LHC cavities), DESY (TESLA cavities and couplers), Forschungszentrum Juelich (turn key low beta SRF module), SRRC, CLS and Cornell (turn key 500 MHz SRF modules. The production a superconducting Landau accelerator module for BESSY has started recently. In addition studies are under way for a superconducting 40 MeV proton/deuteron linac and for superconducting low beta multi gap structures. (author)

  13. The ADAM and EVE project: Heat transfer at ambient temperature

    Boltendahl, U.; Harth, R.

    1980-01-01

    In the nuclear research plant at Juelich a new heating system is at present being developed as part of the Nuclear Long-distance Heating Project. Helium is heated up in a high-temperature reactor. The heat chemically converts a gas mixture in a reformer plant (EVE). The gases 'charged' with energy can be transported through tubes over any distance required at ambient temperatures. In a methanisation plant (ADAM) the gases react with one another, releasing the energy in the form of heat which can be used for heating air or water. (orig.) [de

  14. Thin and thick target benchmark investigations to validate spallation physics models

    Filges, D.; Neef, R.D.; Goldenbaum, F.; Nuenighoff, K.; Galin, J.; Letourneau, A.; Lott, B.; Patois, Y.; Schroeder, W.N.

    1999-01-01

    In the ESS (European Spallation Source) study report several areas have been identified where further spallation physics research and code validation is urgently needed: Neutron and charged particle production and multiplicities above one GeV incident protons, energy deposition and heating, material damage parameters, radioactivity and after heat, and high energy source shielding. All simulation calculations will be done using the Juelich HERMES code system. For this purpose various collaborations were organised. One of the collaborations is NESSI (Neutron Scintillator Silicon Detector), which concerns fundamental data as cross-section measurements on neutron multiplicities and charged particles for different ESS relevant materials. (author)

  15. The polarized atomic-beam target for the EDDA experiment and the time-reversal invariance test at COSY

    Eversheim, P.D.; Altmeier, M.; Felden, O.

    1996-01-01

    For the the EDDA experiment, which was set up to measure the p-vector - p-vector excitation function during the acceleration ramp of the cooler synchrotron COSY at Juelich, a polarized atomic-beam target was designed regarding the restrictions imposed by the geometry of the EDDA detector. Later, when the time-reversal invariance experiment is to be performed, the EDDA detector will serve as efficient internal polarimeter and the source has to deliver tensor polarized deuterons. The modular design of this polarized atomic-beam target that allows to meet these conditions are discussed in comparison to other existing polarized atomic-beam targets. (orig.)

  16. Institute of Energy and Climate Research IEK-6. Nuclear Waste Management report 2011/2012. Material science for nuclear waste management

    Klinkenberg, M.; Neumeier, S.; Bosbach, D.

    2013-01-01

    The nuclear waste management section of the Institute of Energy and Climate Research IEK-6 in Juelich is focused on research on radiochemistry aspects/materials science relevant for the long-term safety of nuclear waste storage and disposal. Studies on innovative waste management strategies include partitioning o actinides and the development of ceramic waste forms. Structural research is covering solid state chemistry, crystallography and computational science to model actinide containing compounds. With respect to waste management concepts nondestructive essay techniques, waste treatment procedures and product quality control strategies were developed.

  17. The hyperon-nucleon interaction

    Haidenbauer, J.

    2007-01-01

    Results of two recent hyperon-nucleon interaction potentials, both developed by the Bonn-Juelich group, are presented that are derived either in the conventional meson-exchange picture or within leading order chiral effective field theory. The chiral potential consists of one-pseudoscalar-meson exchanges and non-derivative four-baryon contact terms. The most salient feature of the new meson-exchange hyperon-nucleon model is that the contributions in the scalar-isoscalar (σ) and vector-isovector (ρ) exchange channels are constrained by a microscopic model of correlated ππ and KK-bar exchange

  18. ITER baffle module small-scale mock-ups: first wall thermo-mechanical testing results

    Severi, Y.; Giancarli, L.; Poitevin, Y.; Salavy, J.F.; Le Marois, G.; Roedig, M.; Vieider, G.

    1998-01-01

    The EU-home team is in charge of the R and D related to the ITER baffle first wall. Five small-scale mock-ups, using Be, CFC and W tiles and different armour/heat-sink material joints under development, have been fabricated and thermomechanically tested in FE200 (Le Creusot) and JUDITH (Juelich) electron beam facilities. The small-scale mock-ups have been submitted to thermo-mechanical fatigue tests (up to failure using accelerating techniques). The objective was to determine the performances of the armour material joints under high heat flux cycles. (orig.)

  19. Attenuation correction for hybrid MR/PET scanners: a comparison study

    Rota Kops, Elena [Forschungszentrum Jülich GmbH, Jülich (Germany); Ribeiro, Andre Santos [Imperial College London, London (United Kingdom); Caldeira, Liliana [Forschungszentrum Jülich GmbH, Jülich (Germany); Hautzel, Hubertus [Heinrich-Heine-University Düsseldorf, Düsseldorf (Germany); Lukas, Mathias [Technische Universitaet Muenchen, Munich (Germany); Antoch, Gerald [Heinrich-Heine-University Düsseldorf, Düsseldorf (Germany); Lerche, Christoph; Shah, Jon [Forschungszentrum Jülich GmbH, Jülich (Germany)

    2015-05-18

    Attenuation correction of PET data acquired in hybrid MR/PET scanners is still a challenge. Different methods have been adopted by several groups to obtain reliable attenuation maps (mu-maps). In this study we compare three methods: MGH, UCL, Neural-Network. The MGH method is based on an MR/CT template obtained with the SPM8 software. The UCL method uses a database of MR/CT pairs. Both generate mu-maps from MP-RAGE images. The feed-forward neural-network from Juelich (NN-Juelich) requires two UTE images; it generates segmented mu-maps. Data from eight subjects (S1-S8) measured in the Siemens 3T MR-BrainPET scanner were used. Corresponding CT images were acquired. The resulting mu-maps were compared against the CT-based mu-maps for each subject and method. Overlapped voxels and Dice similarity coefficients, D, for bone, soft-tissue and air regions, and relative differences images were calculated. The true positive (TP) recognized voxels for the whole head were 79.9% (NN-Juelich, S7) to 92.1% (UCL method, S1). D values of the bone were D=0.65 (NN-Juelich, S1) to D=0.87 (UCL method, S1). For S8 the MHG method failed (TP=76.4%; D=0.46 for bone). D values shared a common tendency in all subjects and methods to recognize soft-tissue as bone. The relative difference images showed a variation of -10.9% - +10.1%; for S8 and MHG method the values were -24.5% and +14.2%. A preliminary comparison of three methods for generation of mu-maps for MR/PET scanners is presented. The continuous methods (MGH, UCL) seem to generate reliable mu-maps, whilst the binary method seems to need further improvement. Future work will include more subjects, the reconstruction of corresponding PET data and their comparison.

  20. The Siemens-Argonaut reactor as a driver zone for a high-temperature reactor cell. Der Siemens-Argonaut-Reaktor als Treiberzone fuer eine Hochtemperaturreaktorzelle

    Mueller, H; Schuerrer, F; Ninaus, W; Oswald, K; Rabitsch, H; Kreiner, H [Technische Univ., Graz (Austria). Inst. fuer Theoretische Physik und Reaktorphysik; Neef, R D [Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Reaktorentwicklung

    1984-12-15

    To enable a validation of neutron physics calculation methods for pebble bed reactors the inner reflector of an Argonaut research reactor was substituted by a full of about 1200 fuel elements of the AVR-Juelich type. The report describes the measuring instruments and the reactor physical layout of the arrangement by the code packages GAMTEREX, ZUT-D.G.L. and MUPO. Comparison of calculated reaction rates with measurements show good agreement. Application of the codes to high-temperature reactors in abnormal states is envisaged. (Author, translated by G.Q.)

  1. BMFT. Subproject environmental research, ecological research. Annual report 1991

    1992-01-01

    This report summarizes the 1991 ecological research activities (ecosystems research, urban ecology, tropical ecology, forest decline, ecology of soils and waters, ecotoxicology, environmental pollution and health, protection of biotopes and protection of the species) which the project sponsors 'biology, energy, ecology' (Forschungszentrum Juelich) and 'environmental research and climatological research' (GSF-Forschungszentrum fuer Umwelt und Gesundheit) have been supervising on behalf of the Federal Ministry for Research and Technology to promote the subproject 'environmental research'. A general survey introduces the promoted projects, and standardized data sheets briefly introduce the individual activities. The appendix gives the project indices, the indices of joint projects, and a list of the supported companies and institutions. (BBR) [de

  2. Nuclear energy research in Germany 2008. Research centers and universities

    Tromm, Walter

    2009-01-01

    This summary report presents nuclear energy research at research centers and universities in Germany in 2008. Activities are explained on the basis of examples of research projects and a description of the situation of research and teaching in general. Participants are the - Karlsruhe Research Center, - Juelich Research Center (FZJ), - Dresden-Rossendorf Research Center (FZD), - Verein fuer Kernverfahrenstechnik und Analytik Rossendorf e.V. (VKTA), - Technical University of Dresden, - University of Applied Sciences, Zittau/Goerlitz, - Institute for Nuclear Energy and Energy Systems (IKE) at the University of Stuttgart, - Reactor Simulation and Reactor Safety Working Group at the Bochum Ruhr University. (orig.)

  3. Experimental investigation of neutron generation in thick target blocks of Pb, Hg and W with 0.4 to 2.5 GeV proton beams

    Jahnke, U.; Enke, M.; Filges, D.

    2002-01-01

    Detailed experimental neutron data relevant to the design of the target station of neutron spallation sources have been gathered by the NESSI-collaboration at the COSY accelerator in FZ Juelich. Numerous neutron multiplicity distributions and reaction probabilities have been measured for 0.4 to 2.5 GeV protons bombarding highly segmented target blocks from Pb, Hg and W of up to 35 cm in length and 15 cm in diameter with the intention to provide a comprehensive data base for the improvement and validation of existing reaction simulation codes. (author)

  4. The conversion of the DIDO-type reactor FRJ-2. Studies and conclusions

    Stroemich, A.; Siebertz, Ch.; Wickert, M.

    1985-01-01

    For the FRJ-2 (23 MW) of the KFA-Juelich the conversion from HEU- to LEU-fuel was investigated. Before starting the conversion calculations our methods were qualified for the application to heavy water moderated research reactors. A combination of LEU-elements with two different U-235 loadings of 180 g and 225 g was found as suitable for conversion. With these LEU-elements a working core and a transition phase was calculated. The change of the mechanical fuel element design was taken into account. (author)

  5. Ways of transition to clean energy use: two methodological approaches

    Belyaev, L.S.; Kaganovich, B.M.; Krutov, A.N.; Filippov, S.P.; Martinsen, D.; Mueller, M.; Wagner, H.J.; Walbeck, M.

    1987-01-01

    Studies of the Siberian Energy Institute, Irkutsk, and the Nuclear Research Center, Juelich, carried out with the aid of complex computer models, demonstrate the opportunities of novel integrated energy systems in a future, clean energy supply. As conditions differ widely in different regions and different countries, there will of course be a wide structural variety in the realization of integrated energy systems. The studies of SEI and KFA, based on the cooperation with the International Institute of Applied System Analysis (IIASA), emphasize the common viewpoint that the idea of integrated energy systems constitutes an essential basis for future studies on 'energy in a finite environment'. (Author)

  6. B2-B2.5 code benchmarking

    Dekeyser, W.; Baelmans, M; Voskoboynikov, S.; Rozhansky, V.; Reiter, D.; Wiesen, S.; Kotov, V.; Boerner, P.

    2011-01-15

    ITER-IO currently (and since about 15 years) employs the SOLPS4.xxx code for its divertor design, currently version SOLPS4.3. SOLPS.xxx is a special variant of the B2-EIRENE code, which was originally developed by an European consortium (FZ Juelich, AEA Culham, ERM Belgium/KU Leuven) in the late eighties and early nineties of the last century under NET contracts. Until today even the very similar edge plasma codes within the SOLPS family, if run on a seemingly identical choice of physical parameters, still sometimes disagree significantly with each other. It is obvious that in computational engineering applications, as they are carried out for the various ITER divertor aspects with SOLPS4.3 for more than a decade now, any transition from one to another code must be fully backward compatible, or, at least, the origin of differences in the results must be identified and fully understood quantitatively. In this report we document efforts undertaken in 2010 to ultimately eliminate the third issue. For the kinetic EIRENE part within SOLPS this backward compatibility (back until 1996) was basically achieved (V. Kotov, 2004-2006) and SOLPS4.3 is now essentially up to date with the current EIRENE master maintained at FZ Juelich. In order to achieve a similar level of reproducibility for the plasma fluid (B2, B2.5) part, we follow a similar strategy, which is quite distinct from the previous SOLPS benchmark attempts: the codes are ''disintegrated'' and pieces of it are run on smallest (i.e. simplest) problems. Only after full quantitative understanding is achieved, the code model is enlarged, integrated, piece by piece again, until, hopefully, a fully backward compatible B2 / B2.5 ITER edge plasma simulation will be achieved. The status of this code dis-integration effort and its findings until now (Nov. 2010) are documented in the present technical note. This work was initiated in a small workshop by the three partner teams of KU Leuven, St. Petersburg

  7. Attenuation correction for hybrid MR/PET scanners: a comparison study

    Rota Kops, Elena; Ribeiro, Andre Santos; Caldeira, Liliana; Hautzel, Hubertus; Lukas, Mathias; Antoch, Gerald; Lerche, Christoph; Shah, Jon

    2015-01-01

    Attenuation correction of PET data acquired in hybrid MR/PET scanners is still a challenge. Different methods have been adopted by several groups to obtain reliable attenuation maps (mu-maps). In this study we compare three methods: MGH, UCL, Neural-Network. The MGH method is based on an MR/CT template obtained with the SPM8 software. The UCL method uses a database of MR/CT pairs. Both generate mu-maps from MP-RAGE images. The feed-forward neural-network from Juelich (NN-Juelich) requires two UTE images; it generates segmented mu-maps. Data from eight subjects (S1-S8) measured in the Siemens 3T MR-BrainPET scanner were used. Corresponding CT images were acquired. The resulting mu-maps were compared against the CT-based mu-maps for each subject and method. Overlapped voxels and Dice similarity coefficients, D, for bone, soft-tissue and air regions, and relative differences images were calculated. The true positive (TP) recognized voxels for the whole head were 79.9% (NN-Juelich, S7) to 92.1% (UCL method, S1). D values of the bone were D=0.65 (NN-Juelich, S1) to D=0.87 (UCL method, S1). For S8 the MHG method failed (TP=76.4%; D=0.46 for bone). D values shared a common tendency in all subjects and methods to recognize soft-tissue as bone. The relative difference images showed a variation of -10.9% - +10.1%; for S8 and MHG method the values were -24.5% and +14.2%. A preliminary comparison of three methods for generation of mu-maps for MR/PET scanners is presented. The continuous methods (MGH, UCL) seem to generate reliable mu-maps, whilst the binary method seems to need further improvement. Future work will include more subjects, the reconstruction of corresponding PET data and their comparison.

  8. Incineration plant for low active waste at Inshass, LAWI

    Krug, W.; Thoene, L.; Schmitz, H.J.; Abdelrazek, I.D.

    1993-10-01

    The LAWI (Low Active Waste Incinerator) prototype incinerating plant was devised and constructed according to the principle of the Juelich thermoprocess and installed at the Egyptian research centre Inshass. In parallel, AEA Cairo devised and constructed their own operations building for this plant with all the features, infrastructural installations and rooms required for operating the plant and handling and treating low-level radioactive wastes. The dimensions of this incinerator were selected so as to be sufficient for the disposal of solid, weakly radioactive combustible wastes from the Inshass Research Centre and the environment (e.g. Cairo hospitals). (orig./DG) [de

  9. HET/JUPITER project assessment report

    Baxter, B.J.; Harrington, F.E.; Kaiser, G.G.; Wolf, J.

    1979-05-01

    This report is an assessment of the United States' Hot Engineering Test (HET) and the Federal Republic of Germany's Juelich Pilot Plant Thorium Element Reprocessing (JUPITER) Projects. The assessment was conducted with a view to developing mutually supportive roles in the achievement of hot engineering test objectives. Conclusions of the assessment are positive and identify several technical areas with potential for US/FRG cooperation. Recommendations presented in this report support a cost-effective US/FRG program to jointly develop high temperature gas-cooled reactor fuel recycle technology. (orig.) [de

  10. Thermochemical hydrogen production studies at LLNL: a status report

    Krikorian, O.H.

    1982-01-01

    Currently, studies are underway at the Lawrence Livermore National Laboratory (LLNL) on thermochemical hydrogen production based on magnetic fusion energy (MFE) and solar central receivers as heat sources. These areas of study were described earlier at the previous IEA Annex I Hydrogen Workshop (Juelich, West Germany, September 23-25, 1981), and a brief update will be given here. Some basic research has also been underway at LLNL on the electrolysis of water from fused phosphate salts, but there are no current results in that area, and the work is being terminated

  11. Models and criteria for prediction of Deflagration-to-Detonation Transition (DDT) in hydrogen-air-steam systems under severe accident conditions. Final report

    Klein, R.; Rehm, W.

    1999-01-01

    The European Commission in Brussels supported a joint project on Deflagration-to-Detonation Transition (DDT) studies for hydrogen safety within the framework programme on nuclear fission safety. The project was initiated by the Forschungszentrum Juelich based on the results of a pilot project. The following main project was coordinated by the Freie Universitaet Berlin involving seven european partners. The partners came from universities, research centers and industry, as follows: FU-Berlin, RWTH-Aachen, CNRS-Marseille, IPSN-Saclay, FZ-Juelich, FZ-Karlsruhe, and NNC-Knutsford, which worked closely together. The working period was two years (1997-1998). The aim of the project was to develop models and criteria for prediction of deflagration-to-detonation transition (DDT) in hydrogen-air-steam systems under severe accident conditions. The results obtained are documented in this final report, which was finished in 1999. The report consists of seven chapters, concerning: - Introduction - Experimental Investigations - Modelling and Numerics - Validation - Mitigation - Further Deliverables - Summary and Conclusion. The final report presents special experimental, theoretical, and computational aspects of the complex DDT phenomena for hydrogen safety studies, and it should be a solid basis for end user applications and further developments. (orig.)

  12. ENSTAR detector: fabrication and test measurement

    Shukla, P.; Jha, V.; Roy, B.J.; Chatterjee, A.; Machner, H.; Biswas, P.K.; Guha, S.; Jawale, S.B.; Panse, H.B.; Balasubramanian, R.

    2003-07-01

    A large acceptance plastic scintillator detector ENSTAR has been designed and built at BARC, Mumbai. The detector will be used for studies of a new type of nuclear matter- the η-mesic nucleus, at the multi-GeV hadron facility COSY (COoler SYnchrotron), Juelich, Germany. The ENSTAR design has been optimized for detecting decay products of eta-nucleus bound state (η-mesic nucleus), namely protons and pions. However, it can also be used in other experiments whereever missing mass determination in a reaction has to be done in coincidence with decay products. The detector is made of plastic scintillators arranged in three concentric cylindrical layers. These layers will be used to generate ΔE - E spectra for particle identification and total energy information for the stopped particles. Each layer is sub-divided into a number of pieces to obtain θ and φ information. The scintillator read-out is made through state-of-the-art fiber optic technique. The present report describes fabrication details such as machining the scintillators, polishing the scintillators and the fibers and coupling the fibers with scintillators and photomultiplier tubes. Test measurements have been performed with proton beam from the COSY accelerator at Juelich, the results of which are reported. (author)

  13. High heat flux components with Be armour before and after neutron irradiation

    Lodato, A.; Derz, H.; Duwe, R.; Linke, J.; Roedig, M.

    2000-01-01

    Beryllium/copper mock-ups produced by different joining techniques have been tested in the electron beam facility JUDITH (Juelich Divertor Test Facility in Hot Cells) at Forschungszentrum Juelich. The experiments described in this paper represent the conclusive part of a test program started in 1994. The properties of non-irradiated Be/Cu joints have been characterised in a previous test campaign. Post-irradiation tests are now being carried out to investigate the neutron damage on the joints. The neutron irradiation on selected mock-ups has been carried out in the High Flux Reactor (HFR) at Petten (The Netherlands). Parametric finite element thermal analyses have been carried out to establish the allowable heat flux value to be applied during the tests. Screening tests up to power densities of ∼7 MW/m 2 and thermal fatigue tests up to 1000 cycles have been performed. None of these mock-ups showed any indication of failure. Post-mortem analyses (metallography, SEM) have also been conducted

  14. Developments for the TOF Straw Tracker

    Ucar, A.

    2006-07-01

    COSY-TOF is a very large acceptance spectrometer for charged particles using precise information on track geometry and time of flight of reaction products. It is an external detector system at the Cooler Synchrotron and storage ring COSY in Juelich. In order to improve the performance of the COSY-TOF, a new tracking detector ''Straw Tracker'' is being constructed which combines very low mass, operation in vacuum, very good resolution, high sampling density and very high acceptance. A comparison of pp{yields}d{pi}{sup +} data and a simulation using the straw tracker with geometry alone indicates big improvements with the new tracker. In order to investigate the straw tracker properties a small tracking hodoscope ''cosmic ray test facility'' was constructed in advance. It is made of two crossed hodoscopes consisting of 128 straw tubes arranged in 4 double planes. For the first time Juelich straws have been used for 3 dimensional reconstruction of cosmic ray tracks. In this illuminating field the space dependent response of scintillators and a straw tube were studied. (orig.)

  15. The general concept for a spallation neutron source in the Federal Republic of Germany

    Bauer, G.S.

    1982-01-01

    In a collaborative effort between the two German nuclear research centres at Karlsruhe and at Juelich, a reference concept for a spallation neutron source has been studied which would be suitable to satisfy the medium term needs in neutrons for fundamental research and to serve a large number of other scientific disciplines as well. The reference facility, consisting of a high power proton linac for 5 mA time average current of 1.1 GeV protons and a rotating lead target with hybrid H 2 O-D 2 O moderators can deliver a thermal neutron flux equivalent to 7 x 10 14 cm -2 s -1 at the beam tube noses. Pulsed operation of the accelerator results in an intensity modulation of this flux at a repitition rate of 100 Hz with a peak flux of 1.3 x 10 16 cm -2 s -1 and a pulse width of 510 μs. Further possible improvements were considered, consisting in the use of uranium as target material and in the addition of a proton pulse compressor to increase the neutron peak flux especially in the epithermal energy range and to provide a time structure suitable for neutrino and muon research. To realize this concept in a fashion compatible with existing constraints while still serving a maximum number of users at the earliest possible date, a staged concept is being considered by KFA Juelich. (orig.) [de

  16. Developments for the TOF Straw Tracker

    Ucar, A.

    2006-01-01

    COSY-TOF is a very large acceptance spectrometer for charged particles using precise information on track geometry and time of flight of reaction products. It is an external detector system at the Cooler Synchrotron and storage ring COSY in Juelich. In order to improve the performance of the COSY-TOF, a new tracking detector ''Straw Tracker'' is being constructed which combines very low mass, operation in vacuum, very good resolution, high sampling density and very high acceptance. A comparison of pp→dπ + data and a simulation using the straw tracker with geometry alone indicates big improvements with the new tracker. In order to investigate the straw tracker properties a small tracking hodoscope ''cosmic ray test facility'' was constructed in advance. It is made of two crossed hodoscopes consisting of 128 straw tubes arranged in 4 double planes. For the first time Juelich straws have been used for 3 dimensional reconstruction of cosmic ray tracks. In this illuminating field the space dependent response of scintillators and a straw tube were studied. (orig.)

  17. Conceptual design of a cold methane moderator system for the European Spallation Source (ESS)

    Barnert-Wiemer, H.

    2002-02-01

    As part of the work for the target station of the planned European spallation source (ESS) the Central Department of Technology at the Forschungszentrum Juelich GmbH is also concerned with the moderators, particular attention being given to the development of cold methane moderators. This report discusses the technical feasibility of solid methane moderators. Methods to tailor the neutron output by adding absorption materials (decouplers or poisons) are not considered here, neither are composite moderators. Based on the given target-moderator-reflector assembly of the ESS project a concept for the ESS cold methane moderators has been developed and is being examined at the Forschungszentrum Juelich. According to this moderator concept the moderator is a fixed bed of small spheres, which makes moderator container filling homogeneous and reproducible. Since spheres form a defined packed bed, cooling of the moderator bed by H 2 is reliable. The process of filling the moderator container and of removing the pellets is batchwise to ensure complete removal of the pellets, so that no spent methane pellets accumulate in the system. For removal of the moderator spheres the fixed bed in the moderator container is fluidized with subsequent hydraulic transport of the pellets. The spent methane pellets are separated from the transport fluid and the methane is released over the stack or purified and reused. Depending on the kind and amount of the radioactive isotopes present these may have to be separated and stored. (orig.)

  18. BIG KARL and COSY: Examples for high performance magnet design taught by {open_quotes}Papa Klaus{close_quotes}

    Bechtstedt, U.; Hacker, U.; Maier, R.; Martin, S. [Institut fuer Kernphysik, Juelich (Germany); Berg, G.P.A. [Indiana Univ. Cyclotron Facility, Bloomington, IN (United States); Hardt, A. [Fachhochschule Aachen Juelich (Germany); Huerlimann, W. [Power Consulting Ltd., Baden (Switzerland); Meissburger, J. [Institut fuer angewandte Mathematik, Juelich (Germany); Roemer, J.G.M. [Leybold-Heraeus GmbH, Koeln (Germany)] [and others

    1995-02-01

    The past decades have seen a tremendous development in nuclear, middle, and high energy physics. This advance was in a great part promoted by the availability of newer and more powerful instruments. Over time, these instruments grew in size as well as in sophistication and precision. Nearly all these devices had one fundamental thing in common - magnetic fields produced with currents and iron. The precision demanded by the new experiments and machines did bring the magnet technology to new frontiers requiring the utmost in the accuracy of magnetic fields. The complex properties of the iron challenged innumerable physicists in the attempt to force the magnetic fields into the desired shape. Experience and analytical insight were the pillars for coping with those problems and only few mastered the skills and were in addition able to communicate their intricate knowledge. It was a fortuitous situation that the authors got to know Klaus Halbach who belonged to those few and who shared his knowledge contributing thus largely to the successful completion of two large instruments that were built at the Forschungszentrum Juelich, KFA, for nuclear and middle energy physics. In one case the efforts went to the large spectrometer named BIG KARL whose design phase started in the early 70`s. In the second case the work started in the early 80`s with the task to build a high precision 2.5 GeV proton accelerator for cooled stored and extracted beams known as COSY-Juelich.

  19. German neutron scattering conference. Programme and abstracts

    Brueckel, Thomas (ed.)

    2012-07-01

    The German Neutron Scattering Conference 2012 - Deutsche Neutronenstreutagung DN 2012 offers a forum for the presentation and critical discussion of recent results obtained with neutron scattering and complementary techniques. The meeting is organized on behalf of the German Committee for Research with Neutrons - Komitee Forschung mit Neutronen KFN - by the Juelich Centre for Neutron Science JCNS of Forschungszentrum Juelich GmbH. In between the large European and international neutron scattering conferences ECNS (2011 in Prague) and ICNS (2013 in Edinburgh), it offers the vibrant German and international neutron community an opportunity to debate topical issues in a stimulating atmosphere. Originating from ''BMBF Verbundtreffen'' - meetings for projects funded by the German Federal Ministry of Education and Research - this conference series has a strong tradition of providing a forum for the discussion of collaborative research projects and future developments in the field of research with neutrons in general. Neutron scattering, by its very nature, is used as a powerful probe in many different disciplines and areas, from particle and condensed matter physics through to chemistry, biology, materials sciences, engineering sciences, right up to geology and cultural heritage; the German Neutron Scattering Conference thus provides a unique chance for exploring interdisciplinary research opportunities. It also serves as a showcase for recent method and instrument developments and to inform users of new advances at neutron facilities.

  20. Demolition to Green-Field conditions of the FRJ-1 (MERLIN) research reactor. Successes and hurdles in the demolition of a research reactor of the megawatt class; Der Rueckbau des Forschungsreaktors FRJ-1 (MERLIN) bis zur 'Gruenen Wiese'. Erfolge und Huerden beim Rueckbau eines Forschungsreaktors der Megawatt-Klasse

    Stahn, Burkhard; Printz, Rudolf; Matela, Karel; Zehbe, Carsten; Stauch, Bernhard; Zander, Iven [Forschungszentrum Juelich GmbH, Juelich (Germany)

    2010-02-15

    The Juelich-1 Research Reactor (FRJ-1), also referred to as MERLIN (Medium Energy Research Light Water Moderated Industrial Nuclear Reactor), was a light-water moderated and cooled swimming pool reactor of British design. The cornerstone in the erection of the reactor building was laid on June 11, 1958. Reactor operation was started on February 23, 1962. The plant was last run at a thermal power of 10 MW and shut down for good in 1985 after 23 years of operation. After the fuel elements had been removed and most of the experimental installations dismantled, some first steps towards demolition were taken in 1995. Demolition on a large scale began in 1996. September 8, 2008 was a special day: On the area of the former reactor hall, an oak tree was planted as a symbol of the 'green field' and of the original oak wood which had to make way for the construction of reactors in Juelich. An oak tree now stands in the place of the reactor unit. Was that all? It was not, for there were ancillary systems, operations, utility and hygiene buildings which had to be pulled down. Decontamination and clearance measurements were completed. The application for clearance was prepared and completed. Conventional demolition was started in 2009. After completion of that step, the last chapter about demolition of the FRJ-1 research reactor has been written, and the book can be closed. (orig.)

  1. Tightening the Reins. Towards a strengthened international nuclear safeguards system. Final report

    Haeckel, E.; Stein, G.

    1999-12-01

    This book has grown out of a research project dealing with political and technical challenges to international nuclear material and technology controls. The project, which was carried out in the period 1997-1999, was made possible through financial support from the Federal Ministry of Education, Science, Research and Technology and, after reorganization of the German Government following the September 1998 elections, from the Federal Ministry of Economics and Technology. Our research project was a co-operative effort linked to a joint Working Group on Nuclear Nonproliferation, sponsored by the German Society for Foreign Affairs (DGAP, Berlin) in collaboration with the Research Centre Juelich (FZJ, Juelich). The working group, a long-standing institution under the chairmenship of Professors Wolf Haefele and Karl Kaiser, is a unique undertaking for the purpose of continuous information exchange, intellectual debate and political consensus formation on all aspects of German nuclear nonproliferation policy. Members of the group comprise leading experts and decision-makers from government and politics, the natural and social sciences, engineering and nuclear industrial enterprises, as well as mass media and the specialized press. Many among them have shaped and executed the Federal Republic's nuclear policies in a variety of responsible positions. (orig.)

  2. The NOKO/TOPFLOW facility for natural convection flow

    Hicken, E.F.; Jaegers, H.; Schaffrath, A.; Weiss, F.-P.

    2002-01-01

    For the study of the effectiveness of passive safety systems a high pressure (up to 7 MPa) and high power (up to 4 MW) test facility - named NOKO - has been constructed and operated at the Forschungszentrum Juelich. From 1996-1998 this facility was used for a project within the 4th FP of the EU 'European BWR R and D Cluster for Innovative Passive Safety Systems'. An overview and selected results are given for the tests with two bundles of the emergency condenser, with the building and plate condenser, with 4 different passive initiators, with a passive flooding system and with decay heat removal tests during shutdown. It has been decided to decrease substantially the safety research at the Forschungszentrum Juelich; to maintain the experimental competence for two-phase flow the NOKO facility will be transferred to the Forschungszentrum Rossendorf by the end of the year 2000 up to the beginning of the year 2001. The facility will be named TOPFLOW; the main objectives of future tests will be oriented towards more generic research: investigation of steady state and transient two-phase flow phenomena especially transient two-phase flow patterns, the development of two-phase flow instrumentation, the generation of a data basis for Computational Fluid Dynamic (CFD)-Code validation and testing of heat exchangers and safety systems. An overview will be given about the modifications and improvements related to the test facility and the planned tests. (author)

  3. German neutron scattering conference. Programme and abstracts

    Brueckel, Thomas

    2012-01-01

    The German Neutron Scattering Conference 2012 - Deutsche Neutronenstreutagung DN 2012 offers a forum for the presentation and critical discussion of recent results obtained with neutron scattering and complementary techniques. The meeting is organized on behalf of the German Committee for Research with Neutrons - Komitee Forschung mit Neutronen KFN - by the Juelich Centre for Neutron Science JCNS of Forschungszentrum Juelich GmbH. In between the large European and international neutron scattering conferences ECNS (2011 in Prague) and ICNS (2013 in Edinburgh), it offers the vibrant German and international neutron community an opportunity to debate topical issues in a stimulating atmosphere. Originating from ''BMBF Verbundtreffen'' - meetings for projects funded by the German Federal Ministry of Education and Research - this conference series has a strong tradition of providing a forum for the discussion of collaborative research projects and future developments in the field of research with neutrons in general. Neutron scattering, by its very nature, is used as a powerful probe in many different disciplines and areas, from particle and condensed matter physics through to chemistry, biology, materials sciences, engineering sciences, right up to geology and cultural heritage; the German Neutron Scattering Conference thus provides a unique chance for exploring interdisciplinary research opportunities. It also serves as a showcase for recent method and instrument developments and to inform users of new advances at neutron facilities.

  4. Baryon resonances in pion- and photon-induced hadronic reactions

    Roenchen, Deborah

    2014-01-01

    The aim of the present work is the analysis of the baryon spectrum in the medium-energy regime. At those energies, a perturbative treatment of Quantum Chromodynamics, that is feasible in the high-energy regime, is not possible. Chiral perturbation theory, the low-energy effective theory of the strong interaction, is limited to the lowest excited states and does not allow to analyze the complete resonance region. For the latter purpose, dynamical coupled-channel approaches provide an especially suited framework. In the present study, we apply the Juelich model, a dynamical coupled-channel model developed over the years, to analyze pion- and photon-induced hadronic reactions in a combined approach. In the Juelich model, the interaction of the mesons and baryons is built of t- and u-channel exchange diagrams based on an effective Lagrangian. Genuine resonances are included as s-channel states. The scattering potential is unitarized in a Lippmann-Schwinger-type equation. Analyticity is preserved, which is a prerequisite for a reliable extraction of resonance parameters in terms of pole positions and residues in the complex energy plane. Upon giving an introduction to the subject in Chap. 1 and showing selected results in Chap. 2, we will describe the simultaneous analysis of elastic πN scattering and the reactions π - p → ηn, K 0 Λ, K + Σ - , K 0 Σ 0 and π + p→K + Σ + within the Juelich framework in Chap. 3. The free parameters of the model are adjusted to the GWU/SAID analysis of elastic πN scattering and, in case of the inelastic reactions, to experimental data. Partial waves up to J=9/2 are included and we consider the world data set from threshold up to E∝2.3 GeV. We show our fit results compared to differential and total cross sections, to polarizations and to measurements of the spin-rotation parameter. Finally, we present the results of a pole search in the complex energy plane of the scattering amplitude and discuss the extracted resonance

  5. Association EURATOM-FZJ. Annual progress report 2011. SC-FZJ 88(12)/4.1.2

    2011-01-01

    Forschungszentrum Juelich (FZJ) as a EURATOM Association coordinates its fusion research activities within the Nuclear Fusion Project (KFS). The programme is based on several insti-tutes and is well embedded into the European fusion research structure. The major part of the Juelich research activities is located within the Institute of Energy and Climate Research (IEK). This is organized along a number of institute parts, among which fusion research is concentrat-ed within IEK-4 Plasma Physics - the former Institute for Plasma Physics IPP- and IEK-2 Microstructure and Properties of Materials. The IEK-4 Plasma Physics has the largest share of scientific staff in physics and technology for fusion, operates the TEXTOR tokamak, performs scientific work on JET and DIII-D, supports the Wendelstein 7-X construction and takes up significant projects related to the development of ITER. IEK-2 operates the high heat flux test facilities JUDITH 1 and 2 which are installed inside a hot cell and in a controlled area which is licensed to operate with toxic and radiating materials; this group represents the materials science expertise within the Juelich fusion pro-gramme. The Central Technology Division (ZAT) provides engineering expertise and specialised workshop capacities. The Juelich Supercomputing Centre (JSC) operates various types of supercomputer systems, among which one device (HPC-FF) is dedicated exclusively to fusion research within EFDA. The Association EURATOM-FZJ has very close contacts to the neighbouring EURATOM associations in Belgium and The Netherlands. In 1996 they together have founded the Trilat-eral Euregio Cluster (TEC) which provides a clustering of resources in order to perform a co-ordinated R and D programme, to operate or construct large facilities (TEXTOR, MAGNUM-PSI), to combine different kinds of expertise and to allow for the forming of a strong partner-ship as a consortium within the ITER construction phase. An updated TEC agreement with a strong

  6. Association EURATOM-FZJ. Annual progress report 2013. SC-FZJ-92-(14)-4.1.3

    2013-01-01

    The Helmholtz Association's (HGF) fusion activities are in line with the European fusion re-search programme. The following Helmholtz Centres are involved: Max Planck Institute of Plasma Physics (IPP, Garching and Greifswald), Karlsruhe Institute of Technology (KIT), and Forschungszentrum Juelich (FZJ). This report presents results having been achieved by FZJ during the final year of the Association (2013). Forschungszentrum Juelich coordinates its fusion research activities within several institutes and is well embedded into the European fusion research structures, the work programme of which is oriented along the European Road Map for the Realization of Fusion Electricity. The major part of the Juelich research activities is located within the Institute of Energy and Climate Research (IEK). This is organized along a number of institute parts, among which fusion research is concentrated within IEK-Plasma Physics and IEK-Microstructure and Properties of Materials. The IEK-Plasma Physics has the largest share of scientific staff in physics and technology for fusion, operated the TEXTOR tokamak, performs scientific work on JET and DIII-D, supports the Wendelstein 7-X construction and takes up significant projects related to the development of ITER. The appointment in 2012 of a new second director at IEK-4 (Prof. Linsmeier) strengthens in particular the materials science expertise within the Juelich fusion programme. This will complement the activities which are based on the operation of the high heat flux test facilities JUDITH 1 and 2. They are installed inside a Hot Cell and in a controlled area which are licensed for operating with toxic and radiating materials. The Association EURATOM-FZJ has very close contacts to the neighbouring EURATOM associations in Belgium and The Netherlands. In 1996 together they have founded the Trilateral Euregio Cluster (TEC) which provides a clustering of resources in order to perform a co-ordinated R and D programme, to operate

  7. Association EURATOM-FZJ. Annual progress report 2013. SC-FZJ-92-(14)-4.1.3

    NONE

    2013-07-01

    The Helmholtz Association's (HGF) fusion activities are in line with the European fusion re-search programme. The following Helmholtz Centres are involved: Max Planck Institute of Plasma Physics (IPP, Garching and Greifswald), Karlsruhe Institute of Technology (KIT), and Forschungszentrum Juelich (FZJ). This report presents results having been achieved by FZJ during the final year of the Association (2013). Forschungszentrum Juelich coordinates its fusion research activities within several institutes and is well embedded into the European fusion research structures, the work programme of which is oriented along the European Road Map for the Realization of Fusion Electricity. The major part of the Juelich research activities is located within the Institute of Energy and Climate Research (IEK). This is organized along a number of institute parts, among which fusion research is concentrated within IEK-Plasma Physics and IEK-Microstructure and Properties of Materials. The IEK-Plasma Physics has the largest share of scientific staff in physics and technology for fusion, operated the TEXTOR tokamak, performs scientific work on JET and DIII-D, supports the Wendelstein 7-X construction and takes up significant projects related to the development of ITER. The appointment in 2012 of a new second director at IEK-4 (Prof. Linsmeier) strengthens in particular the materials science expertise within the Juelich fusion programme. This will complement the activities which are based on the operation of the high heat flux test facilities JUDITH 1 and 2. They are installed inside a Hot Cell and in a controlled area which are licensed for operating with toxic and radiating materials. The Association EURATOM-FZJ has very close contacts to the neighbouring EURATOM associations in Belgium and The Netherlands. In 1996 together they have founded the Trilateral Euregio Cluster (TEC) which provides a clustering of resources in order to perform a co-ordinated R and D programme, to operate

  8. Institute of Energy and Climate Research IEK-6. Nuclear waste management and reactor safety report 2009/2010. Material science for nuclear waste management

    Klinkenberg, M.; Neumeier, S.; Bosbach, D. (eds.)

    2011-07-01

    Due to the use of nuclear energy about 17.000 t (27.000 m{sup 3}) of high level waste and about 300.000 m{sup 3} of low and intermediated level waste will have accumulated in Germany until 2022. Research in the Institute of Energy and Climate Research (IEK-6), Nuclear Waste Management and Reactor Safety Division focuses on fundamental and applied aspects of the safe management of nuclear waste - in particular the nuclear aspects. In principle, our research in Forschungszentrum Juelich is looking at the material science/solid state aspects of nuclear waste management. It is organized in several research areas: The long-term safety of nuclear waste disposal is a key issue when it comes to the final disposal of high level nuclear waste in a deep geological formation. We are contributing to the scientific basis for the safety case of a nuclear waste repository in Germany. In Juelich we are focusing on a fundamental understanding of near field processes within a waste repository system. The main research topics are spent fuel corrosion and the retention of radionuclides by secondary phases. In addition, innovative waste management strategies are investigated to facilitate a qualified decision on the best strategy for Germany. New ceramic waste forms for disposal in a deep geological formation are studied as well as the partitioning of long-lived actinides. These research areas are supported by our structure research group, which is using experimental and computational approaches to examine actinide containing compounds. Complementary to these basic science oriented activities, IEK-6 also works on rather applied aspects. The development of non-destructive methods for the characterisation of nuclear waste packages has a long tradition in Juelich. Current activities focus on improving the segmented gamma scanning technique and the prompt gamma neutron activation analysis. Furthermore, the waste treatment group is developing concepts for the safe management of nuclear

  9. Proceedings of the international meeting on research and test reactor core conversions from HEU to LEU fuels

    Travelli, A.

    1983-09-01

    Conversion of research and test reactor cores from the use of high enrichment uranium to the use of low enrichment uranium depends on the cooperation of many research organizations, reactor operators, and government agencies. At a technical level, it involves almost all aspects of the fuel cycle, including fuel development, testing, shipping and reprocessing; experiment performance; economics; and safety and licensing aspects. The reactors involved and the conversion activities are distributed among approximately 25 countries, making this a subject which is best dealt with on an international basis. To foster direct communication in this area, the Reduced Enrichment Research and Test Reactor (RERTR) Program, at the Argonne National Laboratory, sponsored this meeting as the fifth of a series which began in 1978. The previous meetings were held at Argonne (International Meeting of Research Reactor Fuel Designers, Developers, and Fabricators, Argonne National Laboratory, Argonne, U.S.A., November 910, 1978), at Saclay (IAEA Consultants' Meeting on Research Reactor Core Conversions from HEU to LEU, Centre d'etudes Nucleaires de Saclay, Saclay, France, December 12-14, 1979), at Argonne (International Meeting on Development, Fabrication and Application of Reduced Enrichment Fuels for Research and Test Reactors, Argonne National Laboratory, Argonne, U.S.A., November 12-14, 1980) and at Juelich (Seminar on Research Reactor Operation and Use, Juelich Nuclear Research Center, Juelich, F.R.G., September 48, 1981). Proceedings from the two most recent previous meetings were published as ANL/RERTR/TM-3 (CONF-801144) and IAEA-SR-77. The spirit of this meeting differs slightly from that of the previous meetings. The advances which have been made and the growing maturity of the effort have caused a gradual shift of emphasis away from those topics which dominated the floor during the first meetings, such as fuel and methods development, and towards topics which concern more

  10. Proceedings of the international meeting on research and test reactor core conversions from HEU to LEU fuels

    Travelli, A [Argonne National Laboratory, Argonne, IL (United States)

    1983-09-01

    Conversion of research and test reactor cores from the use of high enrichment uranium to the use of low enrichment uranium depends on the cooperation of many research organizations, reactor operators, and government agencies. At a technical level, it involves almost all aspects of the fuel cycle, including fuel development, testing, shipping and reprocessing; experiment performance; economics; and safety and licensing aspects. The reactors involved and the conversion activities are distributed among approximately 25 countries, making this a subject which is best dealt with on an international basis. To foster direct communication in this area, the Reduced Enrichment Research and Test Reactor (RERTR) Program, at the Argonne National Laboratory, sponsored this meeting as the fifth of a series which began in 1978. The previous meetings were held at Argonne (International Meeting of Research Reactor Fuel Designers, Developers, and Fabricators, Argonne National Laboratory, Argonne, U.S.A., November 910, 1978), at Saclay (IAEA Consultants' Meeting on Research Reactor Core Conversions from HEU to LEU, Centre d'etudes Nucleaires de Saclay, Saclay, France, December 12-14, 1979), at Argonne (International Meeting on Development, Fabrication and Application of Reduced Enrichment Fuels for Research and Test Reactors, Argonne National Laboratory, Argonne, U.S.A., November 12-14, 1980) and at Juelich (Seminar on Research Reactor Operation and Use, Juelich Nuclear Research Center, Juelich, F.R.G., September 48, 1981). Proceedings from the two most recent previous meetings were published as ANL/RERTR/TM-3 (CONF-801144) and IAEA-SR-77. The spirit of this meeting differs slightly from that of the previous meetings. The advances which have been made and the growing maturity of the effort have caused a gradual shift of emphasis away from those topics which dominated the floor during the first meetings, such as fuel and methods development, and towards topics which concern more

  11. Radiation resistant and decontaminable coatings for shipping, interim storage and repository storage casks containing radioactive wastes

    Kunze, S.

    1995-02-01

    All the Corrobesch-DF-Nukelar coatings - black, yellow, blue, red and white - have been excellently decontaminable without and after radiation exposure with 3x10 5 Gy, despite the slightly higher absorbed dose rate applied at KFA Juelich (DIN 55 991 requires ≤1.0 KGy/h). After a further increase to 3x10 6 Gy in the absorbed dose, with an absorbed dose rate up to 1.0 KGy/h conforming to the standard, the coatings black, yellow, blue were still excellent in their decontamination behavior. After exposure to 10 7 Gy all coatings irradiated at Gammaster in their irradiation room (150 m 3 ) with permanent air changes and at absorbed dose rates of 0.9-1.0 KGy/h have been well decontaminable, and the coatings irradiated at KFA Juelich in the 10 l vessel with discontinuous air changes and variable absorbed dose rate (0.22-2.7 KGy/h) have still been fairly well decontaminable only. To be able to evaluate possible changes occurring upon 10 7 Gy radiation exposure, the test specimens were exposed to the action of chemicals according to DIN 55 991 as well as to decontamination cleansing solutions. Different discolorations, very small reductions in brilliancy, and sometimes minor deteriorations in surface hardness occurred. Detrimental visible changes, e.g. bubble and crack formation, swelling, detachment from the base, etc., have not been found for any of the coatings. These results for the test specimens irradiated at Gammaster are identical with the results for the test specimens irradiated at KFA Juelich, except minor deviations. Contrary to expectations, Corrobesch-DF-Nuklear has proved to be a coating material, which, although it consists of organic base material, nevertheless tolerates radiation exposures without visible damage, i.e. conditions under which only electrodeposited nickel coatings have appeared appropriate until now. This means that application of Corrobesch-Nuklear-DF allows the costs of coating of fuel element shipping and storage casks to be reduced

  12. Institute of Energy and Climate Research IEK-6. Nuclear waste management and reactor safety report 2009/2010. Material science for nuclear waste management

    Klinkenberg, M.; Neumeier, S.; Bosbach, D.

    2011-01-01

    Due to the use of nuclear energy about 17.000 t (27.000 m 3 ) of high level waste and about 300.000 m 3 of low and intermediated level waste will have accumulated in Germany until 2022. Research in the Institute of Energy and Climate Research (IEK-6), Nuclear Waste Management and Reactor Safety Division focuses on fundamental and applied aspects of the safe management of nuclear waste - in particular the nuclear aspects. In principle, our research in Forschungszentrum Juelich is looking at the material science/solid state aspects of nuclear waste management. It is organized in several research areas: The long-term safety of nuclear waste disposal is a key issue when it comes to the final disposal of high level nuclear waste in a deep geological formation. We are contributing to the scientific basis for the safety case of a nuclear waste repository in Germany. In Juelich we are focusing on a fundamental understanding of near field processes within a waste repository system. The main research topics are spent fuel corrosion and the retention of radionuclides by secondary phases. In addition, innovative waste management strategies are investigated to facilitate a qualified decision on the best strategy for Germany. New ceramic waste forms for disposal in a deep geological formation are studied as well as the partitioning of long-lived actinides. These research areas are supported by our structure research group, which is using experimental and computational approaches to examine actinide containing compounds. Complementary to these basic science oriented activities, IEK-6 also works on rather applied aspects. The development of non-destructive methods for the characterisation of nuclear waste packages has a long tradition in Juelich. Current activities focus on improving the segmented gamma scanning technique and the prompt gamma neutron activation analysis. Furthermore, the waste treatment group is developing concepts for the safe management of nuclear graphite

  13. Main Achievements 2003-2004 - Nuclear Physics

    2005-01-01

    Two Departments of our Institute are engaged in nuclear studies, in the following areas: studies of the nuclear reaction mechanism at low, intermediate and high energies, studies of nuclear structure by means of gamma spectroscopy, and theoretical research concerning nuclear structure and reaction mechanisms. Most of these studies are carried out in the form of international collaborations with the world-leading nuclear physics experimental facilities. Our physicists usually play an important role in these collaborative projects and often lead them. Nuclear structure experiments were performed mainly within the following European Large Scale Facilities: ALPI-INFN-Legnaro, VIVITRONIReS-Strasbourg, UNILAC/SIS-GSI-Darmstadt, K100-Cyclotron-Jyvaeskylea with the use of the GASP, GARFIELD, EUROBALL, ICARE, RISING + FRS, RITU+JUROGAM systems and with the application of RFD, HECTOR, DIAMANT, EUCLIDES ancillary detectors. Experimental data were also obtained at the Argonne National Laboratory, USA, with the GAMMASPHERE array and the ATLAS accelerator. In addition, we are involved in planning the experiments for the project of international accelerator facility of the next generation FAIR (Facility for Antiproton and Ion Research) at GSI. The nuclear reaction experiments were performed at the Joint Institute of Nuclear Physics in Dubna (collaborations FASA and COMBAS), in GANIL in Caen, in the Forschungszentrum Juelich at the accelerator COSY in the framework of collaboration PISA, as well as at the Warsaw Laboratory of Heavy Ions. The hadronic nuclear physics experiments were carried out exclusively at the Forschungszentrum Juelich where we have participated in international collaborations COSY11, GEM and HIRES. Recently, we have joined international detector project WASA planned at Forschungszentrum Juelich and plan to participate in the project PANDA, being constructed in GSI Darmstadt. Both detectors will be devoted to low and intermediate hadronic physics. We also

  14. Institute of Energy and Climate Research IEK-6. Nuclear waste management and reactor safety report 2009/2010. Material science for nuclear waste management

    Klinkenberg, M; Neumeier, S; Bosbach, D [eds.

    2011-07-01

    Due to the use of nuclear energy about 17.000 t (27.000 m{sup 3}) of high level waste and about 300.000 m{sup 3} of low and intermediated level waste will have accumulated in Germany until 2022. Research in the Institute of Energy and Climate Research (IEK-6), Nuclear Waste Management and Reactor Safety Division focuses on fundamental and applied aspects of the safe management of nuclear waste - in particular the nuclear aspects. In principle, our research in Forschungszentrum Juelich is looking at the material science/solid state aspects of nuclear waste management. It is organized in several research areas: The long-term safety of nuclear waste disposal is a key issue when it comes to the final disposal of high level nuclear waste in a deep geological formation. We are contributing to the scientific basis for the safety case of a nuclear waste repository in Germany. In Juelich we are focusing on a fundamental understanding of near field processes within a waste repository system. The main research topics are spent fuel corrosion and the retention of radionuclides by secondary phases. In addition, innovative waste management strategies are investigated to facilitate a qualified decision on the best strategy for Germany. New ceramic waste forms for disposal in a deep geological formation are studied as well as the partitioning of long-lived actinides. These research areas are supported by our structure research group, which is using experimental and computational approaches to examine actinide containing compounds. Complementary to these basic science oriented activities, IEK-6 also works on rather applied aspects. The development of non-destructive methods for the characterisation of nuclear waste packages has a long tradition in Juelich. Current activities focus on improving the segmented gamma scanning technique and the prompt gamma neutron activation analysis. Furthermore, the waste treatment group is developing concepts for the safe management of nuclear

  15. Radiological consequences of the Chernobyl reactor accident

    Hill, P.; Hille, R.

    2003-01-01

    The reactor accident at unit 4 of the Chernobyl nuclear power plant in Ukraine has deeply affected the living conditions of millions of people. Especially the health consequences have been of public concern up to the present and also been the subject of sometimes absurd claims. The current knowledge on the radiological consequences of the accident is reviewed. Though an increased hazard for some risk groups with high radiation exposure, e.g., liquidators, still cannot be totally excluded for the future, the majority of the population shows no statistically significant indication of radiation-induced illnesses. The contribution of the Research Center Juelich to the assessment of the post-accidental situation and psychological relief of the population is reported. The population groups still requiring special attention include, in particular, children growing up in highly contaminated regions and the liquidators of the years 1986 and 1987 deployed immediately after the accident. (author)

  16. NIC symposium 2012. 25 years HLRZ/NIC. Proceedings

    Binder, Kurt

    2012-01-01

    Since 25 years the John von Neumann Institute for Computing (NIC), the former ''Hoechstleistungsrechenzentrum'', plays a pioneering role in supporting research in computational science at the fore-front, by giving large grants of computer time to carefully selected research projects. The scope of these projects ranges from fundamental aspects of physics, such as the physics of elementary particles and nuclear physics, astrophysics, statistical physics and physics of condensed matter, computational chemistry and life sciences, to more applied areas of research, such as the modelling of processes in the atmosphere, materials science, fluid dynamics applications in engineering, etc. Use of the supercomputer resources that the Juelich Supercomputing Centre (JSC) provides for these research projects. The present book, which appears in the framework of the biannual NIC Symposia series, continues a tradition started 10 years ago, to present selected highlights of this research to a broader audience. Due to space restrictions, only a small number of the research projects that are carried out at the NIC can be presented in this way. Projects that stand out as particularly excellent are nominated as ''John von Neumann Excellence Project'' by the review board. In 2010 this award was given to A. Muramatsu (Stuttgart) for his project on ''Quantum Monte Carlo studies of strongly correlated systems''. In 2011, two such awards were given to C. Hoelbling (Wuppertal) for his project ''Computing B K with 2+1 flavours at the physical mass point'', and another one to W. Paul (Halle) for ''Long range correlations at polymer-solid interfaces''. The procedures adopted by the NIC to identify the scientifically best projects for the allocation of computer time are of the same character as those used by organisations founded more recently, such as (in Germany) the Gauss Centre for Supercomputing (GCS), an alliance of the three German national supercomputing centres in Juelich, Garching and

  17. NIC symposium 2012. 25 years HLRZ/NIC. Proceedings

    Binder, Kurt [Mainz Univ. (Germany). Inst. fuer Physik; Muenster, Gernot [Muenster Univ. (Germany). Inst. fuer Theoretische Physik 1; Kremer, Manfred [Forschungszentrum Juelich GmbH (DE). Juelich Supercomputing Centre (JSC)

    2012-08-07

    Since 25 years the John von Neumann Institute for Computing (NIC), the former ''Hoechstleistungsrechenzentrum'', plays a pioneering role in supporting research in computational science at the fore-front, by giving large grants of computer time to carefully selected research projects. The scope of these projects ranges from fundamental aspects of physics, such as the physics of elementary particles and nuclear physics, astrophysics, statistical physics and physics of condensed matter, computational chemistry and life sciences, to more applied areas of research, such as the modelling of processes in the atmosphere, materials science, fluid dynamics applications in engineering, etc. Use of the supercomputer resources that the Juelich Supercomputing Centre (JSC) provides for these research projects. The present book, which appears in the framework of the biannual NIC Symposia series, continues a tradition started 10 years ago, to present selected highlights of this research to a broader audience. Due to space restrictions, only a small number of the research projects that are carried out at the NIC can be presented in this way. Projects that stand out as particularly excellent are nominated as ''John von Neumann Excellence Project'' by the review board. In 2010 this award was given to A. Muramatsu (Stuttgart) for his project on ''Quantum Monte Carlo studies of strongly correlated systems''. In 2011, two such awards were given to C. Hoelbling (Wuppertal) for his project ''Computing B{sub K} with 2+1 flavours at the physical mass point'', and another one to W. Paul (Halle) for ''Long range correlations at polymer-solid interfaces''. The procedures adopted by the NIC to identify the scientifically best projects for the allocation of computer time are of the same character as those used by organisations founded more recently, such as (in Germany) the Gauss Centre for Supercomputing (GCS), an alliance of the three German national supercomputing centres in Juelich, Garching

  18. The impact of new polarization data from Bonn, Mainz and Jefferson Laboratory on γp → πN multipoles

    Anisovich, A.V.; Nikonov, V.; Sarantsev, A. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik der, Bonn (Germany); PNPI, NRS ' ' Kurchatov Institute' ' , Gatchina (Russian Federation); Beck, R.; Gottschall, M.; Hartmann, J.; Klempt, E.; Thiel, A.; Thoma, U.; Wunderlich, Y. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik der, Bonn (Germany); Doering, M. [George Washington University, Department of Physics, Washington, DC (United States); Thomas Jefferson National Accelerator Facility, Newport News, VA (United States); Kashevarov, V.; Ostrick, M.; Tiator, L. [Institut fuer Kernphysik der Universitaet Mainz, Mainz (Germany); Meissner, Ulf G. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik der, Bonn (Germany); Universitaet Bonn, Bethe Center for Theoretical Physics, Bonn (Germany); Juelich Center for Hadron Physics, JARA FAME and JARA HPC, Forschungszentrum Juelich, Institut fuer Kernphysik, Institute for Advanced Simulation, Juelich (Germany); Roenchen, D. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik der, Bonn (Germany); Universitaet Bonn, Bethe Center for Theoretical Physics, Bonn (Germany); Strakovsky, I.; Workman, R. [George Washington University, Department of Physics, Washington, DC (United States)

    2016-09-15

    New data on pion-photoproduction off the proton have been included in the partial-wave analyses Bonn-Gatchina and SAID and in the dynamical coupled-channel approach Juelich-Bonn. All reproduce the recent new data well: the double-polarization data for E, G, H, P and T in γp → π{sup 0}p from ELSA, the beam asymmetry Σ for γp → π{sup 0}p and π{sup +}n from Jefferson Laboratory, and the precise new differential cross section and beam asymmetry data Σ for γp → π{sup 0}p from MAMI. The new fit results for the multipoles are compared with predictions not taking into account the new data. The mutual agreement is improved considerably but still far from being perfect. (orig.)

  19. Double-polarization observable G in neutral-pion photoproduction off the proton

    Thiel, A.; Lang, M.; Afzal, F.; Beck, R.; Boese, S.; Funke, C.; Gottschall, M.; Gruener, M.; Hammann, C.; Hannappel, J.; Hartmann, J.; Hoffmeister, P.; Honisch, C.; Kaiser, D.; Kalinowsky, H.; Kalischewski, F.; Klassen, P.; Klempt, E.; Koop, K.; Kube, M.; Mahlberg, P.; Mueller, J.; Muellers, J.; Piontek, D.; Schmidt, C.; Seifen, T.; Sokhoyan, V.; Spieker, K.; Thoma, U.; Urban, M.; Pee, H. van; Walther, D.; Wendel, C.; Winnebeck, A. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik, Bonn (Germany); Eberhardt, H.; Bantes, B.; Dutz, H.; Elsner, D.; Ewald, R.; Fornet-Ponse, K.; Frommberger, F.; Goertz, S.; Hammann, D.; Hillert, W.; Jude, T.; Kammer, S.; Kleber, V.; Klein, F.; Reeve, S.; Runkel, S.; Schmieden, H. [Universitaet Bonn, Physikalisches Institut, Bonn (Germany); Anisovich, A.V.; Bayadilov, D.; Nikonov, V.; Sarantsev, A. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik, Bonn (Germany); Petersburg Nuclear Physics Institute, Gatchina (Russian Federation); Bichow, M.; Meyer, W.; Reicherz, G. [Ruhr-Universitaet Bochum, Institut fuer Experimentalphysik I, Bochum (Germany); Brinkmann, K.T.; Gutz, E. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen und Kernphysik, Bonn (Germany); Universitaet Giessen, II. Physikalisches Institut, Giessen (Germany); Crede, V. [Florida State University, Department of Physics, Tallahassee, FL (United States); Dieterle, M.; Keshelashvili, I.; Krusche, B.; Witthauer, L. [Universitaet Basel, Institut fuer Physik, Basel (Switzerland); Friedrich, S.; Makonyi, K.; Metag, V.; Nanova, M. [Universitaet Giessen, II. Physikalisches Institut, Giessen (Germany); Gridnev, A.; Lopatin, I. [Petersburg Nuclear Physics Institute, Gatchina (Russian Federation); Wilson, A. [Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik, Bonn (Germany); Florida State University, Department of Physics, Tallahassee, FL (United States); Collaboration: The CBELSA/TAPS Collaboration

    2017-01-15

    This paper reports on a measurement of the double-polarization observable G in π{sup 0} photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bonn. The observable G is determined from reactions of linearly polarized photons with longitudinally polarized protons. The polarized photons are produced by bremsstrahlung off a diamond radiator of well-defined orientation. A frozen spin butanol target provides the polarized protons. The data cover the photon energy range from 617 to 1325 MeV and a wide angular range. The experimental results for G are compared to predictions by the Bonn-Gatchina (BnGa), Juelich-Bonn (JueBo), MAID and SAID partial wave analyses. Implications of the new data for the pion photoproduction multipoles are discussed. (orig.)

  20. BMFT. Partial programme ocean research. Annual report 1991

    1992-01-01

    The project sponsors 'Biology, energy, ecology' and 'Materials and raw materials research' at Forschungszentrum Juelich GmbH were charged by the Federal Ministry for Research and Technology with the supervision of the promotion of the 'Marine research' subprogram. A summary is given of marine research programs promoted in 1991. These programs covered marine pollution analysis and monitoring (research and development), marine biology (research into marine ecosystems), marine research equipment and methods, maritime meteorology (research into maritime climates), new and unconventional marine nutrition sources (aquaculture), investigation of biological and technological aspects relevant to fishery, international cooperation and marine geosciences. A general survey is given of the promoted projects, and the individual activities are briefly described on standardized data sheets. The appendix gives project and joint-project indices and a list of firms and companies. (orig./BBR) [de

  1. Near threshold enhancement of the p p-bar mass spectrum in J/Psi decay

    A. Sibirtsev; J. Haidenbauer; S. Krewald; Ulf-G. Meissner; A.W. Thomas

    2004-01-01

    We investigate the nature of the near-threshold enhancement in the p (bar p) invariant mass spectrum of the reaction J/Ψ → γ p (bar p) reported recently by the BES Collaboration. Using the Juelich N (bar N) model we show that the mass dependence of the p (bar p) spectrum close to the threshold can be reproduced by the S-wave p (bar p) final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the N (bar N) interaction near threshold and of the J/Ψ → γ p (bar p) reaction mechanism and in view of the controversial situation in the decay J/Ψ → π 0 p (bar p), where no obvious signs of a p (bar p) final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage

  2. Die Energiewerke Nord GmbH. From operator of a decommissioned Russian nuclear power plant to one of Europe's leading decommissioning companies

    Philipp, Marlies

    2011-01-01

    EWN GmbH is a state-owned company with these duties: - decommissioning and demolition of the Greifswald and Rheinsberg nuclear power stations; - safe operation of the Zwischenlager Nord interim store; - development of the 'Lubminer Heide' industrial and commercial estate. Other projects for which EWN GmbH uses its know-how: - disposal of 120 decommissioned Russian nuclear submarines in Murmansk; - decommissioning and dismantling of the Juelich, NRW, AVR experimental reactor; - demolition of nuclear plants; running the Central Decontamination Operations Department at Karlsruhe, BW. Since 2008, EWN GmbH has held 25% of the shares of Deutsche Gesellschaft zum Bau- und Betrieb von Endlagern fuer Abfallstoffe mbH (DBE), a firm building and operating nuclear repositories. (orig.)

  3. Regions with increased natural radioactivity. Pt. 4

    Sansoni, B.; Matthes, W.; Schnitzler, J.

    1986-05-01

    Between May 23 and June 23, 1984, 169 specimens were taken of surface water and drinking water in the Fichtelgebirge, mainly from natural springs and wells in the granite region as well as in part from the drinking water supply. The uranium concentration was measured in the measuring van by a laser fluorimeter UA-3 (Scintrex); the water temperature, electrical conductivity, oxygen concentration and the pH value were determined by the Combibox (WTW). Furthermore, the discharge from the springs and wells was also determined. The concentration of radon-222 was emanometrically determined the following day in the field laboratory, while the radium-226 was separated overnight from the 20-l water specimens by ion exchange at manganese dioxide columns. The radium-226 was later determined emanometrically from the eluate in Juelich. Multi-element determinations by ICP atomic emission, atomic fluorescence and atomic absorption spectrometry were carried out in selected water specimens. (orig./HP) [de

  4. Detector development and experiments at COSY

    Morsch, H.P.

    1988-05-01

    These proceedings contain the manuscripts of the lectures presented at the named workshop. These concern a review about the COSY project, ideal detectors for hadron physics at COSY, possible experiments at COSY, magnetic spectrometers, a modification of BIG KARL, consideration on COSY experiments in the early stage, a detector for exclusive 2-meson production experiments, the excitation of baryons and physics with complex projectiles, a status report about the Indiana cooler ring, special scintillators, multiwire chambers, position-sensitive semiconductor detectors, detectors for neutral particles, a small large-acceptance photon detector, a status report of the two-arm photon spectrometer TAPS, studies on the parity violation in the pp scattering, the measurement of excitation functions for the study of dibaryon states, and results from the neutron workshop held in February 1988 at the KFA Juelich. (HSI)

  5. Microspheres Prepared by Internal Gelation - Understanding of HMTA and urea reactions

    Robisson, A.C.; Dauby, J.; Grandjean, S.; Benay, G.; Modolo, G.

    2008-01-01

    Homogenous microspheres of minor actinide (hereafter MA) compounds are of interest to prevent the generation and dispersal of MA powder at the early stages of the fabrication of targets for homogenous or heterogeneous transmutation. Sol-gel routes are being investigated as one of the possible solutions for producing these homogeneous starting materials. This document describes internal gelation basis experiments led at Cea Marcoule and at the Institute for Energy Research Juelich dedicated to the synthesis of mixed compounds including MAs, particularly mixed actinide-actinide or mixed actinide-inert element compounds. Parameter studies were undertaken by simulating cations in order to scan a larger range of conditions and to optimise more easily gelation conditions. With these experiments, key parameters were put forward and the main successive reactions taking care during gelation were understood. (authors)

  6. CAS CERN Accelerator School: Fourth general accelerator physics course

    Turner, S.

    1991-01-01

    The fourth CERN Accelerator School (CAS) basic course on General Accelerator Physics was given at KFA, Juelich, from 17 to 28 September 1990. Its syllabus was based on the previous similar courses held at Gif-sur-Yvette in 1984, Aarhus 1986, and Salamanca 1988, and whose proceedings were published as CERN Reports 85-19, 87-10, and 89-05, respectively. However, certain topics were treated in a different way, improved or extended, while new subjects were introduced. All of these appear in the present proceedings, which include lectures or seminars on the history and applications of accelerators, phase space and emittance, chromaticity, beam-beam effects, synchrotron radiation, radiation damping, tune measurement, transition, electron cooling, the designs of superconducting magnets, ring lattices, conventional RF cavities and ring RF systems, and an introduction to cyclotrons. (orig.)

  7. Where is the future of nuclear chemistry

    1980-01-01

    The future potentials of nuclear chemistry as a natural science with a strong orientation towards practical applications has been discussed at this meeting of 45 experts coming from research institutes and laboratories working in the fields of radiochemistry, nuclear chemistry, inorganic and applied chemistry, hot-atom chemistry, radiobiology, and nuclear biology, and from the two nuclear research centres at Juelich and Karlsruhe. The discussion centred around the four main aspects of future work, namely 1. basic research leading to an extension of the periodic table, nuclear reactions, the chemistry of superheavy elements, cosmochemistry; 2. radionuclide technology and activation analysis; 3. nuclear fuel cycle and reprocessing processes together with ultimate disposal methods; 4. radiochemistry in the life sciences, including nuclear chemistry and applications. (HK) [de

  8. The second Euratom sponsored 9000C HTR fuel irradiation experiment in the HFR Petten Project E 96.02: Pt.2. Post-irradiation examination

    Roettger, R.; Bueger, J. de; Schoots, T.

    1977-01-01

    A large variety of HTR fuel specimens, loose coated particles, coupons and compacts provided by Belgonucleaire, the Dragon Project and the KFA Juelich have been irradiated in the HFR at Petten at about 900 0 C up to a maximum fast neutron fluence of about 7x10 21 cm -2 (EDN) as a Euratom sponsored experiment. The maximum burn-ups were between 11 and 18.5% FIMA. The results of the post-irradiation examinations, comprising visual inspection, dimensional measurements, microradiography, metallography, and burn-up determinations are presented in this part 2 of the final report. The examinations have shown that the endurance limit of most of the tested fuel varieties is beyond the reached irradiation values

  9. Project study of a small-angle neutron scattering apparatus

    Schedler, E.; Pollet, J.L.

    1979-03-01

    This design study deals with the set up of a low angle scattering apparatus in the HMI reactor hall in Berlin. The experiences of other institutes with facilities of a similar type, - especially with D11 and D17 of the ILL in Grenoble, the set up the KFA in Juelich and of the PTB in Braunschweig -, are included to a large extend. The aim of this paper is - to define the necessary boundary conditions for the construction (including: installation of a cold source, the beam line, the neutron guide pipe and an extention of the reactor hall), -to determine the properties of the planned apparatus, especially in comparison with D11, probably the most versatile instrument, - to make desitions for the design of the components, - to work out the detailed drawings for construction - to estimate the costs and the time necessary for construction, if industrial manufacturers set up the project. (orig.) [de

  10. The HTR 500 concept based on pratical THTR and AVR experience

    Wachholz, W.; Weicht, U.

    1988-01-01

    This paper discusses progress during the past ten years in the development of a specific HTR safety concept. This has been mainly characterized by the abandonment of the LWR specific safety principles and making use of the safety characteristics typical of the high-temperature reactor (HTR). In the design, construction and operation of high-temperature reactors - especially AVR (15 MWe plant in Juelich, FRG) and THTR (300 MWe plant in Hamm-Uentrop, FRG) - experience has been gained in the field of accident topology and plant risk of HTRs in recent years. This experience, based on detailed accident analyses performed by manufacturers and experts, is relevant for the entire HTR line independent of specific projects. The authors focus on the HTR 500, the first commercial high temperature reactor with a pebble bed core. Its design principles and the design of its systems are based on the earlier AVR and THTR projects

  11. LAP-ND: a new instrument for vector polarization analysis and neutron depolarization measurements at FRJ-2

    Ioffe, Alexander; Bussmann, Klaus; Dohmen, Ludwig; Axelrod, Leonid; Gordeev, Gennadi; Brueckel, Thomas

    2004-01-01

    The method of vector analysis of the neutron polarization allows for the determination of both the magnitude and the direction of the magnetization vector in the sample. A directional distribution of the magnetization in a sample results in a spread of the direction of the polarization vector in space and thus in the depolarization of the incident beam. A new neutron depolarization set up is installed at the research reactor FRJ-2 of the Forschungszentrum Juelich. The main feature of the set up is the use of rather long wavelength, λ=(4-6.5) A, neutrons thus allowing for a significant increase in the sensitivity of depolarization measurements. The set up uses a non-cryogenic zero-field sample chamber with the residual magnetic field of about 1 mG. It will be used for the determination of the sample magnetization at mesoscopic and macroscopic levels and for the study of magnetic phase transitions, magnetic nanostructures, magnetic glasses, etc

  12. A viable on-chip FPGA configuration memory scrubbing approach for CBM-ToF

    Oancea, Andrei-Dumitru; Stuellein, Christian; Manz, Sebastian; Gebelein, Jano; Kebschull, Udo [Infrastruktur und Rechnersysteme in der Informationsverarbeitung (IRI), Goethe-Universitaet, Senckenberganlage 31, 60325 Frankfurt am Main (Germany); Collaboration: CBM-Collaboration

    2015-07-01

    The ToF Detector of the CBM Experiment will be equipped with FPGA-based read-out boards (ROBs). These ROBs will be operated in a radiation environment, and therefore need a mitigation mechanism against soft errors in the SRAM-based configuration memories of the FPGAs. The proposed approach combines intrinsic on-chip single upset correction with extrinsic selective frame scrubbing for multiple-bit upsets. The slow control is realized using the GBT-SCA, which is capable of handling interrupts. This enables the new approach of event-driven configuration frame correction. While conventional blind scrubbing leads to a continuous load on the control path, the selective frame scrubbing reduces this load to a minimum. For verification purposes, radiation tests with a proton beam were performed at COSY, Juelich. The occurred soft errors were classified into single and multiple- bit upsets, enabling an estimation of the rate at which extrinsic intervention is necessary.

  13. Description of the moderator systems for the ESS project

    Stendal, K.

    1996-10-01

    This paper describes a suggestion for the arrangement of the Cold Neutron Sources for the two targets in the ESS project. (European Spallation Source). The suggestion is based upon the technique of the existing cold neutron sources at Risoe in Denmark, HMI and Geestacht in Germany. As moderating media all of them use H 2 in supercritical condition, circulated by blowers, and the safety of the systems is based upon the triple-containment philosophy. This seems to be the most convenient principle to use near the ESS targets, as it provides a larger degree of freedom with respect to the arrangement of these sources and pipe connections to the chambers, especially because the space is limited and access to the target is relatively complicated. The moderator chambers have been designed by KFA, Juelich and the rest of the arrangement by Risoe, DK. The price calculations used for the ESS project are based upon this arrangement. (au)

  14. General program of energy research: innovation in hard coal, 1974-1977. New drivage systems. Rahmenprogramm energieforschung: innovation steinkohle, 1974-1977. Neue vortriebssysteme. Volume 1, Part 1

    1979-01-01

    During the four year period of the program, initiated by the German Federal government, 19 research and machine development projects in the field of road heading machines were subsidized. The Juelich energy research project management oversaw the progress of the programs. Projects for developing new machines at a total cost of 0.1 to 3.2 million DM per project were subsidized by 50%. The developed machinery includes the Roboter, WAV 200 and AM 50 high powered road cutter loaders, HSV 4 and Hausherr Mini ripper hydraulic percussion hammer heading machines, the DEMAG/SVM full face tunneling machine with a cutting head of 6 m in diameter, efficient drilling and blasting equipment for road drivage in rock and mechanized systems for achieving efficient support work, and keeping pace with the speed of mine drivage.

  15. General program of energy research: innovation in hard coal, 1974-1977. New logistical systems. Volume 2. Rahmenprogramm energieforschung: innovation steinkohle, 1976-1977. Neue logistische systeme. Volume 2

    1979-01-01

    The Federal Ministry of Economy subsidized 22 research and development projects in the field of new logistic systems in underground coal mines. The Juelich energy research project management, as the representative of the ministry, examined and endorsed all projects before the financial aid of 50% of the total project cost was granted. The 22 projects included development of the following underground equipment: electrical motor brakes for belt conveyors, automatic operation of underground locomotive transportation, protected batteries for use in firedamp conditions, rack wheel drives for the rack rail train and suspended monorail trolley, electrical equipment for 10 kV power supply, flame proof electrical switches, capacitors, circuit breakers, transformers and vacuum contactors,a chair lift system for personnel transportation, and also computerized monitoring systems in the field of mine operation and mine safety.

  16. Feasibility studies for the Forward Spectrometer

    Biernat, Jacek

    2015-01-01

    The Forward Spectrometer designed for the P-barANDA detector will consist of many different detector systems allowing for precise track reconstruction and particle identification. Feasibility studies for Forward Spectrometer done by means of specific reactions will be presented. In the first part of the paper, results of simulations focussing on rate estimates of the tracking stations based on straw tubes will be presented. Next, the importance of the Forward Tracker will be demonstrated through the reconstruction of the ψ(4040) → DD-bar decay. Finally, results from the analysis of the experimental data collected with a straw tube prototype designed and constructed at the Research Center in Juelich will be discussed. (paper)

  17. Theoretical studies of multistep processes, isospin effects in nuclear scattering, and meson and baryon interactions in nuclear physics: [Annual] progress report, May 1, 1986 to April 30, 1987

    Madsen, V.A.; Landau, R.H.

    1987-01-01

    A progress report on a grant from the DOE supporting theoretical studies in nuclear physics at Oregon State University in 1986, 1987 is presented. The research was led by Professors Landau and Madsen and carried out in collaboration with graduate students in Corvallis and scientists at LLNL-Livermore, KFA-Juelich, Purdue University, Florida State University and TRIUMF. The studies included meson exchange current effects deduced from spin observables in p- 3 He scattering, coupled bound and continuum eigenstates in momentum space for kaons and antiprotons, and charge symmetry violation in π scattering from trinucleons. Additional studies included microscopic optical potential calculations, multiple step processes, and differences in neutron and proton multipole matrix elements and transition densities in low lying collective states and in giant resonances

  18. Backscattering at a pulsed neutron source, the MUSICAL instrument

    Alefeld, B.

    1995-01-01

    In the first part the principles of the neutron backscattering method are described and some simple considerations about the energy resolution and the intensity are presented. A prototype of a backscattering instrument, the first Juelich instrument, is explained in some detail and a representative measurement is shown which was performed on the backscattering instrument IN10 at the ILL in Grenoble. In the second part a backscattering instrument designed for a pulsed neutron source is proposed. It is shown that a rather simple modification, which consists in the replacement of the Doppler drive of the conventional backscattering instrument by a multi silicon monochromator crystal (MUSICAL) leads to a very effective instrument, benefitting from the peak flux of the pulsed source. ((orig.))

  19. Near threshold enhancement of the p p-bar mass spectrum in J/Psi decay

    A. Sibirtsev; J. Haidenbauer; S. Krewald; Ulf-G. Meissner; A.W. Thomas

    2004-12-01

    We investigate the nature of the near-threshold enhancement in the p {bar p} invariant mass spectrum of the reaction J/{Psi} {yields} {gamma} p {bar p} reported recently by the BES Collaboration. Using the Juelich N {bar N} model we show that the mass dependence of the p {bar p} spectrum close to the threshold can be reproduced by the S-wave p {bar p} final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the N {bar N} interaction near threshold and of the J/{Psi} {yields} {gamma} p {bar p} reaction mechanism and in view of the controversial situation in the decay J/{Psi} {yields} {pi}{sup 0} p {bar p}, where no obvious signs of a p {bar p} final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.

  20. Double Δ-exchange contribution to pp-bar annihilation into three pions

    Betz, M.; Veit, E.A.; Haidenbauer, J.; Mull, V.

    1999-01-01

    Proton-antiproton annihilation into three uncorrelated pions is studied in a model based on both nucleon and Δ exchanges, with initial-state interactions described by the most complete version of the Juelich N N-bar model. The present work focuses in particular on the contribution of double Δ exchange, which had not been considered in previous work. The coupling constant at the ΔΔ π vertex, necessary to generate the double Δ-exchange amplitude, is fixed by reference to the SU (2) x SU(2) quark model. The effects of double Δ exchange are found to be rather small, though not negligible fort the π + π - π 0 channel. (author)

  1. A zero-degree spectrometer in Celsius and the d(d,2π)4He reaction

    Thoerngren Engblom, P.

    1996-02-01

    For the realization of near threshold studies a small-size spectrometer has been developed by the Nuclear Physics Division at Stockholm University in conjunction with Institut fuer Kernphysik in Juelich. A particle telescope is mounted inside the CELSIUS vacuum chamber in the bend following the cluster-jet target. It is possible to vary the measuring position within the dipole field to cover different magnetic rigidities which makes it a versatile tool for studies of threshold reactions. The first aim has been to study two-pion production and the present paper is a report on the experimental set-up and data analysis of measurements of the reaction d+d→ 4 He+X. Detection of the 4 He-particle yields information about the missing mass, i.e. the remainder of the reaction products. Preliminary results are presented. 22 refs

  2. Perspectives for polarized antiprotons

    Lenisa, Paolo

    2012-01-01

    Polarized antiprotons would open a new window in hadron physics providing access to a wealth of single and double spin observables in proton-antiproton interactions. The PAX Collaboration aims to perform the first ever measurement of the spin-dependence of the proton-antiproton cross section at the AD ring at CERN. The spin-dependence of the cross section could in principle be exploited by the spin-filtering technique for the production of a polarized antiproton beam. As a preparatory phase to the experimentation at AD, the PAX Collaboration has initiated a series of dedicated studies with protons at the COSY-ring in Juelich (Germany), aimed at the commissioning of the experimental apparatus and confirmation of the predictions for spin-filtering with protons.

  3. Polarimetry concepts for the EDM precursor experiment at COSY

    Maanen, Paul [III. Physikalisches Institut B, RWTH Aachen (Germany); Collaboration: JEDI-Collaboration

    2015-07-01

    The CP violation in the Standard Model is not sufficient to explain the dominance of matter over antimatter in the universe. New CP violating sources could manifest as permanent electric dipole moments (EDM). So far, no direct measurement of a charged particle's EDM has been achieved. The goal of the JEDI (Juelich Electric Dipole moment Investigations) collaboration is to measure the EDM of light nuclei (p,d,{sup 3}He). In the chosen method, an EDM manifests as a small buildup of the vertical polarization of a stored hadron beam. Because the effect is very small, great care has to be taken designing the polarimeter. This talk gives an overview of the planned detector concept and discusses first results of simulations and experiments.

  4. Competitiveness and range of applications of nuclear power, as seen in the light of recent developments in the field of energy economic and energy policy

    Michaelis, H.

    1975-01-01

    At the reactor conferences in Karlsruhe in 1973 and in Berlin in 1974 the author gave his views on the competitive position of nuclear energy in the German Federal Republic and described how the determining factors in cost development, both for conventional energy generation and for nuclear power generation, have developed since October 1971. Basic data were provided by the paper by B. Bergmann and H. Kraemer (KFA Juelich) 'Technical and economic state in October 1971 as well as prospects for nuclear energy in power economics in the German Federal Republic' (Juel-827-HT - February 1972). The author now shows to what extent the determining factors for the competitive capacity of nuclear energy in the Federal Republic of Germany have changed until April 1975. (orig.) [de

  5. The EDDA experiment at COSY

    Rohdjess, H.

    1998-01-01

    Polarized and unpolarized proton-proton elastic scattering is investigated with the EDDA-experiment at the Cooler Synchrotron COSY at Juelich to significantly improve the world data base in the beam energy range 500-2500 MeV. Measurements during beam acceleration with thin internal targets and a large acceptance detector produce excitation functions over a broad angular and energy range with unprecedented internal consistency. Data taking with an unpolarized CH 2 fiber target and an unpolarized beam have been completed and the derived differential cross sections demonstrate the benefit of this technique. With a polarized atomic beam target recently installed in COSY and a polarized COSY beam--currently under development--the measurements will be extended to analyzing powers and spin correlation parameters

  6. Theoretical and experimental studies of runaway electrons in the TEXTOR tokamak

    Abdullaev, S.S.; Finken, K.H.; Wongrach, K.; Willi, O.

    2016-01-01

    Theoretical and experimental studies of runaway electrons in tokamaks and their mitigations, particularly the recent studies performed by a group of the Heinrich-Heine University Duesseldorf in collaboration with the Institute of Energy and Climate Research of the Research Centre (Forschungszentrum) of Juelich are reviewed. The main topics focus on (i) runaway generation mechanisms, (ii) runaway orbits in equilibrium plasma, (iii) transport in stochastic magnetic fields, (iv) diagnostics and investigations of transport of runaway electron and their losses in low density discharges (v) runaway electrons during plasma disruptions, and (vi) runaway mitigation methods. The development of runaway diagnostics enables the measurement of runaway electrons in both the centre and edge of the plasma. The diagnostics provide an absolute runaway energy resolved measurement, the radial decay length of runaway electrons and, the structure and dynamics of runaway electron beams. The new mechanism of runaway electron formation during plasma disruptions is discussed.

  7. The German DEMO working group. Perspectives of a fusion power plant

    Hesch, Klaus

    2013-01-01

    Fusion development has many different challenges in the areas of plasma physics, fusion technologies, materials development and plasma wall interaction. For making fusion power a reality, a coherent approach is necessary, interlinking the different areas of work. To this end, the German fusion program started in 2010 the German DEMO Working Group, bringing together high-level experts from all the different fields, from the 3 German fusion centers Max-Planck-Institut fuer Plasmaphysik (IPP), Karlsruher Institut fuer Technologie (KIT) and Forschungszentrum Juelich (FZJ). An encompassing view of what will be needed with high priority, in plasma physics, in fusion technology and in the interrelation of the fields, to make fusion energy real, has been elaborated, and is presented here in a condensed way. On this basis, the 3 German fusion centers now are composing their work program, towards a fusion demonstration reactor DEMO. (orig.)

  8. International HTR activities

    Baust, E.; Weisbrodt, I.

    1989-01-01

    Asea Brown Boveri AG (ABB) and their subsidiary High Temperature Reactor Construction GmbH (HRB) have brought the pebble bed high temperature reactor to the edge of being ready for the market with the construction and operation of the AVR reactor at Juelich and the THTR 300 at Hamm-Uentrop. Siemens/Interatom have developed the HTR modular concept and, together with their partners HRB, KFA, Rheinbraun Bergbauforschung have taken the nuclear process heat project to its present advanced state of development. The further introduction of the HTR to the market is a long-term objective, due to the present market situation. ABB and Siemens AG have therefore agreed to collaborate by forming a joint company. (orig.)

  9. Progress report on nuclear data research in the Federal Republic of Germany for the period April 1, 1992 to March 31, 1993

    Qaim, S.M.

    1993-07-01

    This report has been prepared to promote the exchange of nuclear data research information between the Federal Republic of Germany and other member states of OECD/NEA and IAEA. It covers progress reports from KfK Karlsruhe, KFA Juelich, the universities of Dresden, Hannover, Koeln, Mainz, Marburg as well as from PTB Braunschweig and FIZ Karlsruhe. The emphasis in the work reported here is on measurement, compilation and evaluation of nuclear data for pure and applied science programmes, such as those relevant to fission- and fusion-reactor technology, radioactive waste management, accelerator shielding and development, astrophysics research, cosmogenic and meteoritic investigations, production of medically important radioisotopes, etc. Each contribution is presented under the laboratory heading from where the work is reported. The names of other participating laboratories are also mentioned. When the work is relevant to the World Request List for Nuclear Data, WRENDA 87/88 (INDC(SEC)-095/URSF), the corresponding identification numbers are given. (orig.)

  10. Present status of research and development for HTR in China

    Dazhong, Wang; Daxin, Zhong; Yuanhul, Xu [Institute of Nuclear Energy Technology, Tsinghua University, Beijing (China)

    1990-07-01

    The HTR R and D Project is being carried out in the relevant institutions in China. Some topics are covered such as, fuel element technology, graphite development, fuel element handling system, helium technology, fuel reprocessing technology as well as HTR design study. Some results of HTR research work are described. In addition, to provide a test facility for investigation of HTR Module reactor safety and process heat application of HTR, a joint project on building a 10 MW test HTR with Siemens-Interatom, KFA Juelich and INET is going on. The conceptual design of 10 MW test HTR has been completed by the joint group. In parallel the application study of HTR Module is being carried out for the oil industry, petrochemical industry as well as power generation. Some preliminary results of the application study, for example, for heavy oil recovery on Shengli oil field and process heat application in Yan shan petroleum company, are described. (author)

  11. Electron beam irradiation experiments of monoblock divertor mock-up

    Satoh, Kazuyoshi; Akiba, Masato; Araki, Masanori; Suzuki, Satoshi; Yokoyama, Kenji; Smid, I.; Cardella, A.; Duwe, R.; Di Pietro, E.

    1993-03-01

    It is one of the key issues for ITER to develop the divertor plate. Electron beam irradiation tests were carried out on a NET divertor mock-up using JEBIS at JAERI under a collaboration between The NET team, JAERI and KFA Juelich. Screening tests (maximum heat flux of 23 MW/m 2 ) and thermal cycling tests (18 MW/m 2 , 30s, 1000cycle) were carried out. As a result of the screening tests, the erosion caused by sublimation of C/C was observed on the surface of armor tile. No serious damage such as cracks or detachments, however, were found. As a result of the thermal cycling tests, no major damage was detected on the C/C surface. However cooling time constant of the divertor mock-up increased over 600cycle. Therefore it implies that some defects would occur at the brazing interface of the divertor mock-up. (author)

  12. PADI ASIC for straw tube read-out

    Pietraszko, Jerzy; Traeger, Michael; Fruehauf, Jochen; Schmidt, Christian [GSI, Darmstadt (Germany); Ciobanu, Mircea [ISS, Bucharest (Romania); Collaboration: CBM-Collaboration

    2016-07-01

    A prototype of the CBM MUCH straw tube detector consisting of six individual straws of 6mm inner diameter and 220 mm length filled with Ar/CO{sub 2} gas mixture has been tested at the COSY accelerator in Juelich. The straw tubes were connected to the FEET-PADI6-HDa PCB equipped with PADI-6 fast amplifier/discriminator ASIC. As a reference counter in this measurement the scCVD diamond detector has been used delivering excellent timing, time resolution below 100 ps (sigma), and very precise position information, below 50 μm. The demonstrated position resolution of about 160 μm of the straw tube read out with PADI-6 ASIC confirms the capability of the PADI chip and puts this development as a very attractive readout option for straw tubes and wire chambers.

  13. Sana experiments for self-acting removal of the after-heat in reactors with pebble bed fuel and their interpretation

    Niessen, H.F.; Stoecker, Bernd; Amoignon, Olivier; Zuying, Gao; Jie, Liu

    1997-01-01

    For the confirmation of self-acting afterheat removal under hypothetical accident conditions from pebble bed reactors at the Research Center Juelich a test facility with an electrical heating input up to 30kW was erected and operated. A description of the test facility is given. Within the different tests the pebble diameter, the pebble material, the gas in the pebble bed, the heating-power and the arrangement of the heating were changed. Parts of the data were used within an IAEA Co-ordinated Research Program as benchmark problems for the code validation. All computer codes could simulate the test results with a sufficient good agreement, when the tests were executed with helium. For the tests with nitrogen the natural convection has to be taken into account. (author)

  14. Study of the (p,α)-reaction on sd-shell nuclei and their microscopic analysis

    Hoyler, F.

    1982-01-01

    In the present thesis the (p,α) reaction on the 2s-1d-shell nuclei 23 Na, 24 Mg, 26 Mg, 27 Al, 35 Cl, 37 Cl, and 39 K was measured. The experiments were performed at the isochronous cyclotron JULIC of the Institute for Nuclear Physics of the Nuclear Research Facility Juelich and at the Emperor Van-de-Graaff accelerator of the Max Planck Institute for Nuclear Physics Heidelberg. Angular distributions for transitions to several residual nucleus states were evaluated in the energy range between 18 and 45 MeV incident proton energy. By the application of magnetic spectrometers as detection device an energy resolution between 25 and 45 keV could be reached. (orig./HSI) [de

  15. IAEA technical meeting on atomic and plasma-material interaction data for fusion science technology. Summary report

    Clark, R.E.H.

    2003-10-01

    The proceedings and conclusions of the Technical Meeting on 'Atomic and Plasma- Material Interaction Data for Fusion Science Technology' held in Juelich, Germany on October 28-31 are summarized. During the course of the meetings working groups were formed to review the status of specific areas of atomic, molecular and material physics of relevance to fusion and to make recommendations on data needs in fusion from these areas. The reports of those working groups are summarized and the complete reports included as appendices. This meeting brought together over fifty leading scientists in fusion related data. Results of research in a number of topics were presented and very useful discussions were held. The meeting was extremely successful. (author)

  16. Reactive flow simulations in complex geometries with high-performance supercomputing

    Rehm, W.; Gerndt, M.; Jahn, W.; Vogelsang, R.; Binninger, B.; Herrmann, M.; Olivier, H.; Weber, M.

    2000-01-01

    In this paper, we report on a modern field code cluster consisting of state-of-the-art reactive Navier-Stokes- and reactive Euler solvers that has been developed on vector- and parallel supercomputers at the research center Juelich. This field code cluster is used for hydrogen safety analyses of technical systems, for example, in the field of nuclear reactor safety and conventional hydrogen demonstration plants with fuel cells. Emphasis is put on the assessment of combustion loads, which could result from slow, fast or rapid flames, including transition from deflagration to detonation. As a sample of proof tests, the special tools have been tested for specific tasks, based on the comparison of experimental and numerical results, which are in reasonable agreement. (author)

  17. (Fuel, fission product, and graphite technology)

    Stansfield, O.M.

    1990-07-25

    Travel to the Forschungszentrum (KFA) -- Juelich described in this report was for the purpose of participating in the annual meeting of subprogram managers for the US/DOE Umbrella Agreement for Fuel, Fission Product, and Graphite Technology. At this meeting the highlights of the cooperative exchange were reviewed for the time period June 1989 through June 1990. The program continues to contribute technology in an effective way for both countries. Revision 15 of the Subprogram Plan will be issued as a result of the meeting. There was interest expressed by KFA management in the level of support received from the NPR program and in potential participation in the COMEDIE loop experiment being conducted at the CEA.

  18. Lifetime of heavy hypernuclei and its implications on the weak LAMBDA N interaction

    Cassing, W; Kamys, B; Kulessa, P; Niewodniczanski, H; Ohm, H; Pysz, K; Rudy, Z; Schult, O W B; Ströher, H

    2003-01-01

    The lifetime of the LAMBDA-hyperon in heavy hypernuclei measured in proton-Au, -Bi and -U collisions by the COSY-13 Collaboration at COSY-Juelich has been analyzed to yield tau subLAMBDA=(145+-11) ps. This value for tau subLAMBDA is compatible with the lifetime extracted from antiproton annihilation on Bi and U targets, albeit much more accurate. Theoretical models based on the meson exchange picture and assuming the validity of the phenomenological DELTA I=1/2 rule predict the lifetime of heavy hypernuclei to be significantly larger (2-3 standard deviations). Such large differences indicate that at least one of the assumptions in these models is not fulfilled. A much better reproduction of the lifetimes of heavy hypernuclei is achieved in the phase space model, if the DELTA I=1/2 rule is discarded in the nonmesonic LAMBDA decay. (orig.)

  19. Lifetime of heavy hypernuclei and its implications on the weak ΛN interaction

    Cassing, W.; Jarczyk, L.; Kamys, B.; Kulessa, P.; Pysz, K.; Ohm, H.; Schult, O.W.B.; Stroeher, H.; Rudy, Z.

    2003-01-01

    The lifetime of the Λ-hyperon in heavy hypernuclei measured in proton-Au, -Bi and -U collisions by the COSY-13 Collaboration at COSY-Juelich has been analyzed to yield τ Λ =(145±11) ps. This value for τ Λ is compatible with the lifetime extracted from antiproton annihilation on Bi and U targets, albeit much more accurate. Theoretical models based on the meson exchange picture and assuming the validity of the phenomenological ΔI=1/2 rule predict the lifetime of heavy hypernuclei to be significantly larger (2-3 standard deviations). Such large differences indicate that at least one of the assumptions in these models is not fulfilled. A much better reproduction of the lifetimes of heavy hypernuclei is achieved in the phase space model, if the ΔI=1/2 rule is discarded in the nonmesonic Λ decay. (orig.)

  20. ITER EDA newsletter. V. 10, no. 4

    2001-04-01

    This ITER EDA Newsletter presents an overview of the Fourteenth Meeting of the ITER Physics Expert Group on Diagnostics which was held at the Institute for Plasma Physics, Juelich, Germany, 21-23 March 2001. The summary of the Meeting covers the discussions of the Expert Group as well as developments reported on similar meetings concerning ongoing work in diagnostic design and ITER relevant diagnostic development work which took place nearly at the same time. In addition, the outline of the material treated at the International Workshop on the Confinement Database and Modelling Expert Group in collaboration with the Edge and Pedestal Physics Expert Group which was held on 2-6 April 2001 at the Plasma Physics Research Centre of Lausanne (CRPP) Switzerland is presented

  1. Correcting systematic errors in high-sensitivity deuteron polarization measurements

    Brantjes, N.P.M. [Kernfysisch Versneller Instituut, University of Groningen, NL-9747AA Groningen (Netherlands); Dzordzhadze, V. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Gebel, R. [Institut fuer Kernphysik, Juelich Center for Hadron Physics, Forschungszentrum Juelich, D-52425 Juelich (Germany); Gonnella, F. [Physica Department of ' Tor Vergata' University, Rome (Italy); INFN-Sez. ' Roma tor Vergata,' Rome (Italy); Gray, F.E. [Regis University, Denver, CO 80221 (United States); Hoek, D.J. van der [Kernfysisch Versneller Instituut, University of Groningen, NL-9747AA Groningen (Netherlands); Imig, A. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Kruithof, W.L. [Kernfysisch Versneller Instituut, University of Groningen, NL-9747AA Groningen (Netherlands); Lazarus, D.M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Lehrach, A.; Lorentz, B. [Institut fuer Kernphysik, Juelich Center for Hadron Physics, Forschungszentrum Juelich, D-52425 Juelich (Germany); Messi, R. [Physica Department of ' Tor Vergata' University, Rome (Italy); INFN-Sez. ' Roma tor Vergata,' Rome (Italy); Moricciani, D. [INFN-Sez. ' Roma tor Vergata,' Rome (Italy); Morse, W.M. [Brookhaven National Laboratory, Upton, NY 11973 (United States); Noid, G.A. [Indiana University Cyclotron Facility, Bloomington, IN 47408 (United States); and others

    2012-02-01

    This paper reports deuteron vector and tensor beam polarization measurements taken to investigate the systematic variations due to geometric beam misalignments and high data rates. The experiments used the In-Beam Polarimeter at the KVI-Groningen and the EDDA detector at the Cooler Synchrotron COSY at Juelich. By measuring with very high statistical precision, the contributions that are second-order in the systematic errors become apparent. By calibrating the sensitivity of the polarimeter to such errors, it becomes possible to obtain information from the raw count rate values on the size of the errors and to use this information to correct the polarization measurements. During the experiment, it was possible to demonstrate that corrections were satisfactory at the level of 10{sup -5} for deliberately large errors. This may facilitate the real time observation of vector polarization changes smaller than 10{sup -6} in a search for an electric dipole moment using a storage ring.

  2. Discussion on nuclear energy in the trade union journal 'Metall'

    Anon.

    1978-01-01

    For over one year there was a discussion about the problems of nuclear energy in the trade union journal 'Metall'. Invited by the editors, scientists from the university of Bremen also participated in this contoversy. In early 1977, an article with the title, Blessing or curse of the future' written by Bremen scientists was published in 5 parts. A reply was written by nine scientists, all but one from the Nuclear Research Centre in Juelich. This criticism caused the reaction of 17 persons from the university of Bremen. This document contains the articles which appeared in vanious numbers of the journal 'Metall', including the readers letters written by colleagues from the Union. (orig./GL) [de

  3. Theoretical and experimental studies of runaway electrons in the TEXTOR tokamak

    Abdullaev, S.S.; Finken, K.H.; Wongrach, K.; Willi, O.

    2016-07-01

    Theoretical and experimental studies of runaway electrons in tokamaks and their mitigations, particularly the recent studies performed by a group of the Heinrich-Heine University Duesseldorf in collaboration with the Institute of Energy and Climate Research of the Research Centre (Forschungszentrum) of Juelich are reviewed. The main topics focus on (i) runaway generation mechanisms, (ii) runaway orbits in equilibrium plasma, (iii) transport in stochastic magnetic fields, (iv) diagnostics and investigations of transport of runaway electron and their losses in low density discharges (v) runaway electrons during plasma disruptions, and (vi) runaway mitigation methods. The development of runaway diagnostics enables the measurement of runaway electrons in both the centre and edge of the plasma. The diagnostics provide an absolute runaway energy resolved measurement, the radial decay length of runaway electrons and, the structure and dynamics of runaway electron beams. The new mechanism of runaway electron formation during plasma disruptions is discussed.

  4. A CMOS integrated timing discriminator circuit for fast scintillation counters

    Jochmann, M.W.

    1998-01-01

    Based on a zero-crossing discriminator using a CR differentiation network for pulse shaping, a new CMOS integrated timing discriminator circuit is proposed for fast (t r ≥ 2 ns) scintillation counters at the cooler synchrotron COSY-Juelich. By eliminating the input signal's amplitude information by means of an analog continuous-time divider, a normalized pulse shape at the zero-crossing point is gained over a wide dynamic input amplitude range. In combination with an arming comparator and a monostable multivibrator this yields in a highly precise timing discriminator circuit, that is expected to be useful in different time measurement applications. First measurement results of a CMOS integrated logarithmic amplifier, which is part of the analog continuous-time divider, agree well with the corresponding simulations. Moreover, SPICE simulations of the integrated discriminator circuit promise a time walk well below 200 ps (FWHM) over a 40 dB input amplitude dynamic range

  5. NIC symposium 2012. 25 years HLRZ/NIC. Proceedings

    Binder, Kurt [Mainz Univ. (Germany). Inst. fuer Physik; Muenster, Gernot [Muenster Univ. (Germany). Inst. fuer Theoretische Physik 1; Kremer, Manfred (eds.) [Forschungszentrum Juelich GmbH (DE). Juelich Supercomputing Centre (JSC)

    2012-08-07

    Since 25 years the John von Neumann Institute for Computing (NIC), the former ''Hoechstleistungsrechenzentrum'', plays a pioneering role in supporting research in computational science at the fore-front, by giving large grants of computer time to carefully selected research projects. The scope of these projects ranges from fundamental aspects of physics, such as the physics of elementary particles and nuclear physics, astrophysics, statistical physics and physics of condensed matter, computational chemistry and life sciences, to more applied areas of research, such as the modelling of processes in the atmosphere, materials science, fluid dynamics applications in engineering, etc. Use of the supercomputer resources that the Juelich Supercomputing Centre (JSC) provides for these research projects. The present book, which appears in the framework of the biannual NIC Symposia series, continues a tradition started 10 years ago, to present selected highlights of this research to a broader audience. Due to space restrictions, only a small number of the research projects that are carried out at the NIC can be presented in this way. Projects that stand out as particularly excellent are nominated as ''John von Neumann Excellence Project'' by the review board. In 2010 this award was given to A. Muramatsu (Stuttgart) for his project on ''Quantum Monte Carlo studies of strongly correlated systems''. In 2011, two such awards were given to C. Hoelbling (Wuppertal) for his project ''Computing B{sub K} with 2+1 flavours at the physical mass point'', and another one to W. Paul (Halle) for ''Long range correlations at polymer-solid interfaces''. The procedures adopted by the NIC to identify the scientifically best projects for the allocation of computer time are of the same character as those used by organisations founded more recently, such as (in Germany) the Gauss Centre for

  6. VESPA. Behaviour of long-lived fission and activation products in the nearfield of a nuclear waste repository and the possibilities of their retention

    Bischofer, Barbara; Hagemann, Sven [Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) gGmbH, Koeln (Germany); Altmaier, Marcus [Karlsruher Institut fuer Technologie (KIT) (Germany); and others

    2016-06-15

    The present document is the final report of the Joint Research Project VESPA (Behaviour of Long-lived Fission and Activation Products in the Near Field of a Nuclear Waste Repository and the Possibilities of Their Retention), started in July 2010 with a duration of four years. The following four institutions were collaborative Partners in VESPA: - Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) gGmbH - Institut fuer Energie- und Klimaforschung, IEK-6: Nukleare Entsorgung und Reaktorsicherheit, Forschungszentrum Juelich (FZJ) - Institut fuer Ressourcenoekologie (IRE), Helmholtz-Zentrum Dresden-Rossendorf (HZDR) - Institut fuer Nukleare Entsorgung (INE), Karlsruher Institut fuer Technologie (KIT) VESPA was funded by the German Federal Ministry of Economics and Energy (BMWi) under the contract numbers 02 E 10770 (GRS), 02 E 10780 (FZJ-IEF-6), 02 E 10790 (HZDR-IRE), 02 E 10800 (KIT-INE).

  7. FAIR: a Horizon for Future Charming Physics

    Ritman, James

    2007-01-01

    The science goals underlying the future international Facility for Antiproton and Ion Research--FAIR--[1] that is being realized in Darmstadt span a broad range of research activities on the structure of matter. One component of this facility is directed towards studies of hadronic matter at the sub-nuclear level with beams of antiprotons. These studies focus on two key aspects: confinement of quarks and the generation of the hadron masses. These goals will be pursued by performing precision measurements of charged and neutral decay products from antiproton-proton annihilation in the charmonium mass region. In this talk I present some of the issues connected to FAIR in which the groups in Cracow and Juelich are extending and intensifying our cooperation

  8. Noise thermometer

    Von Brixy, H. [Forschungszentrum Juelich GmbH (Germany); Kakuta, Tsunemi

    1996-03-01

    The noise thermometry (NT) is a temperature measuring method by which the absolute temperature measurement can be performed with a very high accuracy and without any influence of ambient environments and of the thermal history of its NT sensor (electric resistor). Hence it is quite suitable for application as a standard thermometry to the in-situ temperature calibration of incore thermocouples. The KFA Juelich had played a pioneering role in the development of NT and applied the results successfully to the AVR for testing its feasibility. In this report, all about the NT including its principle, sensor elements and system configurations are presented together with the experiences in the AVR and the results of investigation to apply it to high temperature measurement. The NT can be adopted as a standard method for incore temperature measurement and in situ temperature calibration in the HTTR. (author). 85 refs.

  9. Gas chromatographic measurement in water-steam circuits

    Zschetke, J.; Nieder, R.

    1984-01-01

    A gas chromatographic technique for measurements in water-steam circuits, which has been well known for many years, has been improved by design modifications. A new type of equipment developed for special measuring tasks on nuclear engineering plant also has a general application. To date measurements have been carried out on the ''Otto Hahn'' nuclear powered ship, on the KNK and AVR experimental nuclear power plants at Karlsruhe and Juelich respectively and on experimental boiler circuits. The measurements at the power plants were carried out under different operating conditions. In addition measurements during the alkali operating mode and during combined cycle operation were carried out on the AVR reactor. It has been possible to draw new conclusion from the many measurements undertaken. (orig.) [de

  10. Characterization of BPM pickup designs for the HESR rate at FAIR using simulations and numerical calculations

    Halama, Arthur; Kamerdzhiev, Vsevolod; Boehme, Christian; Srinivasan, Sudharsan [Forschungszentrum Juelich, IKP-4 (Germany)

    2016-07-01

    The institute of Nuclear Physics 4(IKP-4) of the Research Center Juelich (FZJ) is in charge of building and commissioning the High Energy Storage Ring (HESR) within the international Facility for Antiproton and Ion Research (FAIR) at Darmstadt. Simulations and numerical calculations were performed to characterize the initial beam position pickup design. Capacitive couplings of the electrodes and the behavior of the electrical equivalent circuit were investigated. This made room for changes to the design and performance increase. A prototype of the BPM pickup was constructed and tested on a dedicated test bench. Preliminary results will be presented. In order to gain higher signal levels and higher sensitivity, another suggested design was characterized as well and put into comparison.

  11. EMF and risk perception

    Widemann, P.M.; Schuetz, H.

    1995-01-01

    There has lately been a greater responsivement in the media as well as the general public to the risk potential of high-frequency electromagnetic fields (EMF). If the discussion continues to gain momentum, this could have grave consequences for companies offering the products or services under attack. The working group Man, Environment, Technology (MUT) at Juelich Research Centre has examined the question of how EMF risks are valuated by the public. The study centered on the following questions: How are EMF risk potentials perceived by the public and what factors influence the public discussion? What future course might the discussion on risks take and what critical events and conditions deserve particular attention? The authors present and discuss the results of this first German study on product-inherent risks. (orig.) [de

  12. CFD simulation of hydrogen mixing and mitigation by means of passive auto-catalytic recombiners

    Kelm, S.; Reinecke, E-A.; Jahn, W.; Allelein, H-J.

    2011-01-01

    Modeling of passive auto-catalytic recombiners (PARs) operation in containment geometries involves a large variety of scales; thus, a CFD calculation resolving all these scales would be much too expensive. Therefore, the mechanistic PAR model REKO-DIREKT, developed at Forschungszentrum Juelich, has been coupled with the commercial CFD code ANSYS CFX in order to simulate PAR operation as well as the induced flow and transport phenomena. Based on a short introduction of REKO-DIREKT, its interface to CFX and the explicit coupling scheme is discussed. The paper is finalized by a first demonstration of simulation capabilities on the basis of the ThAI PAR-4 experiment (Becker Technologies GmbH, Eschborn, Germany). (author)

  13. From nuclear research to multidisciplinary research

    Theenhaus, R.; Baurmann, K.W.

    1996-01-01

    Forty years ago, the North Rhine-Westphalian State Government founded the then Juelich Nuclear Research Center. After a growth period of the reactor engineering program until 1980, claiming a share of 42% of R and D resources, that share declined continuously to a present level of 8%. This development is an expression of the activities successfully completed in the past, of progress achieved in industrial reactor development, but also of the fact that the high temperature reactor, which had been run successfully for twenty years, failed as a technical scale THTR-300 version. The Center has reorientated its line of research in a process of structural reshuffle beginning some fifteen years ago and still going on. Information technology, materials research, life sciences, environmental research, and energy technology have become main activities of equal weight. Activities specific to nuclear reactors have been incorporated in this new line of work as nuclear safety research and work on safe repository storage. (orig.) [de

  14. GISAXS study of Au-coated light-induced polymer gratings

    Castro-Colin, M., E-mail: miguel.castro-colin@bruker.com; Korolkov, D. [Bruker AXS, Rheinbrueckenstr. 49, 76187 Karlsruhe (Germany); Yadavalli, N. S. [Nanostructured Materials Lab, The University of Georgia, 30602 Athens, Georgia (United States); Mayorova, M.; Kentzinger, M. [Research Center Juelich, 52425 Juelich (Germany); Santer, S. [Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam (Germany)

    2015-07-23

    Surface Relief Gratings (SRGs) are inscribed in the Au-coated azobenzene containing photosensitive polymer films on a glass substrate. The structures consist of micrometer-period sinusoidal patterns of sub-micron amplitudes, formed by photo-isomerization and molecular reorientation processes in the polymer film during exposure to the light interference pattern that drove the formation of a SRG; the precursor is a stack sequence of Au, polymer, and glass. The SRG structures were exposed in GISAXS geometry to high-intensity X-ray radiation from a liquid Ga source (0.134 nm). Scattered photons were registered by a 2D detector, and their intensity distribution enabled us to characterize the structures. Analysis of the 2D patterns yielded information about the pitch of the gratings as well as the thickness of the films forming the gratings. The GISAXS experiments were carried out at the Research Center Juelich.

  15. Model experiments on depressurisation accidents in nuclear process heat plants (HTGR)

    Fritsching, G.; Wolf, G. [Internationale Atomreaktorbau G.m.b.H. (INTERATOM), Bergisch Gladbach (Germany, F.R.)

    1981-01-15

    The analysis of depressurisation accidents requires the use of digital computer programs to find out the dynamic loads acting on the plant structures. Because of the importance of such accidents in safety and licensing procedures of nuclear process heat plants, it is necessary to compare these computer results with suitable experiments to show the accuracy and the limits of the programs in question. For this purpose a series of depressurisation experiments has been started at INTERATOM on a small scale model of a primary loop of a nuclear process heat plant. Using the results of these experiments three different computer programs were tested with good success. The development of the experimental program and the estimation of the results was carried out in co-operation with KFA-Juelich and the Technische Hochschule Aachen.

  16. First Ideas Towards the Super-Conducting Magnet Design for the HESR at FAIR

    Eichhorn, Ralf; Gussen, Achim; Martin, Siegfried

    2005-01-01

    The Forschungszentrum Juelich has taken the leadership of a consortium being responsible for the design of the HESR going to be part of the FAIR project at GSI. The HESR is a 50 Tm storage ring for antiprotons, based on a super-conducting magnet technology. On basis of the RHIC Dipole D0 (3.6 T), the magnet design for the HESR has started recently. One key issue will be a very compact layout because of the rather short magnets (been 1.82 m for the dipoles and 0.5 m for the other magnets). This paper will present first ideas of the magnetic and cryogenic layout, give a status report on the achievements so far and discuss the need and possible solutions for a bent magnet with a radius of curvature of 13.2 m.

  17. Raising the four downcomers in the reactor aluminium tank of the FRJ-2 research reactor as an example of the execution of complicated work in the region of high radiation levels

    Nickel, M.; Schmitz, J.; Wolters, J.

    1975-02-01

    As a result of the planned power increase from 15 MW to 25 MW, a new emergency cooling system had to be installed in the research reactor FRJ-2 of the KFA Juelich, which called for an extension of the four standpipes in the reactor tank by 57 mm. Due to the high radiation level in the reactor tank, new techniques had to be found allowing aluminium rings of corresponding height to be welded onto the top part of the standpipes by remotecontrolled welding; moreover, the welded parts were then to be protected by a bandage made of high-quality steel. The development work was carried out in the KFA and this report gives an account of the technique applied and the results obtained. (author)

  18. The IKARUS instrument

    Gerster, H.J.; Stein, G.

    1994-01-01

    When the Federal Government decided on a 25% reduction of CO 2 emissions till 2005 in 1990 the necessity resulted that an instrument has to be developed for the analysis and assessment of the ecological, economic and energetic impact of different reduction strategies. The development task was awarded by the BMFT to the Research Centre Juelich in cooperation with well-known institutions of energy system research. The total instrument is scheduled to be finished by the end of 1994. For the decentral use of the instrument by a wide specialist public the developed models and data banks which are equipped with a user-friendly surface are suited for larger PCs (486, 16 MB RAM/500-1000 MB ROM). (orig.) [de

  19. Cross section ratio and angular distributions of the reaction p + d → {sup 3}He + η at 48.8 MeV and 59.8 MeV excess energy

    Adlarson, P.; Calen, H.; Fransson, K.; Gullstroem, C.O.; Heijkenskjoeld, L.; Hoeistad, B.; Johansson, T.; Marciniewski, P.; Redmer, C.F.; Wolke, M.; Zlomanczuk, J. [Uppsala University, Division of Nuclear Physics, Department of Physics and Astronomy, Box 516, Uppsala (Sweden); Augustyniak, W.; Marianski, B.; Morsch, H.P.; Trzcinski, A.; Zupranski, P. [National Centre for Nuclear Research, Department of Nuclear Physics, Warsaw (Poland); Bardan, W.; Ciepal, I.; Czerwinski, E.; Hodana, M.; Jany, A.; Jany, B.R.; Jarczyk, L.; Kamys, B.; Kistryn, S.; Krzemien, W.; Magiera, A.; Moskal, P.; Ozerianska, I.; Podkopal, P.; Rudy, Z.; Skurzok, M.; Smyrski, J.; Wronska, A.; Zielinski, M.J. [Jagiellonian University, Institute of Physics, Krakow (Poland); Bashkanov, M.; Clement, H.; Doroshkevich, E.; Perez del Rio, E.; Pricking, A.; Skorodko, T.; Wagner, G.J. [Eberhard-Karls-Universitaet Tuebingen, Physikalisches Institut, Tuebingen (Germany); Physikalisches Institut der Universitaet Tuebingen, Kepler Center fuer Astro- und Teilchenphysik, Tuebingen (Germany); Bergmann, F.S.; Demmich, K.; Goslawski, P.; Huesken, N.; Khoukaz, A.; Passfeld, A.; Taeschner, A. [Westfaelische Wilhelms-Universitaet Muenster, Institut fuer Kernphysik, Muenster (Germany); Berlowski, M.; Stepaniak, J. [National Centre for Nuclear Research, High Energy Physics Department, Warsaw (Poland); Bhatt, H.; Lalwani, K.; Varma, R. [Indian Institute of Technology Bombay, Department of Physics, Mumbai, Maharashtra (India); Buescher, M.; Engels, R.; Goldenbaum, F.; Hejny, V.; Khan, F.A.; Lersch, D.; Lorentz, B.; Maier, R.; Ohm, H.; Prasuhn, D.; Schadmand, S.; Sefzick, T.; Stassen, R.; Sterzenbach, G.; Stockhorst, H.; Stroeher, H.; Wurm, P.; Zurek, M. [Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (Germany); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (Germany); Coderre, D.; Ritman, J. [Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (Germany); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (Germany); Ruhr-Universitaet Bochum, Institut fuer Experimentalphysik I, Bochum (Germany); Erven, A.; Erven, W.; Kemmerling, G.; Kleines, H.; Wuestner, P. [Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (Germany); Forschungszentrum Juelich, Zentralinstitut fuer Engineering, Elektronik und Analytik, Juelich (Germany); Eyrich, W.; Hauenstein, F.; Krapp, M.; Zink, A. [Friedrich-Alexander-Universitaet Erlangen-Nuernberg, Physikalisches Institut, Erlangen (Germany); Fedorets, P. [Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (Germany); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (Germany); State Scientific Center of the Russian Federation, Institute for Theoretical and Experimental Physics, Moscow (Russian Federation); Foehl, K. [Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Giessen (Germany); Goswami, A. [Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (Germany); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (Germany); Indian Institute of Technology Indore, Department of Physics, Indore, Madhya Pradesh (India); Grigoryev, K. [Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (Germany); RWTH Aachen, III. Physikalisches Institut B, Physikzentrum, Aachen (Germany); Petersburg Nuclear Physics Institute, High Energy Physics Division, Leningrad district (Russian Federation); Kirillov, D.A.; Piskunov, N.M. [Joint Institute for Nuclear Physics, Veksler and Baldin Laboratory of High Energiy Physics, Moscow region (Russian Federation); Klos, B.; Stephan, E.; Weglorz, W. [University of Silesia, August Chelkowski Institute of Physics, Katowice (Poland); Kulessa, P.; Pysz, K.; Siudak, R.; Szczurek, A. [Polish Academy of Sciences, The Henryk Niewodniczanski Institute of Nuclear Physics, Krakow (Poland); Kupsc, A.; Pszczel, D. [Uppsala University, Division of Nuclear Physics, Department of Physics and Astronomy, Box 516, Uppsala (Sweden); National Centre for Nuclear Research, High Energy Physics Department, Warsaw (Poland); Mikirtychiants, M. [Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (Germany); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (DE); Ruhr-Universitaet Bochum, Institut fuer Experimentalphysik I, Bochum (DE); Petersburg Nuclear Physics Institute, High Energy Physics Division, Leningrad district (RU); Pyszniak, A. [Uppsala University, Division of Nuclear Physics, Department of Physics and Astronomy, Box 516, Uppsala (SE); Jagiellonian University, Institute of Physics, Krakow (PL); Roy, A. [Indian Institute of Technology Indore, Department of Physics, Indore, Madhya Pradesh (IN); Sawant, S. [Indian Institute of Technology Bombay, Department of Physics, Mumbai, Maharashtra (IN); Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (DE); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (DE); Serdyuk, V. [Forschungszentrum Juelich, Institut fuer Kernphysik, Juelich (DE); Forschungszentrum Juelich, Juelich Center for Hadron Physics, Juelich (DE); Joint Institute for Nuclear Physics, Dzhelepov Laboratory of Nuclear Problems, Moscow region (RU); Sopov, V. [State Scientific Center of the Russian Federation, Institute for Theoretical and Experimental Physics, Moscow (RU); Yamamoto, A. [High Energy Accelerator Research Organization KEK, Tsukuba, Ibaraki (JP); Yurev, L. [Joint Institute for Nuclear Physics, Dzhelepov Laboratory of Nuclear Problems, Moscow region (RU); Zabierowski, J. [National Centre for Nuclear Research, Department of Cosmic Ray Physics, Lodz (PL); Collaboration: WASA-at-COSY Collaboration

    2014-06-15

    We present new data for angular distributions and on the cross section ratio of the p+d → {sup 3}He + η reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum Juelich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q = 20 MeV and Q = 60 MeV, which might indicate the variation of the production mechanism within this energy interval. (orig.)

  20. Gasification of coal using nuclear process heat. Chapter D

    Schilling, H.-D.; Bonn, B.; Krauss, U.

    1979-01-01

    In the light of the high price of coal and the enormous advances made recently in nuclear engineering, the possibility of using heat from high-temperature nuclear reactors for gasification processes was discussed as early as the 1960s. The advantages of this technology are summarized. A joint programme of development work is described, in which the Nuclear Research Centre at Juelich is aiming to develop a high-temperature reactor which will supply process heat at as high a temperature as possible, while other organizations are working on the hydrogasification of lignites and hard coals, and steam gasification. Experiments are at present being carried out on a semi-technical scale, and no operational data for large-scale plants are available as yet. (author)

  1. Description of the moderator systems for the ESS project

    Stendal, K.

    1996-10-01

    This paper describes a suggestion for the arrangement of the Cold Neutron Sources for the two targets in the ESS project. (European Spallation Source). The suggestion is based upon the technique of the existing cold neutron sources at Risoe in Denmark, HMI and Geestacht in Germany. As moderating media all of them use H{sub 2} in supercritical condition, circulated by blowers, and the safety of the systems is based upon the triple-containment philosophy. This seems to be the most convenient principle to use near the ESS targets, as it provides a larger degree of freedom with respect to the arrangement of these sources and pipe connections to the chambers, especially because the space is limited and access to the target is relatively complicated. The moderator chambers have been designed by KFA, Juelich and the rest of the arrangement by Risoe, DK. The price calculations used for the ESS project are based upon this arrangement. (au).

  2. Cross section ratio and angular distributions of the reaction p + d → 3He + η at 48.8 MeV and 59.8 MeV excess energy

    Adlarson, P.; Calen, H.; Fransson, K.; Gullstroem, C.O.; Heijkenskjoeld, L.; Hoeistad, B.; Johansson, T.; Marciniewski, P.; Redmer, C.F.; Wolke, M.; Zlomanczuk, J.; Augustyniak, W.; Marianski, B.; Morsch, H.P.; Trzcinski, A.; Zupranski, P.; Bardan, W.; Ciepal, I.; Czerwinski, E.; Hodana, M.; Jany, A.; Jany, B.R.; Jarczyk, L.; Kamys, B.; Kistryn, S.; Krzemien, W.; Magiera, A.; Moskal, P.; Ozerianska, I.; Podkopal, P.; Rudy, Z.; Skurzok, M.; Smyrski, J.; Wronska, A.; Zielinski, M.J.; Bashkanov, M.; Clement, H.; Doroshkevich, E.; Perez del Rio, E.; Pricking, A.; Skorodko, T.; Wagner, G.J.; Bergmann, F.S.; Demmich, K.; Goslawski, P.; Huesken, N.; Khoukaz, A.; Passfeld, A.; Taeschner, A.; Berlowski, M.; Stepaniak, J.; Bhatt, H.; Lalwani, K.; Varma, R.; Buescher, M.; Engels, R.; Goldenbaum, F.; Hejny, V.; Khan, F.A.; Lersch, D.; Lorentz, B.; Maier, R.; Ohm, H.; Prasuhn, D.; Schadmand, S.; Sefzick, T.; Stassen, R.; Sterzenbach, G.; Stockhorst, H.; Stroeher, H.; Wurm, P.; Zurek, M.; Coderre, D.; Ritman, J.; Erven, A.; Erven, W.; Kemmerling, G.; Kleines, H.; Wuestner, P.; Eyrich, W.; Hauenstein, F.; Krapp, M.; Zink, A.; Fedorets, P.; Foehl, K.; Goswami, A.; Grigoryev, K.; Kirillov, D.A.; Piskunov, N.M.; Klos, B.; Stephan, E.; Weglorz, W.; Kulessa, P.; Pysz, K.; Siudak, R.; Szczurek, A.; Kupsc, A.; Pszczel, D.; Mikirtychiants, M.; Pyszniak, A.; Roy, A.; Sawant, S.; Serdyuk, V.; Sopov, V.; Yamamoto, A.; Yurev, L.; Zabierowski, J.

    2014-01-01

    We present new data for angular distributions and on the cross section ratio of the p+d → 3 He + η reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum Juelich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q = 20 MeV and Q = 60 MeV, which might indicate the variation of the production mechanism within this energy interval. (orig.)

  3. Methyl mercury in terrestrial compartments

    Stoeppler, M.; Burow, M.; Padberg, S.; May, K.

    1993-09-01

    On the basis of the analytical methodology available at present the state of the art for the determination of total mercury and of various organometallic compounds of mercury in air, precipitation, limnic systems, soils, plants and biota is reviewed. This is followed by the presentation and discussion of examples for the data obtained hitherto for trace and ultratrace levels of total mercury and mainly methyl mercury in terrestrial and limnic environments as well as in biota. The data discussed stem predominantly from the past decade in which, due to significant methodological progress, many new aspects were elucidated. They include the most important results in this area achieved by the Research Centre (KFA) Juelich within the project 'Origin and Fate of Methyl Mercury' (contracts EV4V-0138-D and STEP-CT90-0057) supported by the Commission of the European Communities, Brussels. (orig.) [de

  4. Hyperon interaction in free space and nuclear matter

    Dhar, Madhumita; Lenske, Horst [Institute for Theoretical Physics, Justus- Liebig-University Giessen (Germany)

    2015-07-01

    Baryon-baryon interactions within the SU(3)-octet are investigated in free space and nuclear matter.A meson exchange model based on SU(3) symmetry is used for determining the interaction. The Bethe-Salpeter equations are solved in a 3-D reduction scheme. In-medium effect has been incorporated by including a two particle Pauli projector operator in the scattering equation. The coupling of the various channels of total strangeness S and conserved total charge is studied in detail. Special attention is paid to the physical thresholds. The density dependence of interaction is clearly seen in the variation of the in-medium low-energy parameters. The approach is compared to descriptions derived from chiral-EFT and other meson-exchange models e.g. the Nijmegen and the Juelich model.

  5. Treatment of pauli exclusion operator in G-matrix calculations for hypernuclei

    Kuo, T.T.S.; Hao, Jifa

    1995-01-01

    We discuss a matrix-inversion method for treating the Pauli exclusion operator Q in the hyperon-nucleon G-matrix equation for hypernuclei such as Λ 16 O. A model space consisted of shell-model wave functions is employed. We discuss that it is preferable to employ a free-particle spectrum for the intermediate states of the G matrix. This leads to the difficulty that the G-matrix intermediate states are plane waves and on this representation the Pauli operator Q has a rather complicated structure. A matrix-inversion method for over-coming this difficulty is examined. To implement this method it is necessary to employ a so-called n 3Λ truncation approximation. Numerical calculations using the Juelich B tilde and A tilde potentials have been performed to study the accuracy of this approximation. (author)

  6. Manipulator-controlled manufacturing and on-line testing of composite materials. Subproject: Development and trial of test techniques. Final report

    Nuding, W.; Schroeder, P.

    1991-10-01

    ZAT Juelich was in charge of the assessment of the basic nondestructive materials testing requirements relevant to manufacturing, the application and testing of the hardware and software developed by ITS, the supply of the required X-ray systems including sensors and basic manipulation systems, microfocus X-raying of the newly developed special welding materials, hard-facing parameter studies applicable to components which consist of different composite materials and are characterized by complex geometries, and computer-aided evaluation and scanning of components. The ITS developments were based on nondestructive radiography because radiography provides reliable data about the types, location and sizes of defects. The test object is X-rayed by means of an X-ray tube, and radiograph is displayed on a TV monitor by means of an image intensifying TV chain after improvement of the signal-to-noise ratio by an image processing system. (orig.) [de

  7. The behaviour of transport from the fission products caesium and strontium in coated particles for high temperature reactors under irradiation conditions

    Zoller, P.

    1976-07-01

    At first survey is given about existing knowledge of the behaviour of caesium and strontium fission product transport in coated particles. In order to describe the complicated fission product transport mechanisms under irradiation conditions a suitable calculating model (SLIPPER) is taken over and modified to the special problems of an irradiation experiment. Fundamentally, the fission product transport is represented by the two contributions of diffusion and recoil, at which the diffusion is described by effective diffusion coefficients. In difference of that the possibility of a two-phase-diffusion is examined for the Cs diffusion in the fuel kernel. The model application on measuring results from irradiation experiments of KFA-Juelich and Mol-Belgien allowed the explanation from the characteristic of fission product transport in coated particles under irradiation conditions and produced effective diffusion coefficients for the fission products Cs and Sr. (orig.) [de

  8. Noise thermometer

    Von Brixy, H.; Kakuta, Tsunemi.

    1996-03-01

    The noise thermometry (NT) is a temperature measuring method by which the absolute temperature measurement can be performed with a very high accuracy and without any influence of ambient environments and of the thermal history of its NT sensor (electric resistor). Hence it is quite suitable for application as a standard thermometry to the in-situ temperature calibration of incore thermocouples. The KFA Juelich had played a pioneering role in the development of NT and applied the results successfully to the AVR for testing its feasibility. In this report, all about the NT including its principle, sensor elements and system configurations are presented together with the experiences in the AVR and the results of investigation to apply it to high temperature measurement. The NT can be adopted as a standard method for incore temperature measurement and in situ temperature calibration in the HTTR. (author). 85 refs

  9. Observation of K sup + d correlations from pA collisions

    Koptev, V; Nekipelov, M; Büscher, M; Hartmann, M; Hejny, V; Koch, H R; Ohm, H; Schleichert, R; Sibirtsev, A A; Sistemich, K; Ströher, H; Watzlawik, K H; Dymov, S; Lang, N; Petrus, A; Rudy, Z

    2003-01-01

    Results of a first experiment on (K sup + sup p) and (K sup + sup d) correlations from proton-carbon (pC) and proton-deuteron (pd) interactions at beam energies above and much below the threshold for elementary kaon production in nucleon-nucleon reactions (T sub N sub N =1580 MeV) are discussed. These data, obtained with the ANKE spectrometer at COSY-Juelich, provide first direct evidence for K sup + production via the two-step mechanism and an indication for a cluster mechanism. It is shown that both processes contribute significantly in pC collisions at 1200 MeV, while they are strongly suppressed at 2300 MeV and also in pd-interactions at 1344 MeV. It is emphasized that the underlying kinematics can be exploited to distinguish between these reaction mechanisms. (orig.)

  10. An energy-independent dose rate meter for beta and gamma radiation

    Heinzelmann, M.; Keller, M.

    1986-01-01

    An easy to handle dose rate meter has been developed at the Juelich Nuclear Research Centre with a small probe for the energy-independent determination of the dose rate in mixed radiation fields. The dose rate meter contains a small ionisation chamber with a volume of 15.5 cm 3 . The window of the ionisation chamber consists of an aluminised plastic foil of 7 mg.cm -2 . The dose rate meter is suitable for determining the dose rate in skin. With a supplementary depth dose cap, the dose rate can be determined in tissue at a depth of 1 cm. The dose rate meter is energy-independent within +-20% for 147 Pm, 204 Tl and 90 Sr/ 90 Y beta radiation and for gamma radiation in the energy range above 35 keV. (author)

  11. Status of COSY

    Maier, R.; Bechstedt, U.; Dietrich, J.; Hacker, U.; Martin, S.; Prasuhn, D.; Rossen, P. v.; Stockhorst, H.; Toelle, R.

    1994-01-01

    COSY Juelich is a cooler synchrotron and storage ring with a proton momentum range from 270 to 3300 MeV/c. It has been conceived to deliver high precision beams for medium energy physics. To accomplish this goal two cooling systems are used. An electron-cooling system that reaches up to a momentum of 645 MeV/c and a stochastic cooling system that covers the upper momentum range from 1500 to 3300 MeV/c. Since its inauguration in April 1993 substantial progress in developing beams for the experiments has been achieved and the physics program has started with first measurements. Proton beams in a wide energy range have been delivered to internal as well external experiments. Important design features of the machine and results of the commissioning process are presented. (orig.)

  12. QQDDQ magnet spectrometer 'BIG KARL'

    Martin, S A; Hardt, A; Meissburger, J; Berg, G P.A.; Hacker, U; Huerlimann, W; Roemer, J G.M.; Sagefka, T; Retz, A; Schult, O W.B.

    1983-09-01

    A magnet spectrometer consisting of two quadrupoles, two dipole magnets and another larger quadrupole in front of the detector was designed and installed at the nuclear research institute of the KFA Juelich. It has been used for charged-particle spectroscopy at the isochronous cyclotron since early 1979. Special features of the spectrometer are variable and high dispersion, coils for higher order field corrections in the dipole magnets and a focal plane perpendicular to the optical axis. A large mass-energy product of mE/q/sup 2/ < 540 u x MeV, an angular acceptance of d..cap omega..<12.5 msr, a high resolving power of p/..delta..p up to 3 x 10/sup 4/ and the possibility of kinematical corrections up to K=0.8 make the instrument a very versatile tool for many experiments in the fields of nuclear and atomic physics. 51 references.

  13. Status of COSY

    Maier, R [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Bechstedt, U [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Dietrich, J [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Hacker, U [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Martin, S [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Prasuhn, D [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Rossen, P v [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Stockhorst, H [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany); Toelle, R [Inst. fuer Kernphysik, Forschungszentrum Juelich GmbH (Germany)

    1994-09-01

    COSY Juelich is a cooler synchrotron and storage ring with a proton momentum range from 270 to 3300 MeV/c. It has been conceived to deliver high precision beams for medium energy physics. To accomplish this goal two cooling systems are used. An electron-cooling system that reaches up to a momentum of 645 MeV/c and a stochastic cooling system that covers the upper momentum range from 1500 to 3300 MeV/c. Since its inauguration in April 1993 substantial progress in developing beams for the experiments has been achieved and the physics program has started with first measurements. Proton beams in a wide energy range have been delivered to internal as well external experiments. Important design features of the machine and results of the commissioning process are presented. (orig.)

  14. HTGR programme in the United States of America

    Fox, J.E.

    1991-01-01

    The HTGR is being developed by the US Department of Energy within the Division of HTGRs is reported. Fuel design, development and demonstration activities are being conducted by General Atomics and Oak Ridge National Laboratory. During FY-1990 the US continued work in cooperative projects with the KFA-Forschungszentrum Juelich and the Japan Atomic Energy Research Institute on post irradiation examination of fuel capsules and continued the Fission Product Transport Test Program with the French Commissariat a l'Energie Atomique in the COMEDIE in-pile loop at the SILOE reactor at Grenoble. Other activities included installation of the high temperature core-conduction-cooldown test furnace at ORNL which will be used for testing of irradiated fuel compacts under accident conditions. Finally, the US fuel performance experts participated in the MHTGR Cost Reduction Study which is a major effort within the US commercial MHTGR program. 1 tab

  15. Energy. Supermaterial for solar cells, membranes against the global warming, energy conservation in the greenhouse; Energie. Supermaterial fuer Solarzellen, Membranen gegen die globale Erwaermung, Energiesparen im Treibhaus

    Roegener, Wiebke; Frick, Frank; Tillemans, Axel; Stahl-Busse, Brigitte

    2010-07-01

    A kaleidoscope of pictures presents highlights from the research at the Forschungszentrum Juelich - from moving into a new computer era over the development of a detector for dangerous liquids up to a new method of treatment against tinnitus. The highlights of this brochure are: (a) An interview with he director of the Oak Ridge National Laboratory on the energy mix of the future; (b) Environment friendly power generation by means of fuel cells; (c) Transfer of knowledge from fusion experiments to greater plants using a supercomputer; (d) Development of powerful batteries for electrically powered cars by means of the know-how from fuel cell research; (e) Investigation of contacting used fuel elements with water; (f) Reduction if energy consumption in a greenhouse using a combination of glass and foils; (g) News on the energy research and environmental research.

  16. LAP-ND: a new instrument for vector polarization analysis and neutron depolarization measurements at FRJ-2

    Ioffe, Alexander; Bussmann, Klaus; Dohmen, Ludwig; Axelrod, Leonid; Gordeev, Gennadi; Brueckel, Thomas

    2004-07-15

    The method of vector analysis of the neutron polarization allows for the determination of both the magnitude and the direction of the magnetization vector in the sample. A directional distribution of the magnetization in a sample results in a spread of the direction of the polarization vector in space and thus in the depolarization of the incident beam. A new neutron depolarization set up is installed at the research reactor FRJ-2 of the Forschungszentrum Juelich. The main feature of the set up is the use of rather long wavelength, {lambda}=(4-6.5) A, neutrons thus allowing for a significant increase in the sensitivity of depolarization measurements. The set up uses a non-cryogenic zero-field sample chamber with the residual magnetic field of about 1 mG. It will be used for the determination of the sample magnetization at mesoscopic and macroscopic levels and for the study of magnetic phase transitions, magnetic nanostructures, magnetic glasses, etc.

  17. Solubility of iron in liquid lead

    Ali-Khan, I.

    1981-01-01

    The use of liquid lead in high temperature chemical and metallurgical processes is well known. The structural materials applied for the containment of these processes are either iron base alloys or possess iron as an alloying element. Besides that, lead itself is alloyed in some steels to achieve some very useful properties. For understanding the effect of liquid lead in such structural materials, it is important to determine the solubility of iron in liquid lead which would also be indicative of the stability of these alloys. At the institute of reactor materials of KFA Juelich, investigations have been conducted to determine the solubility of iron in liquid lead up to a temperature of about 1000 0 C. In this presentation the data concerning the solubility of iron in liquid lead are brought up to date and discussed including the results of our previous investigations. (orig.)

  18. User's manual for ASTERIX-2: A two-dimensional modular code system for the steady state and xenon transient analysis of a pebble bed high temperature reactor

    Wu, T.; Cowan, C.L.; Lauer, A.; Schwiegk, H.J.

    1982-03-01

    The ASTERIX modular code package was developed at KFA Laboratory-Juelich for the steady state and xenon transient analysis of a pebble bed high temperature reactor. The code package was implemented on the Stanford Linear Accelerator Center Computer in August, 1980, and a user's manual for the current version of the code, identified as ASTERIX-2, was prepared as a cooperative effort by KFA Laboratory and GE-ARSD. The material in the manual includes the requirements for accessing the program, a description of the major subroutines, a listing of the input options, and a listing of the input data for a sample problem. The material is provided in sufficient detail for the user to carry out a wide range of analysis from steady state operations to the xenon induced power transients in which the local xenon, temperature, buckling and control feedback effects have been incorporated in the problem solution. (orig.)

  19. Model experiments on depressurisation accidents in nuclear process heat plants (HTGR)

    Fritsching, G.; Wolf, G.

    1981-01-01

    The analysis of depressurisation accidents requires the use of digital computer programs to find out the dynamic loads acting on the plant structures. Because of the importance of such accidents in safety and licensing procedures of nuclear process heat plants, it is necessary to compare these computer results with suitable experiments to show the accuracy and the limits of the programs in question. For this purpose a series of depressurisation experiments has been started at INTERATOM on a small scale model of a primary loop of a nuclear process heat plant. Using the results of these experiments three different computer programs were tested with good success. The development of the experimental program and the estimation of the results was carried out in co-operation with KFA-Juelich and the Technische Hochschule Aachen

  20. Determination of effective cross sections and production rates for tritium in the irradiation experiment TRIDEX

    Weise, L.

    1986-04-01

    In the framework of the development of a fusion reactor blanket the irradiation experiment TRIDEX (Tritium Recovery Irradiation DIDO Experiment) takes place at the Juelich Research Reactor FRJ-2 (DIDO). For this equipment the required neutronic calculations have been performed. The aim was the determination of the neutron spectrum and several therefrom derived integral parameters for the irradiation positions in interest. From the calculated effective cross sections for the formation of Tritium resulting from irradiated Lithium samples on one hand and from measured neutron flux densities on the other hand, all needed quantities of the Tritium production could be determined. The calculation of the neutron spectrum has been performed in a two-dimensional x-y-geometry. The neutron flux densities have been gained by gamma-spectrometric measurement of the activities in irradiated activation samples. (orig.) [de

  1. Report on the interpretation of critical experiments in the Siemens-Argonaut-Reactor Graz to study water ingress into spherical elements. Ergebnisbericht zur Auslegung kritischer Experimente am Siemens-Argonaut-Reaktor Graz zum Studium des Wassereinbruches im Kugelhaufen

    Schuerrer, F [Technische Univ., Graz (Austria). Inst. fuer Theoretische Physik und Reaktorphysik; Neef, R D [Kernforschungsanlage Juelich G.m.b.H. (Germany, F.R.). Inst. fuer Reaktorentwicklung

    1979-04-15

    The experiments described are of interest in the study of water contamination in HTR fuel elements. The Siemens Argonaut Reactor (SAR) has been considered as a research tool for a simulation experiment. Following a brief description of the SAR, planned programs are discussed in 'dry' and 'wet' cores. Detector foil types and locations are noted. A theoretical model is developed and nuclide concentrations estimated in the various spectral zones. Reactivity calculations have been made and are summarised for various H{sub 2}O percentage concentrations. The discussion is supported by simplified core layout diagrams and graphs of core flux distributions. Neutron diffusion and spectra calculations are referenced to computer programs used by KFA-Juelich, published elsewhere, and include GAM, THERMOS, MUPO and EXTERMINATOR-2. (G.C.)

  2. Concept for calculating dose rates from activated groundwater at accelerator sites

    Prolingheuer, N; Vanderborght, J; Schlögl, B; Nabbi, R; Moormann, R

    Licensing of particle accelerators requires the proof that the groundwater outside of the site will not be significantly contaminated by activation products formed below accelerator and target. In order to reduce the effort for this proof, a site independent simplified but conservative method is under development. The conventional approach for calculation of activation of soil and groundwater is shortly described on example of a site close to Forschungszentrum Juelich, Germany. Additionally an updated overview of a data library for partition coefficients for relevant nuclides transported in the aquifer at the site is presented. The approximate model for transport of nuclides with ground water including exemplary results on nuclide concentrations outside of the site boundary and of resulting effective doses is described. Further applications and developments are finally outlined.

  3. User's manual for ASTERIX-2: a two-dimensional modular-code system for the steady-state and xenon-transient analysis of a pebble-bed high-temperature reactor

    Lauer, A.; Schwiegk, H.J.; Wu, T.; Cowan, C.L.

    1982-03-01

    The ASTERIX modular code package was developed at KFA Laboratory-Juelich for the steady state and xenon transient analysis of a pebble bed high temperature reactor. The code package was implemented on the Stanford Linear Accelerator Center Computer in August, 1980, and a user's manual for the current version of the code, identified as ASTERIX-2, was prepared as a cooperative effort by KFA Laboratory and GE-ARSD. The material in the manual includes the requirements for accessing the program, a description of the major subroutines, a listing of the input options, and a listing of the input data for a sample problem. The material is provided in sufficient detail for the user to carry out a wide range of analyses from steady state operations to the xenon induced power transients in which the local xenon, temperature, buckling and control feedback effects have been incorporated in the problem solution

  4. Preliminary design analysis of the ALT-II limiter for TEXTOR

    Koski, J.A.; Boyd, R.D.; Kempka, S.M.; Romig, A.D. Jr.; Smith, M.F.; Watson, R.D.; Whitley, J.B.; Conn, R.W.; Grotz, S.P.

    1984-01-01

    Installation of a large toroidal belt pump limiter, Advanced Limiter Test II (ALT-II), on the TEXTOR tokamak at Juelich, FRG is anticipated for early 1986. This paper discusses the preliminary mechanical design and materials considerations undertaken as part of the feasibility study phase for ALT-II. Since the actively cooled limiter blade is the component in direct contact with the plasma edge, and thus subject to the severe plasma environment, most preliminary design efforts have concentrated on analysis of the blade. The screening process which led to the recommended preliminary design consisting of a dispersion strenghthened copper or OFHC copper cover plate over an austenitic stainless steel base plate is discussed. A 1 to 3 mm thick low atomic number coating consisting of a graded plasma-sprayed Silicon Carbide-Aluminium composite is recommended subject to further experiment and evaluation. Thermal-hydraulic and stress analyses of the limiter blade are also discussed. (orig.)

  5. High-temperature reactor developments in the Netherlands

    Schram, R.P.C.; Cordfunke, E.H.P.; Heek, A.I. van.

    1996-01-01

    The high-temperature reactor development in the Netherland is embedded in the WHITE reactor program, in which several Dutch research institutes and engineering companies participate. The activities within the WHITE program are focused on the development of a small scale HTS for combined heat and power generation. In 1995, design choices for a pebble bed reactor were made at ECN. The first concept HTR will gave a closed cycle helium turbine and a power level of 40 MWth. It is intended to make the market introduction of a commercially competitive HTR feasible. The design will be an optimization of the Peu-a-Peu (PAP) concept of KFA Juelich. Computer codes necessary for the evaluation of reactor physics aspects of this reactor are developed in cooperation with international partners. An evaluation of a 20 MWth PAP concept showed that the maximum fuel termmperature after depressurization does not exceed 1300 C. (orig.)

  6. Theoretical studies of multistep processes, isospin effects in nuclear scattering, and meson and baryon interactions in nuclear physics: Annual progess report, 1 May 1988--30 April 1989

    Landau, R.H.; Madsen, V.A.

    1988-01-01

    A progress report is presented for DOE grant FG06-86ER40283 supporting theoretical studies in nuclear and particle physics at Oregon State University. The research was led by Professors Landau and Madsen, and carried out in collaboration with graduate students in Corvallis, and scientists at LLNL-Livermore, TRIUMF, KFA-Juelich, Purdue University, and Florida State University. The studies include meson-exchange-current effects, quark effects, and relativistic (Dirac) effects deduced from spin observables in p- 3 He scattering, atomic and nuclear Gamow states in momentum space of kaons and antiprotons, and charge-symmetry violation in pion scattering. Additional studies include microscopic optical potential calculations, multiple step processes, and differences in neutron and proton multipole matrix elements and transition densities in low lying collective states and in giant resonances. 13 refs

  7. HTGR fuel cycle

    1987-08-01

    In the spring of 1987, the HTGR fuel cycle project has been existing for ten years, and for this reason a status seminar has been held on May 12, 1987 in the Juelich Nuclear Research Center, that gathered the participants in this project for a discussion on the state of the art in HTGR fuel element development, graphite development, and waste management. The papers present an overview of work performed so far and an outlook on future tasks and goals, and on taking stock one can say that the project has been very successful so far: The HTGR fuel element now available meets highest requirements and forms the basis of today's HTGR safety philosophy; research work on graphite behaviour in a high-temperature reactor has led to complete knowledge of the temperature or neutron-induced effects, and with the concept of direct ultimate waste disposal, the waste management problem has found a feasible solution. (orig./GL) [de

  8. Combined application of numerical simulation models and fission tracks analysis in order to determine the history of temperature, subsidence and lifting of sedimentary basins. A case study from the Ruhr Coal basin inWest Germany; Die kombinierte Anwendung numerischer Simulationsmodelle und Spaltspurenuntersuchungen zur Entschluesselung der Temperatur-, Subsidenz- und Hebungsgeschichte von Sedimentbecken - Ein Fallbeispiel aus dem Ruhrkohlenbecken Westdeutschlands

    Karg, H. [Forschungszentrum Juelich (Germany). Inst. fuer Erdoel und organische Geochemie; Littke, R. [RWTH Aachen (Germany); Bueker, C. [Univ. Bern (Switzerland). Inst. fuer Geologie

    1998-12-31

    The Ruhr Coal basin is one of the globally best known sedimentary basins. According to classical, established the Ruhr Basin is a typical foreland molasse basins. The thermal history (heating and cooling) and the structural and sedimentary development since the formation of the basin, i.e. subsidence and lifting and erosion are of the first importance for the potential formation of hydrocarbons. In order to quantify these processes, two-dimensional numerical simulation models (based on geological and seismological sections) of the Ruhr basin were developed from which one could conclude the heat flow at the time of maximum basin depth after variscis orogenesis, maximum temperatures of individual strata sections and thickness of eroded strata. The PetroMod program package of the company IES/Juelich was used for these analyses. Finite-element-grids enable mathematican mapping and reconstruction of complex geological structures and processes. The models on temperature history are calibrated by comparing measured and calculated carbonification (vitrinite reflection) data. (orig./MSK). [Deutsch] Das Ruhrkohlenbecken stellt weltweit eines der am besten erforschten Sedimentbecken dar. Nach klassischen und etablierten Beckenmodellen kann das Ruhrbecken als typisches Vorlandmolassebecken angesehen werden. Besonders relevant fuer die potentielle Bildung von Kohlenwasserstoffen sind in erster Linie die thermische Geschichte (Aufheizung und Abkuehlung) sowie die strukturelle und sedimentaere Entwicklung seit der Beckenbildung, sprich Versenkungs-, Hebungs- und Erosionsprozesse. Um solche Prozesse zu quantifizieren, wurden im Ruhrbecken zweidimensionale (d.h. auf der Grundlage von geologischen und seismischen Sektionen) numerische Simulationsmodelle entwickelt, die Aufschluss ueber Waermefluesse zur Zeit der maximalen Beckeneintiefung im Anschluss an die variszische Orogenese, erreichte Maximaltemperaturen einzelner Schichtglieder sowie die Maechtigkeit erodierter Schichten im

  9. Nuclear process heat at high temperature: Application, realization and development programme

    Sammeck, K.H.; Fischer, R.

    1976-01-01

    Studies in the Federal Republic of Germany (FRG), the USA and the United Kingdom have shown that high-temperature helium energy from an HTR can advantageously be utilized for coal gasification and other fossil fuel conversion processes, and that a substantial demand for substitute natural gas (SNG) can be expected in the future. These results are based on plant design studies, economic assessments and basic development efforts in the field of coal gasification with nuclear heat, which in the FRG were carried out by Arbeitsgemeinschaft Nukleare Prozesswaerme (ANP)-members, HRB and KFA Juelich. Nuclear process plants are based on different gasification processes, resulting in different concepts of the nuclear heat system. In the case of hydro-gasification it is expected that steam reformers, arranged within the primary circuit of the reactor, will be heated directly by the primary helium. In the case of steam gasification, the high-temperature energy must be transferred to the gasification process via an intermediate circuit which is coupled to a gasifier outside the containment. In both cases the design of the nuclear reactor resembles an HTR for electricity generation. The main objectives of the development of nuclear process heat are to increase the helium outlet temperature of the reactor up to 950 0 C, to develop metallic alloys for high-temperature components such as heat exchangers, to design and construct a hot-gas duct, a steam reformer and a helium-helium heat exchanger and to develop the gasification processes. The nuclear safety regulations and the interface problems between the reactor, the process plant and the electricity generating plant have to be considered thoroughly. The Arbeitsgemeinschaft Nukleare Prozesswaerme and HRB started a development programme, in close collaboration with KFA Juelich, which will lead to the construction of a prototype plant for coal gasification with nuclear heat within 5 to 5 1/2 years. A survey of the main objectives

  10. Inelastic neutron scattering and spectral measurements of advanced cold moderator materials

    Conrad, H.; Prager, M.; Nuenighoff, K.; Pohl, C.; Kuhs, W.F.

    2004-01-01

    Inelastic neutron scattering with emphasis on energetically low lying modes as well as cold neutron leakage measurements have been performed on four prospective advanced cold moderator materials. Employing the time-of-flight instrument SV29 at the Juelich FRJ-2 reactor, spectra have been obtained from synthetic methane clathrate, tetrahydro-furane (THF) clathrate, 1,3,5-trimethyl-benzene (mesitylene) and light water ice at several temperatures between 2 K and 70 K. Clearly separated excitations at energy transfers of ±1 meV, +2 meV and +3 meV have been observed with synthetic methane clathrate. In mesitylene a wealth of low lying excitations have been observed. In the quenched phase we found lines at 4.7, 7.2, 9.6, 13.6, 15.4, 18.4, 19.0, 23.0, 29.5 and 34.3 meV, respectively. In the annealed phase, we observed significant shifts with the majority of lines. The lowest lying lines now are located at 7.0, 8.5 and 10.5 meV, respectively. In hexagonal ice at T=2 K up to now unreported low lying energy levels were found at energy transfers of 1.8 meV and 2.8 meV. An additional line at about 10 meV could be detected in THF clathrate. Mesitylene, synthetic methane clathrate and water ice, all at T=20 K, have been tested as moderators at the Juelich spallation mock-up JESSICA. The expected gain in neutron leakage current at energies around 2 meV as compared to conventional liquid hydrogen moderators has been observed for methane clathrate and mesitylene. (orig.)

  11. Program for Energy Research and Technologies 1977--1980. Annual report 1977 on efficient uses of energy fossil sources of primary energy new sources of energy

    1978-01-01

    The main objectives within the policy of the Federal Government Program for Energy Research and Technologies 1977--1980 can be summarized as follows: guaranteeing the continuity of energy supply in the medium to long term in the Federal Republic at economically favourable costs considering the requirements necessary for the protection of the environment and population. The financial support is effected under the general headings of Development of Energy Resources, Energy Conservation and Efficient Use of Energy. An additional aspect of the support policy is the development of technologies which are of importance for other countries, specifically for the developing countries. Support of a project is effected through a research and development grant from the Federal Government and this can range from less than 50% to 100%. For this the Government receives an irrevocable, free of charge and non-exclusive right to make use of research and development results. In special cases full repayment is agreed subject to commercial success. Based on agreements signed by the Federal Minister of Research and Technology and the Federal Minister of Economic Affairs on the one hand and the Juelich Nuclear Research Establishment (KFA) on the other, the Project Management for Energy Research (PLE) in KFA Juelich is acting on behalf of these Ministries. The Project Management's activities in non-nuclear energy research in general (for the Federal Ministry of Research and Technology) and development and innovation in coal mining and preparation (for the Federal Ministry of Economic Affairs) have the following general objectives: to improve the efficiency of Government support; to ensure that projects are efficiently handled; and to reduce the workload of the Ministries. The individual projects are listed and described briefly.

  12. A test system for electronics components of the PANDA MVD

    Lai, Alessandra; Stockmanns, Tobias; Ritman, James [Forschungszentrum Juelich (Germany); Collaboration: PANDA-Collaboration

    2016-07-01

    The PANDA experiment is one of the main devices at the upcoming Facility for Antiproton and Ion Research(FAIR), under construction in Darmstadt, Germany. This fixed target experiment will study the transition region between perturbative and non-perturbative QCD in the energy regime of the charmonium. The innermost sub-detector system of the target spectrometer of the PANDA experiment is the Micro Vertex Detector(MVD). Two types of silicon detectors will be used: pixel detectors and double-sided strip detectors. Two front-end chips are required: the Torino Pixel ASIC(ToPix) and the PANDA Strip ASIC(PASTA). Both are designed to transmit data at a rate of several hundred Megabits per second and are capable of handling the expected hit rate in hot spots of the detector. One key component in the development of new front-end electronics is a test system capable to handle these high rates. It should be flexible enough to test different kinds of front-end electronics and it should be easy to adapt to new prototypes. Therefore, an FPGA-based system is the ideal candidate. For this test system suitable firmware and a software framework are needed. Such a system is under development at the Forschungszentrum Juelich. The main component of the Juelich Digital Readout System(JDRS) is a Virtex 6 FPGA on a development board from Xilinx. In this talk, the mentioned read-out system are introduced, and lab tests with the front-end electronics of the MVD are presented.

  13. Progress and problems in modelling HTR core dynamics

    Scherer, W.; Gerwin, H.

    1991-01-01

    In recent years greater effort has been made to establish theoretical models for HTR core dynamics. At KFA Juelich the TINTE (TIme dependent Neutronics and TEmperatures) code system has been developed, which is able to model the primary circuit of an HTR plant using modern numerical techniques and taking into account the mutual interference of the relevant physical variables. The HTR core is treated in 2-D R-Z geometry for both nucleonics and thermo-fluid-dynamics. 2-energy-group diffusion theory is used in the nuclear part including 6 groups of delayed neutron precursors and 14 groups of decay heat producers. Local and non-local heat sources are incorporated, thus simulating gamma ray transport. The thermo-fluid-dynamics module accounts for heterogeneity effects due to the pebble bed structure. Pipes and other components of the primary loop are modelled in 1-D geometry. Forced convection may be treated as well as natural convection in case of blower breakdown accidents. Validation of TINTE has started using the results of a comprehensive experimental program that has been performed at the Arbeitsgemeinschaft Versuchsreaktor GmbH (AVR) high temperature pebble bed reactor at Juelich. In the frame of this program power transients were initiated by varying the helium blower rotational speed or by moving the control rods. In most cases a good accordance between experiment and calculation was found. Problems in modelling the special AVR reactor geometry in two dimensions are described and suggestions for overcoming the uncertainties of experimentally determined control rod reactivities are given. The influence of different polynomial expansions of xenon cross sections to long term transients is discussed together with effects of burnup during that time. Up to now the TINTE code has proven its general applicability to operational core transients of HTR. The effects of water ingress on reactivity, fuel element corrosion and cooling gas properties are now being

  14. Photochemical aging of secondary organic aerosols: effects on hygroscopic growth and CCN activation

    Buchholz, A.; Mentel, Th. F.; Tillmann, R.; Schlosser, E.; Mildenberger, K.; Clauss, T.; Henning, S.; Kiselev, A.; Stratmann, F.

    2009-04-01

    Plant emitted volatile organic carbons (VOCs) are a major precursor of secondary organic aerosols (SOA), an important constituent of atmospheric aerosols. The precursors are oxidized via ozonolysis, photooxidation, or by NO3 and form aerosol particles. Due to further oxidation of the organic matter the composition of the SOA may age with time. This will also change the hygroscopic growth (HG) and cloud condensation nuclei (CCN) activation of the particles. In this study we generated and aged SOA in the SAPHIR chamber at the Research Centre Juelich under near atmospheric conditions: natural sunlight, low precursor and O3 concentrations, and long reaction times. As precursor we used a mixture of 5 monoterpenes (MT) or 5 MT with 2 sesquiterpenes which had been identified as major constituents of plant emissions in previous experiments. Concentrations ranged between 4 and 100 ppb MT and the total reaction time was 36h. HG was measured at RH=10-97% by a Hygroscopic Tandem Differential Analyser (HTDMA, FZ Juelich) and at RH=97-99% by the Leipzig Aerosol Cloud Interaction Simulator (LACIS-mobile, IfT Leipzig). The agreement between HTDMA and LACIS-mobile data was generally good. CCN properties were measured with a continuous flow CCN Counter from DMT. SOA particles generated on a sunny day were more hygroscopic and had a lower activation diameter (Dcrit) than SOA formed under cloudy conditions. With aging it became more hygroscopic and Dcrit decreased. Sunlight enhanced this effect. But the change in HG and Dcrit due to aging was less than the difference between SOA generated under different conditions (i.e. sunny or cloudy). We did not observe a dependence of the HG on the precursor concentration.

  15. Decontamination of nuclear graphite by thermal processing; Dekontamination von Nukleargraphit durch thermische Behandlung

    Florjan, Monika W.

    2010-04-15

    The main problem in view of the direct disposal of the nuclear graphite is its large volume. This waste contains long-lived and short-lived radionuclides which determine the waste strategy. The irradiated graphite possess high amount of the {sup 14}C isotope. The main object of the present work was the selective separation of {sup 14}C isotope from the isotope {sup 12}C by thermal treatment (pyrolysis, partial oxidation). A successful separation could reduce the radiotoxicity and offer a different disposal strategy. Three different graphite types were investigated. The samples originate from the reflector and from the flaking of spherical fuel elements of the high-temperature reactor (AVR) Juelich. The samples from the thermal column of the research reactor (Merlin, Juelich) were also investigated. The maximum tritium releases were obtained both in inert gas atmosphere (N{sub 2}) and under water vapour-oxidizing conditions at 1280 C and 900 C. Furthermore it could be shown that 28% of {sup 14}C could be released under inert gas conditions at a 1280 C. By additive of oxidizing agent such as water vapour and oxygen the {sup 14}C release could be increased. Under water vapour-oxidizing conditions at a temperature of 1280 C up to 93% of the {sup 14}C was separated from the graphite. The matrix corrosion of 5.4% was obtained. The selective separation of the {sup 14}C is possible, because a substantial part of the radiocarbon is bound near the grain boundary surfaces. (orig.)

  16. Hot Laboratories and Remote Handling

    Bart, G.; Blanc, J.Y.; Duwe, R.

    2003-01-01

    divided in two parts: - First, a mutual share of real examples about the 'life' in hot laboratories: waste management, decommissioning and release, safety; - Second, a presentation of tools or facilities dealing with PIE or defueling. Special radwaste management was presented by: - ISPRA, for heavy water; - IFE Kjeller, for old stored steel waste; - FZ Juelich presented an example of decommissioning and re-opening of hot laboratories; - IFE Kjeller presented a synthesis of two questionnaires sent to European Hot Laboratories on 'the fire preparedness measures in buildings with hot laboratories'; - The creep test device settled in K6 LECI Hot Cells in CEA at the Saclay site was also described; - ITU Karlsruhe/FZ Juelich presented experimental details and results from a study on a Vicker hardness test; - CEA/Valrho presented the two newest facilities of Atalante; Session 3 - Prospective Research on Materials for Future Applications comprised four presentations concerning the development of future gas cooled reactors and the materials research for nuclear fusion plants, namely: - E.H. Toscano (European Commission, ITU-Karlsruhe,Germany) who described a new facility to measure the fission product inventory; - V. Basini (CEA Cadarache, France) who presented results of HTR fuel development and innovative elaboration processes of fuel particles; - M. Roedig (FZJ, Juelich, Germany) reported on post irradiation experiments on plasma facing materials and miniaturized components for the next step fusion device ITER; - J. P. Coad (EFDA-JET, Abingdon, U.K.) who gave an overview on the tritium related technology programs at JET

  17. Production and characterization of monodisperse uranium particles for nuclear safeguards applications

    Knott, Alexander

    2016-01-01

    Environmental sampling is a very effective measure to detect undeclared nuclear activities. Generally, samples are taken as swipe samples on cotton. These swipes contain minute quantities of particulates which have an inherent signature of their production and release scenario. These inspection samples are assessed for their morphology, elemental composition and their isotopic vectors. Mass spectrometry plays a crucial role in determining the isotopic ratios of uranium. Method validation and instrument calibration with well-characterized quality control (QC)-materials, reference materials (RMs) and certified reference materials (CRMs) ensures reliable data output. Currently, the availability of suitable well defined microparticles containing uranium and plutonium reference materials is very limited. Primarily, metals, oxides and various uranium and plutonium containing solutions are commercially available. Therefore, the IAEA's Safeguards Analytical Services (SGAS) cooperates with the Institute of Nuclear Waste Management and Reactor Safety (IEK-6) at the Forschungszentrum Juelich GmbH in a joint task entitled ''Production of Particle Reference Materials''. The work presented in this thesis has been partially funded by the IAEA, Forschungszentrum Juelich GmbH and the Federal Ministry of Economic Affairs and Energy (BMWi) through the ''Joint Program on the Technical Development and Further Improvement of IAEA Safeguards between the Government of the Federal Republic of Germany and the IAEA''. The first step towards monodisperse microparticles was the development of pure uranium oxide particles made from certified reference materials. The focus of the dissertation is (1) the implementation of a working setup to produce monodisperse uranium oxide particles and (2) the characterization of these particles towards the application as QC-material. Monodisperse uranium oxide particles were produced by spray pyrolysis. It was demonstrated that the particle size can be

  18. Performance Refactoring of Instrumentation, Measurement, and Analysis Technologies for Petascale Computing. The PRIMA Project

    Malony, Allen D. [Univ. of Oregon, Eugene, OR (United States). Dept. of Computer and Information Science; Wolf, Felix G. [Wilhelm-Johnen-Strasse, Julich (Germany). Forschungszentrum Julich GmbH

    2014-01-31

    The growing number of cores provided by today’s high-­end computing systems present substantial challenges to application developers in their pursuit of parallel efficiency. To find the most effective optimization strategy, application developers need insight into the runtime behavior of their code. The University of Oregon (UO) and the Juelich Supercomputing Centre of Forschungszentrum Juelich (FZJ) develop the performance analysis tools TAU and Scalasca, respectively, which allow high-­performance computing (HPC) users to collect and analyze relevant performance data – even at very large scales. TAU and Scalasca are considered among the most advanced parallel performance systems available, and are used extensively across HPC centers in the U.S., Germany, and around the world. The TAU and Scalasca groups share a heritage of parallel performance tool research and partnership throughout the past fifteen years. Indeed, the close interactions of the two groups resulted in a cross-­fertilization of tool ideas and technologies that pushed TAU and Scalasca to what they are today. It also produced two performance systems with an increasing degree of functional overlap. While each tool has its specific analysis focus, the tools were implementing measurement infrastructures that were substantially similar. Because each tool provides complementary performance analysis, sharing of measurement results is valuable to provide the user with more facets to understand performance behavior. However, each measurement system was producing performance data in different formats, requiring data interoperability tools to be created. A common measurement and instrumentation system was needed to more closely integrate TAU and Scalasca and to avoid the duplication of development and maintenance effort. The PRIMA (Performance Refactoring of Instrumentation, Measurement, and Analysis) project was proposed over three years ago as a joint international effort between UO and FZJ to

  19. Performance Refactoring of Instrumentation, Measurement, and Analysis Technologies for Petascale Computing: the PRIMA Project

    Malony, Allen D. [Department of Computer and Information Science, University of Oregon; Wolf, Felix G. [Juelich Supercomputing Centre, Forschungszentrum Juelich

    2014-01-31

    The growing number of cores provided by today’s high-end computing systems present substantial challenges to application developers in their pursuit of parallel efficiency. To find the most effective optimization strategy, application developers need insight into the runtime behavior of their code. The University of Oregon (UO) and the Juelich Supercomputing Centre of Forschungszentrum Juelich (FZJ) develop the performance analysis tools TAU and Scalasca, respectively, which allow high-performance computing (HPC) users to collect and analyze relevant performance data – even at very large scales. TAU and Scalasca are considered among the most advanced parallel performance systems available, and are used extensively across HPC centers in the U.S., Germany, and around the world. The TAU and Scalasca groups share a heritage of parallel performance tool research and partnership throughout the past fifteen years. Indeed, the close interactions of the two groups resulted in a cross-fertilization of tool ideas and technologies that pushed TAU and Scalasca to what they are today. It also produced two performance systems with an increasing degree of functional overlap. While each tool has its specific analysis focus, the tools were implementing measurement infrastructures that were substantially similar. Because each tool provides complementary performance analysis, sharing of measurement results is valuable to provide the user with more facets to understand performance behavior. However, each measurement system was producing performance data in different formats, requiring data interoperability tools to be created. A common measurement and instrumentation system was needed to more closely integrate TAU and Scalasca and to avoid the duplication of development and maintenance effort. The PRIMA (Performance Refactoring of Instrumentation, Measurement, and Analysis) project was proposed over three years ago as a joint international effort between UO and FZJ to accomplish

  20. Nuclear Legislation in OECD and NEA Countries. Regulatory and Institutional Framework for Nuclear Activities - Germany

    2011-01-01

    Committee - KTA); 3. Public and semi-public agencies (Technological Surveillance Association - Technische Ueberwachungsvereine-TUV; Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS)mbH; Karlsruhe Research Centre - Forschungszentrum Karlsruhe; Juelich Research Centre - Forschungszentrum Juelich GmbH; GKSS Research Centre Geesthacht - Forschungszentrum Geesthacht GmbH; Helmholtz Zentrum Berlin for Materials and Energy; The Electron-Synchrotron in Hamburg - Deutsches Elektronen-Synchrotron-DESY; Max-Planck Institute for Plasma Physics at Garching/Munich - Max-Planck-Institut fuer Plasmaphysik-IPP; Company for Heavy Ion Research - Gesellschaft fuer Schwerionenforschung mbH-GSI; Rossendorf Association for Nuclear Technology and Analysis - Verein fuer Kernverfahrenstechnik und Anlaytik)

  1. Transport of the reactive substances eosin, uranium and lithium in a heterogeneous aquifer; Transport der reaktiven Stoffe Eosin, Uranin und Lithium in einem heterogenen Grundwasserleiter

    Doering, U.

    1997-02-01

    To predict the movement of a contaminant plume in an aquifer is still a task of great uncertainty. This uncertainty is generally attributed to an insufficient understanding of the chemical reaction processes and/or to the natural aquifer heterogeneities. In an integrated approach of field experiments, laboratory experiments and numerical simulations, the transport of the weakly reactive solutes eosin, uranin and lithium was investigated at a test site near the Research Center in Juelich. The field scale transport behavior of the solutes was studied by large scale tracer tests. To characterize aquifer heterogeneities, in-situ and laboratory measurements were performed. In-situ measurements covered about 1500 flowmeter measurements and 90 determinations of the groundwater flow velocity by the borehole method. The spatial variability of hydraulic and physico-chemical parameters was further determined on 400 sediment samples. These parameters included: Grain size distribution, calculated hydraulic conductivity, unconformity and as physico-chemical parameters the organic carbon content, specific surface and the cation exchange capacity. Furthermore sorption coefficients were measured on 75 sediment samples for uranium and lithium. The statistical evaluation of these data showed that the hydraulic heterogeneity was larger but in the same order of magnitude as the physico-chemical parameters. (orig./SR) [Deutsch] Eine Schadstoff-Ausbreitung im Grundwasser vorherzusagen, ist noch immer eine Aufgabe mit unsicherem Ergebnis. Diese Prognose-Unsicherheiten werden im Allgemeinen auf ein unzureichendes Verstaendnis der chemischen Reaktionsprozesse und/oder auf die natuerliche Heterogenitaet des Grundwasserleiters zurueckgefuehrt. In dem hier beschriebenen Forschungsprojekt, das Feldversuche, Laborversuche und numerische Simulationen integriert, wurde der Transport der schwach reaktiven Substanzen Eosin, Uranin und Lithium auf einem Versuchsgelaende nahe des Forschungszentrums

  2. Community-oriented support and research structures

    Attig, Norbert; Eickermann, Thomas; Gibbon, Paul; Lippert, Thomas, E-mail: th.lippert@fz-juelich.d [Institute for Advanced Simulation, Juelich Supercomputing Centre, Forschungszentrum Juelich, 52425 Juelich (Germany)

    2009-07-01

    Coordinated by the Partnership for Advanced Computing in Europe (PRACE) Europe is restructuring and strengthening its high-performance computing infrastructure with the aim to create a model HPC ecosystem. At the tip of the pyramid, up to six centres are envisaged that will operate systems of the highest performance class. The HPC Research Infrastructure (HPC-RI) will comprise European, national and regional centres. Science communities are integral partners, strong links will include Grid and Cloud users. The HPC-RI strives at providing scientists all over Europe, on the one hand, with unlimited and independent access to state-of-the-art computer resources in all performance classes and, on the other hand, with a world-class pan-European competence and support network. While the hardware-oriented buildup of the infrastructure is making progress, high-quality user support and software development in the upcoming era of unprecedented parallelism and exascale on the horizon have become the imminent challenges. This has been clearly recognized by the European Commission, who will issue calls for proposals to fund petascale software development in summer 2009. Although traditional support structures are well established in Europe's major supercomputing centres, it is questionable if these structures are able to meet the challenges of the future: in general, support structures are based on cross-disciplinary computer science and mathematics teams; disciplinary computational science support usually is given in an ad-hoc, project-oriented manner. In this paper, we describe our approach to establish a suitable support structure-Simulation Laboratories (SL). SLs are currently being established at the Juelich Supercomputing Centre of the Forschungszentrum Juelich (FZJ) and at the Steinbuch Centre for Computing (SCC) of the Karlsruhe Institute for Technology (KIT) in Germany. While SLs are community-oriented, i.e. each SL focusses on a specific community, they are

  3. Variation of the 18O/16O ratio in water samples from branches

    Foerstel, H.; Huetzen, H.

    1979-06-01

    The studies of the water turnover of plants may use the labelling of water by its natural variation of the 18 O/ 16 O ratio. The basic value of such a study is the isotope ratio in soil water, which is represented by the 18 O/ 16 O ratio in water samples from stem and branches, too. During the water transport from the soil water reservoir to the leaves of trees, no fractionation of the oxygen isotopes occurs. The oxygen isotope ratio within a single twig varies about +- 0 / 00 (variation given as standard deviation of the delta-values), within the stem of a large tree about +- 2 0 / 00 . The results of water from stems of different trees at the site of the Nuclear Research Center Juelich scatter about +- 1 0 / 00 . The delta-values from a larger area (Rur valley-Eifel hills-Mosel valley), which were collected in October 1978 during the end of the vegetation period, showed a standard deviation between +- 2.2 (Rur valley) and +- 3.6 0 / 00 (Eifel hills). The 18 O/ 16 O-delta-values of a beech wood from Juelich site are in the range of - 7.3 and - 10.1 0 / 00 (mean local precipitation 1974 - 1977: - 7.4 0 / 00 ). At the hill site near Cologne (Bergisches Land, late September 1978) we observed an oxygen isotope ratio of - 9.1 0 / 00 (groundwater at the neighbourhood between - 7.6 and 8.7 0 / 00 ). In October 1978 at an area from the Netherlands to the Mosel valley we found delta-values of branch water between - 13.9 (lower Ruhr valley) and - 13.1 (Eifel hills to Mosel valley) in comparison to groundwater samples from the same region: - 7.55 and - 8.39. There was no significant difference between delta-values from various species or locations within this area. Groundwater samples should normally represent the 18 O/ 16 O ratio of local precipitation. The low delta-values of branch water could be due to the rapid uptake of precipitation water of low 18 O content in autumn to the water transport system of plants. (orig.) [de

  4. Investigation of hydrogen recombination under natural convection conditions; Untersuchungen zur Wasserstoffrekombination unter Naturkonvektionsbedingungen

    Simon, Berno

    2015-09-04

    Passive Autocatalytic Recombiners (PAR) are installed inside the containment of nuclear power plants in order to prevent the build-up of flammable mixtures and to mitigate the effects of hydrogen deflagrations, which can occur in the event of a severe accident combined with the release of hydrogen. In order to simulate the operating behaviour of PARs, the computer program REKO-DIREKT is being developed at the Forschungszentrum Juelich in collaboration with the Institute for Reactor Safety and Reactor Technology at the RWTH Aachen. For the validation of the code, data from experimental facilities operated at Juelich are used. This work focusses on the analysis of the chimney effect through the PAR housing as well as the optimization of the chimney model of REKO-DIREKT. Therefore experimental investigations are carried out in the REKO-4 facility under natural convection conditions. This facility is equipped with numerous measuring devices, e.g. katharometers for in-situ measuring of the hydrogen concentration and the optical flow measurement technique Particle-Image-Velocimetry. In preliminary assessments the equipment is being qualified in order to determine the measurement accuracy. In the following experimental investigations, a small-scale PAR is used, that is built in a modular way allowing it to be equipped with different chimney geometries. The experimental results produce a database that shows the central correlation between the hydrogen concentration, the catalyst temperature and the inlet velocity. The results include the variation of the recombiner's chimney height and experiments at different operating pressures. After optimization of the chimney model, the simulation program is validated against experiments in the large-scale facility THAI in Eschborn, which have been performed subsequent to this thesis in the context of the OECD/NEA-THAI project. Finally, the influence of a downward-directed, near-wall flow on the operational behaviour of the small

  5. Community-oriented support and research structures

    Attig, Norbert; Eickermann, Thomas; Gibbon, Paul; Lippert, Thomas

    2009-01-01

    Coordinated by the Partnership for Advanced Computing in Europe (PRACE) Europe is restructuring and strengthening its high-performance computing infrastructure with the aim to create a model HPC ecosystem. At the tip of the pyramid, up to six centres are envisaged that will operate systems of the highest performance class. The HPC Research Infrastructure (HPC-RI) will comprise European, national and regional centres. Science communities are integral partners, strong links will include Grid and Cloud users. The HPC-RI strives at providing scientists all over Europe, on the one hand, with unlimited and independent access to state-of-the-art computer resources in all performance classes and, on the other hand, with a world-class pan-European competence and support network. While the hardware-oriented buildup of the infrastructure is making progress, high-quality user support and software development in the upcoming era of unprecedented parallelism and exascale on the horizon have become the imminent challenges. This has been clearly recognized by the European Commission, who will issue calls for proposals to fund petascale software development in summer 2009. Although traditional support structures are well established in Europe's major supercomputing centres, it is questionable if these structures are able to meet the challenges of the future: in general, support structures are based on cross-disciplinary computer science and mathematics teams; disciplinary computational science support usually is given in an ad-hoc, project-oriented manner. In this paper, we describe our approach to establish a suitable support structure-Simulation Laboratories (SL). SLs are currently being established at the Juelich Supercomputing Centre of the Forschungszentrum Juelich (FZJ) and at the Steinbuch Centre for Computing (SCC) of the Karlsruhe Institute for Technology (KIT) in Germany. While SLs are community-oriented, i.e. each SL focusses on a specific community, they are structured

  6. Case Studies of integrated hydrogen systems. International Energy Agency Hydrogen Implementing Agreement, Final report for Subtask A of task 11 - Integrated Systems

    Schucan, T. [Paul Scherrer Inst., Villigen PSI (Switzerland)

    1999-12-31

    Within the framework of the International Energy Agency Hydrogen Implementing Agreement, Task 11 was undertaken to develop tools to assist in the design and evaluation of existing and potential hydrogen demonstration projects. Emphasis was placed on integrated systems, from input energy to hydrogen end use. Included in the PDF document are the Executive Summary of the final report and the various case studies. The activities of task 11 were focused on near- and mid-term applications, with consideration for the transition from fossil-based systems to sustainable hydrogen energy systems. The participating countries were Canada, Italy, Japan, the Netherlands, Spain, Switzerland and the United States. In order for hydrogen to become a competitive energy carrier, experience and operating data need to be generated and collected through demonstration projects. A framework of scientific principles, technical expertise, and analytical evaluation and assessment needed to be developed to aid in the design and optimization of hydrogen demonstration projects to promote implementation. The task participants undertook research within the framework of three highly coordinated subtasks that focused on the collection and critical evaluation of data from existing demonstration projects around the world, the development and testing of computer models of hydrogen components and integrated systems, and the evaluation and comparison of hydrogen systems. While the Executive Summary reflects work on all three subtasks, this collection of chapters refers only to the work performed under Subtask A. Ten projects were analyzed and evaluated in detail as part of Subtask A, Case Studies. The projects and the project partners were: Solar Hydrogen Demonstration Project, Solar-Wasserstoff-Bayern, Bayernwerk, BMW, Linde, Siemens (Germany); Solar Hydrogen Plant on Residential House, M. Friedli (Switzerland); A.T. Stuart Renewable Energy Test Site; Stuart Energy Systems (Canada); PHOEBUS Juelich

  7. Workshop on mesons and mesonic states up to slightly above 1 GeV/c2

    Oelert, W.; Sefzick, T.

    1991-04-01

    The new accelerator COSY-Juelich will provide protons with momenta up to 3.3 GeV/c. Thus an effective mass slightly above 1 GeV/c 2 can be produced in the pp-interaction. Employing higher mass targets also heavier mesons can be observed. The production of single mesons and of mesonic states with and without strangeness can be investgated at COSY. The structure of some mesons in the mass range of 950 McV/c 2 to 1020 MeV/c 2 is still not well understood. While the Φ(1020) at the upper limit of this range is believed to be of rahter pure santi s nature the content of the η'(958) meson at the lower limit of this range is still under discussion. New results suggest that what is called the f o meson (former notation S*) consists in reality of two close and narrow states; one of them being a santi s - quarks configuration while the other should be a flavour singlet which couples to ππ and Kanti K with similar strengths. Also the discussion on possible gluonium candidates is still alive. It is speculated that some of these mesons - till now supposed to have widths of 30 to 50 MeV/c 2 - could rather be an overlay of structures with much smaller widths. Another features of resonances in this region is their partial decay into the Kanti K channel if their actual mass is large enough. Strong decays in Kanti K could be a signal of a Kanti K 'molecular' nature of the resonance. In particular the atomic K + K - structure should exist. In order to have review of the physics related to these problems there was a workshop held on: MESONS and MESONIC STATES up to slightly above 1 GeV/c 2 at the ZEL - Forschungszentrum - Juelich February 19 to 20, 1990. The following contains copies of the shown transparencies and short write-ups as far as available. (orig.)

  8. Characterization of the source distribution of particulate matter and nitrogen oxides in rural and urban areas; Charakterisierung der Quellverteilung von Feinstaub und Stickoxiden in laendlichem und staedtischem Gebiet

    Urban, Susanna

    2010-07-01

    By the entry of anthropogenic emissions, the air quality is especially impacted in urban center. Thus, EU-wide limits of gas phase components, e.g. NO{sub 2} und O{sub 3}, and particulate matter concentration (PM10) exist to protect human health. Particularly, high particulate matter concentrations are more and more of interest because of their adverse health effect on the human respiratory system. Therefore a network of stationary measurements in different loaded and inhabited regions monitors the air quality in Germany. In contrast to these selective stationary facilities, this thesis presents mobile measurements to determine concentration fields of gases and particles. Therefore, a ''driving air-lab'' with a large set of temporally high resolved instruments to measure gas and particulate phase as well as geographical and meteorological parameters has been built up. The particulate measurement technique includes PM10- and PM2.5-collections and real-time ELPI measurements of time resolved particle size concentrations. Additionally, the installation of gas phase detection technique for NO{sub 2}, NO, O{sub 3}, CO as well as for volatile organic hydrocarbons completes the ''driving air-lab''. During the three measurement campaigns lasting several weeks the temporal and spatial distribution of particulate and gas phase concentrations in rural, suburban and urban area in the region of the Bodensee, in the city region of Duesseldorf and close to the highway in the area of Juelich could be determined and classified. During the measurement campaign ZEPTER-2 the ''driving air-lab'' formed the groundbase to the concurrent vertical profile measurements of the zeppelin. The comparison of the measuring systems of all parameters during the intermediate landing of the zeppelin showed a very good agreement. The use of adequate percentile filters allowed the separation of the local traffic peaks from the total background. It could be demonstrated that the total background is

  9. Fission product behaviour in the primary circuit of an HTR

    Decken, C.B. von der; Iniotakis, N.

    1981-01-01

    The knowledge of fission product behaviour in the primary circuit of a High Temperature Reactor (HTR) is an essential requirement for the estimations of the availability of the reactor plant in normal operation, of the hazards to personnel during inspection and repair and of the potential danger to the environment from severe accidents. On the basis of the theoretical and experimental results obtained at the ''Institute for Reactor Components'' of the KFA Juelich /1/,/2/ the transport- and deposition behaviour of the fission- and activation products in the primary circuit of the PNP-500 reference plant has been investigated thoroughly. Special work had been done to quantify the uncertainties of the investigations and to calculate or estimate the dose rate level at different components of the primary cooling circuit. The contamination and the dose rate level in the inspection gap in the reactor pressure vessel is discussed in detail. For these investigations in particular the surface structure and the composition of the material, the chemical state of the fission products in the cooling gas, the composition of the cooling gas and the influence of dust on the transport- and deposition behaviour of the fission products have been taken into account. The investigations have been limited to the nuclides Ag-110m; Cs-134 and Cs-137

  10. Three-nucleon system dynamics studied via deuteron-proton breakup

    Kistryn, S.

    2011-01-01

    Nucleon-nucleon (NN) interaction is a basis for vast fields of fundamental nuclear physics and its application, therefore a detailed knowledge of the dynamics of few-nucleon systems has been a subject of intensive quest over several decades. Modern NN potential models can be probed quantitatively in the three-nucleon environment by comparing predictions based on rigorous solutions of the Faddeev equations with the measured observables. Proper description of the experimental data can be achieved only if the dynamical models include subtle effects of suppressed degrees of freedom, effectively introduced by means of genuine three-nucleon forces. A large set of high precision, exclusive cross-section data for the "1H(d,pp)n breakup reaction at 130 MeV, acquired in a first new-generation experiment at KVI Groningen, contributes significantly to constrain the physical assumptions underlying the theoretical interaction models. Comparison of nearly 1800 cross-section data points with the predictions using nuclear interactions generated in various ways, allowed to establish for the first time a clear evidence of importance of the three-nucleon forces in the breakup process. Moreover, the results, supplemented by a set of cross-sections from another dedicated experiment at FZ Juelich, confirmed predictions of sizable Coulomb force influences in this reaction. Following further, comparably rich and precise data sets, encompassing also polarization observables, will form a database to validate the theoretical models of few-nucleon system dynamics. (author)

  11. The Klinger hot gas double axial valve

    Kruschik, J.; Hiltgen, H.

    1984-01-01

    The Klinger hot gas valve is a medium controlled double axial valve with advanced design features and safety function. It was first proposed by Klinger early in 1976 for the PNP-Project as a containment shut-off for hot helium (918 deg. C and 42 bar), because a market research has shown that such a valve is not state of present techniques. In the first stage of development a feasibility study had to be made by detailed design, calculation and by basic experiments for key components in close collaboration with Interatom/GHT. This was the basis for further design, calculation, construction and experimental work for such a valve prototype within the new development contract. The stage of knowledge to that time revealed the following key priority development areas: Finite element stress analysis for the highly stressed high temperature main components; development of an insulation layout; Detailed experimental tests of functionally important structural components or units of the valve, partly at Klingers (gasstatic bearings, flexible metallic sealing element, aerodynamic and thermohydraulic tests), partly at Interatom (actuator unit and also gasstatic bearings), partly at HRB in Juelich (flexible metallic sealing system, aerodynamic and thermohydraulic tests); Design of a test valve for experimental work in the KVK (test circuit at Interatom) for evaluation of temperature distribution and reliability of operation; Design of a prototype and extensive testing in the KVK

  12. Elcodrum I, a tamper-resistant and integrity controlled container for SNM

    Bueker, H.; Arning, F.; Reuters, H.; Nicolai, S.

    1984-01-01

    The safekeeping of special nuclear material (SNM) requires the use of a container with opening and surface area protection, which means that any access to the nuclear material whether by opening or damaging the container shell must be recorded. Based on the optoelectronic sensor principle, a 55-gallon drum with opening and surface area protection has been developed for which the opening status as well as the integrity of its entire surface can be verified at any time in a tamperproof manner. This may be done either ''in situ'' or from a remote monitoring station by means of a computer-aided remote verification system. The prototype of such a container has been successfully tested for more than five months at the Juelich Nuclear Research Center. It can be used both for national and international nuclear materials safeguards. It also offers itself for application in the planned ''International Plutonium Storage (IPS)'' system. The design and functioning of the container as well as the use of several containers in conjunction with a computer-aided remote verification system will be described

  13. The quasi-free reaction p+d → d+η+p{sub sp} at ANKE

    Schroeer, Daniel; Fritzsch, Christopher; Khoukaz, Alfons; Rump, Marcel [Institut fuer Kernphysik, Westfaelische Wilhelms-Universitaet, Muenster (Germany); Collaboration: ANKE-Collaboration

    2016-07-01

    The interaction between η mesons and hadrons is an intensively investigated topic. Due to its stength it might lead to the formation of η-mesic nuclei. In order to study the characteristics of this interaction a measurement of the reaction p+d → d+η+p{sub sp} has been performed at the ANKE spectrometer at the COSY accelerator of the Forschungszentrum Juelich. In this context the deuteron serves as an effective neutron target whereas the proton is treated as a spectator particle. The two different beam momenta (p{sub 1} = 2.09 GeV/c and p{sub 2} = 2.25 GeV/c) in combination with the Fermi motion inside the target deuteron grant access to the determination of total and differential cross sections in an excess energy range from threshold up to Q = 90 MeV. While the course of the total cross section, especially near threshold, will allow to compute the scattering length a{sub dη} of an s-wave final state interaction ansatz, the differential cross sections permit to verify the legitimacy of the s-wave assumption. Furthermore the data taken at higher excess energies enable to examine the role of nucleonic resonances in the production process of η mesons. Recent results are presented and discussed.

  14. Organizational aspects of the handling of radiation accidents in the Federal Republic of Germany

    Fliedner, T.M.

    1977-01-01

    In the Federal Republic of Germany it is a legal requirement that persons exposed to ionizing radiation as a consequence of their employment in radiation facilities should be monitored. Some 90000 persons constitute the population 'at risk' for occupational radiation exposure. The actual radiation accident rate has been very low indeed. Nevertheless, precautions must be taken. Four radiation accident categories may be distinguished: uncomplicated, complicated, contamination and incorporation accidents. In the Federal Republic, the 'Berufsgenossenschaften' (BGS) are required to organize radiation accident care if necessary and take all measures to prevent them. The BGS has issued a pamphlet 'First Aid in case of Increased Exposure to Ionizing Radiation' as a guide to all personnel concerned. The BGS has also organized 5 'Regional Radiation Protection Centres' available to give advice 7 days a week, 24 hours a day in Hamburg, Homburg (Saar), Juelich, Karlsruhe und Munich. These centres are all equipped to provide first aid and decontamination and to cater for a short term stay until a decision is reached as to how to handle a particular accident. The special burns hospital of the BGS in Ludwigshafen is equipped with sterile rooms to handle 'complicated accidents', in particular when skin burns are involved. Two mobile 'radiation protection units' are available in Karlsruhe and Munich to provide help in all problems of dosimetry and health physics. A medical advisory team has been formed to supplement local physicians in dealing with special problems in the handling of radiation accident victims. (author)

  15. LEU-plate irradiation at FRJ-2 (DIDO) under the German AF-programme

    Groos, E; Krug, W; Seferiadis, J; Thamm, G

    1985-07-01

    10 LEU fuel plates (8 with uranium silicides max. U-density 6.1 g/cm{sup 3}) have been irradiated at FRJ-2 (DIDO) of KFA-Juelich till end of October 1984 during 321 full power days up to max. burnup of 2.41x10{sup 27} fissions/m{sup 3} without major interruptions and troubles. PIE began recently in KFA hot cells. Visual inspections revealed no damage or greater deformation for the majority of the plates, but red/brown coloured layers (partially peeled off) on the cladding over the fuel. Aluminium (oxide) is the chief constituent of the layer with smaller portions of Ni and Fe the latter causing the red/brown colour. The major part of the layer ({approx}50 {mu}m) most probably has been formed during 20 h immediately after experiment start-up under abnormal conditions of the coolant water. Gamma scanning has been completed. Dimensional measurements are under way confirming first observations of severe swelling (pillowing) of 1 plate. Density and blister testing as well as metallography and burnup analysis remain to be accomplished end of 1985/beginning of 1986. (author)

  16. Computer codes for the operational control of the research reactors

    Kalker, K.J.; Nabbi, R.; Bormann, H.J.

    1986-01-01

    Four small computer codes developed by ZFR are presented, which have been used for several years during operation of the research reactors FRJ-1, FRJ-2, AVR (all in Juelich) and DR-2 (Riso, Denmark). Because of interest coming from the other reactor stations the codes are documented within the frame work of the IAEA Research Contract No. 3634/FG. The zero-dimensional burnup program CREMAT is used for reactor cores in which flux measurements at each individual fuel element are carried out during operation. The program yields burnup data for each fuel element and for the whole core. On the basis of these data, fuel reloading is prepared for the next operational period under consideration of the permitted minimum shut down reactivity of the system. The program BURNY calculates burnup for fuel elements inaccessible for flux measurements, but for which 'position weighting factors' have been measured/calculated during zero power operation of the core, and which are assumed to be constant in all operational situations. The code CURIAX calculates post-irradiation data for discharged fuel elements needed in their manipulation and transport. These three programs have been written for highly enriched fuel and take into account U-235 only. The modification of CREMAT for LEU Cores and its combiantion with ORIGEN is in preparation. KINIK is an inverse kinetic code and widely used for absorber rod calibration at the abovementioned research reactors. It includes a special polynomial subroutine which can easily be used in other codes. (orig.) [de

  17. Comparative assessment of condensation models for horizontal tubes

    Schaffrath, A.; Kruessenberg, A.K.; Lischke, W.; Gocht, U.; Fjodorow, A.

    1999-01-01

    The condensation in horizontal tubes plays an important role e.g. for the determination of the operation mode of horizontal steam generators of VVER reactors or passive safety systems for the next generation of nuclear power plants. Two different approaches (HOTKON and KONWAR) for modeling this process have been undertaken by Forschungszentrum Juelich (FZJ) and University for Applied Sciences Zittau/Goerlitz (HTWS) and implemented into the 1D-thermohydraulic code ATHLET, which is developed by the Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) mbH for the analysis of anticipated and abnormal transients in light water reactors. Although the improvements of the condensation models are developed for different applications (VVER steam generators - emergency condenser of the SWR1000) with strongly different operation conditions (e.g. the temperature difference over the tube wall in HORUS is up to 30 K and in NOKO up to 250 K, the heat flux density in HORUS is up to 40 kW/m 2 and in NOKO up to 1 GW/m 2 ) both models are now compared and assessed by Forschungszentrum Rossendorf FZR e.V. Therefore, post test calculations of selected HORUS experiments were performed with ATHLET/KONWAR and compared to existing ATHLET and ATHLET/HOTKON calculations of HTWS. It can be seen that the calculations with the extension KONWAR as well as HOTKON improve significantly the agreement between computational and experimental data. (orig.) [de

  18. Experimental determination of proton induced reaction cross sections on {sup nat}Ni near threshold energy

    Uddin, Md. Shuza [Atomic Energy Research Establishment, Dhaka (Bangladesh). Tandem Accelerator Facilities; Forschungszentrum Juelich GmbH (Germany). Inst. fuer Neurowissenschaften und Medizin, INM-5: Nuklearchemie; Chakraborty, Animesh Kumer [Atomic Energy Research Establishment, Dhaka (Bangladesh). Tandem Accelerator Facilities; Chittagong University of Engineering and Technology (Bangladesh). Dept. of Physics; Spellerberg, Stefan; Spahn, Ingo; Qaim, Syed M. [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Neurowissenschaften und Medizin, INM-5: Nuklearchemie; Shariff, Md. Asad; Das, Sopan [Atomic Energy Research Establishment, Dhaka (Bangladesh). Tandem Accelerator Facilities; Rashid, Md. Abdur [Chittagong University of Engineering and Technology (Bangladesh). Dept. of Physics

    2016-08-01

    A newly developed facility at the 3 MV Tandem Accelerator at Dhaka for measurement of proton induced reaction cross sections in the energy region below 5 MeV is outlined and tests for the beam characterization are described. The results were validated by comparison with the well-known excitation function of the {sup 64}Ni(p, n){sup 64}Cu reaction. Excitation functions of the reactions {sup nat}Ni(p, x){sup 60,61}Cu, {sup nat}Ni(p, x){sup 55,57,58m+g}Co and {sup nat}Ni(p, x){sup 57}Ni were also measured from threshold to 16 MeV using the stacked-foil technique, whereby irradiations were performed with 5 MeV protons available at the Tandem Accelerator and 16.7 MeV protons at the BC 1710 cyclotron at Juelich, Germany. The radioactivity was measured using HPGe γ-ray detectors. A few results are new, the others strengthen the database. In particular, the results of the reaction {sup nat}Ni(p, x){sup 61}Cu below 3 MeV could serve as beam monitor.

  19. Energy models for the FRG

    Voss, A.

    1976-01-01

    The development and application of energy models as helping factors in planning and decision making has gained more importance in all regions of energy economy and energy policy in recent times. This development not only covered models for the single branches and companies like, for example, for improving power plant systems, but also models showing the whole energy system. These models aim at analizing the possibilities of developing the energy supply with regard to aspects of the entire system, paying special attention to the integration of the energy system into economic and ecological side conditions. The following essay briefly explains the energy models developed for the Federal Republic of Germany after analizing the set of problems of energy and the demands on the energy planning methods arising from them. The energy model system developed by the programming team 'Systems research and technological development' of the nuclear research plant in Juelich is dealt with very intensively, explaining some model results as examples. Finally, the author gives his opinion on the problem of the integration and conversion of model studies in the process of decision making. (orig.) [de

  20. Demolition of the FRJ-1 research reactor (MERLIN)

    Stahn, B.; Matela, K.; Zehbe, C.; Poeppinghaus, J.; Cremer, J.

    2003-01-01

    FRJ-2 (MERLIN), the swimming pool reactor cooled and moderated by light water, was built at the then Juelich Nuclear Research Establishment (KFA) between 1958 and 1962. In the period between 1964 and 1985, it was used for. The reactor was decommissioned in 1985. Since 1996, most of the demolition work has been carried out under the leadership of a project team. The complete secondary cooling system was removed by late 1998. After the cooling loops and experimental installations had been taken out, the reactor vessel internals were removed in 2000 after the water had been drained from the reactor vessel. After the competent authority had granted a license, demolition of the reactor block, the central part of the research reactor, was begun in October 2001. In a first step, the reactor operating floor and the reactor attachment structures were removed by the GNS/SNT consortium charged with overall planning and execution of the job. This phase gave rise to approx. The reactor block proper is dismantled in a number of steps. A variety of proven cutting techniques are used for this purpose. Demolition of the reactor block is to be completed in the first half of 2003. (orig.) [de

  1. Prestressed cast iron pressure vessels as burst-proof pressure vessels for innovative nuclear applications

    Froehling, W.; Boettcher, A.; Bounin, D.; Steinwarz, W.; Geiss, M.; Trauth, M.

    2000-01-01

    The amendment to the German Atomic Energy Act from July 28, 1994 requires that events 'whose occurrence is practically excluded by the measures against damages', i.e. events of the category residual risk, must not necessitate far reaching protective measures outside the plant. For a conventional reactor pressure vessel, the residual risk consists in the very small probability of a catastrophic failure (formation of a large fracture opening, bursting of the vessel). With a prestressed cast iron vessel (PCIV), the formation of a large fracture opening or bursting of the vessel, respectively, is impossible due to its design properties. Against this background the possibility of the use of this type of pressure vessel for lightwater reactors has been studied in the frame of a 'Working Group for Innovative Nuclear Technology', founded by different research institutes and industrial companies. Furthermore, it has been studied whether the use of the PCIV support the realization of a corecatcher system. The results are presented in this report. Already many years earlier, Siempelkamp has performed industrial development and Forschungszentrum Juelich related experimental and theoretical safety research for the PCIV as an innovative, bust-proof pressure vessel concept. This development of the PCIV as well as its safety properties are also presented in a conclusive manner. (orig.) [de

  2. Observation of magnetic field perturbations during sawtooth activity in tokamak plasmas

    Soltwisch, H.; Koslowski, H.R.

    1997-01-01

    Sawtooth activity is a prominent example of a global plasma instability which is observed in virtually all tokamak devices. Despite numerous experimental and theoretical investigations, the phenomenon is still barely understood. As far as experimental effort is concerned, much attention has been paid to soft X-ray emission from the plasma and to its analysis in terms of two-dimensional contour plots, because it is thought to reflect the shape and temporal behaviour of magnetic flux surfaces during a sawtooth cycle. Recently, more direct methods of detecting sawtooth-related changes in the magnetic field structure have become available and have added new facets to the general picture. In this picture, some observations made on the Juelich tokamak TEXTOR by means of a Faraday rotation diagnostic technique will be reported. First, in correlation with the sawtooth collapse a localized periodic perturbation of the magnetic field with principal mode numbers m = 1 and n = 0 has been detected which, in the presence of an m = n = 1 island, may give rise to magnetic field line stochastization and thereby contribute significantly to a rapid expulsion of electronic energy from the plasma core region. Second, the so-called precursor oscillations prior to a sawtooth crash have been investigated and estimates have been obtained for the growth rate and width of a magnetic island forming immediately before the collapse. (Author)

  3. TBCs for Gas Turbines under Thermomechanical Loadings: Failure Behaviour and Life Prediction

    Herzog R.

    2012-10-01

    Full Text Available The present contribution gives an overview about recent research on a thermal barrier coating (TBC system consisted of (i an intermetallic MCrAlY-alloy Bondcoat (BC applied by vacuum plasma spraying (VPS and (ii an Yttria Stabilised Zirconia (YSZ top coat air plasma sprayed (APS at Forschungszentrum Juelich, Institute of Energy and Climate Research (IEK-1. The influence of high temperature dwell time, maximum and minimum temperature on crack growth kinetics during thermal cycling of such plasma sprayed TBCs is investigated using infrared pulse thermography (IT, acoustic emission (AE analysis and scanning electron microscopy. Thermocyclic life in terms of accumulated time at maximum temperature decreases with increasing high temperature dwell time and increases with increasing minimum temperature. AE analysis proves that crack growth mainly occurs during cooling at temperatures below the ductile-to-brittle transition temperature of the BC. Superimposed mechanical load cycles accelerate delamination crack growth and, in case of sufficiently high mechanical loadings, result in premature fatigue failure of the substrate. A life prediction model based on TGO growth kinetics and a fracture mechanics approach has been developed which accounts for the influence of maximum and minimum temperature as well as of high temperature dwell time with good accuracy in an extremely wide parameter range.

  4. The long term plan for the integration of nuclear power plants into the Turkish Electrical Power System

    Kutukcuoglu, A.

    1974-03-01

    The report covers in detail the study of the expansion of the Turkish Electric Power System for the period 1980-1987. Load forecast is done by sectors and regions and inter-regions power balances gave the basis for the high voltage network configurations. Expansion alternatives are defined giving priority to hydroelectric projects, to local resources and nuclear power plants concurrently with conventional plants (lignite and oil). Several reactor strategies are analysed with LWR, HWR, FBR and HTGR power plants. Present worth value method is used for comparison of alternatives and sensitivity analysis is done for those ranked in the first places. Load flow, transient stability and frequency deviation studies of the power system are studied carefully by means of A.C. calculator and digital computer codes in order to see the influence of the introduction of large-sized power plants (600-750MW(e)) and their location in the power system. A 600MW(e) nuclear plant in 1983 and a second one of 750MW(e) in 1987 should, it is found, be commissioned into the system. The economic optimization was done with two computer programmes developed by KFA (Juelich): IACO for fuelling nuclear plant and RESTRAPO for power system with high hydroelectric component. The report is bound in three volumes: Volume I: Summary and Conclusions; Volume II: System Planning; Volume III: Electrical Survey

  5. The problem of radioactive contamination inhomogeneity and simulation of the transport of radionuclides through agroecosystems

    Girij, V.A.; Shpinar, L.I.; Yaskovets, I.I.; Zaitov, V.R.; Hille, R.

    1997-01-01

    The analyses of the measurement data on the territory of the Ukrainian Polesie region carried out by the Research Centre Juelich and the Ukrainian Institute of Radioecology shows that there is a high degree of inhomogeneity for the contamination pattern, they transfer from soil to the biosphere and for the food consumption. Therefore, a deterministic environmental assessment model may not be convenient because most processes are not known in detailed. In this situation a probabilistic approach seems to be more promising. In this report presented a dynamic model for the transfer of radioactivity in terrestrial food chains that fit to the regionally conditions and agricultural practice. The living organism will be treated as dynamic system subject to random action of radioactivity. This system is described by stochastic differential equations of Langevene's type. Starting from this base we calculated a distribution function of radionuclide body burdens for inhabitant ensembles under the assumptions that entering of activity into organisms is a random temporary function that can be approximated by certain impulse Poison processes. A comparison of calculated distribution function is carried out with measurement results of internal body burden. It shown a satisfactory description of the real situation found for four investigated villages of Ukrainian Polesie region (Olevsk, Narodichi, Vezhitsa and Stare Selo) that were characterized by different degree of contamination and different degree of inhomogeneity

  6. Recent developments in X-ray and neutron small-angle scattering instrumentation and data analysis

    Schelten, J.

    1978-01-01

    The developments in instrumentation and data analysis that have occurred in the field of small-angle X-ray and neutron scattering since 1973 are reviewed. For X-rays, the cone camera collimation was invented, synchrotrons and storage rings were demonstrated to be intense sources of X-radiation, and one- and two-dimensional position-sensitive detectors were interfaced to cameras with both point and line collimation. For neutrons, the collimators and detectors on the Juelich and Grenoble machines were improved, new D11-type instruments were built or are under construction at several sites, double-crystal instruments were set up, and various new machines have been proposed. Significant progress in data analysis and evaluation has been made through application of mathematical techniques such as the use of spline functions, error minimization with constraints, and linear programming. Several special experiments, unusual in respect to the anisotropy of the scattering pattern, gravitational effects, moving scatterers, and dynamic fast time slicing, are discussed. (Auth.)

  7. Interdisciplinary study of the influence on effectiveness of catalytic hydrogen recombiners of operating conditions in the reactor containment

    Kelm, S.; Reinecke, E.A.; Schoppe, L.; Dornseiffer, J.; Leistner, F.; Juehe, S.

    2008-01-01

    At the Emsland nuclear power station, a total of 58 autocatalytic hydrogen recombiners were backfitted in 1999 as an additional measure of risk reduction in connection with major hydrogen releases after events going beyond the design basis. Annual in-service inspections after 2002 revealed that some of the catalyst sheets developed startup delays and marked evolutions of smoke and smell. Recombiners not meeting the inspection criterion were completely regenerated as a measure of precaution. A preventive study was conducted jointly with institutes of the Juelich Research Center and the Aachen Technical University to analyze the composition of the deposits, which was then compared with the chemical characteristics of potential sources in the reactor containment. At the same time, the influence on effectiveness of the catalyst sheets was examined. On the basis of a random evaluation of the in-service inspection logs of the past few years, representative samples were taken whose startup behavior and operating characteristics were studied in a test rig alongside chemical analyses so as to allow a correlation to be established between the analytical findings and the catalytic activity of the samples. The findings made allowed internal sources of the catalyst deposits to be excluded. The impurities are introduced with the outside air. As a consequence, the air ducts in the vicinity of the respective recombiners were inspected and optimization steps were taken in connection with in-service inspections and regeneration procedures. (orig.)

  8. The importance of the AVR pebble-bed reactor for the future of nuclear power

    Pohl, P.

    2006-01-01

    The AVR pebble-bed high temperature gas-cooled reactor (HTGR) at Juelich (Germany)) operated from 1967 to 1988 and was certainly the most important HTGR project of the past. The reactor was the mass test bed for all development steps of HTGR pebble fuel. Some early fuel charges failed under high temperature conditions and contaminated the reactor. An accurate pebble measurement (Cs 137) allowed to clean the core from unwanted pebbles after 1981. The coolant activity went down and remained very low for the remaining reactor operation. A melt-wire experiment in 1986 revealed max. coolant temperatures of >1280 deg. C and fuel temperatures of >1350 deg. C, explained by under-estimated bypasses. The fuel still in the core achieved high burn-ups and showed under the extreme temperature conditions excellent fission product retention. Thus, the AVR operation qualified the HTGR fuel, and an average discharge burn-up of 112% fifa revealed an excellent fuel economy of the pebble-bed reactor. Furthermore, the AVR operation offers many meaningful data for code-to-experiment comparisons. (authors)

  9. A review of the demonstration of innovative solvent extraction processes for the recovery of trivalent minor actinides from PUREX raffinate

    Modolo, G.; Wilden, A.; Geist, A.; Magnusson, D.; Malmbeck, R.

    2012-01-01

    The selective partitioning (P) of long-lived minor actinides from highly active waste solutions and their transmutation (T) to short-lived or stable isotopes by nuclear reactions will reduce the long-term hazard of the high-level waste and significantly shorten the time needed to ensure their safe confinement in a repository. The present paper summarizes the on-going research activities at Forschungszentrum Juelich (FZJ), Karlsruher Institut fuer Technologie (KIT) and Institute for Transuranium Elements (ITU) in the field of actinide partitioning using innovative solvent extraction processes. European research over the last few decades, i.e. in the NEWPART, PARTNEW and EUROPART programmes, has resulted in the development of multi-cycle processes for minor actinide partitioning. These multi-cycle processes are based on the co-separation of trivalent actinides and lanthanides (e.g. by the DIAMEX process), followed by the subsequent actinide(III)/lanthanide(III) group separation in the SANEX process. The current direction of research for the development of innovative processes within the recent European ACSEPT project is discussed additionally. This paper is focused on the development of flow-sheets for recovery of americium and curium from highly active waste solutions. The flow-sheets are verified by demonstration processes, in centrifugal contactors, using synthetic or genuine fuel solutions. The feasibility of the processes is also discussed. (orig.)

  10. Program status of the high temperature reactor development in the Federal Republic of Germany

    1984-01-01

    The status of the HTR development program in the Federal Republic of Germany in 1984 is characterized by the beginning of a transition phase from a national program to a commercial program. In the last 20 years the HTR technology program was strongly, nearly completely supported by the Federal Government and the State Government of North-Rhine-Westfalia. Funding of the program up to now exceeded 5 billion DM. Within this framework it was possible to establish competent-reactor-system companies, to enable industries to supply HTR- specific components including fuel elements and nuclear graphites, to maintain the strong engagement of the national centre KFA Juelich in general R and D activities, to build and operate the AVR-plant for more than 16 years, to erect the demonstration plant THTR-300 now approaching completion and to build and operate many efficient test facilities. Thereby the HTR technology development achieved a stage of maturity which is not only considered to be most advanced, but is also ready now for commerical deployment. The assessment report which comprised both the fast breeder and the HTR development included all major impacts, such as history, status, prospects, benefits, industrial aspects and international developments of the technology. The program description is facilitated by distinguishing the five major program elements: AVR, THTR-300, THTR follow-up plant, nuclear process heat program, fuel cycle activities

  11. Study on the profitableness of electricity generation with high temperature reactors

    Kolb, G.

    1978-08-01

    The programme group 'Systemforschung und Technologische Entwicklung' (STE) of the Nuclear Research Centre Juelich in cooperation with the internal institutions 'Projekttraegerschaft Entwicklung von Hochtemperaturreaktoren' (PTH) and 'Institut fuer Reaktorentwicklung' (IRE) on the one hand, and the external partner 'Hochtemperatur-Reactorbau GmbH' (HRB) and 'Gesellschaft fuer Hochtemperaturreactor Technik' (GHT) on the other hand have set up a study on fuel cycle costs, electricity production cost and the economical use as well as uranium resource protection by introduction of high temperature reactors (HTR) with pebble bed core to generate electricity. The pressurized-water reactor (PWR) today on the market serves as comparison. The working results obtained sofar are compiled in the present report. It was particularly noted that - the HTR can economically fully compete with the PWR for electricity generation - the necessary supply of natural uranium for the HTR in open circuit is about one third lower and in the closed circuit, almost two thirds lower than in the corresponding PWR. A further reduction is possible on a long-term basis by highly converting HTW systems. (orig.) [de

  12. High-temperature materials and structural ceramics

    1990-01-01

    This report gives a survey of research work in the area of high-temperature materials and structural ceramics of the KFA (Juelich Nuclear Research Center). The following topics are treated: (1) For energy facilities: ODS materials for gas turbine blades and heat exchangers; assessment of the remaining life of main steam pipes, material characterization and material stress limits for First-Wall components; metallic and graphitic materials for high-temperature reactors. (2) For process engineering plants: composites for reformer tubes and cracking tubes; ceramic/ceramic joints and metal/ceramic and metal/metal joints; Composites and alloys for rolling bearing and sliding systems up to application temperatures of 1000deg C; high-temperature corrosion of metal and ceramic material; porous ceramic high-temperature filters and moulding coat-mix techniques; electrically conducting ceramic material (superconductors, fuel cells, solid electrolytes); high-temperature light sources (high-temperature chemistry); oil vapor engines with caramic components; ODS materials for components in diesel engines and vehicle gas turbines. (MM) [de

  13. Texture analysis with neutron bending on geological/mineralogical multi-phase samples using a locally resolving detector and profile analysis

    Merz, P.L.

    1991-02-01

    In the context of this work, the NANCY four circuit diffractometer of the University of Bonn at the RRJ2 research reactor at KFA Juelich was equipped with a linear locally resolving scintillation detector JULIOS. To evaluate the diffractogram occurring at a pole figure measurement, user-friendly profile analysis and other evaluation programs were developed on the PC. The course of evaluation was largely automated, so that only a few interactive steps are required. The measuring period of a sample is usually two to three days. Up to 35 pole figures are produced, depending on the phase conditions of the examined sample. The evaluation of up to 900 diffractograms with the aid of the automatically running profile analysis program takes between 30 and 100 minutes on a 20 MHz PC 386. Pole figure datafiles are produced from the intensity data obtained in this way by a conversion program. The texture analyses of copper pyrites ores introduced here are connected with geological questions. (orig.) [de

  14. Experiences with a small scale Solar/Wind pilot installation for basic electrification in the chilean altiplano

    Sapiain, Raul; Ovalle, Ricardo; Torres, Ariel; Brockmeyer, Ricarda; Schmidt, Reinhold [Centro de Energias Renovables/Universidad de Tarapaca, Arica, (Chile); Meer, Andreas V. [Solar Institute, Juelich (Germany)

    1997-12-31

    Basic rural electrification programmes are already carried out in the rural areas of northern Chile by local communities and local governments using photovoltaic systems. Solar Home Systems, 12 VDC are installed for individual households while systems for schools, public lighting etc. are realized with bigger systems, 220 VAC. Within a cooperation with the Solar Institute of the Fachhochschule Juelich, Germany, the Renewable Energy Center of the University of Tarapaca designed, installed and evaluated the first solar/wind hybrid installation for basic electrification in northern Chile, realized in Colpitas, a typical small village in the chilean altiplano. The following paper presents results and experiences of this first pilot installation. [Espanol] Ya se estan llevando a cabo programas de electrificacion rural basica en las areas rurales del Norte de Chile por las comunidades y los gobiernos locales, usando sistemas fotovoltaicos. Se instalan Sistemas Domesticos Solares de 12VDC para casas-habitacion individuales, mientras que los sistemas para escuelas, alumbrado publico, etc., se ejecutan con sistemas mas grandes de 220VAC. Con la coperacion del Instituto Solar de la Fachhochschule en Julich, Alemania, el Centro de Energia Renovable de la Universidad de Tarapaca, diseno, instalo y evaluo, la primera instalacion hibrida solar/viento para electrificacion basica en el Norte de Chile, realizado en Colpitas, un pueblo tipico pequeno del altiplano chileno. El siguiete articulo presenta los resultados y experiencias de esta primera instalacion piloto.

  15. Studies on internal friction in electron-irradiated iron crystals after plastic deformation

    Wolf, J.

    1986-01-01

    For the analysis of atomic point defects in high-purity the generation of atomic point defects was, above all, carried out by electron radiation, but in addition, also by plastic deformation. The exposure to radiation was realized at different temperatures in the Dynamitron of the University of Stuttgart (80 K, 160 K) and also in the low-temperature radiation facility of the nuclear research plant (KfA) Juelich (50 K). The radiation doses ranged between 2.7.10 21 e - /m 2 and 1.0.10 23 e - /m 2 . In situ plastic deformation was achieved at about 80 K (torsion, 4%). Internal friction which was determined in an inverse torsion pendulum in the temperature range of 80 K - 700 K and at frequencies of about 1 Hz served as defect indicator. In this study simulation programs were developed which were to give information prior to the realization of measurements on the temperatures and the intensity of the damping peaks to be expected. The internal friction peaks measured in the framework of this study could be assigned to the recovery stages I-IV. The measured values were discussed for three temperature ranges with main emphasis on the investigation of the recovering, radiation-induced or deformation-induced, atomic point defect in the temperature range of the recovery stage III (200 K - 270 K). (orig./MM) [de

  16. Postirradiation examination of HTR fuel

    Nabielek, H.; Reitsamer, G.; Kania, M.J.

    1986-01-01

    Fuel for the High Temperature Reactor (HTR) consists of 1 mm diameter coated particles uniformly distributed in a graphite matrix within a cold-molded 60 mm diameter spherical fuel element. Fuel performance demonstrations under simulated normal operation conditions are conducted in accelerated neutron environments available in Material Test Reactors and in real-time environments such as the Arbeitsgemeinschaft Versuchsreaktor (AVR) Juelich. Postirradiation examinations are then used to assess fuel element behavior and the detailed performance of the coated particles. The emphasis in postirradiation examination and accident testing is on assessment of the capability for fuel elements and individual coated particles to retain fission products and actinide fuel materials. To accomplish this task, techniques have been developed which measures fission product and fuel material distributions within or exterior to the particle: Hot Gas Chlorination - provides an accurate method to measure total fuel material concentration outside intact particles; Profile Electrolytic Deconsolidation - permits determination of fission product distribution along fuel element diameter and retrieval of fuel particles from positions within element; Gamma Spectrometry - provides nondestructive method to measure defect particle fractions based on retention of volatile metallic fission products; Particle Cracking - permits a measure of the partitioning of fission products between fuel kernel and particle coatings, and the derivation of diffusion parameters in fuel materials; Micro Gas Analysis - provides gaseous fission product and reactive gas inventory within free volume of single particles; and Mass-spectrometric Burnup Determination - utilizes isotope dilution for the measurement of heavy metal isotope abundances

  17. Spallation reactions and energy deposition in heavy target materials comparison of measurements and MC-calculations

    Filges, D.; Enke, M.; Galin, J.

    2001-01-01

    A renascence of interest for energetic proton induced production of neutrons originates recently by the inception of new projects for target stations of intense spallation neutron sources (like the planned European Spallation Source ESS), accelerator-driven nuclear reactors, nuclear waste transmutation and also the application for radioactive beams. Here we verify the predictive power of transport codes currently on the market by confronting observables and quantities of interest with an exhaustive matrix of benchmark data essentially coming from two experiments being performed at the Cooler Synchrotron COSY at Juelich. Program packages like HERMES, LCS or MCNPX master the prevision of reaction cross sections, hadronic interaction lengths, averaged neutron multiplicities and neutron multiplicity distributions in thick and thin(!) targets for a wide spectrum of incident proton energies, geometrical shapes and materials of the target. While also the observables related to the energy deposition in thick targets are in a good agreement with the model predictions, the production cross section measurements however for light charged particles on thin targets point out that problems exist within these models. (author)

  18. Results from EDDA at COSY: Spin Observables in Proton-Proton Elastic Scattering

    Rohdjess, Heiko

    2003-01-01

    Elastic proton-proton scattering as one of the fundamental hadronic reactions has been studied with the internal target experiment EDDA at the Cooler-Synchrotron COSY/Juelich. A precise measurement of differential cross section, analyzing power and three spin-correlation parameters over a large angular (θc.m. ≅ 35 deg. - 90 deg.) and energy (Tp ≅ 0.5 - 2.5 GeV) range has been carried out in the past years. By taking scattering data during the acceleration of the COSY beam, excitation functions were measured in small energy steps and consistent normalization with respect to luminosity and polarization. The experiment uses internal fiber targets and a polarized hydrogen atomic-beam target in conjunction with a double-layered, cylindrical scintillator hodoscope for particle detection. The results on differential cross sections and analyzing powers have been published and helped to improve phase shift solutions. Recently data taking with polarized beam and target has been completed. Preliminary results for the spin-correlation parameters A NN, ASS, and ASL are presented. The observable ASS has been measured the first time above 800 MeV and our results are in sharp contrast to phase-shift predictions at higher energies. Our analysis shows that some of the ambiguities in the direct reconstruction of scattering amplitudes which also show up as differences between available phase-shift solutions, will be reduced by these new measurements

  19. The control system of the polarized internal target of ANKE at COSY

    Kleines, H. [Zentralinstitut fuer Elektronik, Forschungszentrum Juelich, 52425 Juelich (Germany); Sarkadi, J. [Zentralinstitut fuer Elektronik, Forschungszentrum Juelich, 52425 Juelich (Germany); Zwoll, K. [Zentralinstitut fuer Elektronik, Forschungszentrum Juelich, 52425 Juelich (Germany); Engels, R. [Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany); Grigoryev, K. [Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany); Mikirtychyants, M. [Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany); Nekipelov, M. [Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany); Rathmann, F. [Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany); Seyfarth, H. [Institut fuer Kernphysik, Forschungszentrum Juelich, 52425 Juelich (Germany)]. E-mail: h.seyfarth@fz-juelich.de; Kravtsov, P. [St. Petersburg Nuclear Physics Institute, 188350 Gatchina (Russian Federation); Vasilyev, A. [St. Petersburg Nuclear Physics Institute, 188350 Gatchina (Russian Federation)

    2006-05-10

    The polarized internal target for the ANKE experiment at the Cooler Synchrotron COSY of the Forschungszentrum Juelich utilizes a polarized atomic beam source to feed a storage cell with polarized hydrogen or deuterium atoms. The nuclear polarization is measured with a Lamb-shift polarimeter. For common control of the two systems, industrial equipment was selected providing reliable, long-term support and remote control of the target as well as measurement and optimization of its operating parameters. The interlock system has been implemented on the basis of SIEMENS SIMATIC S7-300 family of programmable logic controllers. In order to unify the interfacing to the control computer, all front-end equipment is connected via the PROFIBUS DP fieldbus. The process control software was implemented using the Windows-based WinCC toolkit from SIEMENS. The variety of components, to be controlled, and the logical structure of the control and interlock system are described. Finally, a number of applications derived from the present development to other, new installations are briefly mentioned.

  20. Conceptual design for a bulk tungsten divertor tile in JET

    Mertens, Ph.; Hirai, T.; Linke, J.; Neubauer, O.; Pintsuk, G.; Philipps, V.; Sadakov, S.; Samm, U.; Schweer, B.

    2007-01-01

    The ITER-like Wall project (ILW) for JET aims at providing the plasma chamber of the tokamak with an environment of mixed materials which will be relevant for the actual first wall construction on ITER. Tungsten plays a key role in the divertor cladding. For the central tile, also called LB-SRP for 'load-bearing septum replacement plate', bulk tungsten is envisaged in order to cope with the high heat loads expected (up to 10 MW/m 2 for 10 s). The outer strike-point in the divertor will be positioned on this tile for the most relevant configurations. Forschungszentrum Juelich (FZJ) has developed a conceptual design based on an assembly of tungsten blades or lamellae. An appropriate interface with the base carrier of JET, on which modules of two tiles are positioned and fixed by remote handling procedures, is a substantial part of the integral design. Important issues are the electromagnetic forces and expected temperature distributions. Material choices combine tungsten, TZM TM , Inconel and ceramic parts. The completed design has been finalised in a proposal to the ILW project, with utmost ITER-relevance

  1. Online control package for COSY-TOF experiment

    Borodina, Ekaterina [Institute fuer Kernphysik I, Forschungszentrum Juelich GmbH, 52325, Juelich (Germany); Moscow State Institute of Electronics and Mathematics (Russian Federation); Roderburg, Eduard; Ritman, James [Institute fuer Kernphysik I, Forschungszentrum Juelich GmbH, 52325, Juelich (Germany)

    2009-07-01

    The new Straw Tube Tracker and Quirl Microstrip detectors have been installed at the TOF (Time Of Flight) experiment at the COSY accelerator in IKP FZ-Juelich. These new detectors increase the number of channels of the COSY-TOF detector by about a factor of 3. Therefore, a new control package to adjust electronic parameters and for control the proper functionality of all channels is being developed. The online controlling based on visualization of key parameters of detectors plays an important role. The concept and the techniques of the online software package are developed for the COSY-TOF experiment. It consists of conversion software, which transforms a binary data stream from the DAQ to detector oriented event format, methods of IPC (Inter-Process Communications), and GUI (graphical user interface). To achieve data transfer through the network and real time data performance the IPC tools - sockets and shared memory are used. A special GUI, TOF-ONLINE has been developed, based on ROOT. The GUI allows the detectors, plotting spectra, resetting data, etc., to be selected in an intuitive way. Examples of the visualization and the results of the first beam time will be introduced.

  2. Aerosol size characteristics in selected working areas

    Ahmed, K.

    1984-05-01

    This report presents the work done to study the aerosol activity size distributions and their respirable fractions in some selected areas of the Juelich Nuclear Research Center. Anderson cascade impactors were used to find the aerodynamic size ranges of the airborne particles for subsequent analysis of activity associated with each size group. The aerosols were found to follow in general log-normal distributions in the hot cells with values of AMAD between 5 and 10 μm. Measurements in the AVR containment and decontamination laboratory in Uranit GmbH showed deviations from log-normal distribution. In the waste press area the distribution is sometimes log-normal and sometimes not, depending upon the origin of waste. The values of AMAD are in the range of 2 to 4 μm in these areas. The respirable fractions were calculated using ACGIH definition for respirable dust to be < 25% in hot cells and < 60% in other areas. Pulmonary depositions according to ICRP model were < 10% and < 15% respectively. (orig./HP)

  3. Utilization of methanol for polymer electrolyte fuel cells in mobile systems

    Schmidt, V M [Research Centre Juelich (KFA), Inst. of Energy Process Engineering (Germany); Broeckerhoff, P [Research Centre Juelich (KFA), Inst. of Energy Process Engineering (Germany); Hoehlein, B [Research Centre Juelich (KFA), Inst. of Energy Process Engineering (Germany); Menzer, R [Research Centre Juelich (KFA), Inst. of Energy Process Engineering (Germany); Stimming, U [Research Centre Juelich (KFA), Inst. of Energy Process Engineering (Germany)

    1994-04-01

    The constantly growing volume of road traffic requires the introduction of new vehicle propulsion systems with higher efficiency and drastically reduced emission rates. As part of the fuel cell programme of the Research Centre Juelich a vehicle propulsion system with methanol as secondary energy carrier and a polymer electrolyte membrane fuel cell (PEMFC) as the main component for energy conversion is developed. The fuel gas is produced by a heterogeneously catalyzed steam reforming reaction in which methanol is converted to H[sub 2], CO and CO[sub 2]. The required energy is provided by the catalytic conversion of methanol for both heating up the system and reforming methanol. The high CO content of the fuel gas requires further processing of the gas or the development of new electrocatalysts for the anode. Various Pt-Ru alloys show promising behaviour as CO-tolerant anodes. The entire fuel cell system is discussed in terms of energy and emission balances. The development of important components is described and experimental results are discussed. (orig.)

  4. Hydrogen from methanol for fuel cells in mobile systems: development of a compact reformer

    Hoehlein, B [Forschungszentrum Juelich GmbH (Germany); Boe, M [H. Topsoee A/S, Lyngby (Denmark); Boegild-Hansen, J [H. Topsoee A/S, Lyngby (Denmark); Broeckerhoff, P [Forschungszentrum Juelich GmbH (Germany); Colsman, G [Forschungszentrum Juelich GmbH (Germany); Emonts, B [Forschungszentrum Juelich GmbH (Germany); Menzer, R [Forschungszentrum Juelich GmbH (Germany); Riedel, E

    1996-07-01

    On-board generation of hydrogen from methanol with a reformer in connection with the use of a proton-exchange membrane fuel cell (PEMFC) is an attractive option for a passenger car drive. Special considerations are required to obtain low weight and volume. Furthermore, the PEMFC of today cannot tolerate more than 10 ppm of carbon monoxide in the fuel. Therefore a gas conditioning step is needed after the methanol reformer. Our main research activities focus on the conceptual design of a drive system for a passenger car with methanol reformer and PEMFC: Engineering studies with regard to different aspects of this design including reformer, catalytic burner, gas conditioning, balances of the fuel cycles and basic design of a compact methanol reformer. The work described here was carried out within the framework of a JOULE II project of the European Union (1993-1995). Extensive experimental studies have been carried out at the Forschungszentrum Juelich GmbH (KFA) in Germany and at Haldor Topsoee A/S in Denmark. (orig.)

  5. Compact methanol reformer test for fuel-cell powered light-duty vehicles

    Emonts, B; Hoehlein, B; Peters, R [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Energieverfahrenstechnik (IEV); Hansen, J B; Joergensen, S L [Haldor Topsoe A/S, Lyngby (Denmark)

    1998-03-15

    On-board production of hydrogen from methanol based on a steam reformer in connection with the use of low-temperature fuel-cells (PEMFC) is an attractive option as energy conversion unit for light-duty vehicles. A steam reforming process at higher pressures with an external burner offers advantages in comparison to a steam reformer with integrated partial oxidation in terms of total efficiency for electricity production. The main aim of a common project carried out by the Forschungszentrum Juelich (FZJ), Haldor Topsoee A/S (HTAS) and Siemens AG is to design, to construct and to test a steam reformer reactor concept (HTAS) with external catalytic burner (FZJ) as heat source as well as catalysts for heterogeneously catalyzed hydrogen production (HTAS), concepts for gas treatment (HTAS, FZJ) and a low-temperature fuel cell (Siemens). Based on the experimental results obtained so far concerning methanol reformers, catalytic burners and gas conditioning units, our report describes the total system, a test unit and preliminary test results related to a hydrogen production capacity of 50 kW (LHV) and dynamic operating conditions. This hydrogen production system is aimed at reducing the specific weight (<2 kg/kW{sub th} or 4 kg/kW{sub el}) combined with high efficiency for net electricity generation from methanol (about 50%) and low specific emissions. The application of Pd-membranes as gas cleaning unit fulfill the requirements with high hydrogen permeability and low cost of the noble metal. (orig.)

  6. Stand-alone power systems for the future: Optimal design, operation and control of solar-hydrogen energy systems

    Ulleberg, Oeystein

    1999-12-31

    This thesis gives a systematic review of the fundamentals of energy systems, the governing physical and chemical laws related to energy, inherent characteristics of energy system, and the availability of the earth`s energy. It shows clearly why solar-hydrogen systems are one of the most viable options for the future. The main subject discussed is the modelling of SAPS (Stand-Alone Power Systems), with focus on photovoltaic-hydrogen energy systems. Simulation models for a transient simulation program are developed for PV-H{sub 2} components, including models for photovoltaics, water electrolysis, hydrogen storage, fuel cells, and secondary batteries. A PV-H{sub 2} demonstration plant in Juelich, Germany, is studied as a reference plant and the models validated against data from this plant. Most of the models developed were found to be sufficiently accurate to perform short-term system simulations, while all were more than accurate enough to perform long-term simulations. Finally, the verified simulation models are used to find the optimal operation and control strategies of an existing PV-H{sub 2} system. The main conclusion is that the simulation methods can be successfully used to find optimal operation and control strategies for a system with fixed design, and similar methods could be used to find alternative system designs. 148 refs., 78 figs., 31 tabs.

  7. A new extremity dosemeter for beta and gamma radiation

    Heinzelmann, M.; Pagenkamper, M.

    1988-01-01

    An extremity dosemeter developed at the Juelich Nuclear Research Centre is very well suited for the precise and energy-independent measurement of the skin dose generated by beta or gamma radiation. This is also confirmed by the results of this intercomparison programme. The dosemeter contains three TLDs of LiF in Teflon mounted behind a window of 0.9 mg/cm 2 . The great advantage of this dosemeter is three TLD's enabling statements about the radiation quality. However, the dosemeter has two disadvantages The dosemeter is complicated to manufacture. A very thin plastic foil of 0.9 mg/cm 2 must be attached to a support. This work is difficult and time-consuming and cannot be automated. The window in front of the TLD is not sturdy enough and is occasionally destroyed when the dosemeter is being worn. These two disadvantages prevent this extremity dosemeter from being used more frequently. For this reason, work was begun on developing a new extremity dosemeter without these two disadvantages. The great advantage of the previous dosemeter of obtaining statements about the type of radiation with the aid of readings from three TLD's was to be retained. The improved extremity dosemeter has a more sturdy and thicker window with a similar response as the previous dosemeter with a thinner window

  8. Electromagnetic transition form factor of the η meson with WASA-at-COSY

    Goswami, Ankita [Indian Institute of Technology Indore, Indore (India); Collaboration: WASA-at-COSY-Collaboration

    2015-07-01

    The aim of this work is to measure the transition form factor of the η meson. The transition form factor describes the internal structure of a particle. The precise determination of the transition form factor of the η meson is possible through the η→γe{sup +} e{sup -} Dalitz decay. When a particle is point-like then its decay rate can be calculated within QED. However, the complex structure of the particle modifies its decay rate. The transition form factor is determined by comparing the lepton-antilepton invariant mass distribution with QED. η mesons are produced using the reaction pp→ppη at a beam kinetic energy of 1.4 GeV at the COSY accelerator of Forschungszentrum Juelich and decay particles of the η meson are detected with the WASA detector. In the higher invariant mass region recent theoretical calculations slightly deviate from the the data. With the high statistics dataset we expect precise results in the higher invariant mass region. The status of the analysis is reported.

  9. Existing and projected neutron sources and low-temperature irradiation facilities in Germany

    Boening, K.

    1984-01-01

    In this paper, a contribution given at the Kyoto University Research Reactor Institute to the temporal meeting on the design of the facilities for high flux, low temperature irradiation is summarized. The following five subjects were discussed. The project of modernizing the swimming pool type research reactor FRM with 4 MW power at Munich is to achieve relatively high thermal neutron flux, and an extremely compact core is designed. The existing low temperature irradiation facility (LTIF) of the FRM is the most powerful in the world, and has been successfully operated more than 20 years. The fast and thermal neutron fluxes are 2.9 x 10 13 and 3.5 x 10 13 /cm 2 sec, respectively. The experimental techniques in the LTIF of the FRM, such as a measuring cryostat, the mounting of irradiated samples and so on, are described. The installation of new LTIFs in connection with the projects of advanced neutron sources in Germany is likely to be made in the modernized FRM at Garching, in the spallation neutron source SNQ at KFA Juelich and so on. The interesting problems in fundamental and applied researches with LTIFs, and the unusual application of LTIFs are shown. (Kako, I.)

  10. IRPhE-HTR-ARCH-01, Archive of HTR Primary Documents

    2004-01-01

    Description: High Temperature Reactor Studies, including experiments in critical facilities or in prototypes have been carried out in the past. Information gathered, experience gained and experimental data produced are of value for the development of future advanced HTRs. For the purpose of knowledge, competence, information preservation and management, computer readable archives have been established. The present archive includes several relevant documents relative to the following: - Graphite Moderated Critical Facility, CESAR at Cadarache. Dragon Countries Physics Meetings (DCPM); - OTTO Pebble Bed Reactors; - Gulf - HTGR Experiments; - Zero Power MARIUS Reactor; - Pebble-bed KAHTER Critical Facility; - Helium Cooled Fast Reactor Assessment Studies; - Gas Cooled Reactor Technology Safety and Siting; - Initial Evaluation of the Gas-Turbine Modules HTGCR; - A report on Nuclear Graphite; - AVR Reactor Juelich (new in version 02); - HTR IAEA proceedings (new in version 02); - Studies at IRI Delft(new in version 02); - Studies and experiments at PSI Villigen (new in version 02); 2 - Related or auxiliary information: IRPHE-DRAGON-DPR, high Temperature Reactor Dragon Project, Primary Documents NEA-1726/01. 3 - Software requirements: Acrobat Reader, Microsoft Word, HTML Browser required

  11. Fission product retention in TRISO coated UO2 particle fuels subjected to HTR simulated core heating tests

    Baldwin, C.A.; Kania, M.J.

    1991-01-01

    Results of the examination and analysis of 25,730 individual microspheres from spherical fuel elements HFR-K3/1 and HFR-K3/3 are reported. The parent spheres were irradiated in excess of end-of-life exposure and subsequently subjected to simulated core heating tests in a special high-temperature furnace at Forschungszentrum, Juelich, GmbH (KFA). Following the heating tests, the spheres were electrolytically deconsolidated to obtain unbounded fuel particles for Irradiated Microsphere Gamma Analyzer (IMGA) analysis. For sphere HFR-K3/1, which was heated for 500 h at 1600 deg. C, only four particles were identified as having released fission products. The remaining particles from the sphere showed no statistical evidence of fission product release. Scanning Electron Microscopy (SEM) examination showed that three of the defect particles had large sections of the TRISO coating missing, while the fourth appeared normal. For sphere HFR-K3/3, which was heated for 100 h at 1800 deg. C, the IMGA data revealed that fission product release (cesium) from individual particles was significant and that there was large particle-to-particle variation in retention capabilities. Individual particle release (cesium) averaged ten times the KFA-measured integral spherical fuel element release value. In addition, the bimodal distribution of the individual particle data indicated that two distinct modes of failure at fuel temperatures of 1800 deg. C and above may exist. (author). 6 refs, 6 figs, 4 tabs

  12. Is rapid development of nuclear power purposeful

    1977-01-01

    The questions of the development of nuclear energy are discussed with regard to the efficacy of investments. The results are given of studies carried out at the nuclear research institute in Juelich in the FRG. At the estimated 25 years' service-life of the reactor and 0.2% uranium concentration in ore the following results were obtained: Total energy consumption for the construction and operation of a light water reactor power plant makes up 4.6% of the total power production, and in high-temperature reactors it amounts to 3.5%, both with uranium enrichment by the diffusion process. In uranium enrichment by centrifugal technology, consumption drops to 1.25% for LWRms and to 0.9% for high-temperature reactors, in fast breeder reactors it makes up only 0.8% of the total power production of the nuclear power plant. The period during which a nuclear power plant produces the amount of power consumed in construction and operation is 1.2 to 2.5 months which makes it less costly and more economical than any power plant burning coal minus the negative environmental impacts of such power plants.

  13. ILIAS - Ion and laser beam interaction and application studies. A scientific portrait of the PHELIX theory group

    Bock, R. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Gibbon, P. [Forschungszentrum Juelich GmbH (Germany). Zentralinstitut fuer Angewandte Mathematik; Maruhn, J.A. [Frankfurt Univ. (Germany). Inst. fuer Theoretische Physik; Mulser, P. [Technische Univ. Darmstadt (DE). Theoretical Quantum Electronics (TQE); Scheid, W. [Justus-Liebig-Univ., Giessen (Germany). Inst. fur Theor. Phys.; Schlegel, T. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany). Theoretische Abteilung; Tauschwitz, A.

    2005-06-01

    In January 2005 R. Bock (GSI), P. Gibbon (FZ Juelich), J. Maruhn (Univ. Frankfurt), P. Mulser (TU Darmstadt), W. Scheid (Univ. Giessen), and T. Schlegel (GSI) established the ILIAS study group in high power laser interaction theory, with the following goals: To disseminate within ILIAS and collaborators the expertise in plasma, atomic, nuclear and nonlinear physics, and numerical simulation techniques held by individual members of the ILIAS study group. To coordinate the theoretical activities related to petawatt physics with lasers at GSI. To explore the potential of intense laser beams interacting with bulk matter, heavy ion beams and with mass-limited systems and single particles (e.g. cluster, mesoscopic and atomic physics). To propose relevant experiments for the PHELIX project and to discuss them in detail with the experimentalists in order to arrive at a coherent, GSI-specific scientific program. In elaborating such a concept the availability of the GSI accelerator system for laser petawatt experiments will play a major role. To attract and involve students and young researchers to establish a stable theoretical group of young experts. This goal could be reached within 2 - 3 years from now. To intensify these efforts a regular seminar is already held by the ILIAS members. By individual members pertinent lectures and seminars will be offered at their respective Universities. (orig.)

  14. Neutron irradiation embrittlement of reactor pressure vessel steel 20 MnMoNi55 weld

    Ghoneim, M.M.

    1987-05-01

    The effect of neutron irradiation on the mechanical and fracture properties of an 'improved' 20 MnMoNi 55 Pressure Vessel Steel (PVS) weld was investigated. In addition to very low residual element content, especially Cu (0.035 wt.%), and relatively higher Ni content (0.9 wt.%), this steel has higher strength (30% more) than the steels used currently in nuclear reactor pressure vessels. The material was irradiated to 3.5x10 19 and 7x10 19 n/cm 2 (E > 1 Mev) at 290 0 C and 2.5x10 19 n/cm 2 (E > 1 MeV) at 160 0 C in FRJ-1 and FRJ-2 research reactors at KFA, Juelich, F.R.G. Test methods used in the evaluation included instrumented impact testing of standard and precracked Charpy specimens, tensile, and fracture toughness testing. Instrumented impact testing provided load and energy vs. time (deflection) data in addition to energy absorption data. The results indicated that the investigated high strength improved steel is more resistant to irradiation induced embrittlement than conventional PVSs. (orig./IHOE)

  15. In-pile testing of ITER first wall mock-ups at relevant thermal loading conditions in the LVR-15 nuclear research reactor

    Kysela, Jan [Research Centre Rez, Hlavni 130, 250 68 Husinec-Rez (Czech Republic); Entler, Slavomir, E-mail: slavomir.entler@cvrez.cz [Research Centre Rez, Hlavni 130, 250 68 Husinec-Rez (Czech Republic); Vsolak, Rudolf; Klabik, Tomas [Research Centre Rez, Hlavni 130, 250 68 Husinec-Rez (Czech Republic); Zlamal, Ondrej [CEZ, Duhova 2/1444, 140 53 Praha 4 (Czech Republic); Bellin, Boris; Zacchia, Francesco [Fusion for Energy, Josep Pla, 2, Torres Diagonal Litoral B3, 08019 Barcelona (Spain)

    2015-10-15

    Highlights: • Irradiated thermal fatigue testing of the ITER primary first wall mock-ups. • Cyclic heat flux of 0.5 MW/m{sup 2} in the neutron field of the nuclear reactor core. • 17,040 thermal cycles. • Radiation damage in the range of 0.41–1.17 dpa depending on the material. - Abstract: The TW3 in-pile rig enabled the thermal fatigue testing of ITER primary first wall mock-ups in the core of the nuclear reactor. This experiment investigated the neutron irradiation influence on the design performance under high heat flux testing. A thermal flux of 0.5 MW/m{sup 2} in the neutron field of the core of the LVR-15 nuclear reactor was applied. Within the scope of the tests with simultaneous neutron irradiation, the TW3 rig reached a record of 17,040 thermal cycles with the radiation damage in the range of 0.41–1.17 dpa depending on the material. Even after a high number of thermal cycles, while being irradiated by neutrons, no damage of the tested mock-ups was visually observed. Further testing and analysis will follow in the Forschungszentrum Juelich.

  16. Energy and the environment as an optimization problem

    Walbeck, M.; Wagner, H.J.; Martinsen, D.; Bundschuh, V.

    1988-01-01

    The authors develop approaches and outline solutions leading to a more ecologically oriented strategy of energy utilisation, including outline solutions envisaging a possible change-over to a novel energy system. The frame of the study is set by the following conditions: Represent the energy systems as a combination of technologies; geographic area under review is the Federal Republic of Germany; the time period to be considered is 50 years; consider rates of change; compare currently available and novel energy systems to be set out and defined; cost (market criteria) and emissions (environmental criteria) are the criteria of comparison; energy supply and energy utilisation are the functions of the technology combinations of energy systems to be described. The book almost like a textbook explains the path from problem definition to model establishment and finally to description of possible applications, using as the leading example the MARNES model developed by the systems analysis project group of KfA Juelich. (orig./HSCH) With 52 figs., 27 tabs [de

  17. Decision analytic tools for resolving uncertainty in the energy debate

    Renn, O.

    1986-01-01

    Within the context of a Social Compatibility Study on Energy Supply Systems a complex decision making model was used to incorporate scientific expertize and public participation into the process of policy formulation and evaluation. The study was directed by the program group ''Technology and Society'' of the Nuclear Research Centre Juelich. It consisted of three parts: First, with the aid of value tree analysis the whole spectrum of concern and dimensions relevant to the energy issue in Germany was collected and structured in a combined value tree representing the values and criteria of nine important interest groups in the Federal Republic of Germany. Second, the revealed criteria were translated into indicators. Four different energy scenarios were evaluated with respect to each indicator making use of physical measurement, literature review and expert surveys. Third, the weights for each indicator were elicited by interviewing randomly chosen citizens. Those citizens were informed about the scenarios and their impacts prior to the weighting process in a four day seminar. As a result most citizens favoured more moderate energy scenarios assigning high priority to energy conservation. Nuclear energy was perceived as necessary energy source in the long run, but should be restricted to meet only the demand that cannot be covered by other energy means. (orig.)

  18. UFO--a multi-analyser option for IN12

    Schmidt, Wolfgang; Rheinstaedter, Maikel C.; Raymond, Stephane; Ohl, Michael

    2004-01-01

    The IN12 instrument is operated by FZ Juelich in collaboration with CEA Grenoble as a CRG-B instrument at the Institut Laue Langevin in Grenoble. As a three-axis spectrometer for cold neutrons it is dedicated for high-resolution studies of low-energy excitations. In the past years the instrument has been continuously improved and it has demonstrated its excellent performance for neutron scattering research. To meet further challenges as a state-of-the-art instrument in the next funding period we will propose to upgrade IN12 with a multi-analyser option similar to planned or existing RITA-type instruments. IN12 will then be optionally equipped with an array of individual analyser blades which can be positioned separately in order to map the scattered beam on a user-chosen path in (Q,ω)-space. We refer to this set-up as IN12-UFO (universal focusing option). Both, the feasibility and the scientific case are currently being studied. On the conference we will show details of the planned instrumental set-up and demonstrate its flexibility and multiplex advantages for specific physical applications

  19. Examination of the uncertainty in air concentration predictions using Hanford field data

    Miller, C.W.; Fields, D.E.; Cotter, S.J.

    1986-10-01

    The accuracy of an environmental transport model is best determined by comparing model predictions with environmental measurements made under conditions similar to those assumed by the model, a process commonly referred to as model validation. Over the past several years, we have done a variety of validation studies with the popular Gaussian plume atmospheric dispersion model using data from tests conducted on the Hanford reservation. Data for short-term releases of small particles for release heights of 2 m, 56 m, and 111 m have been used. Up to six different sets of atmospheric dispersion parameters and three different atmospheric stability class specification schemes have been examined. Overall, dispersion parameters based on measurements made near Juelich, West Germany, give the best comparisons between observed and predicted air concentrations. The commonly-used vertical temperature gradient method for determining atmospheric stability class consistently gives poor results. The accuracy of air concentration predictions improves when dry deposition processes are included in the model. Further validation studies using various Hanford data sets are planned

  20. Development work for the moderator of the ITR-fuel

    Duenner, P.; Becker, D.

    1973-06-01

    In the frame of the ITR-project (Incore-Thermionic-Reactor) fuel-moderator-materials had been investigated, which are also of interest for the KNK-project and which are therefore documented in this report. Partial pressure measurements on the systems Zr-H, Zr U-H, Y-H and YH-H revealed the premise for the elaboration of a hydration technique. On the basis of the functional relation between partial H 2 -pressure, temperature and H 2 -content of the hydride, an optimum hydration kinetic for the production of flawless and well defined hydrated Zirconium hydride/Uranium pellets and of Zirconium hydride and Yttrium hydride moderator bodies was developed. Alternatively to the ZrH x -U-technology a powder- metallurgical procedure for the production of a Y-U sinter-alloy as base material was tested. In an irradiation experiment in the DIDO reactor (in Juelich) the burnup behavior of Zirconium hydride-Uranium and Yttrium hydride-Uranium under ITR-similar conditions has been tested. With a U235-burnup of 6.75 % and an irradiation temperature of 490 deg C a fission gas release rate of 0.1 % was observed. The ZrH x -pellets remained mechanically intact, whereas the YH x -pellets crumbled during the post-examinations. The ZrH x -U showed a maximum density reduction of 4.2 % [de

  1. Measurement of the enrichment of uranium-hexafluoride gas in product pipes in the centrifuge enrichment plant at Almelo

    Packer, T.W.; Lees, E.W.; Aaldijk, J.K.; Harry, R.J.S.

    1987-09-01

    One of the objectives of safeguarding centrifuge enrichment plants is to apply non-destructive measurements inside the cascade area to confirm that the enrichment level is in the low enriched uranium range. Research in the UK and USA has developed a NDA instrument which can confirm the presence of low enriched uranium on a rapid go/no go basis in cascade header pipework of their centrifuge enrichment plants. The instrument is based on a gamma spectroscopic measurement coupled with an X-ray fluorescence analysis. This report gives the results of measurements carried out at Almelo by the UKAEA Harwell, ECN Petten and KFA Juelich to determine if these techniques could be employed at Almelo and Gronau. The energy dispersive X-ray fluorescence analysis has been applied to determine the total mass of uranium in the gas phase, and the deposit correction technique and the two geometry technique have been applied at Almelo to correct the measured gamma intensities for those emitted by the deposit. After an executive summary the report discusses the principles of the two correction methods. A short description of the equipment precedes the presentation of the results of the measurements and the discussion. After the conclusions the report contains two appendices which contain the derivation of the formulae for the deposit correction technique and a discussion of the systematic errors of this technique. 8 figs.; 11 refs.; 6 tables

  2. The electronic sealing system, VACOSS, as a control measure for international safeguards

    Kennepohl, K.; Maeckelburg, D.; Stein, G.

    1979-01-01

    The electronic sealing system VACOSS (Variable Coding Sealing System) was developed at KFA Juelich within the framework of an IAEA research contract. The seal is equipped with a light guide which acts as a lock. Statistical infra-red wavelength light pulses are transmitted via this light guide. The electronic components of the seal can store the opening and closing events of the light guide. In addition, the quasi-statistic treatment of code data fed into the seal by means of an adapter box guarantees an extremely high protection against unauthorized access. The portable seal is easy to handle, can be operated with a battery and can be re-used immediately after replacement of this battery. To make the seal operational code data are fed in, and the information stored in the seal can be read via the adapter box. Two versions of VACOSS were developed. VACOSS I permits the state of the seal in the facility to be checked on site only. VACOSS II can be monitored remotely by an operator passing on coded information. (author)

  3. Characterization of the source distribution of particulate matter and nitrogen oxides in rural and urban areas; Charakterisierung der Quellverteilung von Feinstaub und Stickoxiden in laendlichem und staedtischem Gebiet

    Urban, Susanna

    2010-07-01

    By the entry of anthropogenic emissions, the air quality is especially impacted in urban center. Thus, EU-wide limits of gas phase components, e.g. NO{sub 2} und O{sub 3}, and particulate matter concentration (PM10) exist to protect human health. Particularly, high particulate matter concentrations are more and more of interest because of their adverse health effect on the human respiratory system. Therefore a network of stationary measurements in different loaded and inhabited regions monitors the air quality in Germany. In contrast to these selective stationary facilities, this thesis presents mobile measurements to determine concentration fields of gases and particles. Therefore, a ''driving air-lab'' with a large set of temporally high resolved instruments to measure gas and particulate phase as well as geographical and meteorological parameters has been built up. The particulate measurement technique includes PM10- and PM2.5-collections and real-time ELPI measurements of time resolved particle size concentrations. Additionally, the installation of gas phase detection technique for NO{sub 2}, NO, O{sub 3}, CO as well as for volatile organic hydrocarbons completes the ''driving air-lab''. During the three measurement campaigns lasting several weeks the temporal and spatial distribution of particulate and gas phase concentrations in rural, suburban and urban area in the region of the Bodensee, in the city region of Duesseldorf and close to the highway in the area of Juelich could be determined and classified. During the measurement campaign ZEPTER-2 the ''driving air-lab'' formed the groundbase to the concurrent vertical profile measurements of the zeppelin. The comparison of the measuring systems of all parameters during the intermediate landing of the zeppelin showed a very good agreement. The use of adequate percentile filters allowed the separation of the local traffic peaks from the total background

  4. Erosion of newly developed CFCs and Be under disruption heat loads

    Nakamura, K.; Akiba, M.; Araki, M.; Dairaku, M.; Sato, K.; Suzuki, S.; Yokoyama, K.; Linke, J.; Duwe, R.; Bolt, H.; Roedig, M.

    1996-10-01

    An evaluation of the erosion under disruption heat loads is very important to the lifetime prediction of divertor armour tiles of next fusion devices such as ITER. In particular, erosion data on CFCs (carbon fiber reinforced composites) and beryllium (Be) as the armour materials is urgently required in the ITER design. For CFCs, high heat flux experiments on the newly developed CFCs with high thermal conductivity have been performed under the heat flux of around 800-2000 MW/m 2 and the pulse length of 2-5 ms in JAERI electron beam irradiation systems (JEBIS). As a result, the weight losses of B 4C doped CFCs after heating were almost same to those of the non doped CFC up to 5 wt% boron content. For Be, we have carried out our first disruption experiments on S65/C grade Be specimens in the Juelich divertor test facility in hot cells (JUDITH) facility as a frame work of the J—EU collaboration. The heating conditions were heat loads of 1250-5000 MW/m 2 for 2-8 ms, and the heated area was 3 × 3 mm 2. As a result, the protuberances of the heated area of Be were observed under the lower heat flux.

  5. Erosion of newly developed CFCs and Be under disruption heat loads

    Nakamura, K.; Duwe, R.; Bolt, H.; Roedig, M.

    1996-01-01

    An evaluation of the erosion under disruption heat loads is very important to the lifetime prediction of divertor armour tiles of next fusion devices such as ITER. In particular, erosion data on CFCs (carbon fiber reinforced composites) and beryllium (Be) as the armour materials is urgently required in the ITER design. For CFCs, high heat flux experiments on the newly developed CFCs with high thermal conductivity have been performed under the heat flux of around 800-2000 MW/m 2 and the pulse length of 2-5 ms in JAERI electron beam irradiation systems (JEBIS). As a result, the weight losses of B 4 C doped CFCs after heating were almost same to those of the non doped CFC up to 5 wt% boron content. For Be, we have carried out our first disruption experiments on S65/C grade Be specimens in the Juelich divertor test facility in hot cells (JUDITH) facility as a frame work of the J-EU collaboration. The heating conditions were heat loads of 1250-5000 MW/m 2 for 2-8 ms, and the heated area was 3 x 3 mm 2 . As a result, the protuberances of the heated area of Be were observed under the lower heat flux. (orig.)

  6. Development and demonstration of a new SANEX Partitioning Process for selective actinide(III)/lanthanide(III) separation using a mixture of CyMe{sub 4}BTBP and TODGA

    Modolo, G.; Wilden, A.; Daniels, H. [Forschungszentrum Juelich GmbH (Germany). Institute for Energy and Climate Research, IEK-6, Nuclear Waste Management and Reactor Safety; Geist, A.; Magnusson, D. [Karlsruher Institut fuer Technologie, Karlsruhe (Germany). Inst. fuer Nukleare Entsorgung; Malmbeck, R. [European Commission, JRC, Karlsruhe (Germany). Inst. for Transuranium Elements (ITU)

    2013-05-01

    Within the framework of the European collaborative project ACSEPT, a new SANEX partitioning process was developed at Forschungszentrum Juelich for the separation of the trivalent minor actinides americium, curium and californium from lanthanide fission products in spent nuclear fuels. The development is based on batch solvent extraction studies, single-centrifugal contactor tests and on flow-sheet design by computer code calculations. The used solvent is composed of 6,6{sup '}-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo-[1,2-4]trizazin-3-yl)-[2,2{sup '}]-bipyridine (CyMe{sub 4}BTBP) and N,N,N{sup '},N{sup '}-tetraoctyldiglycolamide (TODGA) dissolved in n-octanol. A spiked continuous counter-current test was carried out in miniature centrifugal contactors with the aid of a 20-stage flow-sheet consisting of 12 extraction, 4 scrubbing and 4 stripping stages. A product fraction containing more than 99.9% of the trivalent actinides Am(III), Cm(III) and Cf(III) was obtained. High product/feed decontamination factors >1000 were achieved for these actinides. The trivalent lanthanides were directed to the raffinate of the process with the actinide (III) product stream being contaminated with less than 0.5 mass-% in the initial lanthanides. (orig.)

  7. Procedures and results of the probabilistic safety study of the HTR-1160 plant

    Kroeger, W.; Bongartz, R.

    1981-01-01

    A research team of the Institute for Nuclear Safety Research of the Juelich Nuclear Research Center (KFA) and staff members of the Gesellschaft fuer Reaktorsicherheit, sponsored by the Federal Ministry of the Interior, carried out a safety and risk analysis of high temperature reactors. The studies, which included the transfer to German conditions and the modification in some points of methodology of the American AIPA Study, were performed on the German concept of an 1160 MWe HTR with block-type fuel elements. They referred to accidents and possible impacts on the environment, residual risks and measures to reduce them. The study covered a total of approx. 15 groups of initiating events, including potential external impacts. The dominating initiating events are transients in a pressurized reactor. Differences relative to the light water reactor concept arise with respect to releases as a result of accidents and, above all, release times; they are due to different physical characteristics. HTR'S are characterized by thermal inertia and resistance to temperatures. If the results of the study are extended to the HTR line with a pebble bed core currently in the planning phase, the power densities alone, which are considerably lower in some designs, are indicative of an even more effective fission product retention than is already found in the HTR-1160 plant analyzed here. (orig.) [de

  8. Rapid data acquisition from the safety system of the FRJ-2 reactor

    Inhoven, H.

    1980-06-01

    The central department for research reactors (ZFR) of the Juelich Nuclear Research Centre (KFA) is operating the reactors FRJ-1 (MERLIN) and FRJ-2 (DIDO) since 1962. In 1976, a Siemens 330 computer has been put into operation especially for the processing of data from the DIDO reactor, followed by another computer of the same type for the purpose of processing data from the ZFR department in general. The present report is a result of the work investigating 'Data acquisition and data processing in the FRJ-2' and primarily discusses the complex of 'fast analog and binary signals'. The activities in this field of work have been and still are mainly concerned with general problems encountered in adapting a currently 14-year-old reactor system to a digital computer, namely problems such as data decoupling in the safety system of the reactor, data acquisition using the CAMAC system, data transfer via an 'extended branch', data acquisition software as core-resident programs, temporary storage as common data, interpreting software as peripheral - storage - resident programs. (orig./WB) [de

  9. High temperature reactor development in the Netherlands

    Heek, A.I. van

    1996-01-01

    This year, some clear design choices have been made in the WHITE Reactor development programme. The activities will be concentrated at the development of a small size pebble bed HTR for combined heat and power production with a closed cycle gas turbine. Objective of the development is threefold: 1. restoring social support; 2. establishing commercial viability after market introduction; and 3. making the market introduction itself feasible, i.e. limited development and first-of-a-kind costs. This design is based on the peu-a-peu design of KFA Juelich and will be optimized. The computer codes necessary for this are being prepared for this work. The dynamic neutronics code PANTHER is being coupled to the thermal hydraulics code THERMIX-DIREKT. For this reactor type, fuel temperatures are maximal in the scenario of depressurization with recriticality. Even for this scenario, fuel temperatures of the 20MWth PAP-GT do not exceed 1300 deg. C, so there should be room for upscaling for economic reasons. On the other hand, it would be convenient to fuel the reactor batchwise instead of continuously, and the use of thorium could be required. These two features may lead to a larger temperature margin. The optimal design must unite these features in the best acceptable way. To gain expertise in calculations on gas cooled graphite moderate reactors, benchmark calculations are being performed in parallel with international partners. Parallel to this, special expertise is being built up on HTR fuel and HTR reactor vessels. (author). 3 refs

  10. HTR core physics and transient analyses by the Panthermix code system

    Haas, J.B.M. de; Kuijper, J.C.; Oppe, J. [NRG - Fuels, Actinides and Isotopes group, Petten (Netherlands)

    2005-07-01

    At NRG Petten, core physics analyses on High Temperature gas-cooled Reactors (HTRs) are mainly performed by means of the PANTHERMIX code system. Since some years NRG is developing the HTR reactor physics code system WIMS/PANTHERMIX, based on the lattice code WIMS (Serco Assurance, UK), the 3-dimensional steady-state and transient core physics code PANTHER (British Energy, UK) and the 2-dimensional R-Z HTR thermal hydraulics code THERMIX-DIREKT (Research Centre FZJ Juelich, Germany). By means of the WIMS code nuclear data are being generated to suit the PANTHER code's neutronics. At NRG the PANTHER code has been interfaced with THERMIX-DIREKT to form PANTHERMIX, to enable core-follow/fuel management and transient analyses in a consistent manner on pebble bed type HTR systems. Also provisions have been made to simulate the flow of pebbles through the core of a pebble bed HTR, according to a given (R-Z) flow pattern. As examples of the versatility of the PANTHERMIX code system, calculations are presented on the PBMR, the South African pebble bed reactor design, to show the transient capabilities, and on a plutonium burning MEDUL-reactor, to demonstrate the core-follow/fuel management capabilities. For the investigated cases a good agreement is observed with the results of other HTR core physics codes.

  11. HTR core physics and transient analyses by the Panthermix code system

    Haas, J.B.M. de; Kuijper, J.C.; Oppe, J.

    2005-01-01

    At NRG Petten, core physics analyses on High Temperature gas-cooled Reactors (HTRs) are mainly performed by means of the PANTHERMIX code system. Since some years NRG is developing the HTR reactor physics code system WIMS/PANTHERMIX, based on the lattice code WIMS (Serco Assurance, UK), the 3-dimensional steady-state and transient core physics code PANTHER (British Energy, UK) and the 2-dimensional R-Z HTR thermal hydraulics code THERMIX-DIREKT (Research Centre FZJ Juelich, Germany). By means of the WIMS code nuclear data are being generated to suit the PANTHER code's neutronics. At NRG the PANTHER code has been interfaced with THERMIX-DIREKT to form PANTHERMIX, to enable core-follow/fuel management and transient analyses in a consistent manner on pebble bed type HTR systems. Also provisions have been made to simulate the flow of pebbles through the core of a pebble bed HTR, according to a given (R-Z) flow pattern. As examples of the versatility of the PANTHERMIX code system, calculations are presented on the PBMR, the South African pebble bed reactor design, to show the transient capabilities, and on a plutonium burning MEDUL-reactor, to demonstrate the core-follow/fuel management capabilities. For the investigated cases a good agreement is observed with the results of other HTR core physics codes

  12. R and D for back-end options for irradiated research reactor fuel in Germany

    Bruecher, H.; Curtius, H.; Fachinger, J.

    2001-01-01

    Out of 11.5 t of irradiated fuel arising from German research reactors until the end of this decade, 3.9 t are intended to be returned to the USA, and 2.3 t are expected to be recycled for reuse of uranium. The remaining 5.3 t, as well as the fuel irradiated after the year 2010, will have to follow the domestic back-end option of extended dry interim storage in Castor-type casks, followed by disposal in a deep geological repository. R and D is going on in the Research Centre Juelich to investigate the long-term behaviour of U-Al based fuel in a salt repository. First results from leaching experiments show I) a fast dissolution of the fuel with mobilization of its radionuclide inventory, and 2) the following formation of amorphous Al-Mg-hydroxide phases. Long-lived actinides from the fuel were shown to be fixed in these phases and hence immobilized. Future R and D will be to investigate the nature and stability of these phases for long-term safety assessments. Investigations will have to be extended to cover alternative disposal sites (granite clay) as well as different (e.g. silicon based) fuels. (author)

  13. Quality Control Samples for the Radiological Determination of Tritium in Urine Samples

    Ost'pezuk, P.; Froning, M.; Laumen, S.; Richert, I.; Hill, P.

    2004-01-01

    The radioactive decay product of tritium is a low energy beta that cannot penetrate the outer dead layer of human skin. Therefore , the main hazard associated with tritium is internal exposure. In addition, due to the relatively long half life and short biological half life, tritium must be ingested in large amounts to pose a significant health risk. On the other hand, the internal exposure should be kept as low as practical. For incorporation monitoring of professional radiation workers the quality control is of utmost importance. In the Research Centre Juelich GmbH (FZJ) a considerable fraction of monitoring by excretion analysis relates to the isotope Tritium. Usually an aliquot of an urine sample is mixed with a liquid scintillator and measured in a liquid scintillation counter. Quality control samples in the form of three kind of internal reference samples (blank, reference samples with low activity and reference sample with elevated activity) were prepared from a mixed, Tritium (free) urine samples. 1 ml of these samples were pipetted into a liquid scintillation vial. In the part of theses vials a known amounts of Tritium were added. All these samples were stored at 20 degrees. Based on long term use of all these reference samples it was possible to construct appropriate control charts with the upper and lower alarm limits. Daily use of these reference samples decrease significantly the risk for false results in original urine with no significant increase of the determination time. (Author) 2 refs

  14. A new instrumental set-up for polarized neutron scattering experiments

    Schmidt, Wolfgang; Ohl, Michael

    2005-01-01

    Neutron scattering with polarization analysis is a powerful tool to determine magnetic structures and excitations. A common setup is to mount the sample at the center of a Helmholtz-type coil which can provide a magnetic field of any direction at the sample position and also a guide field along the neutron flight paths around the sample. Recent experiments showed quite a high demand for measurements at low momentum transfers. For the corresponding low scattering angles air scattering gives rise to a very large background. For this reason we have extended the standard setup to a combination of a large vacuum tank surrounded by electrical coils. The vacuum tank eliminates the air scattering and we can use the polarization analysis down to the lowest accessible momentum transfers. The coils themselves also show some new features: In contrary to the classic (symmetric) coil distribution we use an asymmetric setup which gives the advantage of a larger scattering window. Due to a more sophisticated current distribution this modified coil arrangement needs not to be rotated for different scattering conditions. The whole set-up will soon be available at IN12, a cold neutrons three-axis spectrometer operated by FZ Juelich in collaboration with CEA Grenoble as a CRG-B instrument at the Institut Laue Langevin in Grenoble

  15. Synergistic methane formation on pyrolytic graphite due to combined H+ ion and H0 atom impact

    Haasz, A.A.; Davis, J.W.; Auciello, O.; Strangeby, P.C.; Vietzke, E.; Flaskamp, K.; Philipps, V.

    1986-06-01

    Exposure of graphite to multispecies hydrogenic impact, as is the case in tokamaks, could lead to synergistic mechanisms resulting in an enhancement of methane formation, and consequently in increased carbon erosion. We present results obtained in controlled experiments in our laboratories in Toronto and Juelich for the synergistic methane production due to combined sub-eV H 0 atoms and energetic H + ion impact on pyrolytic graphite. Flux densities were 10 14 -2x10 16 H 0 /cm 2 s for the sub-eV H 0 atoms and 6x10 12 -5x10 15 H + /cm 2 for H + ions of 300 eV to 2.5 keV energy. Synergistic factors (defined as the ratio of methane formation rate due to combined H 0 and H + fluxes to the sum of the formation rates due to separate species impact) ranged from about 1.5-15 for the experimental parameters used. In addition, a spectrum of formed hydrocarbons in the synergistic reaction of H + and H 0 on graphite is presented

  16. ASPUN: design for an Argonne super-intense pulsed neutron source

    Khoe, T.K.; Kustom, R.L.

    1983-01-01

    Argonne pioneered the pulsed spallation neutron source with the ZING-P and IPNS-I concepts. IPNS-I is now a reliable and actively used source for pulsed spallation neutrons. The accelerator is a 500-MeV, 8 to 9 μa, 30-Hz rapid-cycling proton synchrotron. Other proton spallation sources are now in operation or in construction. These include KENS-I at the National Laboratory for High Energy Physics in Japan, the WNR/PSR at Los Alamos National Laboratory in the USA, and the SNS at the Rutherford Appleton Laboratory in England. Newer and bolder concepts are being developed for more-intense pulsed spallation neutron sources. These include SNQ at the KFA Laboratory in Juelich, Germany, ASTOR at the Swiss Institute for Nuclear Physics in Switzerland, and ASPUN, the Argonne concept. ASPUN is based on the Fixed-Field Alternating Gradient concept. The design goal is to provide a time-averaged beam of 3.5 ma at 1100 MeV on a spallation target in intense bursts, 100 to 200 nanoseconds long, at a repetition rate of no more than 60 to 85 Hz

  17. Nuclear and atomic data activities in Malaysia

    Ahmad Suhaimi; Gui Ah Auu.

    1996-01-01

    Nuclear and atomic data measurements and calculations in Malaysia are mostly done at the National University of Malaysia (UKM) and Malaysian Institute for Nuclear Technology Research (MINT). At UKM, (n,t) reactions for 6 Li, 10 B and reactor structural materials have been investigated using liquid scintillation counting and gas phase β - anticoincidence counting. Tritium productions via ternary fission in 235 U and 232 Th are measured using vacuum extraction and β - counting of accumulated tritium. In addition, γ-ray attenuation coefficients on cooking oil, petroleum products, building materials, natural rubber and tropical woods have also been measured. Calculations to determine μ-value according to Hubbel method are initiated. Some collaborative works between UKM and Juelich Research Centre of Germany have been completed while others are in progress namely; (n,t) reactions study on 9 Be, 10 B, 14 N and also measurement of excitation functions and isomer ratios of fast neutron induced reactions on Zn, Ga and Ge. At MINT, the 1-D diffusion code TRIGAM and the 2-D EXTERMINATOR code are used for neutronic analyses of TRIGA Reactor. The radiation shielding calculation have been carried out by using ANISN, a 1-D discrete ordinates code. Some preliminary calculations for the fuel transfer cask using ORIGEN2 and MERCURE-4 have been performed. Response functions for neutrons and the associated secondary photons for neutron skyshine analyses have been generated using the MCNP code. (author)

  18. Stand-alone power systems for the future: Optimal design, operation and control of solar-hydrogen energy systems

    Ulleberg, Oeystein

    1998-12-31

    This thesis gives a systematic review of the fundamentals of energy systems, the governing physical and chemical laws related to energy, inherent characteristics of energy system, and the availability of the earth`s energy. It shows clearly why solar-hydrogen systems are one of the most viable options for the future. The main subject discussed is the modelling of SAPS (Stand-Alone Power Systems), with focus on photovoltaic-hydrogen energy systems. Simulation models for a transient simulation program are developed for PV-H{sub 2} components, including models for photovoltaics, water electrolysis, hydrogen storage, fuel cells, and secondary batteries. A PV-H{sub 2} demonstration plant in Juelich, Germany, is studied as a reference plant and the models validated against data from this plant. Most of the models developed were found to be sufficiently accurate to perform short-term system simulations, while all were more than accurate enough to perform long-term simulations. Finally, the verified simulation models are used to find the optimal operation and control strategies of an existing PV-H{sub 2} system. The main conclusion is that the simulation methods can be successfully used to find optimal operation and control strategies for a system with fixed design, and similar methods could be used to find alternative system designs. 148 refs., 78 figs., 31 tabs.

  19. Numerical investigation of the 3-dimensional steady-state temperature- and flow distribution in the core of a pebble bed high temperature reactor

    Verfondern, K.

    1983-01-01

    This work presents a computer model determining the steady-state temperature- and flow field in 3 dimensions in the core of a pebble bed high temperature reactor. The numerical sprinkler method, basind on the Thermix-model, allows to describe the thermo-hydraulics of a non-rotational-symmetric core-geometry. The AVR-reactor in Juelich, in operation since 1967, represents a suitable investigation-object for the computer model of Thermix-3D. It is in a 3D-mesh-structure to reproduce very precisely the so called ''graphite noses'', in which the shut-down rods are conducted as well as the filling cones in the inner and outer area. The results of the final calculation of the normal operation condition for the AVR-reactor unambiguously show, that within the core reproduced in 3 dimensions there are evident deviations in the flow profile and in the temperatures of the cooling gas in contrast to a 2D-handling. (orig.) [de

  20. Radioactive waste products 2002 (RADWAP 2002). Proceedings

    Odoj, R.; Baier, J.; Brennecke, P.; Kuehn, K.

    2003-01-01

    The 4 th International Seminar on Radioactive Waste Products was organised by the Forschungszentrum Juelich in co-operation with the Bundesamt fuer Strahlenschutz and the European Commission. On behalf of the Bundesamt, I would like to welcome all participants of this scientific-technical meeting. I very much appreciate the participation not only of numerous German scientists, engineers and technicians as well as governmental and industrial representatives, but would particularly express my gratitude for the participation of many colleagues from abroad. Radioactive waste management and disposal is a worldwide issue and international co-operation to support national programmes is therefore much appreciated. The international organisations provide, among other things, guidance to member countries on safe, economic and environmentally acceptable solutions for radioactive waste disposal. On a national basis respective programmes are developed, modified or successfully realized. Nevertheless, the challenge of radioactive waste management and disposal is no longer a scientific and technical exclusivity. The importance of ethical and social aspects, the dialogue with the public and transparency in decision-making processes increase more and more. Thus, when addressing safety-related key questions one needs to be as open as possible on scientific-technical aspects and to consider the involvement of the public requiring a clear, open-minded and transparent communication. (orig.)

  1. UFO--a multi-analyser option for IN12

    Schmidt, Wolfgang; Rheinstaedter, Maikel C.; Raymond, Stephane; Ohl, Michael

    2004-07-15

    The IN12 instrument is operated by FZ Juelich in collaboration with CEA Grenoble as a CRG-B instrument at the Institut Laue Langevin in Grenoble. As a three-axis spectrometer for cold neutrons it is dedicated for high-resolution studies of low-energy excitations. In the past years the instrument has been continuously improved and it has demonstrated its excellent performance for neutron scattering research. To meet further challenges as a state-of-the-art instrument in the next funding period we will propose to upgrade IN12 with a multi-analyser option similar to planned or existing RITA-type instruments. IN12 will then be optionally equipped with an array of individual analyser blades which can be positioned separately in order to map the scattered beam on a user-chosen path in (Q,{omega})-space. We refer to this set-up as IN12-UFO (universal focusing option). Both, the feasibility and the scientific case are currently being studied. On the conference we will show details of the planned instrumental set-up and demonstrate its flexibility and multiplex advantages for specific physical applications.

  2. Electromagnetic Transition Form Factor of the η meson with WASA-at-COSY

    Goswami, A.

    2016-11-01

    In this work we present a study of the Dalitz decay η → γe+e-. The aim of this work is to measure the transition form factor of the η meson. The transition form factor of the η meson describes the electromagnetic structure of the meson. The study of the Dalitz decay helps to calculate the transition form factor of the η meson. When a particle is point-like it's decay rate can be calculated within QED. However, the complex structure of the meson modifies its decay rate. The transition form factor is determined by comparing the lepton-antilepton invariant mass distribution with QED. For this study data on proton-proton reaction at a beam energy of 1.4 GeV has been collected with WASA-at-COSY detector at Forschungszentrum Juelich, Germany. In the higher invariant mass region recent theoretical calculations slightly deviate from the fit to the data. We expect better results in the higher invariant mass region than previous measurements. The preliminary results of the analysis will be presented.

  3. Electromagnetic Transition Form Factor of the η meson with WASA-at-COSY

    Goswami A.

    2016-01-01

    Full Text Available In this work we present a study of the Dalitz decay η → γe+e−. The aim of this work is to measure the transition form factor of the η meson. The transition form factor of the η meson describes the electromagnetic structure of the meson. The study of the Dalitz decay helps to calculate the transition form factor of the η meson. When a particle is point-like it’s decay rate can be calculated within QED. However, the complex structure of the meson modifies its decay rate. The transition form factor is determined by comparing the lepton-antilepton invariant mass distribution with QED. For this study data on proton-proton reaction at a beam energy of 1.4 GeV has been collected with WASA-at-COSY detector at Forschungszentrum Juelich, Germany. In the higher invariant mass region recent theoretical calculations slightly deviate from the fit to the data. We expect better results in the higher invariant mass region than previous measurements. The preliminary results of the analysis will be presented.

  4. Tracking studies towards EDM measurements at COSY

    Rosenthal, Marcel [Institut fuer Kernphysik, Forschungszentrum Juelich, Juelich (Germany); Physikalisches Institut III B, RWTH Aachen, Aachen (Germany)

    2015-07-01

    Electric Dipole Moments (EDMs) violate parity and time reversal symmetries. Therefore, direct measurements of charged particles' EDMs would be a strong hint for physics beyond the Standard Model. The JEDI collaboration investigates the feasibility of such measurements for protons, deuterons, and Helium3 in storage rings. Precursor studies are performed at the existing conventional Cooler Synchtrotron COSY in Juelich. A measurement time of about 1000 seconds is proposed. This requires a setup providing a long spin coherence time in the plane perpendicular to the invariant spin axis. During the measurement run, it is planned to use radiofrequency devices to create an EDM related signal. The contribution of imperfections, which could mimic such a signal, is explored in beam and spin dynamics simulations. The software framework COSY INFINITY is used to calculate transfer maps of the magnets and performs long term tracking studies. Recent efforts extend the code by the EDM contribution to spin motion and by the calculation of timedependent maps required for tracking in nonstatic fields. These enhancements are benchmarked with analytical predictions and with test measurements at COSY.

  5. Hyperon interactions in nuclear matter

    Dhar, Madhumita; Lenske, Horst [Institut fuer Theoretische Physik, Universitaet Giessen (Germany)

    2014-07-01

    Baryon-baryon interactions within the SU(3)-octet are investigated in free space and nuclear matter. A meson exchange model is used for determining the interaction. The Bethe-Salpeter equations are solved in a 3-D reduction scheme. In-medium effects have been incorporated by including a two particle Pauli projection operator in the scattering equation. The coupling of the various channels of total strangeness S=-1,-2 and conserved total charge is studied in detail. Calculations and the corresponding results are compared for using the isospin and the particle basis. Matrix elements are compared in detail, in particular discussing mixing effects of different hyperon channels. Special attention is paid to the physical thresholds. The density dependence of interaction is clearly seen in the variation of the in-medium low-energy parameters. The approach is compared to descriptions derived from chiral-EFT and other meson-exchange models e.g. the Nijmegen and the Juelich model.

  6. Test of time-reversal invariance at COSY

    Valdau, Yury [Helmholtz Institut fuer Strahlen- und Kernphysik, Bonn Univ. (Germany); National Research Center ' ' Kurchatov Institute' ' Petersburg Nuclear Physics Institute B.P. Konstantinov, Gatchina (Russian Federation); Eversheim, Dieter [Helmholtz Institut fuer Strahlen- und Kernphysik, Bonn Univ. (Germany); Lorentz, Bernd [Forschungszentrum Juelich, Institute fuer Kernphysik (Germany)

    2016-07-01

    The experiment to test the Time Reversal Invariance at Cosy (TRIC) is under the preparation by the PAX collaboration. It is planned to improve present limit on the T-odd P-even interaction by at least one order of magnitude using a unique genuine null observable available in double polarized proton-deuteron scattering. The TRIC experiment is planned as a transmission experiment using a tensor polarized deuterium target placed at the internal target place of the Cooler-Synchrotron COSY-Juelich. Total double polarized cross section will be measured observing a beam current change due to the interaction of a polarized proton beam with an internal tensor polarized deuterium target from the PAX atomic beam source. Hence, in this experiment COSY will be used as an accelerator, detector and ideal zero degree spectrometer. In addition to the high intensity polarized proton beam and high density polarized deuterium target, a new high precision beam current measurement system will be prepared for the TRIC experiment. In this report status of all the activities of PAX collaboration towards realization of the TRIC experiment will be presented.

  7. Thematic outlook: the technical outlook for the fuel cell research network (PACO). December 22, 2003 update no. 19; Veille thematique. La veille technique pour le reseau PACO. Actualisation du 22 decembre 2003, no. 19

    NONE

    2003-07-01

    Summaries of several recent articles and patents are gathered here. They deal with fuel cells, the means of transport, the hydrogen production and with the different new other energies. Their different titles are given below : 1)gas turbine/fuel cell arrangement 2)design and fabrication of a SOFC by CERAMIC FUEL CELLS 3)a 'microbial' fuel cell able of converting glucose in electricity with high yields and velocity 4)a hybrid system: combined cycle gas turbine - multi-stage SOFC 5)a SOFC as auxiliary generator of electricity in an aircraft 6)recent development results of fuel in the Juelich research center 7)state of development of the SOFC at Haldor Topsoe/Risoe 8)a cost/advantage analysis of 'clean cars': methodology and applications to the electric cars 9)the generation of current and heat in a aerostat 10)hydrogen free from CO, produced from bio-ethanol steam reforming on cobalt catalysts supported on ZnO. Effect of the metallic precursor 11)device and method based on the cyclic auto-thermal reforming 12)the ammonia, source of hydrogen for a hybrid system: alkaline fuel/battery 13)effect of the Nafion on the activity of Pt-Ru electrocatalysts for the methanol electro-oxidation 14)'VISION 21': an integration of systems based on coal. The references of these articles and patents are detailed. (O.M.)

  8. Results of the first tests measurements using the prototype trigger-less data acquisition for the anti PANDA experiment

    Wagner, Milan; Gessler, Thomas; Kuehn, Wolfgang; Lange, Soeren; Spruck, Bjoern; Werner, Marcel [JLU Giessen (Germany); Collaboration: PANDA-Collaboration

    2015-07-01

    The anti PANDA detector will be a located at the high energy storage ring (HESR), at the facility for anti protons and ion research (FAIR) in Darmstadt, Germany. It will operate with a very high average interaction rate of about 20 MHz, in a free streaming mode without hardware trigger. Instead of triggering, data filtering will be performed by complete online event reconstruction with a highly parallelized farm of FPGAs as first level and on a farm of GPUs or PCs as a second level. The requirement is a background reduction by a factor of >1000. Parts of the anti PANDA detector will be pre-assembled and tested at the Forschungszentrum Juelich, before being transported to GSI at a later stage. A prototype trigger-less data acquisition (PTDAQ) will be used during this phase. The main component of the PTDAQ is the Compute Nodes (CN), a xTCA-compliant board based on a Virtex-5 FX70T FPGA, with a μTCA-formfactor. Synchronization is done via a Synchronization Of Data Acquisition (SODA) source. Parts of the functionality were tested in a setup using a 210 MeV electrons beam with a rate of 1 MHz at the Mainz Microtron. In this contribution, we present the first results of test measurements using the PTDAQ system.

  9. Studies of rotational structures in the neutron-rich niobium isotopes 101-103

    Paffrath, U.

    1989-08-01

    The aim of this thesis was to study rotational structures in the low-lying levels of the niobium isotopes 101, 102, and 103. This was performed at the recoil separator JOSEF of the Nuclear Research Facility Juelich by studies of the β-decays of the zirconium isotopes 101-103 into their niobium daughters. By γ-γ respectively X-γ coincidence measurements the already existing term schemes of the niobium isotopes should be verified respectively extended and by γ-γ angular-correlation measurements the rotational structures should be studied. The term schemes of the niobium isotopes 101 and 102 could be confirmed in the framework of the performed experiments while the level scheme of the 103 Nb could be essentially extended. From the X-γ coincidence measurement for a plurality of γ transitions the conversion coefficients and by this the dominant multipolarities could be determined. With these conversion coefficients then also the mixing parameters were calculated. These data together with the results from the γ-γ angular-correlation experiments led to a fixing concerning the spins and parities at a series of levels in all three niobium isotopes. (orig./HSI) [de

  10. Investigating spatial self-shielding and temperature effects for homogeneous and double heterogeneous pebble models with MCNP

    Li, J.; Nuenighoff; Pohl, C.; Allelein, H.J.

    2010-01-01

    The gas-cooled, high temperature reactor (HTR) represents a valuable option for the future development of nuclear technology, because of its excellent safety features. One main safety feature is the negative temperature coefficient which is due to the Doppler broadening of the (n,y) resonance absorption cross section. A second important effect is the spatial self-shielding due to the double heterogeneous geometry of a pebble bed reactor. At FZ-Juelich two reactor analysis codes have been developed: VSOP for core design and MGT for transient analysis. Currently an update of the nuclear cross section libraries to ENDF/B-VII.0 of both codes takes place. In order to take the temperature dependency as well as the spatial self-shielding into account the absorption cross sections σ (n,y) for the resonance absorbers like 232 Th and 238 U have to be provided as function of incident neutron energy, temperature and nuclide concentration. There are two reasons for choosing the Monte-Carlo approach to calculate group wise cross sections. First, the former applied ZUT-DGL code to generate the resonance cross section tables for MGT is so far not able to handle the new resonance description based on Reich-Moore instead of Single-level Breit-Wigner. Second, the rising interest in PuO 2 fuel motivated an investigation on the generation of group wise cross sections describing thermal resonances of 240 Pu and 242 Pu. (orig.)

  11. Development of fuel cell systems for aircraft applications based on synthetic fuels

    Pasel, J.; Samsun, R.C.; Doell, C.; Peters, R.; Stolten, D. [Forschungszentrum Juelich GmbH (Germany)

    2010-07-01

    At present, in the aviation sector considerable scientific project work deals with the development of fuel cell systems based on synthetic fuels to be integrated in future aircraft. The benefits of fuel cell systems in aircraft are various. They offer the possibility to simplify the aircraft layout. Important systems, i.e. the gas turbine powered auxiliary power unit (APU) for electricity supply, the fuel tank inserting system and the water tank, can be substituted by one single system, the fuel cell system. Additionally, the energy demand for ice protection can be covered assisted by fuel cell systems. These measures reduce the consumption of jet fuel, increase aircraft efficiency and allow the operation at low emissions. Additionally, the costs for aircraft related investments, for aircraft maintenance and operation can be reduced. On the background of regular discussions about environmental concerns (global warming) of kerosene Jet A-1 and its availability, which might be restricted in a few years, the aircraft industry is keen to employ synthetic, sulfur-free fuels such as Fischer-Tropsch fuels. These comprise Bio-To-Liquid and Gas-To-Liquid fuels. Within this field of research the Institute of Energy Research (IEF-3) in Juelich develops complete and compact fuel cell systems based on the autothermal reforming of these kinds of fuels in cooperation with industry. This paper reports about this work. (orig.)

  12. Measurement of the absolute differential cross section of proton-proton elastic scattering at small angles, using ANKE-COSY facility

    Bagdasarian, Zara [Forschungszentrum Juelich (Germany)

    2016-07-01

    The most accepted approach to describe nucleon-nucleon (NN) interaction is the partial wave analysis (PWA). The goal of many experiments held at COSY-Juelich has been to provide PWA with valuable precision measurements at different energies aiming to cover the full angular range. This contribution reports on the differential cross section for proton-proton elastic scattering that has been measured at a beam energy of 1.0 GeV and in 200 MeV steps from 1.6 to 2.8 GeV at centre-of-mass angles between about 10 and 30 degrees. The ANKE collaboration and the COSY machine crew have jointly developed a very accurate method for determining the absolute luminosity in an experiment at an internal target position. The technique relies on measuring the energy losses due to the electromagnetic interactions of the beam as it passes repeatedly through the thin target and measuring the shift of the revolution frequency by studying the Schottky spectrum. This powerful technique allows one to measure the absolute differential cross section for elastic pp scattering with the accuracy of typically 3%. After extrapolating the differential cross sections to the forward direction, the results are broadly compatible with the predictions of forward dispersion relations. Finally, it is shown that the data have a significant impact on the partial wave analysis.

  13. Nucleon-nucleon scattering studies at small angles at COSY-ANKE

    Bagdasarian, Zara [Forschungszentrum Juelich, Juelich (Germany); Tbilisi State University, Tbilisi (Georgia); Collaboration: ANKE-Collaboration

    2015-07-01

    The most accepted approach to describe nucleon-nucleon (NN) interaction is the partial wave analysis (PWA). The SAID database and analysis program comprise various experimental observables at different energies over the full angular range and express them in the partial waves. The goal of the experiments held at COSY-Juelich is to provide SAID with new valuable measurements. Scattering data was taken at small angles for six beam energies between 0.8 and 2.4 GeV with polarized proton beam incident on both proton and deuteron unpolarized targets using the ANKE spectrometer. First, the results of the proton-proton (pp) scattering analyzing power and cross section are presented. While pp data closes a very important gap at small angles in the database, proton-neutron (pn) data is a crucial contribution to the almost non-explored pn database above 800 MeV. Therefore, the talk will mainly concentrate on the proton-deuteron (pd) scattering studies, which includes the overview of the older COSY experiments with polarized deuteron beam, and the abovementioned new experiment with polarized proton beam and unpolarized deuteron target. The presentation will show the most recent results of the analyzing powers of pd elastic and pn scattering.

  14. Results from plate-out investigations

    Iniotakis, N.; Malinowski, J.; Gottaut, H.; Muenchow, K.

    1981-01-01

    The fission- and activation products in the primary circuits of HTR's belong to the essential factors for the security of the plant during the normal work and in the case of accident. The deposition of these products on the components of primary circuits, specially their diffusion in the wall material, can cause a more or less intense contamination of the components and play a decisive role in the solving of such problems as inspection, servicing and repair. The knowledge of fission product [FP] behaviour in the primary circuit of a HTR is an essential requirement for the estimations of the availability of the reactor plant in normal operation, of the hazards to personnel during inspection and repair and of the potential danger to the environment from severe accidents. In the Institute for Reactor Components of the KFA Juelich, much theoretical and experimental work was done /1 bis 10/, with the aim to clarify this complex problem. In this paper we would like to report some essential results of these investigations with special attention to the possibility of extrapolation of these results for long periods of time

  15. Microspheres Prepared by Internal Gelation for Actinide Co-Conversion - Influence of Organic Precursors in Initial Solution on Structure during Thermal Treatment

    Benay, G.; Modolo, G.; Robisson, A.C.; Grandjean, S.

    2008-01-01

    The fabrication of fuels or targets for transmutation of minor actinides requires a dust-free process. Such a requirement can be fulfilled by sol-gel methods, which allow the production of microsphere precursors. Internal gelation, one of these methods, was studied at Cea Marcoule and FZ (Forschungszentrum Juelich Germany). A study of the parameters involved in internal gelation (essentially the quantity of organic additives urea and hexa-methylene-tetramine (HMTA) present in the initial solution) was performed. Afterwards, the effects of these parameters on the structural evolution of the microspheres during thermal treatment were studied. It was observed that the structure and density of the microspheres are heavily dependant of the quantity of organic precursors present in the initial solution. Urea in particular has been found to bring porosity to the material, in addition to its catalytic effect on HMTA decomposition. The elimination of these organic compounds is however a major issue which causes the formation of cracks on the microspheres if no optimization is performed. (authors)

  16. Trace Analysis of Irradiated Granite Samples from Hiroshima by Laser Ablation Inductively Coupled Plasma Mass Spectrometry

    Amr, M.A.; Helal, N.F.; Zahran, N.F.; Becker, J.S.; Pickhardt, C.; Dietze, H.J.

    1999-01-01

    Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) is widely accepted as a rapid and sensitive technique for trace elemental analysis of solid materials and for local analysis of inhomogeneous materials (such as geological samples). Due to its direct solid sample analysis capability, LA-ICP-MS (using a quadrupole based ICP-MS and at the Research Center Juelich developed laser ablation system: Nd-YAG-laser, 226 nm, 10 Hz and 5 ns) is applied for the analysis of geological (granite) samples from Hiroshima. In order to prepare homogeneous targets, these samples were melted together with a lithium-borate mixture in a muffle furnace at 1050 degree c. Furthermore, for investigating of matrix effects the powder of these samples is mixed with graphite and pressed as targets for laser ablation. The quantification of the analysis results was carried out using granite (GM) as standard reference material. The relative sensitivity coefficients (RSCs) for most elements, which were determined for correction of the measured values, varied between 0.3 and 3

  17. Development of a portable, automated system for the separation of radionuclides by column chromatography

    Schumacher, C.; Burow, M.; Flucht, R.; Hill, P.; Zoriy, M.V.

    2012-01-01

    The determination of the chemical recovery is one of the most important challenges in the radiochemical analysis. Small changes at the pH-value and temperature changes lead to uncontrollable conditions in process. To improve the reproducibility of the chemical determination a separate separating column system (TSM) was developed at the analytic laboratory at JUeLICH. Using the TSM it is possible to separate nuclides by applying variable eluents and ion exchangers also in samples with a very high salt content like urine. Up to now the methods are developed for the elements U, Am and Pu. The automation provides a bigger number of analysed samples per working day and a remarkable economy of time. Due to the increasing of the sample volume it is possible to improve the detection limit of overall analytical procedure (time needed for separation increases). Experimental parameters like rate of flow and chemical recovery were tested. In this progress it was tried to develop a dense portable system which is easy to use. This new TSM allows a realisation of various separating processes by the easy handling via laptop. (orig.)

  18. Search for a permanent Xe-electric dipole moment

    Zimmer, Stefan [Institut fuer Physik, Universitaet Mainz (Germany); Collaboration: MIXed-Collaboration

    2016-07-01

    A permanent electric dipole moment (EDM) of the isotope {sup 129}Xe would imply a breakdown of both parity P and time-reversal symmetry T and, through the CPT theorem, a breakdown in CP, the combined symmetries of charge conjugation C and parity P. Our goal is to improve the present experimental limit (d{sub Xe}<3.10{sup -27} ecm) by about three orders of magnitude. The most precise EDM limit on diamagnetic atoms was measured on {sup 199}Hg (d{sub Hg}<3.1.10{sup -29} ecm). To get more stringent limits, we perform a {sup 3}He/{sup 129}Xe clock comparison experiment with the detection of free spin precession of gaseous, nuclear polarized {sup 3}He or {sup 129}Xe samples with a SQUID as magnetic flux detector. The precession of co-located {sup 3}He/{sup 129}Xe nuclear spins are used as an ultra-sensitive probe for non-magnetic spin interactions of type δν∝ d{sub Xe}.E. With our experimental setup at the research center Juelich we are able to observe spin coherence times T{sub 2}{sup *} of several hours for both species. We report on first experimental results achieved within the MIXed-collaboration.

  19. Measurement of permanent electric dipole moments of charged hadrons in storage rings

    Pretz, Joerg, E-mail: pretz@physik.rwth-aachen.de [III. Physikalisches Institut (Germany); Collaboration: JEDI Collaboration

    2013-03-15

    Permanent Electric Dipole Moments (EDMs) of elementary particles violate two fundamental symmetries: time reversal invariance ( T ) and parity ( P ). Assuming the CPT theorem this implies CP violation. The CP violation of the Standard Model is orders of magnitude too small to be observed experimentally in EDMs in the foreseeable future. It is also way too small to explain the asymmetry in abundance of matter and anti-matter in our universe. Hence, other mechanisms of CP violation outside the realm of the Standard Model are searched for and could result in measurable EDMs. Up to now most of the EDM measurements were done with neutral particles. With new techniques it is now possible to perform dedicated EDM experiments with charged hadrons at storage rings where polarized particles are exposed to an electric field. If an EDM exists the spin vector will experience a torque resulting in change of the original spin direction which can be determined with the help of a polarimeter. Although the principle of the measurement is simple, the smallness of the expected effect makes this a challenging experiment requiring new developments in various experimental areas. Complementary efforts to measure EDMs of proton, deuteron and light nuclei are pursued at Brookhaven National Laboratory and at Forschungszentrum Juelich with an ultimate goal to reach a sensitivity of 10{sup - 29}e{center_dot}cm.

  20. Simulation of spin dynamics to measure electric dipole moments in storage rings

    Rosenthal, Marcel; Lehrach, Andreas [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Collaboration: JEDI-Collaboration

    2013-07-01

    CP violation in the baryon sector, which is predicted by the Standard Model of Particle Physics, is too small to explain the matter and antimatter asymmetry in our universe. Permanent Electric Dipole Moments (EDMs) violate both P and T symmetries and are therefore, through the CPT theorem, also CP violating. No direct EDM measurements for protons, deuterons and light nuclei have been performed up to now. The JEDI collaboration at Forschungszentrum Juelich (FZJ) and the BNL-EDM collaboration at Brookhaven National Laboratory (BNL) pursue the goal to measure the EDMs of these particles in dedicated storage rings. Therefore different approaches are studied to reach an ultimate sensitivity of 10{sup -29} e.cm. A first direct measurement of the proton and deuteron EDM at a sensitivity level of 10{sup -24} e.cm will be performed in the existing conventional storage ring at FZJ, the Cooler Synchrotron COSY. Particle tracking simulations to explore the motion-correlated spin dynamics are a crucial part of feasibility studies of the planned storage ring EDM experiments. In a first step, a benchmarking of simulation codes with measurements at the Cooler Synchrotron COSY is performed.

  1. CAS CERN accelerator school: 5. general accelerator physics course. Vol. 2. Proceedings

    Turner, S.

    1994-01-01

    The fifth CERN Accelerator School (CAS) basic course on General Accelerator Physics was given at the University of Jyvaeskylae, Finland, from 7 to 18 September 1992. Its syllabus was based on the previous similar courses held at Gif-sur-Yvette in 1984, Aarhus 1986, Salamanca 1988 and Juelich 1990, and whose proceedings were published as CERN Reports 85-19, 87-10, 89-05 and 91-04, respectively. However, certain topics were treated in a different way, improved or extended, while new subjects were introduced. As far as the proceedings of this school are concerned the opportunity was taken not only to include the lectures presented but also to select and revise the most appropriate chapters from the previous similar schools. In this way the present volumes constitute a rather complete introduction to all aspects of the design and construction of particle accelerators, including optics, emittance, luminosity, longitudinal and transverse beam dynamics, insertions, chromaticity, transfer lines, resonances, accelerating structures, tune shifts, coasting beams, lifetime, synchrotron radiation, radiation damping, beam-beam effects, diagnostics, cooling, ion and positron sources, RF and vacuum systems, injection and extraction, conventional, permanent and superconducting magnets, cyclotrons, RF linear accelerators, microtrons, as well as applications of particle accelerators (including therapy) and the history of accelerators. See hints under the relevant topics. (orig.)

  2. Experience in transfer of nuclear technology

    Beckurts, K.H.

    1977-01-01

    Nuclear energy development in the Federal Republic of Germany was initiated in 1955. In spite of this late start, the country now has a broad potential in all branches of peaceful nuclear technology. Turkey nuclear power plants are erected by German industry, and the country has the basic technology at its disposal for all stages of the nuclear fuel cycle. In the areas of uranium enrichment and reprocessing, multilateral joint ventures with European countries have been formed. The country also has an active development program for advanced reactors. In general areas of technology transfer and development aid, in the nuclear field, there are interrelated activities of both government and industry. The government has concluded bilateral agreements with a number of countires e.g. Argentina, Brazil, India, Iran and Pakistan, covering the general field of nuclear science; in the framework of these agreements, which are being carried out mainly by the nuclear research centers at Juelich and Karlsruhe, active cooperation in research, development, education, and training are being pursued. The nonproliferation of nuclear weapons is a major objective of the Federal government which strongly affects its policies for international nuclear trade. The paper describes the nuclear technology potential available in the Federal Republic of Germany and reviews experience gathered in cooperation with developing countries. Future policies for nuclear technology transfer are discussed with special reference to the role of national R and D laboratories

  3. Automated rapid method for the determination of Ni-63 in deconstruction of nuclear facilities- and environmental samples; Automatisiertes Schnellverfahren zur Bestimmung von Ni-63 in Rueckbau- und Umweltproben

    Bach, M.; Flucht, R.; Burow, M.; Zoriy, M.V. [Forschungszentrum Juelich GmbH, Juelich (Germany)

    2012-07-01

    Because of the increasing demand on the deconstruction of nuclear facilities in the last few years, a rapid method for the determination of Ni-63 in environmental samples is required. At Juelich, Division of Safety and Radiation Protection we have established a routine method, based on the determination of Ni-63 in the environmental samples using extraction chromatography separation from 2000[1] and optimize the sample preparation. Samples of different matrices were prepared by wet chemical methods for the extraction chromatography separation. For the separation the samples were introduced manually via a peristaltic pump or by using developed automated separation system equipped with the extraction chromatography column of Ni-Resin. Nickel[2] forms a Dimethylglyoximkomplex (DMG) and can be separated. The activity of the Ni-63 then were measured bei means of liquid scintillation counter (LSC), the recovery was determined using MC-ICP-MS. The yields of the Ni-carrier for the develped procure was higher than 90% with the accuracy below 10%. The developed method allows the relatively simple and fast determination of Ni-63 in environmental samples with a detection limit of 0.1 Bq/l. (orig.)

  4. Nuclear energy research in Germany 2009

    2010-01-01

    Research and development (R and D) in the fields of nuclear reactor safety and safety of nuclear waste and spent fuel management in Germany are carried out at research centers and, in addition, some 32 universities. In addition, industrial research is conducted by plant vendors, and research in plant and operational safety of power plants in operation is organized by operators and by organizations of technical and scientific research and expert consultant organizations. This summary report presents nuclear energy research conducted at research centers and universities in Germany in 2009, including examples of research projects and descriptions of the situation of research and teaching. These are the organizations covered: - Hermann von Helmholtz Association of German Research Centers, - Karlsruhe Institute of Technology (KIT, responsibility of the former Karlsruhe Research Center), - Juelich Research Center (FZJ), - Nuclear Technology Competence Center East, - Dresden-Rossendorf Research Center (FZD), - Rossendorf Nuclear Process Technology and Analysis Association (VKTA), - Dresden Technical University, - Zittau/Goerlitz University of Applied Science, - Institute of Nuclear Energy and Energy Systems (IKE) of the University of Stuttgart. (orig.)

  5. Fission product retention in TRISCO coated UO2 particle fuels subjected to HTR simulated core heating tests

    Baldwin, C.A.; Kania, M.J.

    1990-11-01

    Results of the examination and analysis of 25,730 individual microspheres from spherical fuel elements HFR-K3/1 and HFR-K3/3 are reported. The parent spheres were irradiated in excess of end-of-life exposure and subsequently subjected to simulated core heating tests in a special high-temperature furnace at Forschungszentrum, Juelich, GmbH (KFA). Following the heating tests, the spheres were electrolytically deconsolidated to obtain unbonded fuel particles for Irradiated Microsphere Gamma Analyzer (IMGA) analysis. For sphere HFR-K3/1, which was heated for 500 h at 1600 degree C, only four particles were identified as having released fission products. The remaining particles from the sphere showed no statistical evidence of fission product release. Scanning Electron Microscopy (SEM) examination showed that three of the defect particles had large sections of the TRISO coating missing, while the fourth appeared normal. For sphere HFR-K3/3, which was heated for 100 h at 1800 degree C, the IMGA data revealed that fission product release (cesium) from individual particles was significant and that there was large particle-to-particle variation in retention capabilities. Individual particle release (cesium) averaged ten times the KFA-measured integral spherical fuel element release value. In addition, the bimodal distribution of the individual particle data indicated that two distinct modes of failure at fuel temperatures of 1800 degree C and above may exist. 6 refs., 6 figs., 4 tabs

  6. Thematic outlook: the technical outlook for the fuel cell research network (PACO). December 22, 2003 update no. 19; Veille thematique. La veille technique pour le reseau PACO. Actualisation du 22 decembre 2003, no. 19

    NONE

    2003-07-01

    Summaries of several recent articles and patents are gathered here. They deal with fuel cells, the means of transport, the hydrogen production and with the different new other energies. Their different titles are given below : 1)gas turbine/fuel cell arrangement 2)design and fabrication of a SOFC by CERAMIC FUEL CELLS 3)a 'microbial' fuel cell able of converting glucose in electricity with high yields and velocity 4)a hybrid system: combined cycle gas turbine - multi-stage SOFC 5)a SOFC as auxiliary generator of electricity in an aircraft 6)recent development results of fuel in the Juelich research center 7)state of development of the SOFC at Haldor Topsoe/Risoe 8)a cost/advantage analysis of 'clean cars': methodology and applications to the electric cars 9)the generation of current and heat in a aerostat 10)hydrogen free from CO, produced from bio-ethanol steam reforming on cobalt catalysts supported on ZnO. Effect of the metallic precursor 11)device and method based on the cyclic auto-thermal reforming 12)the ammonia, source of hydrogen for a hybrid system: alkaline fuel/battery 13)effect of the Nafion on the activity of Pt-Ru electrocatalysts for the methanol electro-oxidation 14)'VISION 21': an integration of systems based on coal. The references of these articles and patents are detailed. (O.M.)

  7. Experiences with a small scale Solar/Wind pilot installation for basic electrification in the chilean altiplano

    Sapiain, Raul; Ovalle, Ricardo; Torres, Ariel; Brockmeyer, Ricarda; Schmidt, Reinhold [Centro de Energias Renovables/Universidad de Tarapaca, Arica, (Chile); Meer, Andreas V [Solar Institute, Juelich (Germany)

    1998-12-31

    Basic rural electrification programmes are already carried out in the rural areas of northern Chile by local communities and local governments using photovoltaic systems. Solar Home Systems, 12 VDC are installed for individual households while systems for schools, public lighting etc. are realized with bigger systems, 220 VAC. Within a cooperation with the Solar Institute of the Fachhochschule Juelich, Germany, the Renewable Energy Center of the University of Tarapaca designed, installed and evaluated the first solar/wind hybrid installation for basic electrification in northern Chile, realized in Colpitas, a typical small village in the chilean altiplano. The following paper presents results and experiences of this first pilot installation. [Espanol] Ya se estan llevando a cabo programas de electrificacion rural basica en las areas rurales del Norte de Chile por las comunidades y los gobiernos locales, usando sistemas fotovoltaicos. Se instalan Sistemas Domesticos Solares de 12VDC para casas-habitacion individuales, mientras que los sistemas para escuelas, alumbrado publico, etc., se ejecutan con sistemas mas grandes de 220VAC. Con la coperacion del Instituto Solar de la Fachhochschule en Julich, Alemania, el Centro de Energia Renovable de la Universidad de Tarapaca, diseno, instalo y evaluo, la primera instalacion hibrida solar/viento para electrificacion basica en el Norte de Chile, realizado en Colpitas, un pueblo tipico pequeno del altiplano chileno. El siguiete articulo presenta los resultados y experiencias de esta primera instalacion piloto.

  8. Studies on the profile measurement of hadron beams by means of residual-gas luminescence and ionization

    Boehme, Christian Gerhard Heinrich

    2011-01-01

    Modern particle accelerators are applied for a long time no more only in the fundamental physical research but in ever larger extent also in the concrete application for instance in the tumor irradiation or the microprocessor fabrication. The precise knowledge of the beam profile is thereby of great importance for the success. But in intermediate-energy hadron accelerators it hitherto not satisfyingly succeeds to measure the beam profiles not disturbingly. These study presents two not beam-disturbing measuring methods, which are based on the ion beam-residual gas interactions of luminescence and ionization. They were developed for different framework conditions at the JESSICA beam place of the COSY accelerator of the Juelich research center, an advance experiment of the planned European Spallation Source (ESS), as well at the proton synchrotron COSY itself, and the iThemba Laboratory for Accelerator Based Science, Somerset West, South Africa. Thereby the studies consider a large range of possible configuration parameters: Particle momenta from 3 MeV/c to 3 GeV/c, pressures from 1 mbar to 10 -11 mbar and time structures from DC beam to beam bunches of 100 ns length. The experimental arrangement, the application ranges, and the advantages and disadvantages of both methods are explained in this book.

  9. Development and test evaluation of duplex steam reformer tube

    Allen, D.C.; Meyer, D.J.; Pflasterer, G.R.

    1980-01-01

    For HTR applications involving a steam reformer (SR), it is uncertain whether an intermediate heat exchanger (IHX) is required. There are several system configurations that could be developed for the application of nuclear heat using the steam reformer reaction. The considerations (advantages vs. disadvantages) for each of the system configurations are summarized. The approach that technically and economically appears to be the most attractive, in studies conducted by General Electric, combines the SR process heat exchanger and the IHX in a single component using a duplex tube. A central question concerning the duplex tube concept is whether the design would provide adequate leak monitoring capability and significant reduction in tritium and hydrogen diffusion, while introducing only a small increase in overall temperature difference from the helium to the process gas. A cooperative GE-KFA effort was undertaken to develop, fabricate, test, and evaluate a duplex steam reformer tube. GE was responsible for the development and fabrication of the tube, and KFA was responsible for testing the tube in the EVA I facility at Juelich. Both GE and KFA are evaluating the thermochemical and metallurgical test data. Actual fabrication of the tube was performed by Foster-Wheeler in accordance with the GE design. This paper reviews the highlights of the fabrication development and preliminary evaluation of the test data

  10. Department of Detectors and Nuclear Electronics: Overview

    Guzik, Z.

    2003-01-01

    Full text: The basic activities of the Department of Nuclear Electronics were concentrated on the following areas: - studies of new scintillation techniques, - contribution to the big European projects, - electronics for experiments in High Energy Physics, - development, investigation and production of silicon detectors, - development of γ-ray spectrometry apparatus, - development of new generation state of the art PCI based multi-channel analysers, - technical support for the Institute as the whole with special emphasis on networking, - normalisation activities. Most of the scientific achievements concerning the Department were summarized in 20 publications (released or being in press). The papers were published mainly in IEEE Trans. on Nucl. Sci. and Nucl. Instr. and Methods. Besides that, our scientists presented 6 contributions at international conferences (such as IEEE Nuclear Science Symposium 2002 in Norfolk, USA). The Department was involved in scientific collaborations with a number of international centers, such as CERN, Royal Institute of Technology in Stockholm, FZR Rossendorf, IKF Juelich, GSI Darmstadt and companies as Advanced Photonix, Inc in California, Scionix in Holland and Photonis in France. The collaboration with High Energy Physics Department of our Institute was focused on LHCb experiment in CERN. In the studies of new scintillation techniques large area avalanche photodiodes were used successfully to tests numerous scintillators at liquid nitrogen temperature. The study of pure (undoped) NaI showed some intriguing effects dealing with non-proportionality of the light yield versus energy of γ-quanta and intrinsic energy resolution of the crystals, which may provide a deeper insight into origin of intrinsic resolution. A very high-energy resolution of 3.8% was measured for 662 keV γ-rays from a 137 Cs source. Moreover, very promising properties of pure NaI at room temperature were shown for the first time. The study of Hamamatsu avalanche

  11. Joining of zirconia mechanically metallized with titanium União de zircônia mecanicamente metalizada com titânio

    J. S. Pimenta

    2010-07-01

    Full Text Available Direct brazing is a well-known technique for joining ceramics either themselves or to metals, whereby the required costly active filler alloys are considered a handicap of this process. In this work the indirect brazing of zirconia to zirconia mechanically metallized with Ti was successfully achieved using conventional filler alloys. The mechanical metallization specially applied to oxide ceramics is a successfully technique that was patented by Forschungszentrum Juelich, Germany, and it has been the subject of applied researches in the last 10 years. This particular metallization is made at room temperature with low cost production and is environmentally safe. Partially stabilized zirconia with yttria was mechanically metallized with Ti and wetting conditions were evaluated using Ag-28Cu and Au-18Ni fillers. These conventional fillers dissolve part of the Ti-coating becoming on-site at brazing temperature an active filler alloy which reacts with the zirconium oxide to improve wetting on the ceramic surface. Better results were selected for brazing tests in a high-vacuum furnace (A brasagem direta é uma técnica bem conhecida para união de cerâmicas entre si bem como aos metais, segundo a qual as ligas de adição requeridas são consideradas uma relativa desvantagem devido ao aumento nos custos do processo. Neste trabalho, a brasagem indireta da zircônia à zircônia mecanicamente metalizada com Ti foi alcançada com sucesso, usando-se ligas de adição convencionais. A metalização mecânica especialmente aplicada aos óxidos cerâmicos é uma técnica bem sucedida que foi patenteada pelo Forschungszentrum Juelich, Alemanha, e tem sido tema de pesquisas nos últimos 10 anos. Esta metalização particular é feita à temperatura ambiente com baixo custo de produção, sendo ambientalmente segura. Zircônia parcialmente estabilizada com ítria (Y-PSZ foi mecanicamente metalizada com Ti e as condições de molhamento foram avaliadas usando

  12. MARCKO thermal insulation layers. Life predictions for thermal insulation and antioxidant layers. Final report; MARCKO-Waermedaemmschichten. Methoden zur Lebensdauervorhersage von Waermedaemm- und Oxidationsschutzschichten. Schlussbericht

    Schuetze, M.

    2003-07-01

    The project was carried out by MTU, Rolls-Royce and Siemens as industrial partners and FZ-Juelich, DLR and DECHEMA as institutes for the purpose of developing a life model for monocrystalline gas turbine blades with metal coatings. This model was to provide reliable information on the life of the ceramic and coupling agent layers. This report describes the activities of the Karl-Winnacker Institute of DECHEMA e.V.: Isothermal oxidation experiments were carried out in the laboratory at 950-1100 degrees centigrade, followed by a characterisation of the oxidation characteristics on the basis of metallographic sections. Particular interest was taken in the development of the TGO (thermally grown oxide) layers, aluminium depletion in the bond coat on the oxide side, and physical defects in the form of pores, pore populations and microcracks within the TGO or in its immediate vicinity. For the first time ever, these microcracks were classified post-experimentally using SEM pictures, and the maximum dimensions of the cracks were quantified as a function of ageing. Kinetics were established for all these parameters. Growth-induced lateral stresses in the TGO were assessed on the basis of the bending of a thin metal foil of pure bond coat material. In the framework of a sub-project carried out by Rolls-Royce, the mechanical characteristics of APS-sprayed thermal insulation layers was investigated in uniaxial pressure experiments on free, hollow cylindrical annular probes. On the one hand, their thermoelastic characteristics were established using path-controlled cyclic load tests; on the other hand, the thermoplastic characteristics were established using load-controlled creep experiments. Samples were used both in the initial and the sintered state in order to assess the effect of sintering, which was described on the basis of porosity as measured in ceramographic sections. The methods and results are presented in this report. [German] In diesem Verbundprojekt, an dem MTU

  13. Study on the distribution of organic carbon in soil fractions and its reaction potential of binding the pesticides

    Chowdhury, Ashim

    2010-05-01

    STUDY ON THE DISTRIBUTION OF ORGANIC CARBON IN SOIL FRACTIONS AND ITS REACTION POTENTIAL OF BINDING THE PESTICIDES **SUMITRA ROY1, SANKHAJIT ROY1, *ASHIM CHOWDHURY2, SASWATI PRADHAN2 and PETER BURAUEL3 1Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalay, Mohanpur, West Bengal, India. 2Department of Agricultural Chemistry and Soil Science, University of Calcutta, West Bengal, India. 3Institute of Chemical Dynamics & Geosphere, FZ-Juelich, Germany. *Correspondence: ashimkly@hotmail.com **Research work carried out as DAAD Sandwich research fellow at FZ- Juelich, Germany Soil is the ultimate sink of all selectively applied pesticides. In addition to the basic physicochemical data of an active ingredient, the fate of the various compounds is largely determined by the type of application. Finally, pesticide and their metabolites, as well as structural elements, remain in the native carbon reserves of the soil or are sorbed & fixed to clay minerals and clay- humus complexes. Soil organic matter (SOM) and the soil microbial community are the crucial components which regulate soil processes and contribute towards the stability of the soil ecosystem. It is an energy source for biological mineralization processes, functions as a buffer and participates in chemical reaction. Knowledge is essential to understand the extent to which the SOM influences the mobilization and immobilization processes of foreign substance in soil and the substance transport and pollutant decomposition in soil. The freshly incorporated organic matter undergoes mineralization and the non mineralized carbon fraction is of special relevance with respect to soil stability in general and decisive for the fate and particular the persistence of xenobiotics in soil. The biological and physicochemical interactions establishing equilibrium between the organic matter bound, fixed or complexed to the soil matrix and that dissolve in the soil solution must be understood in detail to realize

  14. Research for energy optimized building. Status seminar; Forschung fuer Energieoptimiertes Bauen. Statusseminar

    NONE

    2009-07-01

    Within the meeting of the Project Management Juelich (Juelich, Federal Republic of Germany) and the Bavarian Centre for Applied Energy Research (Wuerzburg, Federal Republic of Germany) between 30th June and 2nd July, 2009, in Wuerzburg the following lectures were held: (1) Optically switchable layers with tungsten oxide (Andreas Georg); (2) Functional coatings for application on outer surfaces of glazings (Hansjoerg Weis); (3) Functional coatings and application (Thomas Hofmann); (4) Thermal insulation in the 21st century: Vacuum-insulation panel and vacuum-isolation glasses (Ulrich Heinemann, Helmut Weinlaeder, Hans-Peter Ebert); (5) Textile composites using thermal insulation composites as an example (Alexandra Saur, Jan Beringer, Andreas Holm, Klaus Sedlbauer); (6) Design of membranes for the enhancement of the energy efficiency in buildings (Jochen Manara et al.); (7) Design of membranes for the energetic sanitation of buildings (Werner Lang et al.); (8) Total energetic analysis of complex HLK systems for buildings (Wolfgang Richter); (9) Review on hybrid aeration systems (Dirk Mueller et al.); (10) IEA SHC-Task 38 (Operating Agent) - Energy efficient cooling and dehumidification (ECOS) (Hans-Martin Henning, Alexander Morgenstern, Constanze Bongs); (11) Air quality controlled aeration of building (Jens Knissel, Marc Grossklos); (12) Development of a solar driven refrigerating absorber / heat pump with a ice storage (Thomas Brendel, Marco Zetzsche, Hans Mueller-Steinhagen); (13) Heat pumps field test 'WP efficiency' - interim results (Marek Miara); (14) ECBCS Annex 49 Low Exergy Systems for High-Performance Buildings and Communities (Dietrich Schmidt, Marlen Schurig); (15) Aquifer storage for the heat supply and cold supply of buildings (Sefan Kranz et al.); (16) Evaluation and optimization of operation of systems for the seasonal heat storage and cold storage in the foundations of office buildings (Herdis Kipry, Franziska Bockelmann, M. Norbert Fisch

  15. Dimensioning and recalculation of activation systems of several different processes; Bemessung und Nachrechnung von Belebungsanlagen verschiedener Verfahrensweisen

    Wichern, M.

    2000-07-01

    In this research paper, several calculation models for the description of biological nitrogen elimination and enhanced biological phosphorous elimination are developed. The steady-state methods are suitable to be used both for the design and simulation and for the extension/optimisation of biological wastewater treatment plants. All developed models are checked for their practical utility; the calculation results are counterchecked with proved models and experimental data. COD approaches for the modelling of intermittent and alternating denitrification and for the Juelich wastewater treatment method were developed. Apart from average and maximum ammonium and nitrate nitrogen effluent values, it is possible to consider states of limited BOD during the denitrification intervals. The model for Cascade denitrification is able to present any number of cascade steps with a free distribution of the influent and the return sludge flow to the denitrification cassettes. Apart from the nitrate nitrogen input, additional oxygen input and internal recycle flows are considered, in order to gain hints about the plant operation with optimal nitrate reduction by using the oxygen balances (BOD). For the design and steady simulation of wastewater treatment plants, the COD-Model calculates the hydrolysis of hardly degradable COD, the denitrification capacity with consideration of rapidly and slowly degradable COD, heterotrophic and autotrophic biomass in the influent, the oxygen input, and the autotrophic endogenous respiration. The model for enhanced biological P-Elimination offers the chance to consider denitrifying and non-denitrifying PAOs and their storage substances (PHA), as well as different decay rates, gain rates, and denitrification performances of the two heterotropic groups. (orig.) [German] Im Rahmen der vorliegenden Arbeit werden verschiedene Berechnungsmodelle zur Beschreibung der biologischen Stickstoffelimination und vermehrten biologischen Phosphorelimination

  16. Radiation sensitizations at DNA-level by chemical and biological agents. Coordinated programme on improvement of radiotherapy of cancer using modifiers of radiosensitivity of cells

    Altmann, H.

    1982-01-01

    Radiation sensitization by chemical agents at DNA level is discussed. Procaine, Halothan and Metronidazole showed no significant effect on unscheduled DNA synthesis (UDS) in mouse spleen cells, investigated by autoradiography and no effect on rejoining of DNA single strand breaks after gamma or UV irradiation. Oxyphenbutazon and prednisolone reduced the replicative DNA synthesis in vitro and in vivo but there was only little effect on DNA repair in the in vivo experiments. These two substances showed also a small reduction in poly(ADP-ribose) synthesis (PAR synthesis). 5-methoxypsoralen (5-MOP) and 8-methoxypsoralen (8-MOP) in combination with UV irradiation showed that 5-MOP was more toxic than mutagen, but induced much less DNA crosslinks than 8-MOP. Autoradiographic studies of radiation sensitization by biological agents showed significant inhibition of UDS in Yoshida tumor cells after acute mycoplasma infection in rats. Nucleoid sedimentation studies showed only in the case of Yoshida tumor cells after mycoplasma infection a dramatic effect in the sedimentation behaviour. Sensitization of cells by changing chromatin structure was also studied. Benzamide, 3-NH 2 -benzamide, 3-Methoxybenzamide, Spermine, Theophyllin and Caffeine were tested in different concentrations on replicative DNA synthesis, UDS after UV irradiation and PAR synthesis Chinese hamster ovary cells. 5-Methoxybenzamide was the strongest sensitizer and inhibitor of the PAR synthesis, and was used in further experiments. Results of KFA Juelich on sensitization of a mamma-adenocarcinoma EO 771 on C57 B1 mice are given. Replicative DNA synthesis, DNA repair and PAR synthesis were compared in spleen cells and adenocarcinoma cells after treatment with 5-Methoxybenzamide. An inhibitory effect on UDS could be shown only in adenocarcinoma cells but not in the mice spleen cells

  17. Post-irradiation examination of HTR-fuel at the Austrian Research Centre Seibersdorf Ltd

    Reitsamer, G.; Proksch, E.; Stolba, G.; Strigl, A.; Falta, G.; Zeger, J.

    1985-01-01

    Austrian R and D activities in the HTR-field reach back almost to the beginning of this advanced reactor line. For more than 20 years post-irradiation examination (PIE) of HTR-fuel has been performed at the laboratories of the Austrian Research Centre Seibersdorf Ltd. (OEFZS) (formerly OESGAE) and a high degree of qualification has been achieved in the course of that time. Most of the PIE-work has been carried out by international cooperation on contract basis with the OECD-DRAGON-project and with KFA-Juelich (FRG). There has also been some collaboration with GA (USA), Belgonucleaire and others in the past. HTR-fuel elements contain the fissile and fertile materials in form of coated particles (CPs) which are embedded in a graphite matrix. Because of this special design it has been necessary from the very beginning of the PIE work up to now to develop new methods (i.e. fuel element disintegration methods, chlorine gas leach, single particle examination techniques...) as well as to adapt and improve already existing methods (i.e. gamma spectrometry, mass-spectrometry, optical methods...). The main interests on PIE-work at Seibersdorf are concentrated on particle performance, fission product distribution and the 'free' Uranium content (contamination and broken particles) of the fuel elements (fuel spheres or cylindrical compacts). A short compilation of the applied methods and of available instrumental facilities is given as follows: deconsolidation of fuel elements; equipment for electrochemical deconsolidation; examinations and measurements of graphite and electrolyte samples; examination of coated particles; single particle examinations

  18. Fusion research in Hungary

    Zoletnik, S.

    2004-01-01

    Hungarian fusion research started in the 1970s, when the idea of installing a small tokamak experiment emerged. In return to computer equipment a soviet tokamak was indeed sent to Hungary and started to operate as MT-1 at the Central Research Institute for Physics (KFKI) in 1979. Major research topics included diagnostic development, edge plasma studies and investigation of disruptions. Following a major upgrade in 1992 (new vacuum vessel, active position control and PC network based data acquisition system) the MT-1M tokamak was used for the study of transport processes with trace impurity injection, micropellet ablation studies, X-ray tomography and laser blow-off diagnostic development. Although funding ceased in the middle of the 90's the group was held alive by collaborations with EU fusion labs: FZ -Juelich, IPP-Garching and CRPP-EPFL Lausanne. In 1998 the machine was dismantled due to reorganization of the Hungarian Academy of Sciences. New horizons opened to fusion research from 1999, when Hungary joined EURATOM and a fusion Association was formed. Since then fusion physics studies are done in collaboration with major EU fusion laboratories, Hungarian researchers also play an active role in JET diagnostics upgrade and ITER design. Major topics are pellet ablation studies, plasma turbulence diagnosis using Beam Emission Spectroscopy and other techniques, tomography and plasma diagnostics using various neutral beams. In fusion relevant technology R and D Hungary has less records. Before joining EURATOM some materials irradiation studies were done at the Budapest Research Reactor at KFKI-AEKI. The present day fusion technology programme focuses still on irradiation studies, nuclear material database and electromagnetic testing techniques. Increasing the fusion technology research activities is a difficult task, as the competition in Hungarian industry is very strong and the interest of organizations in long-term investments into R and D is rather weak and

  19. Effects of fusion relevant transient energetic radiation, plasma and thermal load on PLANSEE double forged tungsten samples in a low-energy plasma focus device

    Javadi, S.; Ouyang, B.; Zhang, Z.; Ghoranneviss, M.; Salar Elahi, A.; Rawat, R. S.

    2018-06-01

    Tungsten is the leading candidate for plasma facing component (PFC) material for thermonuclear fusion reactors and various efforts are ongoing to evaluate its performance or response to intense fusion relevant radiation, plasma and thermal loads. This paper investigates the effects of hot dense decaying pinch plasma, highly energetic deuterium ions and fusion neutrons generated in a low-energy (3.0 kJ) plasma focus device on the structure, morphology and hardness of the PLANSEE double forged tungsten (W) samples surfaces. The tungsten samples were provided by Forschungszentrum Juelich (FZJ), Germany via International Atomic Energy Agency, Vienna, Austria. Tungsten samples were irradiated using different number of plasma focus (PF) shots (1, 5 and 10) at a fixed axial distance of 5 cm from the anode top and also at various distances from the top of the anode (5, 7, 9 and 11 cm) using fixed number (5) of plasma focus shots. The virgin tungsten sample had bcc structure (α-W phase). After PF irradiation, the XRD analysis showed (i) the presence of low intensity new diffraction peak corresponding to β-W phase at (211) crystalline plane indicating the partial structural phase transition in some of the samples, (ii) partial amorphization, and (iii) vacancy defects formation and compressive stress in irradiated tungsten samples. Field emission scanning electron microscopy showed the distinctive changes to non-uniform surface with nanometer sized particles and particle agglomerates along with large surface cracks at higher number of irradiation shots. X-ray photoelectron spectroscopy analysis demonstrated the reduction in relative tungsten oxide content and the increase in metallic tungsten after irradiation. Hardness of irradiated samples initially increased for one shot exposure due to reduction in tungsten oxide phase, but then decreased with increasing number of shots due to increasing concentration of defects. It is demonstrated that the plasma focus device provides

  20. The design of actively cooled plasma-facing components

    Scheerer, M.; Smid, I.; Bolt, H.; Gervash, A.; Linke, J.

    2001-01-01

    In future fusion devices, like in the stellarator Wendelstein 7-X, the target plates of the divertor will be exposed to heat loads up to power densities of 10 MW/m 2 for 1000 s. For this purpose actively cooled target elements with an internal coolant flow return, made of 2-D CFC armor tiles brazed onto a two tube cooling structure were developed and manufactured at the Forschungszentrum Juelich. Individual bent- and coolant flow reversal elements were used to achieve a high flexibility in the shape of the target elements. A special brazing technology, using a thin layer of plasma-arc deposited titanium was used for the bonding of the cooling structure to the plasma facing armor (PFA). FEM-simulations of the thermal and mechanical behavior show that a detachment of about 25% of the bonded area between the copper tubes and the PFA can be tolerated, without exceeding the critical heat flux at 15 MW/m 2 or a surface temperature of 1400 C at 10 MW/m 2 by using twisted tape inserts with a twist ratio of 2 at a cooling water velocity of 10 m/s. Thermal cycling tests in an electron beam facility up to a power density level 10.5 MW/m 2 show a very good behavior of parts of the target elements, which confirms the performance under fusion relevant conditions. Even defected parts in the bonding interface of the target elements, known from ultrasonic inspections before, show no change in the thermal performance under cycling, which confirms also the structural integrity of partly defected regions. (orig.)

  1. The stability of uranium microspheres for future application as reference standard in analytical measurements

    Middendorp, R.; Duerr, M.; Bosbach, D. [Forschungszentrum Juelich GmbH, IEK-6, 52428 Juelich (Germany)

    2016-07-01

    The monitoring of fuel-cycle facilities provides a tool to confirm the compliant operation, for example with respect to emissions into the environment or to supervise non-proliferation commitments. Hereby, anomalous situations can be detected in a timely manner and responsive action can be initiated to prevent an escalation into an event of severe consequence to society. In order to verify non-nuclear weapon states' compliance with the non-proliferation treaty (NPT), international authorities such as the International Atomic Energy Agency (IAEA) conduct inspections at facilities dealing with fissile or fertile nuclear materials. One measure consists of collection of swipe samples through inspectors for later analysis of collected nuclear material traces in the laboratory. Highly sensitive mass spectrometric methods provide a means to detect traces from nuclear material handling activities that provide indication of undeclared use of the facility. There are, however, no relevant (certified) reference materials available that can be used as calibration or quality control standards. Therefore, an aerosol-generation based process was established at Forschungszentrum Juelich for the production of spherical, mono-disperse uranium oxide micro-particles with accurately characterized isotopic compositions and amounts of uranium in the pico-gram range. The synthesized particles are studied with respect to their suitability as (certified) reference material in ultra-trace analysis. Several options for preparation and stabilization of the particles are available, where preparation of particles in suspension offers the possibility to produces specific particle mixtures. In order to assess the stability of particles, dissolution behavior and isotope exchange effects of particles in liquid suspension is studied on the bulk of suspended particles and also via micro-analytical methods applied for single particle characterization. The insights gained within these studies will

  2. Setup and proof of principle of SAPIS (Stored Atoms Polarized Ion Source), a novel source of polarized H-/D- ions

    Emmerich, R.

    2007-01-01

    The objective of this work was the setup and the proof-of-principle of a new type of negative polarized hydrogen or deuterium ion source, which is based on the charge-exchange reaction vectorH 0 +Cs 0 →vectorH - +Cs + , as for instance the Colliding-Beams-Source (CBS) at the Cooler Synchrotron COSY in Juelich. In contrast to the CBS, the use of a storage cell for the charge-exchange region promises an increase in H - current by at least an order of magnitude without considerable polarization losses. For these purposes, a new laboratory was equipped and both a polarized hydrogen/deuterium atomic beam source and an intense neutral cesium-beam source have been build-on. A Lambshift polarimeter, which allows the measurement of the nuclear polarization of the atomic as well as ionic beams, was completed with the construction of a new spin-filter. After commissioning and optimizing each of these sources, a storage cell was developed and installed in the charge-exchange region with a magnetic field. Additionally, components for the extraction, detection and analysis of the negative ion beam were installed. Following the decisive proof of principle, investigation of the properties of the storage cell, especially as to H recombination and depolarisation, was begun. Furthermore, a number of software programs was developed for the control and monitoring of different components of the sources as well as a universal measuring software for the complete installation, including the measurement and calculation of the beam polarization. At the same time, the remote control system of the Cologne source of polarized ions LASCO at the FN tandem accelerator was completely modernized. (orig.)

  3. Department of Nuclear Reactions - Overview

    Nowicki, L.

    2006-01-01

    In 2005 the Department held a steady course. Topics of nuclear physics, atomic physics and materials research that started in previous years were continued. Although our team was smaller than years ago, the scientific activity, estimated by number of published papers is still very high. Scientists of the Department are co-authors or authors of more than 50 papers. Nuclear physics, which is our main-stream activity, covered a wide energy range. It started close to the Coulomb barrier, where 6 He breakup on heavy nuclei were studied, and ended at zones of tens of GeV; such high energies were used to investigate spin structure of deuterons and to explore hadron leptoproduction. Traditionally, experimental investigations in the fields of atomic physics and of physics of materials completed the scene. Our old Van de Graaff accelerator Lech was used for studies of M-shell ionisation of heavy elements, for hardening of Ultra-High Molecular Weight Polyethylene and for characterisation of materials with RBS and NRA techniques. The VdG runs perfectly although it is over 40 years old. Two Ph.D. students finished their theses and were promoted. Izabela Fijal's work concerned multi-ionization and intrashell coupling effects for L-shell x-ray emission induced by heavy ions, while Sergiy Mezhevych showed studies on scattering of 11 B from carbon isotopes. It is obvious that contemporary works on physics do not arise in a single lab. Our contributions to many papers were possible due owing to collaborations involving many institutions. Some of them are listed: GSI, Darmstadt (PANDA Collaboration) DESY, Hamburg (HERMES Collaboration) Institut fuer Kernphysik, Forschungszentrum Juelich Forschungszentrum Rossendorf CSNSM, Orsay GANIL, Caen University of Huelva Institute of Nuclear Research, Kiev SLCJ, Warsaw ITME, Warsaw Some of our colleagues traditionally gave lectures and made physical demonstrations on Warsaw informal learning events: 9 th Science Picnic and 9 th Science Festival

  4. VERAM - Vision and Roadmap for European Raw Materials

    Baumgarten, Wibke; Vashev, Boris

    2017-04-01

    The overall objective of VERAM project is to produce a Vision and Roadmap for European Raw Materials in 2050 based on raw materials research and innovation (R&I) coordination. Two leading European Technology Platforms (ETPs): ETP SMR (Sustainable Minerals Resources) and FTP (Forest Technology Platform) are joining forces to develop a common vison and roadmap with the support of ECTP (European Construction Technology Platform), represented by UNIVPM, SusChem (ETP for Sustainable Chemistry), represented by Cefic, EuMaT (Advanced Materials ETP), represented by VITO, ERAMIN 2, represented by Research Centre JUELICH and WoodWisdom Network Plus represented by the Agency for Renewable Resources (FNR). This partnership provides VERAM with expertise from downstream applications and additional knowledge on non-biotic and biotic raw materials. The project encourages capacity building as well as transfer of knowledge. It expects to provide an innovation reference point for the European Institute of Innovation & Technology (EIT) Raw Materials (formerly the KIC Raw MatTERS), to coordinate the network involved in the European Innovation Partnership (EIP) on Raw Materials Commitments and relevant proposals funded under Horizon 2020. It provides a platform for identifying gaps and complementarities and enables their bridging. VERAM will be able to advise the European Commission and Member States on future research needs and policies to stimulate innovation and assist in overcoming fragmentation in the implementing the EIP Raw Materials Strategic Implementation Plan. VERAM looks for mutually beneficial information exchange, encourages cross-fertilization between actions undertaken by different raw material industries, and expects to accelerate exploitation of breakthrough innovations. One of the main outcomes of the project is the presentation of a common long term 2050 Vision and Roadmap for relevant raw materials including metals, industrial minerals and aggregates and wood. The

  5. Modelling of innovative SANEX process mal-operations

    McLachlan, F.; Taylor, R.; Whittaker, D.; Woodhead, D.; Geist, A.

    2016-01-01

    The innovative (i-) SANEX process for the separation of minor actinides from PUREX highly active raffinate is expected to employ a solvent phase comprising 0.2 M TODGA with 5 v/v% 1-octanol in an inert diluent. An initial extract / scrub section would be used to extract trivalent actinides and lanthanides from the feed whilst leaving other fission products in the aqueous phase, before the loaded solvent is contacted with a low acidity aqueous phase containing a sulphonated bis-triazinyl pyridine ligand (BTP) to effect a selective strip of the actinides, so yielding separate actinide (An) and lanthanide (Ln) product streams. This process has been demonstrated in lab scale trials at Juelich (FZJ). The SACSESS (Safety of Actinide Separation processes) project is focused on the evaluation and improvement of the safety of such future systems. A key element of this is the development of an understanding of the response of a process to upsets (mal-operations). It is only practical to study a small subset of possible mal-operations experimentally and consideration of the majority of mal-operations entails the use of a validated dynamic model of the process. Distribution algorithms for HNO_3, Am, Cm and the lanthanides have been developed and incorporated into a dynamic flowsheet model that has, so far, been configured to correspond to the extract-scrub section of the i-SANEX flowsheet trial undertaken at FZJ in 2013. Comparison is made between the steady state model results and experimental results. Results from modelling of low acidity and high temperature mal-operations are presented. (authors)

  6. An accountancy system for nuclear materials control in research centres

    Buttler, R.; Bueker, H.; Vallee, J.

    1979-01-01

    The Nuclear Accountancy and Control System (NACS) was developed at KFA Juelich in accordance with the requirements of the Non-Proliferation Treaty. The main features are (1) recording of nuclear material in inventory items. These are combined to form batches wherever suitable; (2) extrapolation of accounting data as a replacement for detailed measurement of inventory items data. Recording and control of nuclear material are carried out on two levels with access to a common data bank. The lower level deals with nuclear materials handling plus internal management while on the upper level there is a central control point which is responsible for nuclear safeguarding within the entire research centre. By keeping the organizational and technical infrastructure it was possible to develop a system which is both economical and operator-oriented. In this system the emphasis of nuclear safeguarding is placed on the acquisition of the nuclear material inventory. As much consideration has been given to the interests of the various operational levels and organizational units as to internal and national regulations. Since it is part of the safeguarding and control system, access to the NACS must be restricted to a limited number of users only. Furthermore, it must include facilities for manual control in the form of records. Authorization for access must correspond with the various tasks of different user groups. All necessary data are acquired decentrally in the organizational units and entered via a terminal. It is available to the user groups on both levels through a central data bank. To meet all requirements, the NACS has been designed as an integrated, computer-assisted information system for the automated processing of extensive and multi-level nuclear materials data. As part of the preventive measures entailed with nuclear safeguarding, the accountancy system enables the operator of a nuclear plant to furnish proof of non-diversion of nuclear material. (author)

  7. Conceptual design of a system for nuclear material control in a research centre according to the IAEA safeguards requirements

    Bueker, H.; Kotte, U.; Stein, G.

    1976-01-01

    In comparison with other facilities handling nuclear material, a nuclear research centre is characterized by a wider spectrum of operations. This requires a number of installations within the centre such as research reactors, critical assemblies, research institutes and central departments, operating, in general, independently of each other. Nuclear material is stored and processed in small quantities and in different chemical and physical configurations within prescribed license areas. The conceptual design of a new system for nuclear material control in a research centre has to consider the operator's and IAEA's safeguards requirements. Using the example of the Juelich Nuclear Research Centre in the Federal Republic of Germany, these requirements are being examined in conjunction with the specified peculiarities of a nuclear research centre. Following this, a division of the research centre into material balance areas and key measurement points is being proposed, based on the existing facilities and licence areas. The essential characteristic of the concept is a far-reaching displayability of the inventory and flow of nuclear material. The availability of information is based on differentiated material accountancy in conjunction with adequate measurement of nuclear material data. For data processing and generation of data, a computerized record and report system is to be provided as well as a central measurement system. The design of an integrated accountancy system with a central computer and remote terminals is described; various measuring appliances, now being developed or tested, for the non-destructive assay of nuclear material are specified. The functions of a central department for nuclear material management for operating these systems are discussed and the planned verification of nuclear material in the different material balance areas illustrated. On applying the measures described in this paper, the conceptual design of a system for nuclear material

  8. Work report 1999 of the Safety and Radiation Protection Department

    Hille, R.; Frenkler, K.L.

    2000-05-01

    Research Centre Juelich is a member of the Hermann von Helmholtz Association of German Research Centres (HGF) in which Germany's 16 research institutions are joined together. The Centre's mission is future-oriented basic research and application-oriented research and development. The Centre's research and development activities are subsumed under the following five research priorities: - structure of matter and materials research, - energy technology, - information technology, - environmental precaution research, - life sciences. In order to perform its research tasks, the Research Centre also operates facilities in which radioactive substances are handled or ionizing radiation generated. The following facilities currently in operation are of particular significance in this respect due to their activity inventory or accelerator power: - DIDO research reactor (FRJ-2), - Large Hot Cells, chemistry cells, - interim store for spent AVR fuel elements, - decontamination operations with waste store and waste cells, - TEXTOR fusion experiment, - accelerator facilities such as COSY, JULIC, Compact and BABY cyclotron, - radionuclide laboratories in the fields of chemistry and medicine. The MERLIN research reactor (FRJ-1) has been shut down since 1985 and the fuel discharged, the decommissioning licensing procedure under the Atomic Energy Act is about to be completed. The high-temperature experimental reactor, AVR, has been shut down since the end of 1988 and received a decommissioning licence in 1994. Although it is not part of the Research Centre according to company law, it is supervised by the Research Centre with respect, amongst other aspects, to waste management and fuel element disposal. Core discharge was completed in 1997. Various nuclear facilities licensed pursuant to paragraph 9 of the Atomic Energy Act are being dismantled. This includes the fuel cells and several laboratories at the IFF and IWV-2 institutes. (orig.) [de

  9. Modelling of fission product release behavior from HTR spherical fuel elements under accident conditions

    Verfondern, K.; Mueller, D.

    1991-01-01

    Computer codes for modelling the fission product release behavior of spherical fuel elements for High Temperature Reactors (HTR) have been developed for the purpose of being used in risk analyses for HTRs. An important part of the validation and verification procedure for these calculation models is the theoretical investigation of accident simulation experiments which have been conducted in the KueFA test facility in the Hot Cells at KFA. The paper gives a presentation of the basic modeling and the calculational results of fission product release from modern German HTR fuel elements in the temperature range 1600-1800 deg. C using the TRISO coated particle failure model PANAMA and the diffusion model FRESCO. Measurements of the transient release behavior for cesium and strontium and of their concentration profiles after heating have provided informations about diffusion data in the important retention barriers of the fuel: silicon carbide and matrix graphite. It could be shown that the diffusion coefficients of both cesium and strontium in silicon carbide can significantly be reduced using a factor in the range of 0.02 - 0.15 compared to older HTR fuel. Also in the development of fuel element graphite, a tendency towards lower diffusion coefficients for both nuclides can be derived. Special heating tests focussing on the fission gases and iodine release from the matrix contamination have been evaluated to derive corresponding effective diffusion data for iodine in fuel element graphite which are more realistic than the iodine transport data used so far. Finally, a prediction of krypton and cesium release from spherical fuel elements under heating conditions will be given for fuel elements which at present are irradiated in the FRJ2, Juelich, and which are intended to be heated at 1600/1800 deg. C in the KueFA furnace in near future. (author). 7 refs, 11 figs

  10. Benefits of an ultra large and multiresolution ensemble for estimating available wind power

    Berndt, Jonas; Hoppe, Charlotte; Elbern, Hendrik

    2016-04-01

    In this study we investigate the benefits of an ultra large ensemble with up to 1000 members including multiple nesting with a target horizontal resolution of 1 km. The ensemble shall be used as a basis to detect events of extreme errors in wind power forecasting. Forecast value is the wind vector at wind turbine hub height (~ 100 m) in the short range (1 to 24 hour). Current wind power forecast systems rest already on NWP ensemble models. However, only calibrated ensembles from meteorological institutions serve as input so far, with limited spatial resolution (˜10 - 80 km) and member number (˜ 50). Perturbations related to the specific merits of wind power production are yet missing. Thus, single extreme error events which are not detected by such ensemble power forecasts occur infrequently. The numerical forecast model used in this study is the Weather Research and Forecasting Model (WRF). Model uncertainties are represented by stochastic parametrization of sub-grid processes via stochastically perturbed parametrization tendencies and in conjunction via the complementary stochastic kinetic-energy backscatter scheme already provided by WRF. We perform continuous ensemble updates by comparing each ensemble member with available observations using a sequential importance resampling filter to improve the model accuracy while maintaining ensemble spread. Additionally, we use different ensemble systems from global models (ECMWF and GFS) as input and boundary conditions to capture different synoptic conditions. Critical weather situations which are connected to extreme error events are located and corresponding perturbation techniques are applied. The demanding computational effort is overcome by utilising the supercomputer JUQUEEN at the Forschungszentrum Juelich.

  11. A contribution to the search for the element 114 in nature

    McMinn, J.

    1975-09-01

    Starting from a lead ore having an age of 1.3 x 10 9 years, an already chemically pre-enriched material up to a factor of about 2 to 3 x 10 8 was available for the search of the element 114 based on the properties predicted for eka lead. A further physical enrichment was undertaken using the Juelich high performance electromagnetic isotope separator. The exposed target material (synthetic quartz glass plates)in the mass range 278 to 290 in the mass separator was irradiated with thermal neutrons and the fission tracks were counted under an optical microscope. The background due to fissionable impurities in the quartz ( -13 atoms per SiO 2 molecule) and that due to the use of the mass separator were studied in preliminary experiments. The possible escape of the presumably volatile element 114 from the fission track detectors during irradiation as a result of nuclear γ-heating was also investigated in simulation experiments. The diffusion behaviour of carrier-free 203 Hg implanted into quartz plates in the mass separator, as determined by a radiometric analysis, showed that the expected losses are negligible below 200 0 C. The counting results from the fission track detectors gave a maximum value of 5.1 x 10 -22 barns for the product of the fission cross section sigmasub(f) and the number of eka-lead atoms per lead carrier atom. In order to be able to make an estimate of the absolute concentration limits, the fission cross sections of eka-lead for thermal neutrons were approximated using an extrapolation method. Assuming these approximate fission cross sections, the absolute concentration limits of 8 x 10sup(-24), 3 x 10 -22 and 1 x 10 -19 share of eka-lead atoms per carrier atom were obtained for the isotopes 295, 297 and 298 (sigma = 70 barns, 2 barns and 4 gbarns). (orig./LH) [de

  12. Modelling of the operational behaviour of passive autocatalytic recombiners

    Schwarz, Ulrich

    2011-01-01

    Due to severe accidents in nuclear power plants, a significant amount of hydrogen can be produced. In pressurized water reactors, a possible and wide-spread measurement is the use of auto-catalytic recombiners. There are numerous numerical models describing the operational behaviour of recombiners for containment codes. The numerical model REKO-DIREKT was developed at the Forschungszentrum Juelich. This model describes the chemical reaction on the catalytic sheets by a physical model, as opposed to the usual codes based on empirical correlations. Additionally, there have been experimental studies concerning the catalytic recombination of hydrogen since the 1990s. The aim of this work is the further development of the program REKO-DIREKT to an independent recombiner model for severe accident and containment codes. Therefore, the catalyst model already existed has been submitted by a parameter optimization with an experimental database expanded during this work. In addition, a chimney model has been implemented which allows the calculation of the free convection flow through the recombiner housing due to the exothermal reaction. This model has been tested by experimental data gained by a recently built test facility. The complete recombiner model REKO-DIREKT has been validated by data from literature. Another aim of this work is the derivation of the reaction kinetics for recombiner designs regarding future reactor concepts. Therefore, experimental studies both on single catalytic coated meshes as well as on two meshes installed in a row have been performed in laboratory scale. By means of the measured data, a theoretical approach for the determination of the reaction rate has been derived.

  13. Setup and proof of principle of SAPIS (Stored Atoms Polarized Ion Source), a novel source of polarized H{sup -}/D{sup -} ions; Aufbau und Funktionsnachweis von SAPIS (Stored Atoms Polarized Ion Source), einer neuartigen Quelle polarisierter H{sup -}/D{sup -}-Ionen

    Emmerich, R.

    2007-02-14

    The objective of this work was the setup and the proof-of-principle of a new type of negative polarized hydrogen or deuterium ion source, which is based on the charge-exchange reaction (vector)H{sup 0}+Cs{sup 0}{yields}(vector)H{sup -}+Cs{sup +}, as for instance the Colliding-Beams-Source (CBS) at the Cooler Synchrotron COSY in Juelich. In contrast to the CBS, the use of a storage cell for the charge-exchange region promises an increase in H{sup -} current by at least an order of magnitude without considerable polarization losses. For these purposes, a new laboratory was equipped and both a polarized hydrogen/deuterium atomic beam source and an intense neutral cesium-beam source have been build-on. A Lambshift polarimeter, which allows the measurement of the nuclear polarization of the atomic as well as ionic beams, was completed with the construction of a new spin-filter. After commissioning and optimizing each of these sources, a storage cell was developed and installed in the charge-exchange region with a magnetic field. Additionally, components for the extraction, detection and analysis of the negative ion beam were installed. Following the decisive proof of principle, investigation of the properties of the storage cell, especially as to H recombination and depolarisation, was begun. Furthermore, a number of software programs was developed for the control and monitoring of different components of the sources as well as a universal measuring software for the complete installation, including the measurement and calculation of the beam polarization. At the same time, the remote control system of the Cologne source of polarized ions LASCO at the FN tandem accelerator was completely modernized. (orig.)

  14. Status of FRJ-2 refurbishment of tank pipes and essential results of aging analysis

    Hansen, G.; Thamm, G.; Thome, M.

    1993-01-01

    An aging evaluation program for FRJ-2 (DIDO) of the Forschungszentrum Juelich GmbH has been developed and is currently executed in cooperation with the licensing and regulatory and TUV experts in order to determine the overall life expectancy of the facility and to identify critical systems and components that need to be upgraded or refurbished for future safe reactor operation. In Phase A (completed) a so called master list of the FRJ-2 mechanical, electrical and structural components was compiled on a system-by system basis and the operational documentation with respect to regular inspections, maintenance, repair and unusual occurences was carefully examined. Critical components were selected and their ageing respectively life limiting mechanisms identified. In Phase (currently under way) special inspections, examinations and tests for critical systems/components are being elaborated, executed and evaluated. Current work is being concentrated on non replaceable components (e.g. reactor aluminium tank (RAT) and the connecting pipes to the primary cooling circuit, the reactor steel tank and pipe work inside the concrete reactor block). As a consequence of first results of the aging evaluation program and due to leaks in the weir and drain pipes of the RAT a repair/refurbishment program was set up for the Al-RAT pipes (risers, downcomers weir and drain pipes) and the steel guide tubes. Details of the r/r program which is in far progress and first essential results of the aging evaluation will be presented. The results achieved until today are encouraging with respect to safe reactor operation on short and medium term. (author)

  15. Seismic behaviour of gas cooled reactor components

    1990-08-01

    On invitation of the French Government the Specialists' Meeting on the Seismic Behaviour of Gas-Cooled Reactor Components was held at Gif-sur-Yvette, 14-16 November 1989. This was the second Specialists' Meeting on the general subject of gas-cooled reactor seismic design. There were 27 participants from France, the Federal Republic of Germany, Israel, Japan, Spain, Switzerland, the United Kingdom, the Soviet Union, the United States, the CEC and IAEA took the opportunity to present and discuss a total of 16 papers reflecting the state of the art of gained experiences in the field of their seismic qualification approach, seismic analysis methods and of the capabilities of various facilities used to qualify components and verify analytical methods. Since the first meeting, the sophistication and expanded capabilities of both the seismic analytical methods and the test facilities are apparent. The two main methods for seismic analysis, the impedance method and the finite element method, have been computer-programmed in several countries with the capability of each of the codes dependent on the computer capability. The correlations between calculation and tests are dependent on input assumptions such as boundary conditions, soil parameters and various interactions between the soil, the buildings and the contained equipment. The ability to adjust these parameters and match experimental results with calculations was displayed in several of the papers. The expanded capability of some of the new test facilities was graphically displayed by the description of the SAMSON vibration test facility at Juelich, FRG, capable of dynamically testing specimens weighing up to 25 tonnes, and the TAMARIS facility at the CEA laboratories in Gif-sur-Yvette where the largest table is capable of testing specimens weighing up to 100 tonnes. The proceedings of this meeting contain all 16 presented papers. A separate abstract was prepared for each of these papers. Refs, figs and tabs

  16. ALT-II armor tile design for upgraded TEXTOR operation

    Newberry, B.L.; McGrath, R.T.; Watson, R.D.; Kohlhaas, W.; Finken, K.H.

    1994-01-01

    The upgrade of the TEXTOR tokamak at KFA Juelich was recently completed. This upgrade extended the TEXTOR pulse length from 5 seconds to 10 seconds. The auxiliary heating was increased to a total of 8.0 MW through a combination of neutral beam injection and radio frequency heating. Originally, the inertially cooled armor tiles of the full toroidal belt Advanced Limiter Test -- II (ALT-II) were designed for a 5-second operation with total heating of 6.0 MW. The upgrade of TEXTOR will increase the energy deposited per pulse onto the ALT-II by about 300%. Consequently, the graphite armor tiles for the ALT-II had to be redesigned to avoid excessively high graphite armor surface temperatures that would lead to unacceptable contamination of the plasma. This redesign took the form of two major changes in the ALT-II armor tile geometry. The first design change was an increase of the armor tile thermal mass, primarily by increasing the radial thickness of each tile from 17 mm to 20 mm. This increase in the radial tile dimension reduces the overall pumping efficiency of the ALT-II pump limiter by about 30%. The reduction in exhaust efficiency is unfortunate, but could be avoided only by active cooling of the ALT-II armor tiles. The active cooling option was too complicated and expensive to be considered at this time. The second design change involved redefining the plasma facing surface of each armor tile in order to fully utilize the entire surface area. The incident charged particle heat flux was distributed uniformly over the armor tile surfaces by carefully matching the radial, poloidal and toroidal curvature of each tile to the plasma flow in the TEXTOR boundary layer. This geometry redefinition complicates the manufacturing of the armor tiles, but results in significant thermal performance gains. In addition to these geometry upgrades, several material options were analyzed and evaluated

  17. The contribution of a small TRIGA university research reactor to nuclear research on an international level

    Villa, M.; Bastuerk, M.; Boeck, H.

    2002-01-01

    The paper focuses especially on the important results in neutron- and solid state physics and the co-operation between the low power TRIGA reactor with high flux neutron sources in Europe such as the Institute Laue-Langevin (ILL) in Grenoble, the Paul Scherrer Institut (PSI) in Villigen, the Rutherford Appleton Laboratory (RAL) in Didcot and the Research Center Juelich. Experiments are set up for test purposes at the TRIGA reactor and then transferred to the powerful neutron sources. Different new perfect silicon channel-cut and interferometer crystals are prepared and then tested at the Bonse-Hart camera, which is a double crystal (or triple axis) diffractometer and at the interferometer set-up. Historically, the first verification of neutron interferometry at a perfect crystal device has been achieved at the 250 kW TRIGA-reactor in Vienna in the year 1974. Also the co-operation with the PSI and the TU Munich in the field of neutron radiography and neutron tomography and VESTA, an experiment for storing cold neutrons with a wavelength of 6.27A, installed at the pulsed neutron source ISIS at RAL are mentioned. The second topic in this paper focuses on the co-operation in the field of safeguard. Several projects have been carried out during the past years in co-operation with the IAEA such as establishing a gamma spectrum reference catalogue for CdZnTe detectors and tests of safeguard video cameras under neutron irradiation. Further an integrated safeguard surveillance network composed of a video camera, a gamma monitor and a neutron monitor is under development

  18. Concepts for the interim storage of spent fuel elements from research reactors in the Federal Republic of Germany

    Niephaus, D.; Bensch, D.; Quaassdorff, P.; Plaetzer, S.

    1997-01-01

    Research reactors have been operated in the Federal Republic of Germany since the late fifties. These are Material Test Reactors (MTR) and training, Research and Isotope Facilities of General Atomic (TRIGA). A total of seven research reactors, i.e. three TRIGA and four MTR facilities were still in operation at the beginning of 1996. Provisions to apply to the back-end of the fuel cycle are required for their continued operation and for already decommissioned plants. This was ensured until the end of the eighties by the reprocessing of spent fuel elements abroad. In view of impeding uncertainties in connection with waste management through reprocessing abroad, the development of a national back-end fuel cycle concept was commissioned by the Federal Minister of Education, Science, Research and Technology in early 1990. Development work was oriented along the lines of the disposal concept for irradiated light-water reactor fuel elements from nuclear power plants. Analogously, the fuel elements from research reactors are to be interim-stored on a long-term basis in adequately designed transport and storage casks and then be directly finally disposed without reprocessing after up to forty years of interim storage. As a first step in the development of a concept for interim storage, several sites with nuclear infrastructure were examined and assessed with respect to their suitability for interim storage. A reasonably feasible reference concept for storing the research reactor fuel elements in CASTOR MTR 2 transport and storage casks at the Ahaus interim storage facility (BZA) was evaluated and the hot cell facility and AVR store of Forschungszentrum Juelich (KFA) were proposed as an optional contingency concept for casks that cannot be repaired at Ahaus. Development work was continued with detailed studies on these two conceptual variants and the results are presented in this paper. (author)

  19. The reconstruction of thyroid dose following Chernobyl

    Stepanenko, V.; Kondrashov, A.; Yaskova, E.; Petin, D.; Skvortsov, V.; Parshkov, E.; Gavrilin, Yu.; Khrousch, V.; Shinkarev, S.; Makarenkova, I.; Volkov, V.; Zvonova, I.; Bratilova, A.; Kaidanovsky, J.; Minenko, V.; Drozdovich, V.; Ulanovsky, A.; Korneev, S.; Heinemann, K.; Pomplun, E.; Hille, R.; Bailiff, A.

    1996-01-01

    The report presents the overview of several approaches in working out the methods of thyroid internal dose reconstruction following Chernobyl. One of these approaches was developed (IBPh, Moscow; MRRC, Obninsk; IRM, Minsk) using the correlations between the mean dose calculation based on I 131 thyroid content measurements and Cs 137 contamination of territories. The available data on I 131 soil contamination were taken into account. The lack of data on I 131 soil contamination was supposed to be compensated by I 129 measurements in soil samples from contaminated territories. The semiempiric model was developed for dose reconstruction. The comparison of the results obtained by semiempiric model and empirical values are presented. The estimated values of average dose according semiempiric model were used for individual dose reconstruction. The IRH (St.-Petersburg) has developed the following method for individual dose reconstruction: correlation between the total I 131 radioiodine incorporation in thyroid and whole body Cs 137 content during first months after accident. The individual dose reconstruction is also mentioned to be performed using the data on individual milk consumption during first weeks after accident. For evaluation of average doses it is suggested to use the linear correlation: thyroid dose values based on radioiodine thyroid measurements vs Cs 137 contamination, air kerma rate, mean I 131 concentration in the milk. The method for retrospective reconstruction of thyroid dose caused by short-living iodine nuclides released after the Chernobyl accident has been developed by Research Centre, Juelich, Germany. It is based on the constant ratio that these nuclides have with the long-living I 129 . The contamination of soil samples by this nuclide can be used to assess thyroid doses. First results of I 129 contamination values and derived thyroid doses are to be presented

  20. Status of FRJ-2 Refurbishment of tank pipes and essential results of aging analysis

    Hansen, G.; Thamm, G.; Thome, M.

    1994-01-01

    An aging evaluation program for FRJ-2 (DIDO) of the Forschungszentrum Juelich GmbH has been developed and is currently executed in cooperation with the licensing and regulatory and TUEV experts in order to determine the overall life expectancy of the facility and to identify critical systems and components that need to be upgraded or refurbished for future safe reactor operation. In Phase A (completed) a so called master list of the FRJ-2 mechanical, electrical and structural components was compiled on a system-by system basis and the operational documentation with respect to regular inspections, maintenance, repair and unusual occurrences was carefully examined. Critical components were selected and their ageing respectively life limiting mechanisms identified. In Phase B (currently under way) special inspections, examinations and tests for critical systems/components are being elaborated, executed and evaluated. Current work is being concentrated on non replaceable components (e.g. reactor aluminium tank (RAT) and the connecting pipes to the primary cooling circuit, the reactor steel tank and pipe work inside the concrete reactor block). As a consequence of first results of the aging evaluation program and due to leaks in the weir and drain pipes of the RAT a repair/refurbishment program was set up for the Al-RAT pipes (risers, downcomers, weir and drain pipes) and the steel guide tubes. Details of the r/r program which is in far progress and first essential results of the aging evaluation will be presented. The results achieved until today are encouraging with respect to safe reactor operation on short and medium term. (J.P.N.)

  1. Progress in production and characterization of RF beryllium for ITER fist wall

    Kupriyanov, I.B.; Nikolaev, G.N.; Khomutov, A.M.; Gervash, A.; Romanov, P.V.

    2007-01-01

    Full text of publication follows: Beryllium was chosen as the armor material for the Fist Wall and Port Limiter of ITER. As results of ITER EDA activities the reference beryllium grade S-65C (USA, Brush Wellman) and the DshG-200 grade (RF, Bochvar Institute) were selected as materials for armor of ITER FW. The main criterion of a choice of given grades was their highest resistance against High Heat Flux loading shown by results of thermal fatigue/shock test experiments carried out earlier in SNL (USA) and FZ Juelich (Germany). Recently in RF the new Be grade TGP-56FW has been proposed, which is a modified analogue of DshG-200 grade with improved properties, and also a low-waste manufacturing process for production of Be tiles for armor of ITER FW has been developed. In comparison with DshG-200 grade the main advantage of TGP-56FW grade consists in higher level of strength properties and plasticity as well as higher uniformity of physical-mechanical properties in transverse and longitudinal directions relatively pressing axis. In this paper the results of RF R and D activities in production and characterization of TGP- 56FW beryllium grade for FW armor are presented. The results of HHF tests (thermal fatigue/disruption simulation) on TSEFEY-M testing facility for full-scale beryllium tiles produced from TGP-56FW grade are also reported. A new in-pile integrated test experiment for Be mock-ups that combines thermal cycling (2x10 4 cycles at 0.5 MW/m 2 ) and neutron irradiation (about 0.6 dpa) is discussed.(authors)

  2. IWV-3 report 2005. Future as a challenge

    NONE

    2005-07-01

    The Institute for Energy Process Engineering (IWV-3) is one of three departments of the Institute for Materials and Processes in Energy Systems at Research Centre Juelich. The research tasks of IWV-3 are oriented, on the one hand, to the design and construction of polymer and high-temperature fuel cells and stacks for stationary, portable or mobile applications extending up to complete systems with fuel cells. On the other hand, process- and system-engineering developments comprise the provision of apparatus for fuel processing. These activities are accompanied by basic physico-chemical studies and systems analyses of energy process engineering. The present report wants to provide an insight into the diversified aspects of scientific and technical work at IWV-3. Examples of success demonstrate the implementation of the claim to provide top-class results of social, ecological and economic relevance in an international comparison. The Institute contributes to education and further training in cooperation with universities, universities of applied sciences and training workshops. The description of the fields of activity and of relevant work results illustrates the connection of basic research with technical development work in priority topics. It thus becomes apparent that the Institute's scientific and technical work is oriented to the transformation of research results into innovative products, methods and processes. The presentation of selected R and D projects documents the significance and the role of international cooperations with partners from research and industry. Explanations concerning priority activities and the work approach as well as the allocation of special departments, competence fields and R and D goals will round off the report. (orig.)

  3. The contribution of a small triga university research reactor to nuclear research on an international level

    Villa, M.; Boeck, H.; Weber, H.W.

    2001-01-01

    The paper focuses especially on the important results in neutron- and solid state physics and the co-operation between the low power TRIGA reactor with high flux neutron sources in Europe such as the Institute Laue-Langevin (ILL) in Grenoble, the Paul Scherrer Institut (PSI) in Villigen, the Rutherford Appleton Laboratory (RAL) in Didcot and the Research Center Juelich. Experiments are set up for test purposes at the TRIGA reactor and then transferred to the powerful neutron sources. Different new perfect silicon channel-cut and interferometer crystals are prepared and then tested at the Bonse-Hart camera, which is a double crystal (or triple axis) diffractometer and at the interferometer set-up. Historically, the first verification of neutron interferometry at a perfect crystal device has been achieved at the 250 kW TRIGA-reactor in Vienna in the year 1974. Also the co-operation with the PSI and the TU Munich in the field of neutron radiography and neutron tomography and VESTA, an experiment for storing cold neutrons with a wavelength of 6.27 A, installed at the pulsed neutron source ISIS at RAL will be mentioned. The second topic treated in this paper shows the international co-operation in the field of superconductors. This research work is carried out under two European TMR-Network programs. The third topic in this paper focuses on the co-operation in the field of safeguard. Several projects have been carried out during the past years in co-operation with the IAEA such as establishing a gamma spectrum reference catalogue for CdZnTe detectors and tests of safeguard video cameras under neutron irradiation. Further an integrated safeguard surveillance network composed of a video camera, a gamma monitor and a neutron monitor is under development. (orig.)

  4. Experimental determination of the partitioning coefficient of β-pinene oxidation products in SOAs.

    Hohaus, Thorsten; Gensch, Iulia; Kimmel, Joel; Worsnop, Douglas R; Kiendler-Scharr, Astrid

    2015-06-14

    The composition of secondary organic aerosols (SOAs) formed by β-pinene ozonolysis was experimentally investigated in the Juelich aerosol chamber. Partitioning of oxidation products between gas and particles was measured through concurrent concentration measurements in both phases. Partitioning coefficients (Kp) of 2.23 × 10(-5) ± 3.20 × 10(-6) m(3) μg(-1) for nopinone, 4.86 × 10(-4) ± 1.80 × 10(-4) m(3) μg(-1) for apoverbenone, 6.84 × 10(-4) ± 1.52 × 10(-4) m(3) μg(-1) for oxonopinone and 2.00 × 10(-3) ± 1.13 × 10(-3) m(3) μg(-1) for hydroxynopinone were derived, showing higher values for more oxygenated species. The observed Kp values were compared with values predicted using two different semi-empirical approaches. Both methods led to an underestimation of the partitioning coefficients with systematic differences between the methods. Assuming that the deviation between the experiment and the model is due to non-ideality of the mixed solution in particles, activity coefficients of 4.82 × 10(-2) for nopinone, 2.17 × 10(-3) for apoverbenone, 3.09 × 10(-1) for oxonopinone and 7.74 × 10(-1) for hydroxynopinone would result using the vapour pressure estimation technique that leads to higher Kp. We discuss that such large non-ideality for nopinone could arise due to particle phase processes lowering the effective nopinone vapour pressure such as diol- or dimer formation. The observed high partitioning coefficients compared to modelled results imply an underestimation of SOA mass by applying equilibrium conditions.

  5. Threshold hyperon production in proton-proton collisions at COSY-11

    Rozek, T.

    2005-10-01

    For the first time the pp→nK + Σ + reaction has been measured in the threshold region and the cross section was determined. The measurement was performed at the COSY-11 detection system at two beam momenta P beam =2.6 GeV/c and 2.74 GeV/c, corresponding to excess energies Q=13 MeV and 60 MeV. COSY-11 is an internal magnetic spectrometer experiment at the COoler SYnchrotron and storage ring COSY in Juelich, Germany. It is equipped with scintillator hodoscopes and drift chambers for charged particle detection and a scintillator/lead sandwich detector for neutrons. Experimentally, the Σ + hyperon was identified via the missing mass technique, by detecting the remaining reaction products - K + meson and neutron. Extensive background studies in the missing mass spectra have been performed and the possible influence of the higher partial waves on the detection efficiency discussed. The investigation on the Σ + production is a part of the long ongoing studies of the hyperons production performed by the COSY-11 collaboration. In the previous analysis of the Λ and Σ 0 hyperon production in the pp→pK + Λ and pp→pK + Σ 0 reactions, respectively, the unexpectedly high cross section ratio σ(Λ/σ)(Σ 0 ) in the close to threshold region was observed. To explain this behavior, various theoretical scenarios were proposed, but although they differ even in the dominant basic reaction mechanism, all more or less reproduce the data. In order to get more information for disentangling the contributing reaction mechanisms, data from an other isospin channel were taken, namely pp→nK + Σ + . Within this thesis the method of the measurement and the data analysis is given. The total cross section is presented and the results are discussed in view of available theoretical models. (orig.)

  6. The challenge of introducing HTR plants on to the international power plant market

    Bogen, J.; Stoelzl, D.

    1987-01-01

    The international power plant market today is characterized by high increase in energy consumption for developing countries with limitations of investment capital and low increase in energy consumption for industrialized countries with limitations of additional power plant capacities. As a consequence there is a low demand for large new power stations. This leads to a tendency for small and medium sized power plant units - meeting high environmental standards - for which the total investment volume is low and full load operation of a plant can be realized earlier due to the small block capacity. - For nuclear power plants the High-Temperature-Reactor (HTR)-line with spherical fuel elements and a core structure of graphite is specially suited for this small and medium sized nuclear reactor (SMSNR) capacity. The excellent safety characteristics, the high availability, the low radiation doses for the operation personnel and the environment of the HTR line has been demonstrated by 20 years of operation of the AVR-15 MWe experimental power plant in Juelich F.R.G. and since 1985 by operation of the THTR-300 MWe prototype plant at Hamm-Uentrop F.R.G. Up-dated concepts of the HTR-line are under design for electricity generation (HTR-500), for co-generation of power and heat (HTR-100) and for district heating purposes only (GHR-10). By implementing two HTR projects the Brown Boveri Group is in the position to realize the collected experiences from design, licensing, erection, commissioning and operation for the follow-on projects. This leads to practical and sound technical solutions convenient for existing manufacturing processes, well known materials, standardized components and usual manufacturing tolerances. Specific plant characteristics can be used for advantages in the competition. (author)

  7. Status of HEU-LEU conversion of FRJ-2

    Damm, G.; Nabbi, R.

    2002-01-01

    The operator of the German FRJ-2 research reactor, 'Research Center Juelich', has participated from the beginning in the RERTR programme and made comprehensive contributions to the test and use of LEU fuel for HEU-LEU-conversion measures. The originally planned time scale for the conversion of FRJ-2 was significantly delayed because of a change of the manufacturer of the LEU fuel elements and a 4 years shutdown of the reactor for refurbishment purposes. In the meantime the new LEU fuel elements are qualified and tested in the reactor. In the moment calculations for the safety report are made and it is planned to apply for the license of FRJ-2 operation with LEU fuel at the beginning of 2003. In order to get most reliable results a sophisticated computational method based on a MCNP model coupled with the depletion code BURN was developed for reactor physical calculations, core conversion studies and fuel element performance analysis and applied to the mixed and LEU core. The licensing schedule and results of latest calculations for the conversion study will be presented. The simulations shows that the thermal flux in the LEU core is about 19% resulting in a lower burnup rate. But in the reflector area around the core and in the center of the cold n source the neutron flux reduction remains limited to 6%. Due to a harder neutron spectrum in the LEU core the kinetic and safety related parameters are slightly reduced. Using the ORIGEN code it could be shown that the increase of the total fission products inventory amounts to about 6% compared to a HEU core. As a consequence of the high amount of U-238, the amount of U-235 in the LEU core has to be about 27% higher than in the HEU core but the U-235 burnup is approx. 5% lower due to the contribution of fissile plutonium. (author)

  8. Trying to help the environment - more on the West Ukraine case

    Marchetti, C.

    1992-02-01

    The Hydrogen Economy can be seen as a train ready to move. We should start building the track. In this paper we examine a combination of technologies and circumstances that make large scale water splitting using nuclear heat from HTR reactors an attractive proposition. The idea is to tap a large natural gas pipeline system near an area where oil tertiary recovery pays for the consumption of large amounts of CO 2 . The high value that CO 2 can command is shown by the construction by Shell of long pipelines to carry CO 2 from a natural field to an oil province. Natural gas is steam reformed to H 2 and CO 2 using heat from HTR nuclear reactors with a process developed at KFA Juelich in Germany. The oil province to receive the CO 2 is in West Ukraine where three gas pipelines converge to transport Soviet gas into Western Europe. One of the critics to the original suggestions made at the Moscow Hydrogen Conference in 1988 was that the massive use of reactors (up to 30 GWth) was made improbable by public opinion rejecting nuclear energy wholesale. A study we made for the European Community in the meantime, and whose pertinent results are reported here, shows that the doldrums of nuclear energy are not related to public opinion as such but to the stop-go mechanisms of the economy related to the Kondratiev long cycle. We will try to show that the broad scale evolution of the system will open a 'window of opportunity' for this project during the next 10 years. (author)

  9. A large-area scintillation detector with matrix readout for experiments at COSY

    Wolke, M.

    1993-12-01

    For the requirement of a time-of-flight measurement in the framework of the experiment E5 at the proton synchrotron COSY Juelich by means of a Monte-Carlo simulation the geometrical parameters of a large-area scintillator plane with matrix-arrangement of the read-out photomultipliers could be optimized. A system for the monitoring of the tube amplifications, basing on short light pulses emitted by luminescence diodes, was modificatedly transeferred to this application and successfully tested. For the time resolution of the detector values could be determined, which lie in the mean by about 30 % above the theoretical expectations. For minimally ionizing particles an accuracy of the time-of-flight information from the combination of start and stop scintillator of the experiment E5 in a range σ tof ∼240-260 ps dependent on the incident position of the particle to be analyzed, was measured. On the base of this measurement for protons of a momentum of 1 GeV/c at application of the detector in its second construction stage an upper limit of the time-of-flight resolution of correspondingly σ tof ∼195-220 ps is to be expected. From this a crude upper estimation of the momentum resolution of σ p /p∼1.0-1.2 % results. A position reconstruction by means of the c. m. method showed qualitatively an expected behaviour of the systematic deviations between reconstructed and real incidence positions. Quantitativeley a mean fluctuation of the reconstructed positions of 1.3 respectively 0.8 cm for the horizontal respectively vertical direction is reached

  10. High Resolution 3D Earth Observation Data Analysis for Safeguards Activities

    D'Angelo, P.; Eineder, M.; Rossi, C.

    2015-01-01

    This paper provides an overview of the investigations performed in the last three years at DLR and highlights the application of SAR and optical data for 3D analysis in the context of Safeguards. The Research Center Juelich and the adjacent open cut mines were used as main test site, and a comprehensive stack of ascending and descending TerraSAR data was acquired over two years. TerraSAR data acquisition was performed, and various ways to visualize stacks of radar images were evaluated. Building height estimation was performed using a combination of ascending-descending radar images, as well as height-form-shadow, height-from-layover. A tutorial on building signatures from SAR images highlighted the sensor specific imaging characteristics. These topics were particularly relevant in safeguards activity with a ''small-budget'' as only a single image - or a couple - were employed. Interferometric coherence map interpretation allows the detection of used dirt roads. Digital surface models (DSM) were generated from TanDEM-X interferometric data and from optical VHR data. Sub-meterWorldview-2 and GeoEye-1 data was processed into highly detailed DSM with a grid spacing of 1 m, showing building structures. 3D change and volume detection was performed with both optical and radar DSMs. The TanDEM-X DSMs proved useful for volume change detection and computation in mining areas, and down to building level with optical data. Virtual fly-through were found to be a good tool to provide an intuitive understanding of site structure and might be useful for inspector briefing. Tools for most of the above mentioned tasks have been developed for the ENVI environment and can be used by IAEA internally. (author)

  11. The German P and T Study: Results and Conclusions in the View of the Contributing Helmholtz Research Centres

    Merk, B.; Geist, A.; Knebel, J.; Modolo, G.

    2015-01-01

    The decision to phase out electric energy production in nuclear power plants in Germany has put some questions on the future of P and T research. The Federal Ministry for Economic Affairs and Energy and the Federal Ministry of Education and Research have launched a study managed by the National Academy of Science and Engineering to answer these questions on a broad scientific basis. The major mandate was to evaluate scientific and technological as well as socio-economic challenges and opportunities of the P and T technology in the view of the phase out decision, both in a national and an international context. The scientific and technological aspects of P and T are analysed with respect to a possible contribution to the management of nuclear waste, using the following structure: - Starting point and boundary conditions - waste amounts and final disposal strategies. - Definition and description of scenarios - possible ways for transmutation; European vs. national. - Technology challenges of P and T - description of the major challenges to be solved on the way to a possible industrial application. - Current status of R and D - discussion of possible transmutation systems, current R and D status of P and T, technology gaps and future research strategies. - Safety aspects - dedicated safety aspects including all steps of the P and T cycle. - International projects and competences in Germany - what is going on around the world and which support could come from the German industry? In parallel, the socio-scientific, the ecologic and the economic aspects have been analysed using expert interviews, group Delphi and independent expert opinions on economic, legal and environmental aspects. An overview of the study's results will be given from the viewpoint of the contributing Helmholtz research centres at Juelich (FZJ), Dresden-Rossendorf (HZDR) and Karlsruhe (KIT), with a focus on the research-political recommendations and the developed research strategy proposed to

  12. Twenty-five years of Brown Boveri experience in development, design and fabrication of circulators for HTGR

    Stoelzl, D.

    1988-01-01

    The two circulators for the AVR experimental reactor in Juelich, Federal Republic of Germany, were supplied. The circulators, which are equipped with oil bearings, have been operating troublefree since the start of commissioning in 1966. As a consequence of a water ingress into the reactor resulting from a steam generator damage one bearing was replaced in 1977 after 72,000 operating hours. Up to the present date, each of the circulators has scored 115,000 hours of operation, one of them without any disassembly. In the THTR 300 in Schmehausen, Federal Republic of Germany, 6 BBC circulators are in operation. The insertable circulator units equipped with oil bearings have successfully proven their operating capability without any problems during the commissioning phase and the 100% power operation which was started recently. Currently active magnetic bearings are being developed for advanced gas-cooled reactors such as the HTR 100, the HTR 500 and the heating reactor after excellent results have been furnished by a small prototype in a test loop. This ADI circulator has since scored more than 15,000 operating hours without any trouble. A retainer bearing test stand also equipped with active magnetic bearings has been in operation for nearly 2 years. This test stand serves for developing the conditions for safe rundown of the rotors of even the largest circulators after the magnetic bearings have been deenergized unintentionally. Development work is conducted on the prototype of a safety-relevant circulator held in magnetic bearings, to be used for decay heat removal in the HTR 500. The original aim to have circulators without auxiliary medium for bearing lubrication will thus be reached. The advantages to be obtained in process and systems design are a supplementary support to the inherent safety characteristics of high-temperature reactors. Another advantage of these bearings is cost reduction. 5 refs, 7 figs

  13. Planning and development of nuclear power programmes in the Federal Republic of Germany

    Haunschild, H.H.

    1983-01-01

    The development of the peaceful utilization of nuclear science and technology in the Federal Republic of Germany started in 1955. It concentrated on the development of nuclear energy with its important potential for energy supply, in order to cover the growing energy demand of the recovering economy, and on the application of nuclear radiation and radioactive isotopes in various areas of science and technology such as biology, medicine, chemistry, physics, materials research and development. From the beginning, the nuclear energy programme was a joint undertaking of government, industry and science. To achieve the necessary impetus and to supplement the activities of industry and universities, several nuclear research centres, in particular at Juelich and Karlsruhe, were founded. This comprehensive approach was the basis for the following rapid development of nuclear technology, as well as for its competitive structure and its safety record. With regard to nuclear energy utilization for electricity generation, heat supply, and ship propulsion a broad range of reactor concepts such as light- and heavy-water reactors, high-temperature reactors, and fast-breeder reactors was examined. Today, nuclear energy meets about 17% of the country's electricity demand. Fifteen nuclear power plants with a capacity of about 10,000 MW(e) are in operation; 11 plants with a total capacity of about 12,000 MW(e) are under construction, and the construction of another 10 plants is definitely planned. Activities in uranium enrichment, fuel element fabrication, and reprocessing have reached the industrial stage. The paper indicates possible future trends of the nuclear programme. The successful development of a national nuclear energy programme goes in parallel with broad international co-operation. Therefore the efforts to re-establish a stable system for co-operation in nuclear commerce and technology, based on international safeguards, should be strengthened

  14. Accident Testing of High Temperature Reactor Fuel Elements with the KueFA Device

    Seeger, O.; Laurie, M.; Bottomley, P.D.W.; Ferreira-Teixeira, A.E.; Van Winckel, S.; Rondinella, V.V.; Allelein, H.J.

    2013-06-01

    The High Temperature Reactor (HTR) is characterised by an advanced design with passive safety features. Fuel elements are constituted by a graphite matrix containing sub-mm-sized fuel particles with Tri-Isotropic (TRISO) coating, designed to provide high fission product retention. During a loss of coolant accident scenario in a HTR the maximum temperature is foreseen to be in the range of 1600-1650 deg. C, remaining well below the melting point of the fuel. The Cold Finger Apparatus (KueFA) is used to observe the combined effects of Depressurization and Loss of Forced Circulation (DLOFC) accident scenarios on HTR fuel. Originally designed at the Forschungszentrum Juelich (FZJ), an adapted KueFA operates on irradiated fuel in hot cell at JRC-ITU. A fuel pebble is heated in He atmosphere for several hundred hours, mimicking accident temperatures up to 1800 deg. C and realistic temperature transients. Non-gaseous volatile fission products released from the fuel condense on a water cooled stainless steel plate dubbed 'Cold Finger'. Exchanging plates frequently during the experiment and analysing plate deposits by means of HPGe gamma spectroscopy allows a reconstruction of the fission product release as a function of time and temperature. In order to achieve a good quantification of the release, a careful calibration of the setup is mandatory. An especially tailored collimator was designed to perform plate scanning with high spatial resolution, thus yielding information about the fission product distribution on the condensation plates. The analysis of condensation plates from recent KueFA tests shows that fission product release quantification is possible at high and low activity levels. Chemical dissolution has been performed for some condensation plates in order to assess beta nuclides of interest such as 90 Sr and possibly 129 I using an Inductively Coupled Plasma - Mass Spectrometer (ICP-MS) and to cross check the HPGe gamma spectroscopy measurements

  15. Prompt gamma neutron activation analysis of toxic elements in radioactive waste packages

    Ma, J.-L. [CEA, DEN, Cadarache, Nuclear Measurement Laboratory, F-13108 St Paul-lez-Durance (France); Carasco, C., E-mail: cedric.carasco@cea.fr [CEA, DEN, Cadarache, Nuclear Measurement Laboratory, F-13108 St Paul-lez-Durance (France); Perot, B. [CEA, DEN, Cadarache, Nuclear Measurement Laboratory, F-13108 St Paul-lez-Durance (France); Mauerhofer, E.; Kettler, J.; Havenith, A. [Institute of Energy and Climate Research - Nuclear Waste Management and Reactor Safety, Forschungszentrum Juelich GmbH (Germany)

    2012-07-15

    The French Alternative Energies and Atomic Energy Commission (CEA) and National Radioactive Waste Management Agency (ANDRA) are conducting an R and D program to improve the characterization of long-lived and medium activity (LL-MA) radioactive waste packages. In particular, the amount of toxic elements present in radioactive waste packages must be assessed before they can be accepted in repository facilities in order to avoid pollution of underground water reserves. To this aim, the Nuclear Measurement Laboratory of CEA-Cadarache has started to study the performances of Prompt Gamma Neutron Activation Analysis (PGNAA) for elements showing large capture cross sections such as mercury, cadmium, boron, and chromium. This paper reports a comparison between Monte Carlo calculations performed with the MCNPX computer code using the ENDF/B-VII.0 library and experimental gamma rays measured in the REGAIN PGNAA cell with small samples of nickel, lead, cadmium, arsenic, antimony, chromium, magnesium, zinc, boron, and lithium to verify the validity of a numerical model and gamma-ray production data. The measurement of a {approx}20 kg test sample of concrete containing toxic elements has also been performed, in collaboration with Forschungszentrum Juelich, to validate the model in view of future performance studies for dense and large LL-MA waste packages. - Highlights: Black-Right-Pointing-Pointer Comparison between measurements and MCNP calculation has been performed for a PGNAA system. Black-Right-Pointing-Pointer The system aims at controlling the amount of toxic elements in nuclear waste. Black-Right-Pointing-Pointer Simple samples and a concrete cylinder in which impurities have been added are used. Black-Right-Pointing-Pointer Calculations agree within a factor 2 with measurements. Black-Right-Pointing-Pointer The system can be improved with a better neutron flux monitoring and the use of boron-free graphite.

  16. IN12-UFO: new frontiers for cold triple-axis spectroscopy

    Schmidt, Wolfgang; Ohl, Michael

    2006-01-01

    The IN12 instrument is operated by the Research Centre at Juelich in collaboration with CEA Grenoble as a CRG-B instrument at the Institute Laue Langevin in Grenoble. As a triple-axis spectrometer for cold neutrons it is dedicated for high-resolution studies of low-energy excitations. To meet further challenges as a state-of-the-art instrument we will now upgrade IN12 with a multi-analyzer option. IN12 will then be equipped with a large 2-dimensional position sensitive detector and an array of 15 individual analyser blades which can be rotated and positioned separately in order to map the scattered beam on a user-chosen path in Q-ω-space. We refer to this set-up as IN12-UFO (Universal Focusing Option). The innovative flexibility of the analyzer array is realized by completely non-magnetic drive mechanisms where all relevant parameters are controlled by an absolute encoding system. This mechanics allows to position the individual analyzers so that (a) there are no gaps or overlaps as seen from the sample (optimum coverage) and (b) all reflected beams from the analyzers meet at one single focus point on their way to different spots on the detector surface. The focus point is controlled by a movable diaphragm and provides the only opening between analyzer and detector shielding to prevent cross-talk and to keep the background low. We will present further details of this set-up and demonstrate its flexibility and multiplex advantages for specific physical applications

  17. Design and Fabrication of the Superconducting Bussystem for the Stellarator W7-X

    Sauer, M.; Giesen, B.; Charl, A.

    2006-01-01

    In the framework of cooperation with the Max-Planck-Institute for plasma physics (IPP) essential work packages of the superconducting stellarator Wendelstein 7-X (which is presently under construction at Greifswald, Germany) have been taken over by the Forschungszentrum Juelich (FZJ). One of these packages is the design, construction, qualification, manufacturing and assembly of the superconducting three-dimensional bussystem and its appropriate supports. An overall concept of the project was elaborated with the goal to optimize manufacturing steps, to simplify the system assembly and to provide easy transportation. In order to compensate the magnetic stray fields generated by the bus currents and to facilitate the bus assembly, a suitable bus topology was developed. For checking the geometry of the bent buses and to examine the buses assembly a 1:1 model of one W7-X section (72 o ) has been built. An insulation set up was developed and different samples have been fabricated. For qualification the insulation was examined as follows: - high voltage insulation checks including measurements of the Paschen firmness, - thermal tests and mechanical bending under cryo-temperatures at 77 K, - leakage and high pressure tests to simulate quench situations and - vacuum compatibilities of the materials and methods used. The design will be shown, calculation of magnetic fields and forces are presented. For series production of the 121 buses a production line has been installed. The fabrication process and its main appropriate steps will be presented: 1. Straightening of the superconductor on a rolling machine 2. Rounding on a special turning lathe, required to facilitate 3-dimensional bending 3. Bending on a 3-D-bending machine 4. Checking of geometry on the 1:1 model 5. Electrical insulation and conductive lacquer coat applied by hand 6. Vacuum and high voltage test at several pressure steps (Paschen test) inside bellow tube 7. Transportation in bundle of 6 buses to Greifswald

  18. Short-time leaching behaviour of a cement-matrix incorporating soluble radioactive aggregates

    Daniels, H.; Kalitz, C.; Kuhne, L.; Steinhardt, T.; Caspary, G.; Printz, R.; Scherer, U.W.

    2015-01-01

    As the chemical characterisations of certain cement-based radioactive waste-forms produced by the Nuclear-Services of Juelich Research Centre were not yet fully available, a related study was conducted. In this work the interaction of a specific cement-matrix with incorporated radioactive aggregates, so-called drum-dryer product, was investigated. Therefore, representative cement-samples containing the radioactive waste were taken. The main focus was laid on these samples' behaviour under leaching conditions to quantify soluble and insoluble compounds. Additionally, possible chemical interactions of cement components with drum-dryer product were evaluated. For these purposes, chemical analytics as well as physical methods for characterisation and structural evaluation of the waste-form' s behaviour were used. The leaching experiments lasted for up to 39 days. A comparison of the results of the elementary and ion-chromatographic analysis before and after leaching of the samples was carried out. This lead to the deduction that the majority of the drum-dryer product is not incorporated in the cement matrix in the form of insoluble compounds like a solid solution. Although structural examinations showed the formation of an Apatite-phase that is not characteristic for portland cement, they also supported the measured overall high leachability of the cemented drum-dryer products. It can be concluded that the chemical interaction between the cement matrix and drum-dryer product during and after cementation plays a subordinate, yet not negligible, role with respect to solubility of the drum dryer product under aqueous leaching conditions. Additionally, it can be postulated that the drum-dryer product did not undergo substantial chemical alteration in the environment created by the cement-matrix and the respective leaching experiments. (authors)

  19. Strategy for decommissioning of NPP's in Germany

    Rittscher, D.; Sterner, H.

    2003-01-01

    According to German Atomic Law, two different strategies are possible, i.e. direct dismantling and safe enclosure before dismantling. Both approaches have their advantages and disadvantages. Taking into account the site and plant specific conditions the optimal strategy can be evaluated. Both approaches have been applied in Germany in the past. The German Atomic Law and the Radiation Protection Ordinance (June 2002) were adapted recently (July 2002). Additionally, the life operation time of the German NPP's was fixed in a new law (April 2002): Orderly Termination of the Commercial Production of Nuclear Electricity. These issues have made it necessary for the power utilities to review the strategies applied. As long as the final disposal in Germany is still an open issue, the construction of local Interim Stores is necessary to be able to dismantle a NPP. The basic strategies are not excluding each other and it seems clear today, that the optimal approach is a combination of these strategies, e.g. dismantling of all auxiliary systems and leaving activated parts for a longer SE period. Within this approach the advantages of both basic strategies have been integrated in one. The EWN GmbH has developed such integrated but still different approaches for the decommissioning projects of the Kernkraftwerke Greifswald (KGR) and the Arbeitsgemeinschaft Versuchsreaktor (AVR) Juelich. It can be stated that the decommissioning of a NPP does not present technical issues of concern, but is more a project management issue, although surrounded by sometime intricate political and juridical boundary conditions. A major strategy change is to be expected only when final disposal capacities are available in the future. (authors)

  20. Reactivity control in HTR power plants with respect to passive safety system. Summary

    Barnert, H; Kugeler, K [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Sicherheitsforschung und Reaktortechnik

    1996-12-01

    The R and D and Demonstration of the High Temperature Reactor (HTR) is described in overview. The HTR-MODULE power plant, as the most advanced concept, is taken for the description of the reactivity control in general. The idea of the ``modularization of the core`` of the HTR has been developed as the answer on the experiences of the core melt accident at Three Miles Island. The HTR module has two shutdown systems: The ``6 rods``-system for hot shutdown at the ``18 small absorber pebbles units`` - system for cold shutdown. With respect to the definition of ``Passive Systems`` of IAEA-TECDOC-626 the total reactivity control system of the HTR-MODULE is a passive system of category D, because it is an emergency reactor shutdown system based on gravity driven rods, and devices, activated by fail-safe trip logic. But reactivity control of the HTR does not only consist of these engineered safety system but does have a self-acting stabilization by the negative temperature coefficient of the reactivity, being rather effective in reactivity control. Examples from computer calculations are presented, and, in addition, experimental results from the ``Stuck Rod Experiment`` at the AVR reactor in Juelich. On the basis of this the proposal is made that ``self-acting stabilization as a quality of the function`` should be discussed as a new category in addition to the active and passive engineered safety systems, structures and components of IAEA-TECDOC-626. The requirements for a future ``catastrophe-free`` nuclear technology are presented. In the appendix the 7th amendment of the atomic energy act of the Federal Republic of Germany, effective 28 July 94, is given. (author).