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Sample records for astrid storage ring

  1. Muon storage ring

    CERN Multimedia

    1974-01-01

    The muon storage ring where the g-2 of the muon is being measured with extremely high accuracy. The ring is 14-m in diameter and has very precise magnetic bending and electric focussing fields so that the muons orbit the ring under well-defined conditions.

  2. Storage Ring EDM Experiments

    Science.gov (United States)

    Semertzidis, Yannis K.

    2016-04-01

    Dedicated storage ring electric dipole moment (EDM) methods show great promise advancing the sensitivity level by a couple orders of magnitude over currently planned hadronic EDM experiments. We describe the present status and recent updates of the field.

  3. Electrostatic Storage Ring

    CERN Document Server

    Conte, Mario

    2012-01-01

    In the trial \\cite{BNL} of measuring the proton electric moment, storage rings with electrostatic lattice have been considered. Here an overview is given about the main parameters regarding such a kind of focusing. Beyond confirming all the issues regarding this subject, a non-null element $M_{31}$ is introduced in all the $3\\times 3$ matrices which deal with the vector $(x,x',\\Delta p/p)$ and its role is discussed.

  4. JAERI storage ring JSR

    International Nuclear Information System (INIS)

    A design study for a next generation 8 GeV synchrotron radiation facility is in progress in Japan, and the Japan Atomic Energy Research Institute (JAERI) and Institute of Physical and Chemical Research (RIKEN) have join forces in this project. A compact electron storage ring JSR has been under construction in the linac building in the Tokai Research Establishment of JAERI to serve for studies of various kind of accelerator technologies, examination of insertion devices and beam monitors, and training of young researchers. This paper describes the lattice design, injection system, magnets, vacuum system, RF system, control system and beam monitors and presents some operation results regarding the electron beam injection and storage. The JSR is presently in good condition concerning it's fundamental functions such as injection, storage at around 150 MeV and 300 MeV, and acceleration from 150 MeV and 300 MeV. Photon induced gas desorption is still large because the vacuum chamber has not been aged heavily by synchrotron radiation. (N.K.)

  5. Reversible Seeding in Storage Rings

    Energy Technology Data Exchange (ETDEWEB)

    Ratner, Daniel; Chao, Alex; /SLAC

    2011-12-14

    We propose to generate steady-state microbunching in a storage ring with a reversible seeding scheme. High gain harmonic generation (HGHG) and echo-enabled harmonic generation (EEHG) are two promising methods for microbunching linac electron beams. Because both schemes increase the energy spread of the seeded beam, they cannot drive a coherent radiator turn-by-turn in a storage ring. However, reversing the seeding process following the radiator minimizes the impact on the electron beam and may allow coherent radiation at or near the storage ring repetition rate. In this paper we describe the general idea and outline a proof-of-principle experiment. Electron storage rings can drive high average power light sources, and free-electron lasers (FELs) are now producing coherent light sources of unprecedented peak brightness While there is active research towards high repetition rate FELs (for example, using energy recovery linacs), at present there are still no convenient accelerator-based sources of high repetition rate, coherent radiation. As an alternative avenue, we recently proposed to establish steady-state microbunching (SSMB) in a storage ring. By maintaining steady-state coherent microbunching at one point in the storage ring, the beam generates coherent radiation at or close to the repetition rate of the storage ring. In this paper, we propose a method of generating a microbunched beam in a storage ring by using reversible versions of linac seeding schemes.

  6. The Circular RFQ Storage Ring

    International Nuclear Information System (INIS)

    This paper presents a novel idea of storage ring for the accumulation of intense beams of light and heavy ions at low energy. The new concept is a natural development of the combined features of conventional storage rings and ion traps, and is basically a linear RFQ bent on itself. The advantages are: smaller beam dimensions, higher beam intensity, and a more compact storage device

  7. The circular RFQ storage ring

    International Nuclear Information System (INIS)

    This paper presents a novel idea of storage ring for the accumulation of intense beams of light and heavy ions at low energy. The new concept is a natural development of the combined features used in a conventional storage ring and an ion trap, and is basically a linear RFQ bend on itself. In summary the advantages are: smaller beam dimensions, higher beam intensity, and a more compact storage device

  8. Autumn study on storage rings

    CERN Multimedia

    1974-01-01

    The first two weeks of October have seen storage ring people from accelerator Laboratories throughout the world at CERN to study the fundamental problems of very high energy protonproton colliding beam machines.

  9. Transmutation in ASTRID

    International Nuclear Information System (INIS)

    Within the scope of the French Act of 28 June 2006 on managing long-lived radioactive waste, one of the objectives of the ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) reactor is to demonstrate the capacity to transmute minor actinides (MA) on an industrial scale. Demonstration scenarios currently focus on two modes of transmutation: a homogeneous mode using a standard fuel with low MA content, and a heterogeneous mode where the minor actinides are loaded in the radial blanket around the core, known as the minor-actinide-bearing blanket (MABB) concept. With different initial MA concentrations for the two modes of transmutation, we have estimated their impact on the performance and safety of the ASTRID reactor core. The consequences on the dimensions of the storage means, the handling systems and the fuel sub-assembly transport packaging are also reviewed in order to identify the limits beyond which significant design changes to the core and nuclear steam supply system (NSSS) would be required. Analysis of the results has made it possible to identify the most suitable irradiation conditions and initial contents to demonstrate transmutation in ASTRID, with the main aim of achieving a balance in the minor actinide flows without significantly changing the reactor design: • Americium (Am), a main contributor to the heat and the radiotoxicity of radioactive waste after the decay of fission products, will be treated as a top priority, • Part of the americium can be overridden by neptunium (Np) without any impact on the design and performance, • Curium (Cm) is not considered; it’s too penalising in the handling of new sub-assemblies, • Possible weight levels for the demonstration: 2% of Am in the fuel for the homogeneous mode and 10% of Am in the blanket for the heterogeneous mode. Whatever the chosen mode of transmutation, it will be necessary to conduct experimental programmes in ASTRID to validate and qualify the behaviour of

  10. A new storage-ring light source

    Energy Technology Data Exchange (ETDEWEB)

    Chao, Alex [SLAC National Accelerator Lab., Menlo Park, CA (United States)

    2015-06-01

    A recently proposed technique in storage ring accelerators is applied to provide potential high-power sources of photon radiation. The technique is based on the steady-state microbunching (SSMB) mechanism. As examples of this application, one may consider a high-power DUV photon source for research in atomic and molecular physics or a high-power EUV radiation source for industrial lithography. A less challenging proof-of-principle test to produce IR radiation using an existing storage ring is also considered.

  11. APS storage ring vacuum system

    International Nuclear Information System (INIS)

    The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's experimental program. The Storage Ring's 1104 m circumference is divided into 40 functional sectors. The sectors include vacuum, beam transport, control, acceleration and insertion device components. The vacuum system, which is designed to operate at a pressure of 1 n Torr, consists of 240 connected sections, the majority of which are fabricated from an aluminum alloy extrusion. The sections are equipped with distributed NeG pumping, photon absorbers with lumped pumping, beam position monitors, vacuum diagnostics and valving. The details of the vacuum system design, selected results of the development program and general construction plans are presented. 11 refs., 6 figs., 3 tabs

  12. Storage ring optimization. Ch. 1

    International Nuclear Information System (INIS)

    Most existing electron-storage rings have been optimized and constructed for the needs of high-energy physics. Storage rings designed to serve as high-brightness synchrotron light sources, in contrast, require a very different optimization. Particle beams in colliding beam facilities for high-energy physics experiments produce the highest efficiency, called luminosity, when they have a large cross section, while very small cross sections are required for maximum performance of synchrotron radiation sources The optimization of high-brightness synchrotron-radiation sources has been studied at many laboratories around the world and in this chapter it is tried to recount the goals and achievements of these efforts. (author). 26 refs.; 17 figs

  13. Two Superconducting Storage Rings: ISABELLE

    Energy Technology Data Exchange (ETDEWEB)

    Sanford, J. R.

    1978-01-01

    The general features of the design and the status of the ISABELLE storage ring project at the present time are reported. It brings up to date the results reported at the National Particle Accelerator Conference in March 1977. The most significant change since that time has been an upgrading of the energy of the overall facility, and acceptance of the project by the Department of Energy.

  14. Storage-Ring Mass Spectrometry in Japan

    Science.gov (United States)

    Suzaki, Fumi; Yamaguchi, Takayuki

    Atomic masses are a fundamental ground-state property of nuclei, reflecting a wide variety of structures and dynamics among nucleons. High-precision mass values of short-lived, in particular neutron-rich, nuclei are a key issue toward full understanding of astrophysical nucleosynthesis, as well as nuclear shell evolution far from stability. Beyond the precision mass measurements performed at worldwide ion-trap facilities, a new method of storage-ring mass spectrometry is now being developed at the RIKEN RI Beam Factory in Japan. Combined with the highest intensities of intermediate-energy radioactive ion beams currently available through in-flight separation of uranium fission products, the present method will enable us to measure the masses of extremely neutron-rich, rare species located on the r-process pathway, with a tiny yield (as low as ~1 counts/day).

  15. Neutrino Signals in Electron-Capture Storage-Ring Experiments

    Directory of Open Access Journals (Sweden)

    Avraham Gal

    2016-06-01

    Full Text Available Neutrino signals in electron-capture decays of hydrogen-like parent ions P in storage-ring experiments at GSI are reconsidered, with special emphasis placed on the storage-ring quasi-circular motion of the daughter ions D in two-body decays P → D + ν e . It is argued that, to the extent that daughter ions are detected, these detection rates might exhibit modulations with periods of order seconds, similar to those reported in the GSI storage-ring experiments for two-body decay rates. New dedicated experiments in storage rings, or using traps, could explore these modulations.

  16. Storage ring proton EDM experiment

    CERN Document Server

    CERN. Geneva

    2015-01-01

    sensitivity of 10^-29 e-cm.  The strength of the method originates from the fact that there are high intensity polarized proton beams available and the fact that the so-called geometric phase systematic error background cancels with clock-wise and counter-clock-wise storage possible in electric rings. The ultimate sensitivity of the method is 10^-30 e-cm. At this level it will either detect a non-zero EDM or it will eliminate electro-weak baryogenesis.

  17. The Cryogenic Storage Ring CSR

    CERN Document Server

    von Hahn, Robert; Berg, Felix; Blaum, Klaus; Breitenfeldt, Christian; Fadil, Hisham; Fellenberger, Florian; Froese, Michael; George, Sebastian; Göck, Jürgen; Grieser, Manfred; Grussie, Florian; Guerin, Elisabeth A; Heber, Oded; Herwig, Philipp; Karthein, Jonas; Krantz, Claude; Kreckel, Holger; Lange, Michael; Laux, Felix; Lohmann, Svenja; Menk, Sebastian; Meyer, Christian; Mishra, Preeti M; Novotný, Oldřich; Connor, Aodh P O; Orlov, Dmitry A; Rappaport, Michael L; Repnow, Roland; Saurabh, Sunny; Schippers, Stefan; Schröter, Claus Dieter; Schwalm, Dirk; Schweikhard, Lutz; Sieber, Thomas; Shornikov, Andrey; Spruck, Kaija; Kumar, Sudhakaran Sunil; Ullrich, Joachim; Urbain, Xavier; Vogel, Stephen; Wilhelm, Patrick; Wolf, Andreas; Zajfman, Daniel

    2016-01-01

    An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 $\\pm$ 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion) and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas den...

  18. The cryogenic storage ring CSR.

    Science.gov (United States)

    von Hahn, R; Becker, A; Berg, F; Blaum, K; Breitenfeldt, C; Fadil, H; Fellenberger, F; Froese, M; George, S; Göck, J; Grieser, M; Grussie, F; Guerin, E A; Heber, O; Herwig, P; Karthein, J; Krantz, C; Kreckel, H; Lange, M; Laux, F; Lohmann, S; Menk, S; Meyer, C; Mishra, P M; Novotný, O; O'Connor, A P; Orlov, D A; Rappaport, M L; Repnow, R; Saurabh, S; Schippers, S; Schröter, C D; Schwalm, D; Schweikhard, L; Sieber, T; Shornikov, A; Spruck, K; Sunil Kumar, S; Ullrich, J; Urbain, X; Vogel, S; Wilhelm, P; Wolf, A; Zajfman, D

    2016-06-01

    An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed, and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 ± 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion), and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm(-3) is derived, equivalent to a room-temperature pressure below 10(-14) mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams. PMID:27370434

  19. The cryogenic storage ring CSR

    Science.gov (United States)

    von Hahn, R.; Becker, A.; Berg, F.; Blaum, K.; Breitenfeldt, C.; Fadil, H.; Fellenberger, F.; Froese, M.; George, S.; Göck, J.; Grieser, M.; Grussie, F.; Guerin, E. A.; Heber, O.; Herwig, P.; Karthein, J.; Krantz, C.; Kreckel, H.; Lange, M.; Laux, F.; Lohmann, S.; Menk, S.; Meyer, C.; Mishra, P. M.; Novotný, O.; O'Connor, A. P.; Orlov, D. A.; Rappaport, M. L.; Repnow, R.; Saurabh, S.; Schippers, S.; Schröter, C. D.; Schwalm, D.; Schweikhard, L.; Sieber, T.; Shornikov, A.; Spruck, K.; Sunil Kumar, S.; Ullrich, J.; Urbain, X.; Vogel, S.; Wilhelm, P.; Wolf, A.; Zajfman, D.

    2016-06-01

    An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed, and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 ± 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion), and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm-3 is derived, equivalent to a room-temperature pressure below 10-14 mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams.

  20. Nuclear physics experiments with ion storage rings

    Science.gov (United States)

    Litvinov, Yu. A.; Bishop, S.; Blaum, K.; Bosch, F.; Brandau, C.; Chen, L. X.; Dillmann, I.; Egelhof, P.; Geissel, H.; Grisenti, R. E.; Hagmann, S.; Heil, M.; Heinz, A.; Kalantar-Nayestanaki, N.; Knöbel, R.; Kozhuharov, C.; Lestinsky, M.; Ma, X. W.; Nilsson, T.; Nolden, F.; Ozawa, A.; Raabe, R.; Reed, M. W.; Reifarth, R.; Sanjari, M. S.; Schneider, D.; Simon, H.; Steck, M.; Stöhlker, T.; Sun, B. H.; Tu, X. L.; Uesaka, T.; Walker, P. M.; Wakasugi, M.; Weick, H.; Winckler, N.; Woods, P. J.; Xu, H. S.; Yamaguchi, T.; Yamaguchi, Y.; Zhang, Y. H.

    2013-12-01

    In the last two decades a number of nuclear structure and astrophysics experiments were performed at heavy-ion storage rings employing unique experimental conditions offered by such machines. Furthermore, building on the experience gained at the two facilities presently in operation, several new storage ring projects were launched worldwide. This contribution is intended to provide a brief review of the fast growing field of nuclear structure and astrophysics research at storage rings.

  1. Low-emittance Storage Rings

    CERN Document Server

    Wolski, A

    2014-01-01

    The effects of synchrotron radiation on particle motion in storage rings are discussed. In the absence of radiation, particle motion is symplectic, and the beam emittances are conserved. The inclusion of radiation effects in a classical approximation leads to emittance damping: expressions for the damping times are derived. Then, it is shown that quantum radiation effects lead to excitation of the beam emittances. General expressions for the equilibrium longitudinal and horizontal (natural) emittances are derived. The impact of lattice design on the natural emittance is discussed, with particular attention to the special cases of FODO-, achromat- and theoretical-minimum-emittance-style lattices. Finally, the effects of betatron coupling and vertical dispersion (generated by magnet alignment and lattice tuning errors) on the vertical emittance are considered.

  2. ASTRID II satellit projekt

    DEFF Research Database (Denmark)

    Jørgensen, John Leif; Primdahl, Fritz

    1997-01-01

    The report describes the instruments developed for the Swedish micro satellite "ASTRID II". Specifications of the two instruments realized under this contract, a Stellar Compass and a CSC magnetometer are given follwed by a description of the project status and plan.......The report describes the instruments developed for the Swedish micro satellite "ASTRID II". Specifications of the two instruments realized under this contract, a Stellar Compass and a CSC magnetometer are given follwed by a description of the project status and plan....

  3. Storage ring and laser nuclear spectroscopy

    International Nuclear Information System (INIS)

    Storage-ring technique is complementary to trapping-ion technique. A storage ring for energetic ions will enable us to study exotic phenomena, such as hydrogenic atoms and enhanced β-decay of 'bare nuclei'. A storage ring for low-energy ions is good for precise laser-nuclear spectroscopy. TARN-II is a kind of the former, and it is suggested that an extremely high magnetic field produced by a highly ionized atom gives us insight into nuclear magnetism if hyperfine anomaly is observed for such an atom. (author)

  4. Proton storage ring: man/machine interface

    International Nuclear Information System (INIS)

    The human interface of the Proton Storage Ring Control System at Los Alamos is described in some detail, together with the software environment in which operator interaction programs are written. Some examples of operator interaction programs are given

  5. The "g-2" Muon Storage Ring

    CERN Multimedia

    1974-01-01

    The "g-2" muon storage ring, shortly before completion in June 1974. Bursts of pions (from a target, hit by a proton beam from the 26 GeV PS) are injected and polarized muons from their decay are captured on a stable orbit. When the muons decay too, their precession in the magnetic field of the storage ring causes a modulation of the decay-electron counting rate, from which the muon's anomalous magnetic moment can be determined. In 1977, the "g-2" magnets were modified to build ICE (Initial Cooling Experiment), a proton and antiproton storage ring for testing stochastic and electron cooling. Later on, the magnets had a 3rd life, when the ion storage ring CELSIUS was built from them in Uppsala. For later use as ICE, see 7711282, 7802099, 7809081,7908242.

  6. National synchrotron light source VUV storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Blumberg, L.; Bittner, J.; Galayda, J.; Heese, R.; Krinsky, S.; Schuchman, J.; van Steenbergen, A.

    1979-01-01

    A 700 MeV electron storage ring designed for synchrotron radiation applications is described. Lattice and stability calculations are presented and the vacuum, correction and injection systems are discussed.

  7. APS storage ring vacuum system performance

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) storage ring was designed to operated with 7-GeV, 100-mA positron beam with lifetimes > 20 hours. The lifetime is limited by residual gas scattering and Touschek scattering at this time. Photon-stimulated desorption and microwave power in the rf cavities are the main gas loads. Comparison of actual system gas loads and design calculations will be given. In addition, several special features of the storage ring vacuum system will be presented

  8. Storage-ring Electron Cooler for Relativistic Ion Beams

    OpenAIRE

    Lin, F; Derbenev, Y. S.; Douglas, D.; Guo, J.; Johnson, R P.; Krafft, G.; Morozov, V. S.; Zhang, Y.

    2016-01-01

    Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron radiation damping of the electron beam. However, the range of ion energies where storage-ring elect...

  9. Storage rings for radioactive ion beams

    Science.gov (United States)

    Nolden, F.; Dimopoulou, C.; Dolinskii, A.; Steck, M.

    2008-10-01

    Storage rings for radioactive heavy ions can be applied for a wide range of experiments in atomic and nuclear physics. The rare isotope beams are produced in flight via fragmentation or fission of high-intensity primary ions and they circulate in the storage ring at moderately relativistic energies (typically between 0.1 GeV/u up to 1 GeV/u). Due to their production mechanism they are usually highly charged or even fully stripped. The circulating radioactive heavy ion beams can be used to measure nuclear properties such as masses and decay times, which, in turn, can depend strongly on the ionic charge state. The storage rings must have large acceptances and dynamic apertures. The subsequent application of stochastic precooling of the secondary ions which are injected with large transverse and longitudinal emittances, and electron cooling to reach very high phase space densities has turned out to be a helpful tool for experiments with short-lived ions having lifetimes down to a few seconds. Some of these experiments have already been performed at the experimental storage ring ESR at GSI. The storage ring complex of the FAIR project is intended to enhance significantly the range of experimental possibilities. It is planned to extend the scope of experimental possibilities to collisions with electron or antiproton beams.

  10. Stable CSR in storage rings: A model

    Energy Technology Data Exchange (ETDEWEB)

    Sannibale, Fernando; Byrd, John M.; Loftsdottir, Agusta; Venturini, Marco; Abo-Bakr, Michael; Feikes, Jorge; Holldack, Karsten; Kuske, Peter; Wustefeld, Godehart; Hubers, Heinz-Willerm; Warnock, Robert

    2005-01-03

    A comprehensive historical view of the work done on coherent synchrotron radiation (CSR) in storage rings is given in reference [1]. Here we want just to point out that even if the issue of CSR in storage rings was already discussed over 50 years ago, it is only recently that a considerable number of observations have been reported. In fact, intense bursts of coherent synchrotron radiation with a stochastic character were measured in the terahertz frequency range, at several synchrotron light source storage rings [2-8]. It has been shown [8-11], that this bursting emission of CSR is associated with a single bunch instability, usually referred as microbunching instability (MBI), driven by the fields of the synchrotron radiation emitted by the bunch itself. Of remarkably different characteristics was the CSR emission observed at BESSY II in Berlin, when the storage ring was tuned into a special low momentum compaction mode [12, 13]. In fact, the emitted radiation was not the quasi-random bursting observed in the other machines, but a powerful and stable flux of broadband CSR in the terahertz range. This was an important result, because it experimentally demonstrated the concrete possibility of constructing a stable broadband source with extremely high power in the terahertz region. Since the publication of the first successful experiment using the ring as a CSR source [14], BESSY II has regular scheduled user s shifts dedicated to CSR experiments. At the present time, several other laboratories are investigating the possibility of a CSR mode of operation [15-17] and a design for a new ring optimized for CSR is at an advanced stage [18]. In what follows, we describe a model that first accounts for the BESSY II observations and then indicates that the special case of BESSY II is actually quite general and typical when relativistic electron storage rings are tuned for short bunches. The model provides a scheme for predicting and optimizing the performance of ring

  11. Dedicated storage rings for nuclear physics

    International Nuclear Information System (INIS)

    The use of internal targets in circulating beams of electron storage and stretcher rings has been widely discussed recently as a method of achieving high luminosity under conditions of low background, and good energy resolution, with minimal demands for beam from an injecting accelerator. In the two critical areas of the technology, ring design and target development, research is very active, and the prospects for major advances are very bright. Reasonable extrapolations of the current state of the art suggest for many problems in nuclear physics, particularly polarization physics of the nucleon and few body nuclei, internal target measurement may be the optimum experimental technique. We discuss the comparative merit of internal target rings and external beam experiments, review briefly current research efforts in the critical areas of the technology. It appears that storage rings dedicated to internal target physics may offer a powerful option for future advances in nuclear physics. 14 references, 5 figures, 3 tables

  12. Impedances for electron linacs and storage rings

    International Nuclear Information System (INIS)

    Some basic concepts and results are presented concerning the impedances of electron linacs and storage rings. The impedances of an accelerator or ring completely characterizes the interaction of the beam with its environment. Not only does the impedance (or its Fourier transform, the wake potential) determine the energy loss by a bunched beam to its environment, but it is also the chief ingredient required for any calculation of beam stability

  13. Storage-ring Electron Cooler for Relativistic Ion Beams

    Energy Technology Data Exchange (ETDEWEB)

    Lin, Fanglei [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Derbenev, Yaroslav [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Douglas, David R. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Guo, Jiquan [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Johnson, Rolland P. [Muons Inc., Batavia, IL (United States); Krafft, Geoffrey A. [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Morozov, Vasiliy [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Zhang, Yuhong [Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

    2016-05-01

    Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron radiation damping of the electron beam. However, the range of ion energies where storage-ring electron cooling can be used has been limited by low electron beam damping rates at low ion energies and high equilibrium electron energy spread at high ion energies. This paper reports a development of a storage ring based cooler consisting of two sections with significantly different energies: the cooling and damping sections. The electron energy and other parameters in the cooling section are adjusted for optimum cooling of a stored ion beam. The beam parameters in the damping section are adjusted for optimum damping of the electron beam. The necessary energy difference is provided by an energy recovering SRF structure. A prototype linear optics of such storage-ring cooler is presented.

  14. Injection Control System of HLS Storage Ring

    CERN Document Server

    Liu, G; Li, W; Li Chuan; Li, K; Shang, L; Liu, Gongfa; Li, Jingyi; Li, Weimin; Li, Chuan; Li, Kaihong; Shang, Lei

    2001-01-01

    The injection control system of Hefei Light Source (HLS) storage ring is a subsystem of the upgraded HLS control system, which is based upon EPICS. Three programmable logic controllers (PLCs) are used as device controllers, which control one septum modulator and four kicker modulators of HLS storage ring. An Industrial PC is used as Input/Output Controller (IOC) and it connects the PLCs with serial communication (RS232 mode) over fibre. A PC with Linux is used as operator interface (OPI), operator application are running on it. The control system was completed in July 2000. The commissioning shows that the control system is reliable and easy operational.

  15. Injection performance evaluation for SSRF storage ring

    Science.gov (United States)

    Yang, Yong; Leng, Yong-Bin; Yan, Ying-Bing; Chen, Zhi-Chu

    2015-09-01

    The injection performance of the storage ring is one of the most important factors to consider at a synchrotron radiation facility, especially in the top-up mode. To evaluate the injection performance of the storage ring at the Shanghai Synchrotron Radiation Facility, we have built a bunch-by-bunch position measuring system based on an oscilloscope Input/Output Controller. Accurate assessment of energy mismatching, distribution of residual oscillation, and angle error of injection kickers can be achieved by this system. Supported by National Natural Science Foundation of China (11375255)

  16. Injection envelope matching in storage rings

    International Nuclear Information System (INIS)

    The shape and size of the transverse phase space injected into a storage ring can be deduced from turn-by-turn measurements of the transient behavior of the beam envelope in the ring. Envelope oscillations at 2 x the β-tron frequency indicate the presence of a β-mismatch, while envelope oscillations at the β-tron frequency are the signature of a dispersion function mismatch. Experiments in injection optimization using synchrotron radiation imaging of the beam and a fast-gated camera at the SLC damping rings are reported

  17. Geodetic concept for the storage ring EUTERPE

    International Nuclear Information System (INIS)

    At present a 400 MeV electron storage ring EUTERPE is being developed at the Eindhoven Univ. of Tech. (EUT). It is a University project, set up for studies of beam dynamics, applications of synchrotron radiation and for the education of students in this field. The circumference of the ring is approx. 40 m with 12 dipoles and 32 quadrupoles. The critical wavelength of the emitted photon spectrum is 8.3 nm for the regular dipoles. The major ring components are being constructed at the University Central Design and Engineering Facilities. The concept of the geodetical system and the instrumentation are briefly described

  18. Positron injectors for high-luminosity storage-ring colliders

    International Nuclear Information System (INIS)

    This paper reports on high-luminosity B-factories utilizing storage rings operating at unequal energies which require high-energy, low-emittance sources of positrons, and electrons suitable to fill the storage rings. As an example, consider the proposed characteristics of a collider with a luminosity of 1034 cm-2s-1 using the PEP facility at SLAC as studied by LBL (Apiary-III) and summarized. The collider consists of two rings, a large 9-GeV ring (PEP or a modification thereof) plus a 3.1-GeV ring of one-third the circumference, each with a circulating current of 3 A. Ideally, the time to fill the positron ring should be much shorter than the luminosity lifetime (set by the size of the low-energy ring). Since the luminosity lifetime of the collider is not expected to be very high, the PEP-based B-factory should have a powerful, dedicated injector. In the estimate of the characteristics of the injection system the maximum time for a complete fill of the positron ring is taken as ∼100 seconds. In the design of the injection system several choices are possible: injection by linacs at full energy of the rings or use of an intermediate booster synchrotron; accelerating e+ and e- to high energy using conventional linacs or using high-gradient linacs plus gigawatt power RF-sources being developed for linear colliders; and using a conventional (warm magnet) damping ring for cooling the positron beam at an intermediate energy or a full energy ring with a radius equal to that of the low-energy ring

  19. B-factory storage ring design

    International Nuclear Information System (INIS)

    In the past few years a good deal of enthusiasm has arisen in the US, Europe and Asia for B-Factories. In these machines electrons and positrons are collided with center-of-mass energies at or near the Υ(4s) resonance, with unprecedented high luminosities, to produce copious fluxes of B-mesons. The object is to make high-precision studies of the CP non-conserving B decays. Various colliding-beam configurations have been suggested including both linear colliders and storage rings, but one scheme has emerged as generally preferable to the others. It is the asymmetric storage ring system-asymmetric in the sense that the two beam energies are markedly different and the center of mass is moving in the direction of the higher energy beam. With this arrangement the decaying B-mesons fly off from the interaction region in the same direction, and the time-order of their decays can be deduced from the locations of their decay vertices. These B-Factories present the accelerator builder with two main challenges: to achieve luminosity far beyond that attained in existing storage rings and to do it in the unexplored arena of unequal beam energies. Fortunately the means of meeting these challenges appear to be in hand on the basis of the present understanding of the accelerator physics of colliding-beam storage rings. The problems have been studied in several laboratories in Europe, Japan, the US and the USSR, and the solutions devised in those studies have converged in their general features. A B-Factory will consist of two separate storage rings with a common collision region; each ring will carry what it, by today's standards, high circulating beam currents, and as a consequence, the vacuum chambers will be very well-cooled and strongly vacuum-pumped; and mechanical designs of the interaction regions will be quite complicated, but also quite feasible

  20. Electron Storage Ring Development for ICS Sources

    Energy Technology Data Exchange (ETDEWEB)

    Loewen, Roderick [Lyncean Technologies, Inc., Palo Alto, CA (United States)

    2015-09-30

    There is an increasing world-wide interest in compact light sources based on Inverse Compton Scattering. Development of these types of light sources includes leveraging the investment in accelerator technology first developed at DOE National Laboratories. Although these types of light sources cannot replace the larger user-supported synchrotron facilities, they offer attractive alternatives for many x-ray science applications. Fundamental research at the SLAC National Laboratory in the 1990’s led to the idea of using laser-electron storage rings as a mechanism to generate x-rays with many properties of the larger synchrotron light facilities. This research led to a commercial spin-off of this technology. The SBIR project goal is to understand and improve the performance of the electron storage ring system of the commercially available Compact Light Source. The knowledge gained from studying a low-energy electron storage ring may also benefit other Inverse Compton Scattering (ICS) source development. Better electron storage ring performance is one of the key technologies necessary to extend the utility and breadth of applications of the CLS or related ICS sources. This grant includes a subcontract with SLAC for technical personnel and resources for modeling, feedback development, and related accelerator physics studies.

  1. Storage rings for nuclear physics

    International Nuclear Information System (INIS)

    This paper provides a brief tutorial for the physicist who is not an accelerator expert, introducing terminology and concepts useful in understanding the basic properties of beam storage devices and the beam processing that they make possible. It also deals with performance- limiting phenomena: stored beam intensity limits; beam target interactions and their effects on target thickness and beam quality; and the luminosity domains at different energies and for various ion species for applicability of the stored beam technology. Examples are presented from among facilities in operation or under construction to show some of the diversity of this rapidly evolving field. A glossary of terms and abbreviations used in this review is included for the reader's convenience

  2. Diffraction-limited storage-ring vacuum technology

    International Nuclear Information System (INIS)

    A compact lattice and small magnet apertures will be the main characteristics of future diffraction-limited storage rings, adding difficulties for the design of the vacuum system of these machines. The use of NEG coatings and distributed absorbers could provide a solution to overcome these challenges. Some of the characteristics of recent ultralow-emittance storage-ring designs and possibly future diffraction-limited storage rings are a compact lattice combined with small magnet apertures. Such requirements present a challenge for the design and performance of the vacuum system. The vacuum system should provide the required vacuum pressure for machine operation and be able to handle the heat load from synchrotron radiation. Small magnet apertures result in the conductance of the chamber being low, and lumped pumps are ineffective. One way to provide the required vacuum level is by distributed pumping, which can be realised by the use of a non-evaporable getter (NEG) coating of the chamber walls. It may not be possible to use crotch absorbers to absorb the heat from the synchrotron radiation because an antechamber is difficult to realise with such a compact lattice. To solve this, the chamber walls can work as distributed absorbers if they are made of a material with good thermal conductivity, and distributed cooling is used at the location where the synchrotron radiation hits the wall. The vacuum system of the 3 GeV storage ring of MAX IV is used as an example of possible solutions for vacuum technologies for diffraction-limited storage rings

  3. Chromatic corrections for large storage rings

    International Nuclear Information System (INIS)

    The use of achromat concept (1) to facilitate chromatic corrections in large storage rings is illustrated. The example given in this report is a lattice for a 75 GeV/c ring with six interaction regions having a beta x = 1.6 m, a beta y = 0.1 m and a luminosity of 1.4 1032 cm-2s-1. The chromatic corrections are done with four families of sextupoles, two for each transverse plane, the strengths of which are determined by the solution of four linear equations in four unknowns. The basic simplicity of the method allows on-line control of the sextupole adjustments

  4. CRYRING - a synchrotron, cooler and storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Abrahamsson, K.; Andler, G.; Bagge, L.; Beebe, E.; Carle, P.; Danared, H.; Egnell, S.; Ehrnsten, K.; Engstroem, M.; Herrlander, C.J.; Hilke, J.; Jeansson, J.; Kaellberg, A.; Leontein, S.; Liljeby, L.; Nilsson, A.; Paal, A.; Rensfelt, K.G.; Rosengaard, U.; Simonsson, A.; Soltan, A.; Starker, J.; Ugglas, M. (Manne Siegbahn Inst. of Physics, Stockholm (Sweden)) Filevich, A. (CNEA, Physics Dept., Tandar, Buenos Aires (Argentina))

    1993-06-01

    CRYRING is a small synchrotron and storage ring equipped with electron cooling. Highly charged ions from the electron beam ion source CRYSIS or singly charged ions from the plasmatron source MINIS are injected via an RFQ into the ring. The facility is in the commissioning phase. Full design energy has been achieved and electron cooling demonstrated both for atomic and molecular ions. The experimental program started in August with two projects, dissociative recombination of H[sup +][sub 3] ions and radiative recombination to deuterons. The status as of September 20, 1992, is reported. (orig.)

  5. Recent results of the ACO storage ring

    International Nuclear Information System (INIS)

    A permanent magnet undulator has been built and installed on the ACO Storage Ring. The undulator design, the spontaneous emission and gain of the system, as well as the laser induced bunch lengthening of the electron bunch, are presented. A low-loss optical cavity has been also recently built and operated on the ring. Its performance and the degradation problems of the mirrors are discussed. Amplification of the spontaneous emission stored in the optical cavity has been observed. Also, preliminary results on the operation of an optical klystron are reported and interpreted

  6. Storage-ring Electron Cooler for Relativistic Ion Beams

    CERN Document Server

    Lin, F; Douglas, D; Guo, J; Johnson, R P; Krafft, G; Morozov, V S; Zhang, Y

    2016-01-01

    Application of electron cooling at ion energies above a few GeV has been limited due to reduction of electron cooling efficiency with energy and difficulty in producing and accelerating a high-current high-quality electron beam. A high-current storage-ring electron cooler offers a solution to both of these problems by maintaining high cooling beam quality through naturally-occurring synchrotron radiation damping of the electron beam. However, the range of ion energies where storage-ring electron cooling can be used has been limited by low electron beam damping rates at low ion energies and high equilibrium electron energy spread at high ion energies. This paper reports a development of a storage ring based cooler consisting of two sections with significantly different energies: the cooling and damping sections. The electron energy and other parameters in the cooling section are adjusted for optimum cooling of a stored ion beam. The beam parameters in the damping section are adjusted for optimum damping of the...

  7. Smoothing analysis of HLSII storage ring magnets

    CERN Document Server

    Wang, Wei; Tang, Zheng; Yao, Qiu-Yang

    2016-01-01

    In order to improve the quality and stability of synchrotron light, Hefei Light Source has a major upgrade. Higher accuracy is necessary for installation and alignment of the storage ring magnets. It is not necessarily essential that the magnets are positioned exactly. In fact, the aim is to adjust neighboring magnets with a high accuracy to one another; in other words, these neighboring magnets are positioned on a smoothing curve. The paper presents an attempt to develop a reliable smoothing method based on curve fitting of least squares and iteration according to the structure characteristics of HLSII. The method significantly reduces the adjusting amount and range of the storage ring magnets. It improves productivity by a factor of one times.

  8. APS storage ring vacuum system development

    International Nuclear Information System (INIS)

    The Advanced Photon Source synchrotron radiation facility, under construction at the Argonne National Laboratory, incorporates a large ring for the storage of 7 GeV positrons for the generation of photon beams for the facility's materials research program. The Storage Ring's 1104 m circumference is divided into 40 sectors which contain vacuum, beam transport, control, rf and insertion device systems. The vacuum system will operate at a pressure of 1 nTorr and is fabricated from aluminum. The system includes distributed NeG pumping, photon absorbers with lumped pumping, beam position monitors, vacuum diagnostics and valving. An overview of the vacuum system design and details of selected development program results are presented. 5 refs

  9. Free electron laser in storage rings

    International Nuclear Information System (INIS)

    Investigations on the development of a free electron laser, carried out in ACO storage ring, are reported. The emission of synchrotron radiation is obtained from the interaction of relativistic charged particles with the magnetic field of the undulator. The synchrotron radiation is stored in a cavity, where interaction with electrons occurs. From the amplification of light waves, the laser radiation is then obtained. The changes in the electron wave packets induced by LEL experiment, carried out in ACO storage ring, are reported. A better understanding of the saturation mechanism, which dictates laser equilibrium, is obtained. Experiments in Super ACO were carried out and the following topics, on the construction of the laser, were investigated: the development of an optical klystron, gain optimization, the position of the mirrors (concerning the radiation from the undulator). This work allowed the construction of a 600 MeV free electron laser, at Super ACO. The development of a laser involving UV range radiation, is considered

  10. Construction of compact electron storage ring JSR

    Science.gov (United States)

    Yokomizo, H.; Yanagida, K.; Sasaki, S.; Harami, T.; Konishi, H.; Mashiko, K.; Ashida, K.; Harada, S.; Hashimoto, H.; Iizuka, M.; Kabasawa, M.; Nakayama, K.; Yamada, K.; Suzuki, Y.

    1989-07-01

    A compact electron storage ring (JSR) is under construction in order to study accelerator technologies and to be used as the test ring aiming at a highly brilliant synchrotron radiation facility (6-8 GeV). The JSR lattice is a double-focusing achromatic type. The circumference is 20.5 m. However, even in this small ring, one straight section with a length of ˜1.5 m, where the dispersion is free, is provided for the insertion device study. The electron beam is supplied by the linac with an energy of 150 MeV, and the stored energy is slowly increased up to 300 MeV. Power supplies of all magnets and the rf system are controlled by a real-time computer through optical fiber links, and signals of beam monitors are stored in the same computer so that it is easy to test any type of control procedures.

  11. Construction of compact electron storage ring JSR

    International Nuclear Information System (INIS)

    A compact electron storage ring (JSR) is under construction in order to study accelerator technologies and to be used as the test ring aiming at a highly brilliant synchrotron radiation facility (6--8 GeV). The JSR lattice is a double-focusing achromatic type. The circumference is 20.5 m. However, even in this small ring, one straight section with a length of ∼1.5 m, where the dispersion is free, is provided for the insertion device study. The electron beam is supplied by the linac with an energy of 150 MeV, and the stored energy is slowly increased up to 300 MeV. Power supplies of all magnets and the rf system are controlled by a real-time computer through optical fiber links, and signals of beam monitors are stored in the same computer so that it is easy to test any type of control procedures

  12. Induction Accelerator Buncher for Storage Rings

    International Nuclear Information System (INIS)

    A separate induction accelerator buncher following after the storage rings is one of the options for final bunch compression. The other option is to apply the bunching voltage within the ring, but this requires a low-frequency, high gradient accelerating structure within the ring and a large aperture, which are difficult to do and undesirable. The induction accelerator buncher option here differs from the bunching function in a standard induction accelerator scenario in that here, a separate buncher is required, whereas in the induction linac the bunching function is accomplished by ramping the acceleration voltages near the end of the machine. This is a minor difference, but one that allows consideration of a bipolar buncher, which has no net acceleration. The other major difference is that the currents per beam to be bunched are smaller than in the straight induction linac, permitting use of transversely smaller, and hence less expensive, structures

  13. Astrid-2 SSC ASUMagnetic Calibration

    DEFF Research Database (Denmark)

    Primdahl, Fritz

    1997-01-01

    Report of the inter calibration between the starcamera and the fluxgate magnetometer onboard the ASTRID-2 satellite. This calibration was performed in the night between the 15. and 16. May 1997 at the Lovö magnetic observatory.......Report of the inter calibration between the starcamera and the fluxgate magnetometer onboard the ASTRID-2 satellite. This calibration was performed in the night between the 15. and 16. May 1997 at the Lovö magnetic observatory....

  14. Pulsed rf systems for large storage rings

    International Nuclear Information System (INIS)

    The possibility is considered that by using a pulsed rf system a substantial reduction can be made in the rf power requirement for the next generation of large storage rings. For a ring with a sufficiently large circumference, the time between bunch passages, T/sub b/, can exceed the cavity filling time, T/sub f/. As the ratio T/sub b//T/sub f/ increases, it is clear that at some point the average power requirement can be reduced by pulsing the rf to the cavities. In this mode of operation, the rf power is turned on a filling time or so before the arrival of a bunch and is switched off again at the time of bunch passage. There is no rf energy in the accelerating structure, and hence no power dissipation, for most of the period between bunches

  15. Introductory statistical mechanics for electron storage rings

    International Nuclear Information System (INIS)

    These lectures concentrate on statistical phenomena in electron storage rings. A stored electron beam is a dissipative, fluctuating system far from equilibrium whose mathematical description can be based upon non-equilibrium statistical mechanics. Stochastic differential equations are used to describe the quantum fluctuations of synchrotron radiation which is the main cause of randomness in electron dynamics. Fluctuating radiation reaction forces can be described via stochastic terms in Hamilton's equations of motion. Normal modes of particle motion, radiation damping effects, quantum diffusion in single-particle phase space are all discussed in this statistical formalism

  16. APS Storage Ring vacuum chamber fabrication

    International Nuclear Information System (INIS)

    The 1104-m circumference Advanced Photon Source Storage Ring Vacuum System is composed of 240 individual sections, which are fabricated from a combination of aluminum extrusions and machined components. The vacuum chambers will have 3800 weld joints, each subject to strict vacuum requirements, as well as a variety of related design criteria. The vacuum criteria and chamber design are reviewed, including a discussion of the weld joint geometries. The critical fabrication process parameters for meeting the design requirements are discussed. The experiences of the prototype chamber fabrication program are presented. Finally, the required facilities preparation for construction activity is briefly described. 6 refs., 6 figs., 1 tab

  17. Rf power saving in large storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Farkas, Z.D.

    1979-05-15

    This note considers the application of CARTOP, constant amplitude rf to pulse converter, to obtain average and peak power gains in large e/sup + -/ rings. CARTOP is a scheme where energy storage and modulation converts a continuous radio frequency (rf) wave into periodic rf pulses. A system with CARTOP is shown. The modulated rf goes through an energy storing network (ESN) that contains at least one energy storing cavity (ESC), which acts as a flywheel. Between pulses, it takes energy from the klystron and during the pulse it delivers energy to an accelerating cavity (AC).

  18. The ALS Storage Ring RF System

    International Nuclear Information System (INIS)

    The ALS Storage Ring RF System is characterized by the use of the following features: (1) High power loading of two single cell cavities. (2) The use of a tubular ceramic input window employing aperture coupling. (3) The use of waveguide filters and matchers designed for HOM absorption. (4) A comprehensive HOM monitoring system. (5) The use of waveguide water-wedge loads for the magic tee and circulator loads. The results of cavity measurements and high power tests are reported together with the performance of the system during the commissioning and operation phases of the ALS project. Plans for future window development are discussed

  19. The MAX IV storage ring project

    International Nuclear Information System (INIS)

    The design of the MAX IV 3 GeV ultralow-emittance storage ring is presented and the implementation of solutions to the technological challenges imposed by the compact multi-bend achromat lattice are described. The MAX IV facility, currently under construction in Lund, Sweden, features two electron storage rings operated at 3 GeV and 1.5 GeV and optimized for the hard X-ray and soft X-ray/VUV spectral ranges, respectively. A 3 GeV linear accelerator serves as a full-energy injector into both rings as well as a driver for a short-pulse facility, in which undulators produce X-ray pulses as short as 100 fs. The 3 GeV ring employs a multibend achromat (MBA) lattice to achieve, in a relatively short circumference of 528 m, a bare lattice emittance of 0.33 nm rad, which reduces to 0.2 nm rad as insertion devices are added. The engineering implementation of the MBA lattice raises several technological problems. The large number of strong magnets per achromat calls for a compact design featuring small-gap combined-function magnets grouped into cells and sharing a common iron yoke. The small apertures lead to a low-conductance vacuum chamber design that relies on the chamber itself as a distributed copper absorber for the heat deposited by synchrotron radiation, while non-evaporable getter (NEG) coating provides for reduced photodesorption yields and distributed pumping. Finally, a low main frequency (100 MHz) is chosen for the RF system yielding long bunches, which are further elongated by passively operated third-harmonic Landau cavities, thus alleviating collective effects, both coherent (e.g. resistive wall instabilities) and incoherent (intrabeam scattering). In this paper, we focus on the MAX IV 3 GeV ring and present the lattice design as well as the engineering solutions to the challenges inherent to such a design. As the first realisation of a light source based on the MBA concept, the MAX IV 3 GeV ring offers an opportunity for validation of concepts that are

  20. The LSU Electron Storage Ring, the first commercially-built storage ring

    International Nuclear Information System (INIS)

    The Brobeck Division of Maxwell Laboratories, Inc., is building the first industrially-produced storage ring. It will be located at Louisiana State University (LSU) at the Center for Advanced Microstructures and Devices (CAMD) in Baton Rouge. The purpose of this electron storage ring is to provide intense beams of x-rays to advance the state-of-the-art in lithography and to permit research in a broad area. This facility consists of a 1.2 GeV, 400 mA electron storage ring with a 200 MeV linac injector. The magnet lattice is a Chasman-Green design (double-bend achromat), and the ring circumference is 55.2 meters. There are four 3.0 meter, dispersion-free straight sections, one for injection, one for the 500 MHz RF cavity, and two for possible future insertion devices. The storge ring construction project is in the detailed-design stage, and many systems are in the initial stages of fabrication. 4 figs., 1 tab

  1. Photon factory: status of storage ring

    International Nuclear Information System (INIS)

    The 2.5 GeV electron storage ring at the Photon Factory is a dedicated synchrotron radiation source. The magnet system, composed of 28 bending magnets and 58 quadrupoles, is capable of raising energy up to 3 GeV by ramping after the beam is stacked. Injection is carried out in the multi-turn scheme at pulse times as long as 1 microsecond, a revolution time of 624 nanoseconds, and a rate of 1 Hz. Four 500 MHz RF cavities are situated in the straight section. Each cell is rated to dissipate 30 kW of RF power from an RF source consisting of two 180 kW klystrons. Out of 24 possible exit ports for synchrotron radiation, seven beam lines are operational and two more are in preparation. Each line is split into three or four branch lines, to each of which an experimental station is attached. The first beam was stored at the design energy in March 1982. Experiments in synchrotron radiation were begun in June. A superconducting vertical wiggler of 5 T and a permanent magnet undulator were successfully brought into operation in February 1983. This paper assesses the design and operating experience of the storage ring over its lifetime

  2. Design Considerations for High Energy Electron -- Positron Storage Rings

    Science.gov (United States)

    Richter, B.

    1966-11-01

    High energy electron-positron storage rings give a way of making a new attack on the most important problems of elementary particle physics. All of us who have worked in the storage ring field designing, building, or using storage rings know this. The importance of that part of storage ring work concerning tests of quantum electrodynamics and mu meson physics is also generally appreciated by the larger physics community. However, I do not think that most of the physicists working tin the elementary particle physics field realize the importance of the contribution that storage ring experiments can make to our understanding of the strongly interacting particles. I would therefore like to spend the next few minutes discussing the sort of things that one can do with storage rings in the strongly interacting particle field.

  3. Storage ring development at the National Synchrotron Light Source

    International Nuclear Information System (INIS)

    This report contains papers on the following topics: Transverse Beam Profile Monitor; Bunch Length Measurements in the VUV Storage Ring; Photoelectric Effect Photon Beam Position Monitors; RF Receivers for Processing Electron Beam Pick-up Electrode Signals; Real-Time Global Orbit Feedback Systems; Local Orbit Feedback; Active Interlock System for High Power Insertion Devices in the X-ray Ring; Bunch Lengthening Cavity for the VUV Ring; SXLS Storage Ring Design

  4. Stochastic beam dynamics in storage rings

    International Nuclear Information System (INIS)

    In this thesis several approaches to stochastic dynamics in storage rings are investigated. In the first part the theory of stochastic differential equations and Fokker-Planck equations is used to describe the processes which have been assumed to be Markov processes. The mathematical theory of Markov processes is well known. Nevertheless, analytical solutions can be found only in special cases and numerical algorithms are required. Several numerical integration schemes for stochastic differential equations will therefore be tested in analytical solvable examples and then applied to examples from accelerator physics. In particular the stochastically perturbed synchrotron motion is treated. For the special case of a double rf system several perturbation theoretical methods for deriving the Fokker-Planck equation in the action variable are used and compared with numerical results. The second part is concerned with the dynamics of electron storage rings. Due to the synchrotron radiation the electron motion is influenced by damping and exciting forces. An algorithm for the computation of the density function in the phase space of such a dissipative stochastically excited system is introduced. The density function contains all information of a process, e.g. it determines the beam dimensions and the lifetime of a stored electron beam. The new algorithm consists in calculating a time propagator for the density function. By means of this propagator the time evolution of the density is modelled very computing time efficient. The method is applied to simple models of the beam-beam interaction (one-dimensional, round beams) and the results of the density calculations are compared with results obtained from multiparticle tracking. Furthermore some modifications of the algorithm are introduced to improve its efficiency concerning computing time and storage requirements. Finally, extensions to two-dimensional beam-beam models are described. (orig.)

  5. Characterization of a new electrostatic storage ring for photofragmentation experiments

    International Nuclear Information System (INIS)

    We describe the design of and the first commissioning experiments with a newly constructed electrostatic storage ring named SAPHIRA (Storage Ring in Aarhus for PHoton-Ion Reaction Analysis). With an intense beam of Cu− at 4 keV, the storage ring is characterized in terms of the stored ion beam decay rate, the longitudinal spreading of an injected ion bunch, as well as the direct measurements of the transverse spatial distributions under different conditions of storage. The ion storage stability in SAPHIRA was investigated systematically in a selected region of its electrical configuration space

  6. Introductory statistical mechanics for electron storage rings

    International Nuclear Information System (INIS)

    These lectures introduce the beam dynamics of electron-positron storage rings with particular emphasis on the effects due to synchrotron radiation. They differ from most other introductions in their systematic use of the physical principles and mathematical techniques of the non-equilibrium statistical mechanics of fluctuating dynamical systems. A self-contained exposition of the necessary topics from this field is included. Throughout the development, a Hamiltonian description of the effects of the externally applied fields is maintained in order to preserve the links with other lectures on beam dynamics and to show clearly the extent to which electron dynamics in non-Hamiltonian. The statistical mechanical framework is extended to a discussion of the conceptual foundations of the treatment of collective effects through the Vlasov equation

  7. Introductory statistical mechanics for electron storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Jowett, J.M.

    1986-07-01

    These lectures introduce the beam dynamics of electron-positron storage rings with particular emphasis on the effects due to synchrotron radiation. They differ from most other introductions in their systematic use of the physical principles and mathematical techniques of the non-equilibrium statistical mechanics of fluctuating dynamical systems. A self-contained exposition of the necessary topics from this field is included. Throughout the development, a Hamiltonian description of the effects of the externally applied fields is maintained in order to preserve the links with other lectures on beam dynamics and to show clearly the extent to which electron dynamics in non-Hamiltonian. The statistical mechanical framework is extended to a discussion of the conceptual foundations of the treatment of collective effects through the Vlasov equation.

  8. Pulsed rf systems for large storage rings

    International Nuclear Information System (INIS)

    In this note we consider the possibility that by using a pulsed rf system, perhaps a system which operates at a somewhat higher frequency, a substantial reduction can be made in the rf power requirement for the next generation of large storage rings. A large effort over a period of many years has been expended in the attempt to increase the shunt impedance of rf structures for cw systems. Without turning to superconductivity only modest gains in the shunt impedance remain to be made by further detailed adjustments in cell shape. On the other hand, very little effort has as yet gone into the optimization of structures for pulsed systems. The structure parameters to be quoted in this report do not therefore necessarily represent values close to those for an optimum design. It is expected that the system designs set out here can be improved upon with further experimental and theoretical work. 11 refs., 3 figs

  9. Design of double storage rings at MUSES

    International Nuclear Information System (INIS)

    Double storage rings (DSR) will play a role to perform various experiments of collision or merging of radio-isotope beams with ions, electron beams and X-rays produced from an undulator. The experiments will be performed at two crossing points. One is for collision of RI beam with electron with crossing angle 20 mrad. Another is for merging for ion beams with angle of 170 mrad. To perform these experiments with high luminosity, electron beam has two different operation modes. The emittance of 10-6 m*rad is prepared for the collision with RI and that of 10-8 m*rad is done for production of high brilliant X-ray. (author)

  10. Unicell structure for superconducting storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Danby, G.; DeVito, B.; Jackson, J.; Keohane, G.; Lee, Y.Y.; Phillips, R.; Plate, S.; Repeta, L.; Skaritka, J.; Smith, L.

    1985-01-01

    Mechanically integrated, magnetically decoupled storage rings were designed for a heavy ion collider for 100 GeV/amu Au, at B = 2.7T. New concepts were developed, including detailed engineering design and cost estimates. A ''unicell'' contains a half-cell of both rings within a single He vessel. The unicell design is optimized for economical mass production. Survey pads welded to the laminations provide external fiducials to locate the magnet cores. Roller bearing self aligning supports accommodate cool-down shrinkage. The design tolerates relative motion of components resulting from longitudinal shrinkage in the approx.15 m long unicell without affecting performance. Magnetic and physical lengths are the same, eliminating waste space. ''Achromatic'' quadrupoles with sextupoles at both ends are located on a common precision beam tube which aligns and supports a pick-up electrode. The unicell accommodates longer dipoles compared to conventional designs, reducing B/sub max/, stored energy, and the volume of iron and superconductor. Applications to future machines will be discussed.

  11. Unicell structure for superconducting storage rings

    International Nuclear Information System (INIS)

    Mechanically integrated, magnetically decoupled storage rings were designed for a heavy ion collider for 100 GeV/amu Au, at B = 2.7T. New concepts were developed, including detailed engineering design and cost estimates. A ''unicell'' contains a half-cell of both rings within a single He vessel. The unicell design is optimized for economical mass production. Survey pads welded to the laminations provide external fiducials to locate the magnet cores. Roller bearing self aligning supports accommodate cool-down shrinkage. The design tolerates relative motion of components resulting from longitudinal shrinkage in the approx.15 m long unicell without affecting performance. Magnetic and physical lengths are the same, eliminating waste space. ''Achromatic'' quadrupoles with sextupoles at both ends are located on a common precision beam tube which aligns and supports a pick-up electrode. The unicell accommodates longer dipoles compared to conventional designs, reducing B/sub max/, stored energy, and the volume of iron and superconductor. Applications to future machines will be discussed

  12. Ensomheden i Astrid Lindgrens forfatterskab

    OpenAIRE

    Steen, Nicoline Søeborg; Bjørn, Marlene Kæregaard; Nielsen, Ida Signe Koefoed

    2016-01-01

    This project centers on an interest in loneliness and solitude in the writings of Astrid Lindgren. The paper begins by describing the history of children’s literature and the view of the child in children’s literature, but soon moves on to present the concept of loneliness in philosophy and literary studies. The analysis takes its starting point in three works by Astrid Lindgren: Mio, My Son (1954), The Brothers Lionheart (1973) and Ronia the Robber’s Daughter (1981). The analysis focuses ...

  13. Measurement of storage ring motion at the advanced light source

    International Nuclear Information System (INIS)

    The mechanical stability of the Advanced Light Source storage ring is examined over a period of 1.5 years from the point of view of floor motion. The storage ring beam position monitor stability is examined under various operating conditions

  14. Study of ion trapping phenomena in Indus-2 storage ring

    International Nuclear Information System (INIS)

    Electron beam in a synchrotron or storage ring ionizes the residual gas molecules present inside its vacuum chamber. These positive ions are trapped in the negative potential well of electron beam and limit the performance of the electron storage ring. During the commissioning of the Indus-2 storage ring, some features have shown up which may be related to ion trapping. In many storage rings, introduction of one long bunch gap in the stored beams has been found to be very effective in avoiding problems caused by ions. In this paper we discuss the phenomenon of ion trapping and its possible cure by optimization of the bunch gaps in Indus-2 storage ring. A suitable bunch-filling pattern with a single long gap appears suitable for Indus-2. (author)

  15. Central frequency measurement of the HLS-II storage ring

    CERN Document Server

    Zheng, Jiajun; Sun, Baogen; Wu, Fangfang; Cheng, Chaocai; Tang, Kai

    2015-01-01

    Central frequency is a key parameter of storage rings. This paper presents the measurement of central frequency of the HLS-II storage ring using the sextupole modulation method. Firstly, the basis of central frequency measurement of the electron storage ring is briefly introduced. Then, the error sources and the optimized measurement method for the HLS-II storage ring are discussed. The workflow of the self-compiled Matlab script used in central frequency measurement is also described. In the end, the results achieved by using two methods to cross-check each other are shown. The measured value of the central frequency demonstrates that the real circumference of the HLS-II storage ring agrees well with the designed value.

  16. VUV optical ring resonator for Duke storage ring free electron laser

    Energy Technology Data Exchange (ETDEWEB)

    Park, S.H.; Litvinenko, V.N.; Madey, J.M.J. [Duke Univ., Durham, NC (United States)] [and others

    1995-12-31

    The conceptual design of the multifaceted-mirror ring resonator for Duke storage ring VUV FEL is presented. The expected performance of the OK-4 FEL with ring resonator is described. We discuss in this paper our plans to study reflectivity of VUV mirrors and their resistivity to soft X-ray spontaneous radiation from OK-4 undulator.

  17. The proton storage ring: Problems and solutions

    International Nuclear Information System (INIS)

    The Los Alamos Proton Storage Ring (PSR) now operates with 35μA at 20-Hz pulse repetition rate. Beam availability during 1988 suffered because of a number of problems with hardware reliability and from narrow operating margins for beam spill in the extraction line. A strong effort is underway to improve reliability with an eventual goal of obtaining beam availability in excess of 75%. Beam losses and the resulting component activation have limited operating currents to their present values. In detailed studies of the problem, loss rates were found to be approximately proportional to the circulating current and can be understood by a detailed accounting of emittance growth in the two-step injection process along with Coulomb scattering of the stored beam during multiple traversals of the injection foil. It is now apparent that the key to reducing losses is in reducing the number of foil traversals. A program of upgrades to reduce losses and improve the operating current is being planned. 8 refs., 17 figs., 2 tabs

  18. Two level triggering in storage ring experiments

    International Nuclear Information System (INIS)

    Cylindrical storage ring detectors using more then tenthousand channels of drift-, proportional- and liquid argon chambers have led to an enormous increase in data acquisition rates stored in hundreds of tapes. To reduce the computer time for total analysis of the selected events one has to reject the undesired events as early as possible. Therefore the trigger should be more selective, i.e. not only by counting the number of tracks in an event but to reconstruct the track coordinates to get to know the topology. Because of the short decision time of some microseconds in typical PETRA/DORIS experiments this is done in two steps: at level 1 a parallel or sequential hardwired logic is used for getting the number of tracks together with some geometrical values, at level 2 a fast or several slower microprocessors are used running on a simple algorithm together with some hardware tricks. For future detectors with lower bunch crossing rates very fast microprocessors may be used also at the first level, at the second level more efficient algorithms are now designed and under test. (orig.)

  19. Status of PSR [Proton Storage Ring

    International Nuclear Information System (INIS)

    The Los Alamos Proton Storage Ring (PSR) now operates with 35μA at 20-Hz pulse repetition rate. Beam availability during 1988 suffered because of a number of problems with hardware reliability and from narrow operating margins for beam spill in the extraction line. A strong effort is underway to improve reliability with an eventual goal of obtaining beam availability in excess of 75%. Beam losses and the resulting component activation have limited operating currents to their present values. In detailed studies of the problem, loss rates were found to be approximately proportional to the circulating current and can be understood by a detailed accounting of emittance growth in the two-step injection process along with Coulomb scattering of the stored beam during multiple traversals of the injection foil. It is now apparent that the key to reducing losses is in reducing the number of foil traversals. A program of upgrades to reduce losses and improve the operating current is being planned. 8 refs., 16 figs

  20. Survey and alignment of the Fermilab recycler antiproton storage ring

    International Nuclear Information System (INIS)

    In June of 1999 Fermilab commissioned a newly constructed antiproton storage ring, the 'Recycler Ring', in the Main Injector tunnel directly above the Main Injector beamline. The Recycler Ring is a fixed 8 GeV kinetic energy storage ring and is constructed of strontium ferrite permanent magnets. The 3319.4-meter-circumference Recycler Ring consists of 344 gradient magnets and 100 quadrupoles all of which are permanent magnets. This paper discusses the methods employed to survey and align these permanent magnets within the Recycler Ring with the specified accuracy. The Laser Tracker was the major instrument used for the final magnet alignment. The magnets were aligned along the Recycler Ring with a relative accuracy of ±0.25 mm. (author)

  1. SOR-RING: an electron storage ring dedicated to spectroscopy, 1

    International Nuclear Information System (INIS)

    An electron storage ring dedicated to the vacuum ultraviolet spectroscopy in the wavelength region above 40 A has been designed. The ring is expected to operate at 300 MeV and 100 mA. Electrons with the energy of 300 MeV are extracted from a 1.3 GeV electron synchrotron at Institute for Nuclear Study(INS) and injected into the ring. The ring is essentially a weak focusing machine with an adjustable operating point. Various parameters of the ring are shown. The design principle is described in connection with the important parts of the ring. (auth.)

  2. Calibration of the linear optics in the SSRF storage ring

    Institute of Scientific and Technical Information of China (English)

    TIAN Shunqiang; LIU Guimin; ZHANG Wenzhi; LI Haohu; ZHANG Manzhou; HOU Jie; CHEN Guangling

    2008-01-01

    Phase Ⅰ commissioning of the SSRF storage ring at 3.0 GeV was ended with encouraging results. Distortions and calibrations of the linear optics during the storage ring commissioning are discussed in this paper. The calibration procedure has reduced sextupole-additional focusing effects by minimizing closed orbit deviation and corrected quadrupole magnetic coefficients with the linear optics from closed orbit (LOCO) technique. After fitting the closed orbit response matrix, linear optics of the storage ring is substantially corrected, and the measured parameters agree well with the design. Four optics modes were commissioned, and relevant machine physics studies were carried out. Their results are summarized.

  3. Online optimization of storage ring nonlinear beam dynamics

    CERN Document Server

    Huang, Xiaobiao

    2015-01-01

    We propose to optimize the nonlinear beam dynamics of existing and future storage rings with direct online optimization techniques. This approach may have crucial importance for the implementation of diffraction limited storage rings. In this paper considerations and algorithms for the online optimization approach are discussed. We have applied this approach to experimentally improve the dynamic aperture of the SPEAR3 storage ring with the robust conjugate direction search method and the particle swarm optimization method. The dynamic aperture was improved by more than 5 mm within a short period of time. Experimental setup and results are presented.

  4. Online optimization of storage ring nonlinear beam dynamics

    Science.gov (United States)

    Huang, Xiaobiao; Safranek, James

    2015-08-01

    We propose to optimize the nonlinear beam dynamics of existing and future storage rings with direct online optimization techniques. This approach may have crucial importance for the implementation of diffraction limited storage rings. In this paper considerations and algorithms for the online optimization approach are discussed. We have applied this approach to experimentally improve the dynamic aperture of the SPEAR3 storage ring with the robust conjugate direction search method and the particle swarm optimization method. The dynamic aperture was improved by more than 5 mm within a short period of time. Experimental setup and results are presented.

  5. Storage ring mass spectrometry for nuclear structure and astrophysics research

    Science.gov (United States)

    Zhang, Y. H.; Litvinov, Yu A.; Uesaka, T.; Xu, H. S.

    2016-07-01

    In the last two and a half decades ion storage rings have proven to be powerful tools for precision experiments with unstable nuclides in the realm of nuclear structure and astrophysics. There are presently three storage ring facilities in the world at which experiments with stored radioactive ions are possible. These are the ESR in GSI, Darmstadt/Germany, the CSRe in IMP, Lanzhou/China, and the R3 storage ring in RIKEN, Saitama/Japan. In this work, an introduction to the facilities is given. Selected characteristic experimental results and their impact in nuclear physics and astrophysics are presented. Planned technical developments and the envisioned future experiments are outlined.

  6. Physics issues in diffraction limited storage ring design

    Science.gov (United States)

    Fan, Wei; Bai, ZhengHe; Gao, WeiWei; Feng, GuangYao; Li, WeiMin; Wang, Lin; He, DuoHui

    2012-05-01

    Diffraction limited electron storage ring is considered a promising candidate for future light sources, whose main characteristics are higher brilliance, better transverse coherence and better stability. The challenge of diffraction limited storage ring design is how to achieve the ultra low beam emittance with acceptable nonlinear performance. Effective linear and nonlinear parameter optimization methods based on Artificial Intelligence were developed for the storage ring physical design. As an example of application, partial physical design of HALS (Hefei Advanced Light Source), which is a diffraction limited VUV and soft X-ray light source, was introduced. Severe emittance growth due to the Intra Beam Scattering effect, which is the main obstacle to achieve ultra low emittance, was estimated quantitatively and possible cures were discussed. It is inspiring that better performance of diffraction limited storage ring can be achieved in principle with careful parameter optimization.

  7. A precision luminosity monitor for electron-positron storage rings

    International Nuclear Information System (INIS)

    A very accurate luminosity monitor for an e+e- storage ring experiment has been built and successfully operated. The systematic error on the measured luminosity is estimated to be approximately 0.6%. (orig.)

  8. On the Astrid asteroid family

    CERN Document Server

    Carruba, V

    2016-01-01

    Among asteroid families, the Astrid family is peculiar because of its unusual inclination distribution. Objects at $a\\simeq$~2.764 au are quite dispersed in this orbital element, giving the family a "crab-like" appearance. Recent works showed that this feature is caused by the interaction of the family with the $s-s_C$ nodal secular resonance with Ceres, that spreads the inclination of asteroids near its separatrix. As a consequence, the currently observed distribution of the $v_W$ component of terminal ejection velocities obtained from inverting Gauss equation is quite leptokurtic, since this parameter mostly depends on the asteroids inclination. The peculiar orbital configuration of the Astrid family can be used to set constraints on key parameters describing the strength of the Yarkovsky force, such as the bulk and surface density and the thermal conductivity of surface material. By simulating various fictitious families with different values of these parameters, and by demanding that the current value of ...

  9. Estimates of CSR Instability Thresholds for Various Storage Rings

    CERN Document Server

    Zimmermann, Frank

    2010-01-01

    We review the key predictions and conditions by several authors for the onset of longitudinal instabilities due to coherent synchrotron radiation (CSR), and evaluate them numerically for various storage rings, namely the KEKB High Energy Ring (HER) & Low Energy Ring (LER), SuperKEKB HER & LER, old and new designs of the SuperKEKB Damping Ring (DR), SuperB HER & LER, CLIC DR (2009 and 2010 design parameters), SLC DR, and ATF DR. We show that the theoretical uncertainty in the instability onset is at least at the level of 20-30% in bunch intensity. More importantly, we present some doubts about the general applicability for many of these storage rings of some commonly used formulae. To cast further light on these questions, an experiment at lower beam energy on the ATF Damping Ring is proposed.

  10. On the Astrid asteroid family

    Science.gov (United States)

    Carruba, V.

    2016-09-01

    Among asteroid families, the Astrid family is peculiar because of its unusual inclination distribution. Objects at a ≃ 2.764 au are quite dispersed in this orbital element, giving the family a `crab-like' appearance. Recent works showed that this feature is caused by the interaction of the family with the s - sC nodal secular resonance with Ceres, that spreads the inclination of asteroids near its separatrix. As a consequence, the currently observed distribution of the vW component of terminal ejection velocities obtained from inverting Gauss equation is quite leptokurtic, since this parameter mostly depends on the asteroids inclination. The peculiar orbital configuration of the Astrid family can be used to set constraints on key parameters describing the strength of the Yarkovsky force, such as the bulk and surface density and the thermal conductivity of surface material. By simulating various fictitious families with different values of these parameters, and by demanding that the current value of the kurtosis of the distribution in vW be reached over the estimated lifetime of the family, we obtained that the thermal conductivity of Astrid family members should be ≃0.001 W m-1 K-1, and that the surface and bulk density should be higher than 1000 kg m-3. Monte Carlo methods simulating Yarkovsky and stochastic Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) evolution of the Astrid family show its age to be T = 140 ± 30 Myr old, in good agreement with estimates from other groups. Its terminal ejection velocity parameter is in the range V_{EJ}= 5^{+17}_{-5} m s-1. Values of VEJ larger than 25 m s-1 are excluded from constraints from the current inclination distribution.

  11. Coupled beam motion in a storage ring with crab cavities

    Energy Technology Data Exchange (ETDEWEB)

    Huang, Xiaobiao [SLAC National Accelerator Lab., Menlo Park, CA (United States)

    2015-11-16

    We studied the coupled beam motion in a storage ring between the transverse and longitudinal directions introduced by crab cavities. Analytic form of the linear decoupling transformation is derived. Also, the equilibrium bunch distribution in an electron storage ring with a crab cavity is given, including contribution to the eigen-emittance induced by the crab cavity. Application to the short pulse generation scheme using crab cavities [1] is considered.

  12. Some topics in beam dynamics of storage rings

    International Nuclear Information System (INIS)

    In the following report we want to review some beam dynamics problems in accelerator physics. Theoretical tools and methods are introduced and discussed, and it is shown how these concepts can be applied to the study of various problems in storage rings. The first part treats Hamiltonian systems (proton accelerators) whereas the second part is concerned with explicitly stochastic systems (e.g. electron storage rings). (orig.)

  13. Electron Storage Ring For The Compact X-ray Source

    CERN Document Server

    Poseryaev, A V; Shvedunov, V I

    2004-01-01

    Lattice design of a compact storage ring for laser-electron X-ray generator at the energy 45 Mev is discussed. A quasi-monochromatic X-ray radiation is produced in the process of Compton backscattering of laser photons by counter propagating relativistic electrons. Requirements to characteristics of the electron beam and lattice structure are formulated. The basic parameters of the storage ring are listed.

  14. The SLS storage ring support and alignment systems

    CERN Document Server

    Zelenika, S; Rivkin, L; Rohrer, M; Rossetti, D; Ruland, R; Schlott, V; Streun, A; Wiegand, Peter

    2001-01-01

    Storage rings of third generation synchrotron radiation facilities pose severe challenges for lowering the beam emittances and increasing the lifetimes, requiring thus increasing positioning and alignment precisions that must be preserved over long time spans. This work describes the SLS storage ring mechanical support, alignment and disturbances compensation systems that allow to meet these requirements. In particular, their design, the tests done on the respective prototypes and the applicability of the developed arrangement to beam-based alignment are addressed.

  15. Thermal analysis of the beam missteering in APS storage ring

    International Nuclear Information System (INIS)

    Several bending magnet beam missteering cases have been investigated for the 7-GeV storage ring of the Advanced Photon Source (APS). One of the critical missteering events is presented in this paper. Finite element analyses are performed to solve for both temperature and stress fields. Thermally induced deflections are determined by using beam bending theory. A safe current limit is established for the storage ring chambers

  16. Coupled beam motion in a storage ring with crab cavities

    CERN Document Server

    Huang, Xiaobiao

    2015-01-01

    We studied the coupled beam motion in a storage ring between the transverse and longitudinal directions introduced by crab cavities. Analytic form of the linear decoupling transformation is derived. The equilibrium bunch distribution in an electron storage ring with a crab cavity is given, including contribution to the eigen-emittance induced by the crab cavity. Application to the short pulse generation scheme using crab cavities is considered.

  17. Coupled beam motion in a storage ring with crab cavities

    Science.gov (United States)

    Huang, Xiaobiao

    2016-02-01

    We studied the coupled beam motion in a storage ring between the transverse and longitudinal directions introduced by crab cavities. The analytic form of the linear decoupling transformation is derived. The equilibrium bunch distribution in an electron storage ring with a crab cavity is given, including contribution to the eigenemittance induced by the crab cavity. Application to the short pulse generation scheme using crab cavities is considered.

  18. Injection performance evaluation for storage ring of SSRF

    CERN Document Server

    Yang, Yong; Yan, Ying-Bing; Chen, Zhi-Chu

    2014-01-01

    Injection performance of storage ring is one of the important factors for the light efficiency and quality of Synchrotron Radiation Facility when it is in top-up mode. To evaluate the injection performance of storage ring at SSRF, we build a bunch-by-bunch position measuring system based on oscilloscope IOC. Accurate assessment of energy mismatching, distribution of residual oscillation and angle error of injection kickers can be achieved by this system.

  19. General Spin Precession and Betatron Oscillation in Storage Ring

    CERN Document Server

    Fukuyama, Takeshi

    2016-01-01

    We give the geralized expression of spin precession of extended bunch particles having both anomalous magnetic and electric dipole moments in storage ring. The transversal betatron oscillation formula of the bunch is also given. The latter is the generalization of the Farley's pitch correction \\cite{Farley}, including radial oscillation as well as vertical one. Some useful formulae for muon storage ring are discussed in appendix.

  20. Storage ring at HIE-ISOLDE Technical design report

    NARCIS (Netherlands)

    Grieser, M.; Litvinov, Yu. A.; Raabe, R.; Blaum, K.; Blumenfeld, Y.; Butler, P. A.; Wenander, F.; Woods, P. J.; Aliotta, M.; Andreyev, A.; Artemyev, A.; Atanasov, D.; Aumann, T.; Balabanski, D.; Barzakh, A.; Batist, L.; Bernardes, A. -P.; Bernhardt, D.; Billowes, J.; Bishop, S.; Borge, M.; Borzov, I.; Boston, A. J.; Brandau, C.; Catford, W.; Catherall, R.; Cederkall, J.; Cullen, D.; Davinson, T.; Dillmann, I.; Dimopoulou, C.; Dracoulis, G.; Duellmann, Ch. E.; Egelhof, P.; Estrade, A.; Fischer, D.; Flanagan, K.; Fraile, L.; Fraser, M. A.; Freeman, S. J.; Geissel, H.; Gerl, J.; Greenlees, P.; Grisenti, R. E.; Habs, D.; von Hahn, R.; Hagmann, S.; Hausmann, M.; He, J. J.; Heil, M.; Huyse, M.; Jenkins, D.; Jokinen, A.; Jonson, B.; Joss, D. T.; Kadi, Y.; Kalantar-Nayestanaki, N.; Kay, B. P.; Kiselev, O.; Kluge, H. -J.; Kowalska, M.; Kozhuharov, C.; Kreim, S.; Kroell, T.; Kurcewicz, J.; Labiche, M.; Lemmon, R. C.; Lestinsky, M.; Lotay, G.; Ma, X. W.; Marta, M.; Meng, J.; Muecher, D.; Mukha, I.; Mueller, A.; Murphy, A. St J.; Neyens, G.; Nilsson, T.; Nociforo, C.; Noertershaeuser, W.; Page, R. D.; Pasini, M.; Petridis, N.; Pietralla, N.; Pfuetzner, M.; Podolyak, Z.; Regan, P.; Reed, M. W.; Reifarth, R.; Reiter, P.; Repnow, R.; Riisager, K.; Rubio, B.; Sanjari, M. S.; Savin, D. W.; Scheidenberger, C.; Schippers, S.; Schneider, D.; Schuch, R.; Schwalm, D.; Schweikhard, L.; Shubina, D.; Siesling, E.; Simon, H.; Simpson, J.; Smith, J.; Sonnabend, K.; Steck, M.; Stora, T.; Stoehlker, T.; Sun, B.; Surzhykov, A.; Suzaki, F.; Tarasov, O.; Trotsenko, S.; Tu, X. L.; Van Duppen, P.; Volpe, C.; Voulot, D.; Walker, P. M.; Wildner, E.; Winckler, N.; Winters, D. F. A.; Wolf, A.; Xu, H. S.; Yakushev, A.; Yamaguchi, T.; Yuan, Y. J.; Zhang, Y. H.; Zuber, K.; Bosch, F.M.

    2012-01-01

    We propose to install a storage ring at an ISOL-type radioactive beam facility for the first time. Specifically, we intend to setup the heavy-ion, low-energy ring TSR at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored secondary beams tha

  1. Beam dynamics of CANDLE storage ring low alpha operation

    Science.gov (United States)

    Sargsyan, A.; Amatuni, G.; Sahakyan, V.; Tsakanov, V.; Zanyan, G.

    2015-10-01

    The generation of the coherent THz radiation and short pulse synchrotron radiation in dedicated electron storage rings requires the study of non-standard magnetic lattices which provide low momentum compaction factor (alpha) of the ring. In the present paper two low alpha operation lattices based on modification of the original beam optics and implementation of inverse bend magnets are studied for CANDLE storage ring. For considered cases an analysis of transverse and longitudinal beam dynamics is given and the feasibility of lattices is discussed.

  2. Beam dynamics of CANDLE storage ring low alpha operation

    International Nuclear Information System (INIS)

    The generation of the coherent THz radiation and short pulse synchrotron radiation in dedicated electron storage rings requires the study of non-standard magnetic lattices which provide low momentum compaction factor (alpha) of the ring. In the present paper two low alpha operation lattices based on modification of the original beam optics and implementation of inverse bend magnets are studied for CANDLE storage ring. For considered cases an analysis of transverse and longitudinal beam dynamics is given and the feasibility of lattices is discussed

  3. Exact solutions for the spin tune for model storage rings

    CERN Document Server

    Mane, S R

    2002-01-01

    We present exact analytical expressions for the spin tune for arbitrary values of the orbital action for several storage ring models. The models we treat contain Siberian Snakes, the use of which is essential to preserve the polarization of beams in high-energy proton storage rings. Our solutions contain some novel features. We also prove a previously conjectured claim about the behavior of spin tuneshifts in rings with multiple Snakes. The conjecture is based on numerical simulations, but our proof is analytical, and also nonperturbative.

  4. Fuel Handling Systems: Some technical orientations for ASTRID project

    International Nuclear Information System (INIS)

    This article deals with the technical orientations considered for fuel handling management in ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) project. Its purpose is to present the orientations proposed by AREVA to solve the technical and economical issues involved by sodium fast neutrons reactors and by ASTRID specificities. In the reactor vessel, the fuel handling is carried out under rotating plugs by means of a direct lift charge machine and a fixed arm charge machine. To unload a minor actinide assembly as quick as required by ASTRID objectives, a sodium way has been chosen for core loading - unloading. A spent fuel/new fuel exchange device is implemented inside the reactor vessel to increase core loading - unloading efficiency and to improve the global plant availability. The technical feasibility of an external storage in sodium is discussed and a first design proposed. Management of new, spent and failed fuel from external storage to the outlet of the nuclear island is also described and a general architecture is proposed. (author)

  5. An internal polarized 3He target for electron storage rings

    International Nuclear Information System (INIS)

    We describe an internal polarized 3He target currently under construction which will be used in several electron storage ring experiments. The target is based on the technique of metastability exchange laser optical pumping, where the polarized atoms flow into a cryogenically-cooled storage cell. This novel technique allows for high precision measurements where the beam interacts with the pure atomic species. Both the HERMES experiment at DESY and the BLAST detector at the MIT Bates Laboratory will use the polarized 3He target in their measurements. Details of the target system, including the provisions needed to incorporate the target into the electron storage ring, are presented. (orig.)

  6. Design of a novel electrostatic ion storage ring at KACST

    CERN Document Server

    Ghazaly, M O A El; Welsch, C P; Alharbi, H H

    2013-01-01

    A new electrostatic storage ring for beams at energies up to 30keV.q is currently under development at the National Centre for Mathematics and Physics (NCMP), King Abdulaziz City for Science and Technology (KACST). The ring design is based on the existing electrostatic storage rings, but stretches significantly beyond them in that it shall form the core of a unique flexible experimental facility at KACST. The lattice of this ring has been designed in a way that enables the use of state-of-the-art experimental methods to study electron-ion, laser-ion, and ion-neutral beams interactions. The lattice design also allows for a future upgrade of the ring to a double storage ring structure that would enable ion-ion beam interactions to be performed. In this paper, we present the design of this ring with a focus on beam dynamics calculations for the 7o single-bend racetrack layout. The study is principally based on the SIMION8 program. We complemented this study further by using purpose-written routine and MAD-X simu...

  7. Response of APS storage ring basemat to ambient vibration

    International Nuclear Information System (INIS)

    The storage ring of the Advanced Photon Source (APS) facility at Argonne is very sensitive to vibration. Large vibration amplitudes would result in degraded machine performance. Because the storage ring assembly is supported on the storage ring basemat, the dynamics of the basemat are critical to successful operation. Before construction began, a survey of site ground vibration indicated that the site was acceptable from a vibration standpoint. When construction of the linear accelerator (Linac) floor slab and shielding walls was completed, dynamic-response measurements were conducted. The slab/wall system showed attenuation of soilborne vibrations in the horizontal directions, but an amplification (approximately a factor of 1.5) of vertical vibration at a frequency of 7.7 Hz. Vibration response of the slab/wall system at all other frequencies showed attenuation of soilborne vibrations. Dynamic-response measurements were also conducted on an incomplete section of the storage ring basemat. Although this section was not prototypical, results were similar to those of the Linac floor in the horizontal direction, showing large damping and attenuation of horizontal soilborne vibrations. While the basemat followed the soil vibration in the vertical direction, no large amplification was observed. However, measured vertical amplitudes on the basemat were a function of location, indicating a modal response. A series of vibration response measurements was conducted on a completed section of the storage ring basemat/tunnel adjacent and to the west of the Early Assembly Area (EAA) on May 21, 1992, and is the subject of this report

  8. SPARC Collaboration: New Strategy for Storage Ring Physics at FAIR

    CERN Document Server

    Stöhlker, Thomas; Bräuning-Demian, Angela; Lestinsky, Michael; Herfurth, Frank; Maier, Rudolf; Prasuhn, Dieter; Schuch, Reinhold; Steck, Markus

    2014-01-01

    SPARC collaboration at FAIR pursues the worldwide unique research program by utilizing storage ring and trapping facilities for highly-charged heavy ions. The main focus is laid on the exploration of the physics at strong, ultra-short electromagnetic fields including the fundamental interactions between electrons and heavy nuclei as well as on the experiments at the border between nuclear and atomic physics. Very recently SPARC worked out a realization scheme for experiments with highly-charged heavy-ions at relativistic energies in the High-Energy Storage Ring HESR and at very low-energies at the CRYRING coupled to the present ESR. Both facilities provide unprecedented physics opportunities already at the very early stage of FAIR operation. The installation of CRYRING, dedicated Low-energy Storage Ring (LSR) for FLAIR, may even enable a much earlier realisation of the physics program of FLAIR with slow anti-protons.

  9. Model calibration and beam control systems for storage rings

    International Nuclear Information System (INIS)

    Electron beam storage rings and linear accelerators are rapidly gaining worldwide popularity as scientific devices for the production of high-brightness synchrotron radiation. Today, everybody agrees that there is a premium on calibrating the storage ring model and determining errors in the machine as soon as possible after the beam is injected. In addition, the accurate optics model enables machine operators to predictably adjust key performance parameters, and allows reliable identification of new errors that occur during operation of the machine. Since the need for model calibration and beam control systems is common to all storage rings, software packages should be made that are portable between different machines. In this paper, we report on work directed toward achieving in-situ calibration of the optics model, detection of alignment errors, and orbit control techniques, with an emphasis on developing a portable system incorporating these tools

  10. Beam diagnostics at high-intensity storage rings

    International Nuclear Information System (INIS)

    Beam diagnostics at high-intensity facilities feature their own special set of problems and characteristics. Issues peculiar to high-intensity storage rings include beam loss, beam halos, extraction efficiency, beam in the gap, clearing electrodes, and beam-profile measurement. The Los Alamos Proton Storage Ring (PSR) is a nice example of a high-intensity storage ring. The author discusses in some detail three diagnostic systems currently in use at the PSR: the beam-loss-monitor system, the electron-clearing system, and the beam-in-the-gap monitor. Much of the discussion is inspired by the problems that were encountered and the useful things learned while commissioning and developing the PSR. Another inspiration is the work on the next-generation neutron-spallation source, also known as the National Center for Neutron Research (NCNR)

  11. Geodesy for the storage ring of Spring-8

    International Nuclear Information System (INIS)

    A 1.4 km circumference of the Spring-8 surrounds Mihara-Kuriyama Hill which is 50 m higher than the storage ring level. We surveyed 12 reference points and 15 monuments in January and February 1993 before ring building is constructed. The number of measurements is 114 for angle and 106 for distance. These positions were determined within errors of ±2mm. Magnets are to be aligned by these monuments. (author)

  12. Optimization of harmonic sextupoles in Indus-2 electron storage ring

    International Nuclear Information System (INIS)

    Dynamic aperture is one of the deciding parameters of the low emittance electron storage ring performance. Sufficient dynamic aperture is required to reach higher injection efficiency as well as good beam lifetime. In low emittance storage rings, dynamic aperture is limited mainly by the chromaticity correcting sextupoles, which is enhanced by introducing more sextupole magnets in the dispersion free straight section of the ring lattice, known as “harmonic sextupoles”. In Indus-2 storage ring lattice also, there is a plan to accommodate harmonic sextupoles. In this paper we present, how the strength of harmonic sextupoles is optimized for suppressing resonance driving terms up to third order, those are responsible for reducing the dynamic aperture. In such optimization, one of the main difficulties is to choose the optimal weight factor for the different resonance driving terms. We evolved an approach for assigning the relative weight to the various resonances driving terms which is found to be working very well for Indus-2 storage ring. Following this approach, the strength of the harmonic sextupoles is optimized and there is a reasonable enhancement of dynamic aperture with harmonic sextupoles for two different working points of Indus-2

  13. Workshop on compact storage ring technology: applications to lithography

    International Nuclear Information System (INIS)

    Project planning in the area of x-ray lithography is discussed. Three technologies that are emphasized are the light source, the lithographic technology, and masking technology. The needs of the semiconductor industry in the lithography area during the next decade are discussed, particularly as regards large scale production of high density dynamic random access memory devices. Storage ring parameters and an overall exposure tool for x-ray lithography are addressed. Competition in this area of technology from Germany and Japan is discussed briefly. The design of a storage ring is considered, including lattice design, magnets, and beam injection systems

  14. Development of a longitudinal density monitor for storage rings

    OpenAIRE

    Zolotorev, M.; Beche, J. -F.; Byrd, J.; Datte, P.; De Santis, S.; Denes, P; Placidi, M.; Ratti, A.; Riot, V.; Schoenlein, R.; Turner, W.

    2003-01-01

    We report on development of a new storage ring operations tool for measurement of longitudinal beam density profile. The technique mixes synchrotron light with light from a mode locked solid-state laser oscillator in a non-linear crystal and detects the up-converted radiation with a photo-multiplier. The laser is phase locked to the storage ring RF system. The laser choices available for repetition frequency, pulse length and phase modulation give a very wide range of options for matchi...

  15. Genetic algorithm for chromaticity correction in diffraction limited storage rings

    Science.gov (United States)

    Ehrlichman, M. P.

    2016-04-01

    A multiobjective genetic algorithm is developed for optimizing nonlinearities in diffraction limited storage rings. This algorithm determines sextupole and octupole strengths for chromaticity correction that deliver optimized dynamic aperture and beam lifetime. The algorithm makes use of dominance constraints to breed desirable properties into the early generations. The momentum aperture is optimized indirectly by constraining the chromatic tune footprint and optimizing the off-energy dynamic aperture. The result is an effective and computationally efficient technique for correcting chromaticity in a storage ring while maintaining optimal dynamic aperture and beam lifetime.

  16. Workshop on compact storage ring technology: applications to lithography

    Energy Technology Data Exchange (ETDEWEB)

    1986-05-30

    Project planning in the area of x-ray lithography is discussed. Three technologies that are emphasized are the light source, the lithographic technology, and masking technology. The needs of the semiconductor industry in the lithography area during the next decade are discussed, particularly as regards large scale production of high density dynamic random access memory devices. Storage ring parameters and an overall exposure tool for x-ray lithography are addressed. Competition in this area of technology from Germany and Japan is discussed briefly. The design of a storage ring is considered, including lattice design, magnets, and beam injection systems. (LEW)

  17. CSR - a Cryogenic Storage Ring at MPI-K

    OpenAIRE

    von Hahn, R.; Crespo López-Urrutia, J.; Grieser, M.; Orlov, D.; Schröter, C.; Schwalm, D.; Ullrich, J.; Welsch, C.; Wolf, A; Zajfman, D.; Urbain, X.

    2004-01-01

    A small cryogenic storage ring is presently being developed at MPI-K, Heidelberg. The energy in the machine will be variable from 20 keV to 300 keV. Electron cooling will be applied to produce a high quality ion beam. The ring shall accommodate slow, vibrationally and rotationally cooled molecular ions and highly charged ions from the EBIT ion source. Moreover, it will serve as a test facility for the low-energy antiproton ring planned within the FLAIR collaboration to be installed at the fut...

  18. Los Alamos Proton Storage Ring fast-extraction kicker system

    International Nuclear Information System (INIS)

    We describe the kicker system used by the Los Alamos Proton Storage Ring (PSR) for fast extraction of accumulated 800-MeV proton beam. The system has several severe constraints in terms of rise time, field quality, and magnet dimensions. These are, in turn, defined by characteristics of the stored beam, ring lattice, and the allowable activation of ring components. Design methods to meet the constraints are outlined here and we describe the novel modulators that produce the fast pulses required. 3 refs., 7 figs

  19. Active interlock for storage ring insertion devices

    International Nuclear Information System (INIS)

    The insertion devices in the NSLS x-ray ring produce such intense photon beams that passive measures alone are not adequate to protect the vacuum chamber. An active interlock is used to prevent thermal damage from improperly steered electron beams. The interlock system measures the position of the electron beam on both sides of the insertion devices using pick-up electrodes and interrupts the rf if the beam moves outside a safe window. The interlock features redundant circuitry as well as an automatic testing procedure. 1 ref., 4 figs

  20. Performance of high-resolution position-sensitive detectors developed for storage-ring decay experiments

    Science.gov (United States)

    Yamaguchi, T.; Suzaki, F.; Izumikawa, T.; Miyazawa, S.; Morimoto, K.; Suzuki, T.; Tokanai, F.; Furuki, H.; Ichihashi, N.; Ichikawa, C.; Kitagawa, A.; Kuboki, T.; Momota, S.; Nagae, D.; Nagashima, M.; Nakamura, Y.; Nishikiori, R.; Niwa, T.; Ohtsubo, T.; Ozawa, A.; Sato, K.; Sato, S.; Suzuki, S.

    2013-12-01

    As next generation spectroscopic tools, heavy-ion cooler storage rings will be a unique application of highly charged RI beam experiments. Decay spectroscopy of highly charged rare isotopes provides us important information relevant to the stellar conditions, such as for the s- and r-process nucleosynthesis. In-ring decay products of highly charged RI will be momentum-analyzed and reach a position-sensitive detector set-up located outside of the storage orbit. To realize such in-ring decay experiments, we have developed and tested two types of high-resolution position-sensitive detectors: silicon strips and scintillating fibers. The beam test experiments resulted in excellent position resolutions for both detectors, which will be available for future storage-ring experiments.

  1. Design studies for the electron storage ring EUTERPE

    International Nuclear Information System (INIS)

    The 400 MeV electron storage ring EUTERPE is under construction at Eindhoven University of Technology. The ring is to be used as an experimental tool for accelerator physics studies and synchroton radiation applications. The main task of the current research work is the electron optical design of the ring. Lattice design is a basis for machine design as a whole. Design aspects regarding the basic lattice, based on single particle dynamics, include determination of the equilibrium beam size and bunch length, design of achromatic bending sections, selection of tune values, correction of chromaticity, and minimization of the natural emittance in the ring. The basic lattice designed for the EUTERPE ring has a high flexibility so that different electron optical modes can be realized easily. In low energy storage rings with a high beam current, collective effects can cause a significant change in the bunch length, the transverse emittance and the beam lifetime. In order to ensure a good optical performance for the ring, the choice of suitable parameters concerning the vacuum and RF system are essential as far as collective effects are concerned. An estimation of the collective effects in the ring is given. The injector for EUTERPE is a 75 MeV racetrack microtron which is injected from a 10 MeV linac. In order to get sufficient beam current in the ring, a special procedure of continuous injection with an adjustable locally shifted closed orbit has been presented. Details of the injection procedure and numerical simulations are given. (orig./HSI)

  2. Applying Frequency Map Analysis to the Australian Synchrotron Storage Ring

    CERN Document Server

    Tan, Yaw-Ren E; Le Blanc, Gregory Scott

    2005-01-01

    The technique of frequency map analysis has been applied to study the transverse dynamic aperture of the Australian Synchrotron Storage Ring. The results have been used to set the strengths of sextupoles to optimise the dynamic aperture. The effects of the allowed harmonics in the quadrupoles and dipole edge effects are discussed.

  3. Stabilization of the bunch lengthening in a storage ring

    International Nuclear Information System (INIS)

    The method of increasing the longitudinal focusing is considered as a means against the lengthening effect of an intense bunch in the storage ring. Main limitations of this approach are analyzed. A conclusion for having a big momentum compaction factor to obtain a small longitudinal emittance is made. 5 refs

  4. Workshop on performance optimization of synchrotron radiation storage rings

    International Nuclear Information System (INIS)

    The purpose of this workshop was to provide a forum, with user participation, for accelerator physicists the synchrotron light source field to discuss current and planned state-of-the-art techniques storage ring performance. The scope of the workshop focused on two areas: lattice characterization and measurement, and fundamental limitations on low frequency beam stability

  5. A kicker upgrade for Los Alamos proton storage ring

    International Nuclear Information System (INIS)

    Brief coverage of a kicker upgrade for the Los Alamos proton storage ring was presented under the following topic headings: specifications, current required, inductance, rise time, tricks to divide the inductance, safety considerations, accelerated lifetime tests, effect of ferrite permeability and SPICE calculations

  6. Dose estimates for the 1104 m APS storage ring

    International Nuclear Information System (INIS)

    The estimated dose equivalent rates outside the shielded storage ring, and the estimated annual dose equivalent to members of the public due to direct radiation and skyshine from the ring, have been recalculated. The previous estimates found in LS-84 and cited in the 1987 Conceptual Design Report of the APS required revision because of changes in the ring circumference and in the proposed location of the ring with respect to the nearest site boundary. The values assumed for the neutron quality factors were also overestimated (by a factor of 2) in the previous computation, and the correct values have been used for this estimate. The methodology used to compute dose and dose rate from the storage ring is the same as that used in LS-90. The calculations assumed 80 cm thick walls of ordinary concrete (or the shielding equivalent of this) and a roof thickness of 1 meter of ordinary concrete. The circumference of the ring was increased to 1104 m, and the closest distance to the boundary was taken as 140 m. The recalculation of the skyshine component used the same methodology as that used in LS-84

  7. Laser induced bunch lengthening on the ACO storage ring FEL

    Science.gov (United States)

    Robinson, K. E.; Madey, J. M. J.; Deacon, D. A. G.; Velghe, M. F.

    1983-03-01

    The experimental procedures and data obtained during a study of the laser-induced change in the electron bunch length are reported for trials with a free-electron laser (FEL). Bunch lengthening is thought to play a critical role in the efficiency and power output of an FEL. The experimental apparatus consisted of an external laser, an undulator ring, and a nonisochronous storage ring. Synchrotron light in the storage ring was measured by a photodiode, and bunch length changes were monitored by tuning the receiver mode to a harmonic of the orbit frequency. A Gaussian electron pulse shape was assumed, together with a Gaussian envelope for the Fourier transform, which was proven in a previous experiment. The power spectra of the photodiode were modeled analytically. It was found that high current conditions alter the electron excitation and require further theoretical modeling.

  8. Particle tracking and map analysis for compact storage rings

    International Nuclear Information System (INIS)

    Particle tracking codes for large storage rings approximate the Hamiltonian by neglecting terms of order x/ρ and higher. For storage rings with small bending radius magnets like the Super Conducting X-ray Lithography Source (SXLS), which make use of combined function bending magnets, these approximations cannot be made. The authors use an explicit symplectic integrator to construct a tracking code which uses the exact Hamiltonian for drifts and isomagnetic combined function bending magnets, in a manner similar to the Teapot code. Hard edge fringe fields are included in a symplectic manner for dipoles and quadrupoles. The integrator is coupled to the DA package of Berz to provide an arbitrary order map which can be analyzed using the tools of Forest and Irwin. A discussion of the techniques and an application to the SXLS ring at Brookhaven is presented

  9. Development of a longitudinal density monitor for storage rings

    International Nuclear Information System (INIS)

    We report on development of a new storage ring operations tool for measurement of longitudinal beam density profile. The technique mixes synchrotron light with light from a mode locked solid-state laser oscillator in a non-linear crystal and detects the up-converted radiation with a photo-multiplier. The laser is phase locked to the storage ring RF system. The laser choices available for repetition frequency, pulse length and phase modulation give a very wide range of options for matching the bunch configuration of particular storage rings. Progress in the technology of solid-state lasers ensures this system can be made robust for routine use in storage ring operations. A very large number of important applications are possible including measurement of the fraction of untrapped particles prior to acceleration, the population of particles in the nominally unfilled RF buckets in a bunch train (''ghost bunches''), longitudinal tails, the diffusion of particles into the beam abort gap and th e normal bunch parameters of longitudinal shape and intensity. We are currently investigating application to two devices: (1) the 1.9 GeV ALS electron storage ring at LBNL with 328 RF buckets, 2ns bucket spacing, 276 nominally filled bunches, 15-30ps rms bunch length and (2) the 7 TeV LHC proton collider under construction at CERN with 35,640 RF buckets, 2.5 ns bucket spacing, 2,808 nominally filled bunches, 280-620 ps rms bunch length. A proof of principle experiment is being conducted on ALS. The results of the ALS experiment and detailed analyses of the application to LHC and its requirements are described

  10. Status of the cryogenic heavy-ion storage ring CSR

    International Nuclear Information System (INIS)

    At the MPI fuer Kernphysik the new cryogenic electrostatic heavy ion storage ring CSR is currently under construction. By applying liquid helium cooling, it will reach a residual gas pressure in the 10-14 mbar region, which will enable the storage of even highly charged atomic ions over extraordinarily long times. In addition the ring can be operated at any temperature between 10 K and room temperature. As an electrostatic device, it will allow storage of ions of masses up to and above 100 a.m.u. In two of its straight sections, an electron cooling device for beam cooling and low-energy electron collision experiments, and a reaction microscope with a gas jet for kinematically complete high energy investigations are foreseen. The ring will hence be a unique tool for future atomic, molecular and cluster physics experiments under very low densities of residual gas and blackbody radiation, and thus enable a new class of experiments especially in laboratory astrophysics. In this presentation, we give an introduction to the ring design and present the current status of its construction.

  11. Compensation for Booster Leakage Field in the Duke Storage Ring

    CERN Document Server

    Li, Wei; Mikhailov, Stepan F; Popov, Victor; Li, Wei-Min; Wu, Ying K

    2016-01-01

    The High Intensity Gamma-ray Source (HIGS) at Duke University is an accelerator-driven Compton gamma-ray source, providing high flux gamma-ray beam from 1 MeV to 100 MeV for photo-nuclear physics research. The HIGS facility operates three accelerators, a linac pre-injector (0.16 GeV), a booster injector (0.16-1.2 GeV), and an electron storage ring (0.24-1.2 GeV). Because of proximity of the booster injector to the storage ring, the magnetic field of the booster dipoles close to the ring can significantly alter the closed orbit in the storage ring being operated in the low energy region. This type of orbit distortion can be a problem for certain precision experiments which demand a high degree of the energy consistency of the gamma-ray beam. This energy consistency can be achieved by maintaining consistent aiming of the gamma-ray beam, therefore, a steady electron beam orbit and angle at the Compton collision point. To overcome the booster leakage field problem, we have developed an orbit compensation scheme. ...

  12. Performance of high-resolution position-sensitive detectors developed for storage-ring decay experiments

    International Nuclear Information System (INIS)

    Highlights: • Position-sensitive detectors were developed for storage-ring decay spectroscopy. • Fiber scintillation and silicon strip detectors were tested with heavy ion beams. • A new fiber scintillation detector showed an excellent position resolution. • Position and energy detection by silicon strip detectors enable full identification. -- Abstract: As next generation spectroscopic tools, heavy-ion cooler storage rings will be a unique application of highly charged RI beam experiments. Decay spectroscopy of highly charged rare isotopes provides us important information relevant to the stellar conditions, such as for the s- and r-process nucleosynthesis. In-ring decay products of highly charged RI will be momentum-analyzed and reach a position-sensitive detector set-up located outside of the storage orbit. To realize such in-ring decay experiments, we have developed and tested two types of high-resolution position-sensitive detectors: silicon strips and scintillating fibers. The beam test experiments resulted in excellent position resolutions for both detectors, which will be available for future storage-ring experiments

  13. Automatic beam steering in the NSLS storage rings using closed orbit feedback

    International Nuclear Information System (INIS)

    This paper describes recent work on beam stabilization systems for the NSLS electron storage rings. It also reviews several types of detectors presently available for monitoring beam motion and describes possible schemes for stabilizing photon beams in a storage ring. Finally, it briefly discusses plans for simultaneous stabilization of many beam lines in the storage rings. (orig.)

  14. Automatic beam steering in the NSLS [National Synchrotron Light Source] storage rings using closed orbit feedback

    International Nuclear Information System (INIS)

    This paper describes recent work on beam stabilization systems for the NSLS electron storage rings. It also reviews several types of detectors presently available for monitoring beam motion and describes possible schemes for stablizing photon beams in a storage ring. Finally, it briefly discusses plans for simultaneous stabilization of many beam lines in the storage rings

  15. Atomic physics experiments at the high energy storage ring

    Science.gov (United States)

    Stöhlker, Thomas; Litvinov, Yuri A.; the SPARC Collaboration

    2015-11-01

    Facility for Antiproton and Ion Research (FAIR), will offer unprecedented experimental opportunities. The Stored Particles Atomic Research Collaboration (SPARC) at FAIR aims at creating a worldwide unique research program with highly charged ions by utilizing storage ring and trapping facilities. The foreseen experiments will address physics at strong, ultra-short electromagnetic fields including the fundamental interactions between electrons and heavy nuclei as well as the experiments at the border between nuclear and atomic physics. In view of the staged construction of the FAIR facility, SPARC worked out an early realization scheme for experiments with highly-charged heavy-ions at relativistic energies to be conducted in the High-Energy Storage Ring.

  16. Global coupling and decoupling of the APS storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Chae, Y.C.; Liu, J.; Teng, L.C.

    1993-07-01

    This paper describes a study of controlling the coupling between the horizontal and the vertical betatron oscillations in the 7-GeV Advanced Photon Source (APS) storage ring. First, we investigate the strengthening of coupling using two families of skew quadrupoles. Twenty skew quadrupoles are arranged in the 40 sectors of the storage ring and powered in such a way so as to generate both quadrature components of the required 21st harmonic. The numerical results from tracking a single particle are presented for the various configurations of skew quadrupoles. Second, we describe the global decoupling procedure to minimize the unwanted coupling effects. These are mainly due to the random roll errors of normal quadruples. It is shown that even with the rather large rms roll error of 2 mrad, the coupling effects can be compensated for with 20 skew quadrupoles each having maximum strength one order of magnitude lower than the typical normal quadrupole strength.

  17. Longitudinal beam stability in heavy ion storage rings

    International Nuclear Information System (INIS)

    This is an attempt to scale conditions for longitudinal beam stability to heavy ion storage rings (HIS) which have been proposed as part of some accelerator schemes to drive pellet fusion. The instability considered has been observed in many high intensity proton machines. In the CERN 25 GeV Proton Synchrotron (PS), this can occur near transition energy as well as during debunching at high energy. In the 30 GeV intersecting storage rings (ISR) similar effects happen to the newly injected beam when too many dense bunches are transferred. In all these cases the instability manifests itself by a rapid blow-up of the beam momentum spread and this blow-up is accompanied by rf activity observed on beam current pick-up electrodes at frequencies in the, say, 0.3 to 2 GHz region

  18. First commissioning of the HLS-II storage ring

    CERN Document Server

    Liu, Gang-Wen; Xu, Wei; Wang, Lin; Li, Wei-Min; Li, Jing-yi

    2015-01-01

    To meet the increasing requirements of synchrotron radiation users, the upgrade project to enhance the performance of Hefei Light Source (HLS), named HLS-II, was launched in 2010, and in 2014 the first commissioning of HLS-II was successfully completed. After the commissioning, the main design goals for the HLS-II storage ring have been achieved, with natural emittance of electron beam lower than 40 nm-rad at 800 MeV, five insertion devices installed in straight sections and root mean square (rms) jitter of closed orbit smaller than 4 {\\mu}m, making HLS-II at a higher level among the same class of machines in the world. This paper reports on the results of the commissioning of the HLS-II storage ring, which includes linear optics correction, compensation of insertion devices effect and closed orbit feedback.

  19. Monitoring the filling pattern of the ANKA storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Kehrer, Benjamin; Hiller, Nicole; Hofmann, Andre; Huttel, Erhard; Judin, Vitali; Klein, Marit; Marsching, Sebastian; Mueller, Anke-Susanne; Smale, Nigel [Karlsruhe Institute of Technology, Karlsruhe (Germany)

    2011-07-01

    The user's demand of customized radiation pulse patterns for time-resolved experiments requires precise measurements of the filling pattern. In order to achieve this, a filling pattern monitor based on Time-Correlated Single Photon Counting was installed and tested at the ANKA storage ring. The technique of Time-Correlated Single Photon Counting is well suited for measuring periodic signals as it is superior to analog recording with regard to bandwidth and signal-to-noise ratio. It is based on measuring the arrival times of single photons by dedicated detectors relative to a periodical trigger signal. At the ANKA storage ring we use a Single Photon Avalanche Diode as detector. This talk discusses the method and presents first results.

  20. Survey of Digital Feedback Systems in High Current Storage Rings

    International Nuclear Information System (INIS)

    In the last decade demand for brightness in synchrotron light sources and luminosity in circular colliders led to construction of multiple high current storage rings. Many of these new machines require feedback systems to achieve design stored beam currents. In the same time frame the rapid advances in the technology of digital signal processing allowed the implementation of these complex feedback systems. In this paper I concentrate on three applications of feedback to storage rings: orbit control in light sources, coupled-bunch instability control, and low-level RF control. Each of these applications is challenging in areas of processing bandwidth, algorithm complexity, and control of time-varying beam and system dynamics. I will review existing implementations as well as comment on promising future directions

  1. Scale Down Experiments for a Stellarator type Magnetostatic Storage Ring

    CERN Document Server

    Joshi, N; Meusel, O; Niebuhr, H; Ratzinger, U

    2016-01-01

    The beam transport experiments in toroidal magnets were first described in EPAC08 [1] within the framework of a proposed low energy ion storage ring at Frankfurt University. The experiments with two room temperature 30 degree toroids are needed to design the accumulator ring with closed longitudinal magnetic field levels up to 6-8 T. The test setup aims on developing a ring injection system. The primary beam line for the experiments was installed and successfully commissioned in 2009. A special probe for ion beam detection was installed. This modular technique allows online diagnostics of the ion beam along the beam path. In this paper, we present new results on beam transport experiments and discuss transport and transverse beam injection properties of that system.

  2. 40-angstrom FEL designs for the PEP storage ring

    International Nuclear Information System (INIS)

    We explore the use of the 2.2-km PEP storage ring at SLAC to drive a 40-Angstrom free-electron laser in the self-amplified spontaneous emission configuration. Various combinations for electron-beam and undulator parameters, as well as special undulator designs, are discussed. Saturation and high peak, in-band, coherent power (460 MW) are possible with a 67-m, hybrid permanent-magnet undulator in a ring bypass. A 100-m, cusp-field undulator can achieve high average, in-band, coherent power (0.25 W) in the main ring. The existing, 25.6-m, Paladin undulator at LLNL, with the addition of optical-klystron dispersive sections, is considered for both peak and average power. 35 refs., 4 figs., 1 tab

  3. Physics of Superpulses in Storage Ring Free-Electron Lasers

    Directory of Open Access Journals (Sweden)

    Vladimir N. Litvinenko

    2008-01-01

    Full Text Available Contradictory to the widespread perception, storage ring free-electron lasers with substantial net gain can generate peak lasing power reaching GW levels in the so-called superpulse mode. This power level is sufficient for studies of nonlinear processes and efficient intracavity harmonic generation. This letter describes the physics of the superpulses and a phase-space refreshment in the electron beam responsible for this phenomenon.

  4. Pixel detectors for diffraction-limited storage rings

    OpenAIRE

    Denes, Peter; Schmitt, Bernd

    2014-01-01

    Dramatic advances in synchrotron radiation sources produce ever-brighter beams of X-rays, but those advances can only be used if there is a corresponding improvement in X-ray detectors. With the advent of storage ring sources capable of being diffraction-limited (down to a certain wavelength), advances in detector speed, dynamic range and functionality is required. While many of these improvements in detector capabilities are being pursued now, the orders-of-magnitude increases in brightness ...

  5. Bunch lengthening with bifurcation in electron storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Eun-San; Hirata, Kohji [National Lab. for High Energy Physics, Tsukuba, Ibaraki (Japan)

    1996-08-01

    The mapping which shows equilibrium particle distribution in synchrotron phase space for electron storage rings is discussed with respect to some localized constant wake function based on the Gaussian approximation. This mapping shows multi-periodic states as well as double bifurcation in dynamical states of the equilibrium bunch length. When moving around parameter space, the system shows a transition/bifurcation which is not always reversible. These results derived by mapping are confirmed by multiparticle tracking. (author)

  6. A new method for beam stacking in storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Bhat, C.M.; /Fermilab

    2008-06-01

    Recently, I developed a new beam stacking scheme for synchrotron storage rings called 'longitudinal phase-space coating' (LPSC). This scheme has been convincingly validated by multi-particle beam dynamics simulations and has been demonstrated with beam experiments at the Fermilab Recycler. Here, I present the results from both simulations and experiments. The beam stacking scheme presented here is the first of its kind.

  7. Storage ring design for x-ray lithography

    International Nuclear Information System (INIS)

    The design of an electron storage ring for Industrial x-ray Lithography is examined and a parameter optimization carried out based on a model lithography system in use at the National Synchrotron Light Source at Brookhaven National Laboratory. In this optimization the potential use of superconducting or permanent magnet wigglers is considered. The basic parameters and geometry of a number of t(exposure) = 5 sec., lambda (operating) = 8.26 A devices are presented

  8. Investigation of longitudinal dynamic in laser electron storage ring

    CERN Document Server

    Karnaukhov, I; Telegin, Yu P

    2001-01-01

    Longitudinal dynamic of electron beam due to radiation damping and quantum fluctuations in the storage ring with a laser-electron interaction section (Compton scattering) is investigated. This investigation was carried out by numerical simulations using the Monte Carlo method. The dependence of the steady-state energy spread of electron beam due to the Compton back scattering of photons on the electron beam energy and photon flash density were obtained. Simulation findings are compared with the analytical estimations by Z. Huang.

  9. Workshop on performance optimization of synchrotron radiation storage rings

    International Nuclear Information System (INIS)

    The purpose of this workshop was to provide a forum, with user participation, for accelerator physicists working in the synchrotron light source field to discuss current and planned state-of-the-art techniques to optimize storage ring performance. The scope of the workshop focused on two areas: lattice characterization and measurement, and fundamental limitations on low frequency beam stability. copyright 1996 American Institute of Physics

  10. Beam Orbit Diagnostics and Control in CANDLE Storage Ring

    CERN Document Server

    Amatuni, Gayane A; Mikaelyan, Raphael; Tsakanov, Vasili M; Vardanyan, Ashot

    2005-01-01

    Stability requirements for the CANDLE light source are the consequence of a small electron beam size and a tolerable photon beam parameters. In a real machine, the components of the storage ring have static and dynamic imperfections, which cause disturbance of the electron beam and consequently photon beams parameters. In the present paper the basic approaches to the beam diagnostics, control and correction issues for the CANDLE facility are given. The algorithms, electronics and processing hardware are described.

  11. Octupole Focusing Relativistic Self-Magnetometer Electric Storage Ring "Bottle"

    OpenAIRE

    Talman, Richard; Talman, John

    2015-01-01

    A method proposed for measuring the electric dipole moment (EDM) of a charged fundamental particle such as the proton, is to measure the spin precession caused by a radial electric bend field $E_r$, acting on the EDMs of frozen spin polarized protons circulating in an all-electric storage ring. The dominant systematic error limiting such a measurement comes from spurious spin precession caused by unintentional and unknown average radial magnetic field $B_r$ acting on the (vastly larger) magne...

  12. The status of the Storage Ring EDM experiment

    International Nuclear Information System (INIS)

    The status of the storage ring experiment capable of probing the proton and deuteron EDM at the 10-29 e.cm level is presented here. At this level it will be sensitive to a new physics mass scale of ∼300 TeV. If there is new physics at the LHC, it will be sensitive to 10μrad CP-violating phase level making it the most sensitive experiment for CP-violation beyond the SM.

  13. SPARC Collaboration: New Strategy for Storage Ring Physics at FAIR

    OpenAIRE

    Stöhlker, Thomas; Litvinov, Yuri A.; Bräuning-Demian, Angela; Lestinsky, Michael; Herfurth, Frank; Maier, Rudolf; Prasuhn, Dieter; Schuch, Reinhold; Steck, Markus; Collaboration, for the SPARC

    2014-01-01

    SPARC collaboration at FAIR pursues the worldwide unique research program by utilizing storage ring and trapping facilities for highly-charged heavy ions. The main focus is laid on the exploration of the physics at strong, ultra-short electromagnetic fields including the fundamental interactions between electrons and heavy nuclei as well as on the experiments at the border between nuclear and atomic physics. Very recently SPARC worked out a realization scheme for experiments with highly-charg...

  14. Abel transform analysis of ion storage ring imaging data

    International Nuclear Information System (INIS)

    In this paper a new approach to analyze dissociative recombination product distance distributions measured at ion storage rings is presented. This approach is based on an Abel transform and the validity is demonstrated for the imaging data obtained from the CRYRING experiments on the dissociative recombination of H2+ and CO+. The reported method is generally valid for the data analysis of high resolution merged beams experiments such as DESIREE where isotropic fragment distributions can be expected.

  15. Investigation of longitudinal dynamic in laser electron storage ring

    International Nuclear Information System (INIS)

    Longitudinal dynamic of electron beam due to radiation damping and quantum fluctuations in the storage ring with a laser-electron interaction section (Compton scattering) is investigated. This investigation was carried out by numerical simulations using the Monte Carlo method. The dependence of the steady-state energy spread of electron beam due to the Compton back scattering of photons on the electron beam energy and photon flash density were obtained. Simulation findings are compared with the analytical estimations by Z. Huang

  16. Intercombination transition rates measured at an ion storage ring

    International Nuclear Information System (INIS)

    At an ion storage ring, long atomic lifetimes can be determined by using dielectronic recombination (DR) resonances in the collisions of the circulating ions with the electrons of an electron cooler. We utilized this method for an estimate of the fraction of ions in metastable states and present preliminary lifetime for Be-like N3+ and O4+. The necessity for using other detection techniques is discussed. (orig.)

  17. Storage Ring Based EDM Search — Achievements and Goals

    Science.gov (United States)

    Lehrach, Andreas

    2016-02-01

    This paper summarizes the experimental achievements of the JEDI (Jülich Electric Dipole moment Investigations) Collaboration to exploit and demonstrate the feasibility of charged particle Electric Dipole Moment searches with storage rings at the Cooler Synchrotron COSY of the Forschungszentrum Jülich. Recent experimental results, design and optimization of critical accelerator elements, progress in beam and spin tracking, and future goals of the R & D program at COSY are presented.

  18. General spin precession and betatron oscillation in storage rings

    Science.gov (United States)

    Fukuyama, Takeshi

    2016-07-01

    Spin precession of particles having both anomalous magnetic and electric dipole moments (EDMs) is considered. We give the generalized expression of spin precession of these particles injected with transversal extent in magnetic storage rings. This is the generalization of the Farley’s pitch correction [F. J. N. Farley, Phys. Lett. B 42, 66 (1972)], including radial oscillation as well as vertical one. The transversal betatron oscillation formulae of these particles are also reproduced.

  19. Design of a small storage ring in JAERI

    International Nuclear Information System (INIS)

    This paper reports on a small storage ring (JSR) under construction to be installed into a present linac. The main purposes of JSR are the studies of the accelerator physics and the tests of some new ideas for aiming at the development of a high brilliant synchrotron radiation facility (6∼8 GeV). The ring size is limited by the available space of the linac building, so that the circumference of JSR become ∼20.5 m. However, even in this small ring, one straight section with the length of ∼1.5 m, where the dispersion is free, is provided for the insertion device study. JSR is an acceleration and storage type ring. The injection energy is 150 MeV and the stored energy is slowly increased up to 300 MeV. The beam current is ∼100 mA. The superperiodicity is 3 and the harmonic number is 8. JSR will come into operation on March, 1989

  20. Internal target effects in ion storage rings with beam cooling

    International Nuclear Information System (INIS)

    The accurate description of internal target effects is important for the prediction of operation conditions which are required for experiments in the planned storage rings of the FAIR facility. The BETACOOL code developed by the Dubna group has been used to evaluate beam dynamics in ion storage rings, where electron cooling in combination with an internal target is applied. Systematic benchmarking experiments of this code were carried out at the ESR storage ring at GSI. A mode with vanishing dispersion in the target position was applied to evaluate the influence of the dispersion function on the parameters when the target is heating the beam. The influence of the internal target on the beam parameters is demonstrated in the present work. A comparison of experimental results with simple models describing the energy loss of the beam particles in the target as well as with more sophisticated simulations with the BETACOOL code is given. In order to study the conditions which can be achieved in the proposed experiments the simulation results were quantitatively compared with experimental results and simulations for the ESR. The results of this comparison are discussed in the present thesis. BETACOOL simulations of target effects were performed for the NESR and the HESR of the future FAIR facility in order to predict the beam parameters for the planned experiments. (orig.)

  1. Internal target effects in ion storage rings with beam cooling

    Energy Technology Data Exchange (ETDEWEB)

    Gostishchev, Vitaly

    2008-06-15

    The accurate description of internal target effects is important for the prediction of operation conditions which are required for experiments in the planned storage rings of the FAIR facility. The BETACOOL code developed by the Dubna group has been used to evaluate beam dynamics in ion storage rings, where electron cooling in combination with an internal target is applied. Systematic benchmarking experiments of this code were carried out at the ESR storage ring at GSI. A mode with vanishing dispersion in the target position was applied to evaluate the influence of the dispersion function on the parameters when the target is heating the beam. The influence of the internal target on the beam parameters is demonstrated in the present work. A comparison of experimental results with simple models describing the energy loss of the beam particles in the target as well as with more sophisticated simulations with the BETACOOL code is given. In order to study the conditions which can be achieved in the proposed experiments the simulation results were quantitatively compared with experimental results and simulations for the ESR. The results of this comparison are discussed in the present thesis. BETACOOL simulations of target effects were performed for the NESR and the HESR of the future FAIR facility in order to predict the beam parameters for the planned experiments. (orig.)

  2. Some uses of REPMM's in storage rings and colliders

    International Nuclear Information System (INIS)

    Improvements for existing rings and techniques for building new rings composed entirely of passive, Rare Earth Permanent Magnet Multipoles (REPMM's) are considered using circular dipoles, quadrupoles and sextupoles. Over the past few years we have made such magnets using a single size SmCo5 block with up to five easy-axis orientations. The final production scheme is modular in that magnets are built-up from quantized layers. All multipole layers are made in exactly the same way using algorithms differing only by the desired multipole symmetry. The method is simple, efficient and inexpensive and allows a ''do-it-yourself'' approach to constructing new magnetic elements. For rings these might include focusing optical klystrons, rotatable multipoles for diagnostics, correction or extraction, or possibly combined function systems for the unit cells. A high quality, low-beta, PMQ insertion which can change beta, tune and energy is described as well as the PMS's for the SD and SF elements of the North SLC damping ring. Because these sextupoles will be the first optical use of PM's in storage rings they are discussed in detail together with the advantages, problems and requirements of such applications. 8 refs., 4 figs

  3. Some uses of REPMM's in storage rings and colliders

    International Nuclear Information System (INIS)

    Improvements for existing rings and techniques for building new rings composed entirely of passive, Rare Earth Permanent Magnet Multipoles (REPMM's) are considered using circular dipoles, quadrupoles and sextupoles. Over the past few years we have made such magnets using a single size SmCo5 block with up to five easy-axis orientations. The final production scheme is modular in that magnets are built-up from quantized layers. All multipole layers are made in exactly the same way using algorithms differing only by the desired multipole symmetry. The method is simple, efficient and inexpensive and allows a ''do-it-yourself'' approach to constructing new magnetic elements. For rings these might include focusing optical klystrons, rotatable multipoles for diagnostics, correction or extraction, or possibly combined function systems for the unit cells. A high quality, low-beta, PMQ insertion which can change beta, tune and energy is described as well as the PMS's for the SD and SF elements of the North SLC damping ring. Because these sextupoles will be the first optical use of PM's in storage rings they are discussed in detail together with the advantages, problems and requirements of such applications

  4. The storage-ring FOKKER-PLANCK equation: inclusion of the free electron laser amplifier contributions

    International Nuclear Information System (INIS)

    We analyze the longitudinal phase-space dynamics of e-beam circulating in storage-rings, by exploiting analytical and semianalytical solutions of the relevant FOKKER-PLANCK equation. Particular attention is devoted to the modification induced by the inclusion of the free electron laser amplifier contributions. We study time-dependent solutions and discuss the evolution towards the equilibrium configuration, we also analyze the effect of the laser parameter on the equilibrium conditions and on the longitudinal damping time

  5. Future Synchrotron Light Sources Based on Ultimate Storage Rings

    International Nuclear Information System (INIS)

    The main purpose of this talk is to describe how far one might push the state of the art in storage ring design. The talk will start with an overview of the latest developments and advances in the design of synchrotron light sources based on the concept of an 'ultimate' storage ring. The review will establish how bright a ring based light source might be, where the frontier of technological challenges are, and what the limits of accelerator physics are. Emphasis will be given to possible improvements in accelerator design and developments in technology toward the goal of achieving an ultimate storage ring. An ultimate storage ring (USR), defined as an electron ring-based light source having an emittance in both transverse planes at the diffraction limit for the range of X-ray wavelengths of interest for a scientific community, would provide very high brightness photons having high transverse coherence that would extend the capabilities of X-ray imaging and probe techniques beyond today's performance. It would be a cost-effective, high-coherence 4th generation light source, competitive with one based on energy recovery linac (ERL) technology, serving a large number of users studying material, chemical, and biological sciences. Furthermore, because of the experience accumulated over many decades of ring operation, it would have the great advantage of stability and reliability. In this paper we consider the design of an USR having 10-pm-rad emittance. It is a tremendous challenge to design a storage ring having such an extremely low emittance, a factor of 100 smaller than those in existing light sources, especially such that it has adequate dynamic aperture and beam lifetime. In many ultra-low emittance designs, the injection acceptances are not large enough for accumulation of the electron beam, necessitating on-axis injection where stored electron bunches are completely replaced with newly injected ones. Recently, starting with the MAX-IV 7-bend achromatic cell, we

  6. Future Synchrotron Light Sources Based on Ultimate Storage Rings

    Energy Technology Data Exchange (ETDEWEB)

    Cai, Yunhai; /SLAC

    2012-04-09

    The main purpose of this talk is to describe how far one might push the state of the art in storage ring design. The talk will start with an overview of the latest developments and advances in the design of synchrotron light sources based on the concept of an 'ultimate' storage ring. The review will establish how bright a ring based light source might be, where the frontier of technological challenges are, and what the limits of accelerator physics are. Emphasis will be given to possible improvements in accelerator design and developments in technology toward the goal of achieving an ultimate storage ring. An ultimate storage ring (USR), defined as an electron ring-based light source having an emittance in both transverse planes at the diffraction limit for the range of X-ray wavelengths of interest for a scientific community, would provide very high brightness photons having high transverse coherence that would extend the capabilities of X-ray imaging and probe techniques beyond today's performance. It would be a cost-effective, high-coherence 4th generation light source, competitive with one based on energy recovery linac (ERL) technology, serving a large number of users studying material, chemical, and biological sciences. Furthermore, because of the experience accumulated over many decades of ring operation, it would have the great advantage of stability and reliability. In this paper we consider the design of an USR having 10-pm-rad emittance. It is a tremendous challenge to design a storage ring having such an extremely low emittance, a factor of 100 smaller than those in existing light sources, especially such that it has adequate dynamic aperture and beam lifetime. In many ultra-low emittance designs, the injection acceptances are not large enough for accumulation of the electron beam, necessitating on-axis injection where stored electron bunches are completely replaced with newly injected ones. Recently, starting with the MAX-IV 7-bend

  7. Summary of Working Group on Storage Ring Collective Effects

    International Nuclear Information System (INIS)

    The purposes of this Workshop were to investigate the techniques available for the production of very low emittance electron beams, to explore the limitations of these techniques, and to consider new possibilities that might improve the present situation. Two uses for these low emittance beams are of interest here: to serve for a high energy linear collider, which requires very small beam sizes to achieve a suitable value for the luminosity; and to serve for a free-electron laser (FEL) in the short wavelength - say 40 A - regime, which requires both small transverse beam dimensions and a very low longitudinal emittance. This paper contains a brief summary of the main topics discussed by the Working Group on Storage Ring Collective Effects. In the case of the linear collider application, the use of a damping ring (DR) to reduce, by radiation damping, the emittance of an intermediate energy linac beam prior to its subsequent injection into the remaining high energy linac is considered. For FEL use, a high-gain device with a storage ring to damp the beam periodically between passages through a bypass section containing the long FEL undulator is considered. Such designs - at a longer wavelength of 400 A - are already available, but the shorter wavelength of interest here is much more of a challenge

  8. Magnet alignment of the SPring-8 storage ring

    International Nuclear Information System (INIS)

    Wide area of the storage ring of SPring-8 is put on the hard rock, however the ground of other area was improved. The 21 monuments for the magnet alignment of the storage ring were surveyed before building construction. After tunnel construction the 88 monuments were surveyed again and these positions were determined. After setting girders and magnets, the girders were surveyed with a laser tracker by making network. After the smoothing the relative displacements were within ±0.04 mm. A laser and CCD camera system is used for a precise alignment of quadrupole and sextupole magnets on a girder and now this alignment has finished about half ring. The target shift from the 5m-straight line can be measured to an accuracy less than 10 μm. The misalignment of them are estimated to be less than the tolerance. For these alignment some convenient instruments have been made, for example a target stage with ball cage etc. (author)

  9. Bunch length measurements in the VUV storage ring

    International Nuclear Information System (INIS)

    Measurements of the bunch length have been made as part of a study of current-dependent phenomena to provide a complete characterization of the VUV ring. Scaling laws have been put forth for the anomalous bunch lengthening with current which is generally observed in storage rings. However, there is no complete theory of the lengthening phenomenon and it is of great interest to compare the behavior of existing machines to the scaling laws. In addition, high peak currents are sought both for damping rings for linear colliders and for free-electron laser drivers and might be achieved through low-momentum compaction lattices. Finally since the bunch lengthening depends on the vacuum chamber. The accepted scaling law of bunch length with current contains the RF voltage, electron energy and momentum compaction. The VUV ring was particularly interesting for such measurements because one could separately and easily vary both the electron energy and the momentum compaction. Although the ring is injected at full energy (750 MeV) the authors have had extensive experience running the ring at low-energy (as low as 80 MeV) for the TOK project. In the following they discuss their measurement technique. The low current bunch length in operational conditions is on the order of 170 psec (σ), i.e., comparable to or longer than the vacuum pipe's smallest dimension, and allows a simple measurement. They present data of bunch length versus current (up to 500 mA in a single bunch), varying electron energy and momentum compaction. Finally, a fit of the data with the Chao-Gareyte model is discussed

  10. Measurement of sextupole orbit offsets in the APS storage ring

    International Nuclear Information System (INIS)

    Horizontal orbit errors at the sextuples in the Advanced Photon Source (APS) storage ring can cause changes in tune and modulation of the beta functions around the ring. To determine the significance of these effects requires knowing the orbit relative to the magnetic center of the sextuples. The method considered here to determine the horizontal beam position in a given sextupole is to measure the tune shift caused by a change in the sextupole strength. The tune shift and a beta function for the same plane uniquely determine the horizontal beam position in the sextupole. The beta function at the sextupole was determined by propagating the beta functions measured at nearby quadrupoles to the sextupole location. This method was used to measure the sextupole magnetic center offset relative to an adjacent beam position monitor (BPM) at a number of sextupole locations. We report on the successes and problems of the method as well as an improved method

  11. ELASR - An electrostatic storage ring for atomic and molecular physics at KACST

    Science.gov (United States)

    El Ghazaly, Mohamed O. A.

    A new ELectrostAtic Storage Ring (ELASR) has been designed and built at the King Abdulaziz City for Science and Technology (KACST), in Riyadh, Saudi Arabia. It was developed to be the core of a new storage ring laboratory for atomic and molecular physics at KACST. ELASR follows the standard design of the pioneering storage ring ELISA and it thereby features a racetrack single-bend shaped ring. Complementary simulation code packages were used to work out the design under the requirements of the projected experiments. This paper reports a short description of the ELASR storage ring through an overview of its design and construction.

  12. Magnet design for a low-emittance storage ring

    International Nuclear Information System (INIS)

    The magnet design of the MAX IV 3 GeV storage ring replaces the conventional support girder + discrete magnets scheme of previous third-generation light sources with a compact integrated design having several consecutive magnet elements precision-machined out of a common solid iron block. The MAX IV 3 GeV storage ring, currently under construction, pursues the goal of low electron beam emittance by using a multi-bend achromat magnet lattice, which is realised by having several consecutive magnet elements precision-machined out of a common solid iron block, 2.3–3.4 m long. With this magnet design solution, instead of having 1320 individual magnets, the MAX IV 3 GeV storage ring is built up using 140 integrated ‘magnet block’ units, containing all these magnet elements. Major features of this magnet block design are compactness, vibration stability and that the alignment of magnet elements within each unit is given by the mechanical accuracy of the CNC machining rather than individual field measurement and adjustment. This article presents practical engineering details of implementing this magnet design solution, and mechanical + magnetic field measurement results from the magnet production series. At the time of writing (spring 2014), the production series, which is totally outsourced to industry, is roughly half way through, with mechanical/magnetic QA conforming to specifications. It is the conclusion of the authors that the MAX IV magnet block concept, which has sometimes been described as new or innovative, is from a manufacturing point of view simply a collection of known mature production methods and measurement procedures, which can be executed at fixed cost with a low level of risk

  13. Magnet design for a low-emittance storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Johansson, Martin, E-mail: martin.johansson@maxlab.lu.se [Lund University, Lund (Sweden); Anderberg, Bengt [AMACC AB, Uppsala (Sweden); Lindgren, Lars-Johan [Lund University, Lund (Sweden)

    2014-08-27

    The magnet design of the MAX IV 3 GeV storage ring replaces the conventional support girder + discrete magnets scheme of previous third-generation light sources with a compact integrated design having several consecutive magnet elements precision-machined out of a common solid iron block. The MAX IV 3 GeV storage ring, currently under construction, pursues the goal of low electron beam emittance by using a multi-bend achromat magnet lattice, which is realised by having several consecutive magnet elements precision-machined out of a common solid iron block, 2.3–3.4 m long. With this magnet design solution, instead of having 1320 individual magnets, the MAX IV 3 GeV storage ring is built up using 140 integrated ‘magnet block’ units, containing all these magnet elements. Major features of this magnet block design are compactness, vibration stability and that the alignment of magnet elements within each unit is given by the mechanical accuracy of the CNC machining rather than individual field measurement and adjustment. This article presents practical engineering details of implementing this magnet design solution, and mechanical + magnetic field measurement results from the magnet production series. At the time of writing (spring 2014), the production series, which is totally outsourced to industry, is roughly half way through, with mechanical/magnetic QA conforming to specifications. It is the conclusion of the authors that the MAX IV magnet block concept, which has sometimes been described as new or innovative, is from a manufacturing point of view simply a collection of known mature production methods and measurement procedures, which can be executed at fixed cost with a low level of risk.

  14. Optical distortions in electron/positron storage rings

    International Nuclear Information System (INIS)

    We have studied the optical distortions in the PEP electron/positron storage ring for various optical configurations using the computer programs DIMAT, HARMON, PATRICIA, and TURTLE. The results are shown graphically by tracing several thousand trajectories from one interaction region to the next using TURTLE and by tracing a few selected rays several hundred turns using the programs DIMAT and PATRICIA. The results show an interesting correlation between the calculated optical cleanliness of a particular lattice configuration and the observed operating characteristics of the machine

  15. The Cornell electron-positron storage ring - CESR

    International Nuclear Information System (INIS)

    At the Laboratory of Nuclear Studies of Cornell University we are working on a project to convert the present 12 GeV electron synchrotron complex into the Cornell Electron-Positron Storage Ring - CESR. The design studies for this new device were begun in early 1975. During the past eighteen months the National Science Foundation has supported a program of research and development on CESR and funds to begin construction are included in the NSF budget now before the U.S. Congress. Our goal is to have CESR in operation in the fall of 1979. (orig.)

  16. Automating beam optics measurements at the ANKA storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Marsching, Sebastian [Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany); aquenos GmbH, Baden-Baden (Germany); Fitterer, Miriam; Hillenbrand, Steffen; Hiller, Nicole; Hofmann, Andre; Huttel, Erhard; Judin, Vitali; Klein, Marit; Mueller, Anke-Susanne; Smale, Nigel; Sonnad, Kiran; Tavares, Pedro [Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany)

    2010-07-01

    ANKA is a synchrotron radiation facility at the Karlsruhe Institute of Technology. In order to automate long term measurements and ease often repeated tasks, a set of software tools has been created for the ANKA storage ring. These tools connect the accelerator control system with various diagnostic tools (e.g. a tune measurement system). Using these tools, operators can perform tasks like chromaticity or dispersion measurements without manual intervention. This talk gives an insight into the measurement and analysis tools that have been developed and presents the results of some of the measurements accomplished at ANKA.

  17. 60 HZ beam motion reduction at NSLS UV storage ring

    International Nuclear Information System (INIS)

    A significant reduction in 60 hz beam motion has been achieved in the UV storage ring. From the wide band harmonic beam motion signal, 60 hz signal is extracted by tuned bandpass filter. This signal is processed by the phase and amplitude adjustment circuits and then, it is fed into the harmonic orbit generation circuits. Several harmonics, near the tune, were canceled by employing one circuit for each harmonic. The design and description of this experiment is given in this paper. The results showing reduction in beam motion at 60 hz are also provided

  18. Improving the chromatic effects of storage rings with antisymmetric insertions

    International Nuclear Information System (INIS)

    High luminosity storage rings require good chromatic behavior for beams with large momentum spreads. This requires that the effects of half-integer structure resonances for off-momentum particles be minimized. We show that a lattice with antisymmetric insertions can be so designed that the driving term for the half-integer structure resonance is suppressed by cancellation of successive pairs of high-beta multiplets. Hence, even though the periodicity is half that of a lattice with symmetric insertions, the chromatic properties are similar

  19. Light ion EDM search in magnetic storage rings

    International Nuclear Information System (INIS)

    Permanent electric dipole moments (EDMs) violate parity and time-reversal symmetry. Within the Standard Model (SM), they require CP violation and are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of 'new physics.' So far only electrically neutral systems were used for sensitive searches of EDMs. Several techniques, based on storing fast particles in a magnetic storage ring, are being developed to probe charged particles for an EDM. With the introduction of these novel experimental methods, high sensitivity for charged systems, in particular light nuclei, is within reach.

  20. Simulation of synchrotron radiation in an electron storage ring

    International Nuclear Information System (INIS)

    The authors studied a method of using symplectic integrator to simulate incoherent synchrotron radiation in an electron storage ring. The simulation includes both classical radiation and its quantum fluctuations. They found that the emission process of photon using a compound Poisson process cannot be applied to the fourth-order integrator because it has negative path length which implies a negative number of emitted photons. The simulations are carried out using only the second-order integrator. The result of equilibrium beam size agrees with the analytical calculation well. The method can be applied for all types of magnets

  1. Beam tracking of a compact storage ring. 2

    International Nuclear Information System (INIS)

    A beam tracking with a numerical integration method has been studied for a design of a compact storage ring. Suitable numerical integration schemes for the beam tracking have been studied. Estimations of calculating speeds and accumulations of calculating errors have shown that a Runge-Kutta-Verner method and a Adams-Moulton's method are suitable for the beam tracking. Calculating results with various integration schemes have also shown that the numerical integration method can simulate an electron beam accurately when calculating errors are taken care of and tracking turns are restricted. (author)

  2. Non-linear dissipative phenomena in electron storage rings

    International Nuclear Information System (INIS)

    This lecture is intended to provide a concise introduction to the dynamical phenomena characteristic of electron storage rings. In keeping with the aims of this School, it is aimed at a general audience of physicists and mathematicians interested in non-linear dynamics just as much as at accelerator specialists. Accordingly, the authors tried to introduce all the special terminology necessary beyond that already covered in the introductory lecture on single-particle dynamics and to relate the concepts to those which may be familiar to workers in other fields

  3. Neutrino-factory storage ring with multiple baselines

    CERN Document Server

    Cline, David B; Garren, A

    2001-01-01

    We designed a noble bow tie storage ring to provide neutrino beams for multiple neutrino detectors around the world with a baseline length of about 1000-9000 km. We present a preliminary lattice that could provide non-planar straight sections. We describe the amount of non-planarity of the third or fourth baseline and the space angles between the baselines and the local surface angles at possible site locations for neutrino factories and at the possible detector locations. We describe the detectors at the Gran Sasso Laboratory, Italy, and at the new laboratory at Carlsbad, NM.

  4. Study on CSR in storage ring and ERL

    International Nuclear Information System (INIS)

    A fine dip structure can be made in the long electron bunch by the technique so called 'laser bunch slicing'. At the UVSOR-II storage ring, the oscillation of the dip structure related to the betatron tune was observed in some low alpha optics. It indicated the existence of the transverse-longitudinal coupling effect, which had been theoretically predicted. Additionally, an inverse Compton scattering of coherent synchrotron radiation is proposed as a soft X-ray source of 200 MeV class energy recovery linac (ERL). The light source has a sub pico-seconds short pulse with high repetition rate of 1.3 GHz. (author)

  5. Conceptual design of compact storage ring for Korean semiconductor industry

    International Nuclear Information System (INIS)

    In this paper an 1.0 GeV compact synchrotron radiation source is discussed. The circumference of the storage ring is 30.2 m. Six normal-type bending magnets are allocated to form a hexagon with two 3.2 meter- long dispersion free sections. The radius of bending magnet is 2.39 meters and the critical wavelength of the synchrotron radiation is 13.35 Angstrom. It is assumed that PLS linear accelerator is used to inject 1.0 GeV electron beam

  6. Study of orbit stability in the SSRF storage ring

    Institute of Scientific and Technical Information of China (English)

    DAI Zhi-Min; LIU Gui-Min; HUANG Nan

    2003-01-01

    In this paper, analysis of the beam orbit stability and conceptual study of the dynamic orbit feedback inthe SSRF storage ring are presented. It is shown that beam orbit position movement at the photon source points issmaller than the orbit stability requirements in horizontal plane, but exceeds the orbit stability requirements in verticalplane. A dynamic global orbit feedback system, which consists of 38 high-bandwidth air-coil correctors and 40high-precise BPMs, is proposed to suppress the vertical beam orbit position movement. Numerical simulations showthat this dynamic orbit feedback system can stabilize the vertical beam orbit position movement in the frequencyrange up to 100 Hz.

  7. Measurement of electric dipole moments at storage rings

    Science.gov (United States)

    Jörg Pretz JEDI Collaboration

    2015-11-01

    The electric dipole moment (EDM) is a fundamental property of a particle, like mass, charge and magnetic moment. What makes this property in particular interesting is the fact that a fundamental particle can only acquire an EDM via {P} and {T} violating processes. EDM measurements contribute to the understanding of the matter over anti-matter dominance in the universe, a question closely related to the violation of fundamental symmetries. Up to now measurements of EDMs have concentrated on neutral particles. Charged particle EDMs can be measured at storage ring. Plans at Forschungszentrum Jülich and results of first test measurements at the COoler SYnchrotron COSY will be presented.

  8. Safety orientations during ASTRID conceptual design phase

    International Nuclear Information System (INIS)

    In France, Safety Options Report is the first document issued in the frame of the licensing of any new nuclear facility. It is usually issued at the end of the conceptual design phase. For the ASTRID project, a Safety Orientations Document was first prepared during the pre-conceptual design phase. This document, transmitted to the French Safety Authority, aims at supporting the conceptual design studies, the associated R&D program and then, selecting the basic design safety options. ASTRID safety orientations are based on the previous Sodium-cooled Fast Reactors feedback, safety standards evolution, and other feedbacks such as the lessons issued from Fukushima accident. Safety goals set for ASTRID, considered as a demonstrator of future SFR, are ambitious, anticipating potential evolution of safety regulation. Among the safety orientations of ASTRID, the following items are developed in this paper: • Distinction between design domains which are: severe accident prevention, severe accident mitigation and practically eliminated situations, • Safety classification of equipment, • Identification of elements to be included into the “hard core” list, • Approach for severe accident, • Concept of “lines of mitigation”, • Demonstration of practical elimination of unacceptable situations. (author)

  9. Magnetic measurements on the ring dipoles and quadrupoles for the Los Alamos proton storage ring

    International Nuclear Information System (INIS)

    This paper discusses magnetic measurements and shimming performed on the ring dipoles and quadrupoles for the Los Alamos Proton Storage Ring (PSR). For the dipoles, point-by-point field maps were obtained using a search coil that could be scanned over a three-dimensional grid. By appropriate machining of removable end blocks, all magnet lengths were adjusted to within 0.01% of a nominal value and all integrated multipoles were set within tolerance. Integrated fields of 20 PSR quadrupoles were measured using a rotating ''Morgan Coil'' and a digital spectrum analyzer. The magnets were shimmed to specifications by adjusting steel bolts threaded through the field clamps. 3 refs., 5 figs., 4 tabs

  10. Prospective study of muon storage rings at CERN

    International Nuclear Information System (INIS)

    Muon storage rings and colliders are reviewed. Their outstanding technical issues are outlined, and ways in which the CERN site and infrastructure could be used in their construction are discussed. A three-step scenario is proposed, starting with muon storage rings used primarily as sources for neutrino oscillation studies, continuing with intermediate-energy colliders to explore with precision new particles associated with electroweak symmetry breaking, and including a high-energy frontier machine with a centre-of-mass energy of several TeV. The charge and flavour separation of neutrinos from the decays of stored muons, coupled with their accurately known energy spectra and fluxes, would enable definitive long-, medium- and short-baseline neutrino experiments. The precision intermediate-energy muon colliders have the potential advantages of non-universal Higgs couplings, small energy spread and accurate energy calibration using the decays of polarized muons. A high-energy muon collider offers an attractive way of attaining effective multi-TeV energies in the centre of mass, but neutrino radiation must be controlled if this potential is to be realized fully. (orig.)

  11. Octupole Focusing Relativistic Self-Magnetometer Electric Storage Ring "Bottle"

    CERN Document Server

    Talman, Richard

    2015-01-01

    A method proposed for measuring the electric dipole moment (EDM) of a charged fundamental particle such as the proton, is to measure the spin precession caused by a radial electric bend field $E_r$, acting on the EDMs of frozen spin polarized protons circulating in an all-electric storage ring. The dominant systematic error limiting such a measurement comes from spurious spin precession caused by unintentional and unknown average radial magnetic field $B_r$ acting on the (vastly larger) magnetic dipole moments (MDM) of the protons. Along with taking extreme magnetic shielding measures, the best protection against this systematic error is to use the storage ring itself, as a "self-magnetometer"; the exact magnetic field average $\\langle B_r\\rangle$ that produces systematic EDM error, is nulled to exquisite precision by orbit position control. By using octupole rather than quadrupole focusing the restoring force can be vanishingly small for small amplitude vertical betatron-like motion yet strong enough at larg...

  12. Trim Power Supplies for the Duke Booster and Storage Ring

    CERN Document Server

    Popov, Victor; Mikhailov, Stepan; Oakeley, Owen; Wallace, Patrick W; Wu, Y K

    2005-01-01

    The on-going Duke storage ring upgrades and the development of a new booster synchrotron injection require more than 100 units of high performance unipolar and bipolar trim power supplies in the current range of -15A to +15A. However, most of the trim power supplies on the market do not deliver two critical performance features simultaneously: a high current stability and a low current noise.An in-house trim power supply development program is then put in force to design, fabricate, and test low cost linear power supplies with current stability about 100 ppm and current ripples less than 100 ppm in a broad band. A set of unipolar power supplies (0-12A) have been designed, fabricated and successfully tested. Since August, 2004 they have been used in storage ring operation with excellent performance. The prototype of bipolar power supplies (± 15 A) has been designed and tested as well. The main design principles and their performance results of both unipolar and bipolar supplies will be presented in th...

  13. Prospects for Next-Generation Storage Ring Light Sources

    Science.gov (United States)

    Borland, Michael

    2015-04-01

    Storage ring light sources are among the most productive large-scale scientific user facilities in existence, owing to a combination of broad tunability, mature technology, high capacity, remarkable reliability, and high performance. The most commonly-used performance measure is the photon beam brightness, which is proportional to the flux per unit volume in six-dimensional phase space. The brightness is generally maximized by minimizing the transverse phase space area, or emittance, of the electron beam that generates the photons. Since the 1990's, most storage ring light sources have used a variant of the Chasman-Green, or double-bend-achromat (DBA), lattice, which produces transverse emittances of several nanometers. Presently, several light sources are under construction based on more challenging multi-bend-achromat (MBA) concepts, which promise an order of magnitude reduction in the emittance. Somewhat larger reductions are contemplated for upgrades of the largest facilities. This talk briefly surveys the relevant concepts in light source design, then explains both the mechanism and challenge of achieving next-generation emittances. Other factors, such as improved radiation-emitting devices, are also described. Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.

  14. Ion beam polarization in storage rings. Production, controlling and preservation

    Energy Technology Data Exchange (ETDEWEB)

    Prozorov, A. [St. Petersburg State Univ. (Russian Federation). V.A. Fock Research Institute for Physics; Labzowsky, L. [St. Petersburg State Univ. (Russian Federation). V.A. Fock Research Institute for Physics]|[St. Petersburg Nuclear Physics Institute (Russian Federation); Plunien, G. [Technische Univ. Dresden (Germany). Inst. fuer Theoretische Physik; Liesen, D. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)]|[Heidelberg Univ. (Germany). Physikalisches Inst.; Bosch, F. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Fritzsche, S. [Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany)]|[Heidelberg Univ. (Germany). Physikalisches Inst.]|[Max-Planck Insitute of Nuclear Physics, Heidelberg (Germany); Surzhykov, A. [Max-Planck Insitute of Nuclear Physics, Heidelberg (Germany)

    2008-03-15

    The present paper reports on the actual status of the theoretical concepts for the production of polarized heavy ion beams in storage rings and for methods to control online the degree of polarization as well as investigations of the preservation of the polarization during the ion movement across the magnetic system of the ring. It is argued that for hydrogen-like ions beam polarization can be built up efficiently by optical pumping of the Zeeman sublevels of ground-state hyperfine levels and that the maximal achievable nuclear polarization exceeds 90%. Of special interest are polarized helium-like ions which can be produced by the capture of one electron, because in selected cases parity nonconservation effects are found to be of unprecedented size in Atomic Physics. The measurements of these effects require online-diagnostics of the degree of the ion beam polarization. It is shown that this can be accomplished by an online-detection of the linear polarization of the X-rays which are emitted with the capture of the electron. In order to investigate the preservation of the polarization of the ions stored in the ring, the concept of an instantaneous quantization axis is introduced. The dynamics of this axis and the behaviour of the polarization with respect to it are explored in detail. (orig.)

  15. Cryring - a small storage and acceleration ring for heavy ions

    Energy Technology Data Exchange (ETDEWEB)

    Herrlander, C.J.; Bagge, L.; Barany, A.; Borg, S.; Danared, H.; Heikkinen, P.; Hultberg, S.; Liljeby, L.; Lindblad, Th.

    1985-10-01

    CRYRING is a facility for research in atomic, molecular and nuclear physics using a cryogenic electron beam ion source, CRYSIS, together with an RFQ linear accelerator as injector into a synchrotron ring, which can be used both for acceleration, deceleration and storage of very highly charged, heavy ions. (CRYRING stands for CRYsis-synchrotron-RING, RFQ for Radio Frequency Quadrupole and CRYSIS for CRYogenic Stockholm Ion Source.) A lay-out of CRYRING in an available laboratory area is In the ring itself experiments with a circulating heavy ion beam and merged or crossed beams of electrons, laser-photons, neutrals and ions will be possible. Crossed ion beams will be available from a 400 kV accelerator. Injectors for negative (hydrogen) ions and electrons (intended for cooling as well as experiments) are included in the project. Regarding the extraction of accelerated heavy ions for nuclear and atomic spectroscopy, it should be emphasized that the project aims at very heavy ions (Xe-U) which will be energetic enough to overcome the Coulomb barrier of heavy target nuclei. The different injectors can be separately used for experiments when not in operation for CRYRING. It should also be emphasized that since CRYSIS is a pulsed ion source, beam-sharing will be simplified, making it possible to run two or perhaps even three different experiments simultaneously.

  16. Design of a lattice for JAERI storage ring (JSR)

    International Nuclear Information System (INIS)

    The new 8GeV synchrotron radiation facility (SPring-8) is planned to be constructed in Japan, and our institute (JAERI) are involved in this project with RIKEN. A compact electron storage ring JSR has been constructed in JAERI in order to study various kind of accelerator technologies, to test some devices such as the insertion devices and the beam monitors, and to train young researchers. The ring size is limited by the available space of a linac building, so that the circumference of JSR becomes 20.546 m. However, even in this small ring, one straight section with the length of ∼1.5 m, where the dispersion is free, is provided for the insertion device study. JSR takes Chasman-Green lattice with a superperiodicity of three. JSR is possible not only to suppress the dispersion but also to leave it on the long straight section. An electron beam from a linac is accepted into JSR in any operating modes. (author)

  17. Ultra-low energy storage ring at FLAIR

    International Nuclear Information System (INIS)

    The Ultra-low energy electrostatic Storage Ring (USR) at the future Facility for Low-energy Antiproton and Ion Research (FLAIR) will provide cooled beams of antiprotons in the energy range between 300 keV down to 20 keV and possibly less. The USR has been completely redesigned over the past three years. The ring structure is based on a “split achromat” lattice that allows in-ring experiments with internal gas jet target. Beam parameters might be adjusted in a wide range: from very short pulses in the nanosecond regime to a Coasting beam. In addition, a combined fast and slow extraction scheme was developed that allows for providing external experiments with cooled beams of different time structure. Detailed investigations of the USR, including studies into the ring’s long term beam dynamics, life time, equilibrium momentum spread and equilibrium lateral spread during collisions with an internal target were carried out. New tools and beam handling techniques for diagnostics of ultra-low energy ions at beam intensities less than 106 were developed by the QUASAR Group. In this paper, progress on the USR project will be presented with an emphasis on the expected beam parameters available to the experiments at FLAIR.

  18. Estimate of the coupling impedance for the storage rings of the NSLS

    International Nuclear Information System (INIS)

    The most important ingredient to evaluate the stability of a particle beam in a storage ring is the longitudinal coupling impedance Z/n and the transverse impedance Z/sub perpendicular to/ which is usually associated to the former. These impedances are calculated for the two storage rings which are part of the NSLS, namely the Ultra Violet Ring (UVR) and the x-Ray Ring

  19. A Comparison of Storage Ring Modeling with COSY INFINITY, ZGOUBI, and MAD8

    CERN Document Server

    Hipple, Robert

    2015-01-01

    Currently there is significant interest in the use of storage rings to search for an electric dipole moment (EDM) in hadrons. This requires utilizing the storage ring as a precision measuring device. Part of understanding the detailed behavior of storage rings comes from careful analysis of fringe fields, but the various tracking codes available differ in their ability to model such behavior. It is the purpose of this paper to investigate these differences.

  20. Some aspects of the orbits in an electron storage ring used as a synchrotron radiation source

    International Nuclear Information System (INIS)

    Some aspects of the orbit dynamics in an electron storage ring are described. The research was started as a feasibility study for the proposed 1.5 GeV electron storage ring PAMPUS dedicated to synchrotron radiation applications. An analytical theory is introduced which can also be used for describing the behaviour of the particles. The theory is applied to various possible lattices of the proposed PAMPUS storage ring. The Touschek effect (the most important instability effect at low energies in an electron storage ring) is considered. (Auth.)

  1. Electron cloud instabilities in the Proton Storage Ring and Spallation Neutron Source

    OpenAIRE

    Blaskiewicz, M.; Furman, M.A.; Pivi, M.; Macek, R.J.

    2002-01-01

    Electron cloud instabilities in the Los Alamos Proton Storage Ring (PSR) and those foreseen for the Oak Ridge Spallation Neutron Source (SNS) are examined theoretically, numerically, and experimentally.

  2. Incoherent Effects of Electron Clouds in Proton Storage Rings

    International Nuclear Information System (INIS)

    Electron clouds in the beam pipe of high-energy proton or positron storage rings can give rise to significant incoherent emittance growth, at densities far below the coherent-instability threshold. We identify two responsible mechanisms: namely (1) a beam particle periodically crosses a resonance and (2) a beam particle periodically crosses a region of the bunch where its motion is linearly unstable. Formation of halo or beam-core blow up, respectively, are the result. Key ingredients for both processes are synchrotron motion and electron-induced tune shift. The mechanisms considered provide a possible explanation for reduced beam lifetime and emittance growth observed at several operating accelerators. Similar phenomena are likely to occur in other two-stream systems

  3. Commissioning results of the APS storage ring diagnostics systems

    International Nuclear Information System (INIS)

    Initial commissionings of the Advanced Photon Source (APS) 7-GeV storage ring and its diagnostics systems have been done. Early studies involved single-bunch measurements for beam transverse size (σx ∼ 150 μm, σy ∼ 50 μm), current, injection losses, and bunch length. The diagnostics have been used in studies related to the detection of an extra contribution to beam jitter at ∼ 6.5 Hz frequency; observation of bunch lengthening (σ ∼ 30 to 60 ps) with single-bunch current; observation of an induced vertical, head-tail instability; and detection of a small orbit change with insertion device gap position. More recently, operations at 100-mA stored-beam current, the baseline design goal, have been achieved with the support of beam characterizations

  4. Ion trapping in the high-energy storage ring HESR

    Energy Technology Data Exchange (ETDEWEB)

    Hinterberger, Frank [Bonn Univ. (Germany). Helmholtz-Institut fuer Strahlen- und Kernphysik

    2011-10-15

    The problem of ion trapping in the high-energy storage ring HESR is studied in the present report. Positive ions are trapped in the negative potential well of the antiproton beam. The ions are produced by the interaction between the antiproton beam and the residual gas. The adverse effects of ion trapping like tune shifts, tune spreads and coherent instabilities are reviewed. The ion production rate by ionization of the residual gas molecules is estimated. The negative potential well and the corresponding electric fields of the antiproton beam are evaluated in order to study the transverse and longitudinal motion of the ions and the accumulation in trapping pockets. The removal of ions can be achieved using clearing electrodes and under certain conditions resonant transverse beam shaking. Diagnostic tools and measurements of trapped ion effects are sketched. (orig.)

  5. High gradient quadrupoles for low emittance storage rings

    Science.gov (United States)

    Le Bec, G.; Chavanne, J.; Benabderrahmane, C.; Farvacque, L.; Goirand, L.; Liuzzo, S.; Raimondi, P.; Villar, F.

    2016-05-01

    High gradient quadrupoles are key components for the coming generation of storage ring based light sources. The typical specifications of these magnets are: almost 100 T /m gradient, half a meter long, and a vertical aperture for the extraction of the x-ray beam. This paper presents the preparation work done at the European Synchrotron Radiation Facility, from the design to the manufacture and measurements of a prototype. It demonstrates the feasibility of such magnets. Different aspects of magnet engineering are discussed, including the study of the main scale factors and the preliminary design, the pole shaping, the impact of mechanical errors, and the magnetic measurements of a prototype with a stretched-wire system.

  6. Exact physical model for magnets in storage rings

    International Nuclear Information System (INIS)

    In this report we try to make estimates of both kinematic and field effects on the stability of a particle motion, by employing a truly Maxwellian representation of the magnetic field in exact equations of motion. For this purpose we adopt a simple FODO cell model, which repeats periodically to infinity. This model includes only quadrupoles and drifts, leaving out the bending magnets to avoid the problem of the trajectory curvature. We think this model is a physically consistent approximation of a storage ring. We derive several models with different levels of approximation and compare them by evaluating the importance of these effects. The relevance to long-term stability is being investigated in the meantime by comparing the different models with extensive computer simulations. The results will be shown in a subsequent report

  7. Performance of the OK-4/Duke storage ring FEL

    CERN Document Server

    Litvinenko, V N; Pinayev, I V; Wu, Y

    2001-01-01

    In this paper, we report measured parameters of the OK-4 FEL driven by the Duke storage ring. The OK-4 FEL was being operated continuously for 2 yr in the broad wavelength range for user applications utilising spontaneous and coherent XUV and UV radiation as well as Compton back-scattered gamma-rays in the range of 2-58 MeV. During this time, the OK-4 FEL lased in the range from 193.7 to about 730 nm using five sets of mirrors and electron beam energies from 240 to 800 MeV. Our predictions for the OK-4 FEL are compared with measured performance, both in the CW and in the giant pulse mode. We discuss our future plans for the OK-4 FEL operation as well as the construction and commissioning of the OK-5 FEL with helical wigglers.

  8. The injection beam lines of the cryogenic storage ring (CSR)

    International Nuclear Information System (INIS)

    At the Max-Planck-Institute for Nuclear Physics in Heidelberg an electrostatic cryogenic storage ring (CSR) is under construction. The ions for the CSR will be provided by two ion sources with up to 60kV and 300 kV potential, respectively. The layout of the beamlines connecting the ion sources with the CSR is presented. They will be merged using an electrostatic deflector with an opening in the outer electrode, thereby allowing quick switching between the two ion sources. In order to determine the influence of the opening on the beam optics the deflector has been modeled and a modified transport matrix has been derived. An additional beamline element is a detachment region for the neutralization of a negative ion beam by photodetachment. The potential of the detachment region defines the precise energy of the neutral particles. Calculations of the ion beam optics using the MAD X code are described.

  9. Radiation damage to accelerator components of SPring-8 storage ring

    International Nuclear Information System (INIS)

    Radiation damage to the accelerator components of the SPring-8 storage ring became serious after about four years of operation. Some rubber hoses were broken, resulting in water leakage, and some of the Synflex tubes, interlock cables, power cable covers, and so forth became damaged. Measurement of the radiation levels using GafChromic film and TLD showed that the maximum integrated radiation dose around the hoses at normal cell was 3.9x105Gy. The main radiation sources were the crotches and absorbers. Although there were two crotches and four absorbers in each of the 44 cells, two absorbers in particular caused serious radiation damage. Lead-plate shielding was installed around these absorbers to shield the nearby components

  10. A low energy storage ring for pulse stacking at IUCF

    International Nuclear Information System (INIS)

    A method for providing a highly variable duty factor without sacrificing beam brightness was recently suggested for coupled cyclotron systems by the University of Colorado cyclotron group and is now being developed at Indiana. A low energy isochronous storage ring is used to store beam from the 0.62 MeV ion source pre-injector. The stored beam current is allowed to accumulate to the transverse phase space limit before being extracted for injection into the cyclotron at a pulse rate selected by the user. The device, called a ''stripper loop'', was constructed to test the feasibility of the Colorado suggestion and to explore the space charge limits of the injector cyclotron with more intense beams. The design and operating details of the stripper loop and the preliminary results of the initial development efforts are described below

  11. Radiative polarization in high-energy storage rings

    International Nuclear Information System (INIS)

    Electron and positron beams circulating in high-energy storage rings become spontaneously polarized by the emission of synchrotron radiation. The asymptotic degree of polarization that can be attained is strongly affected by so-called depolarizing resonances. Detailed experimental measurements of the polarization were made SPEAR about ten years ago, but due to lack of a suitable theory only a limited theoretical fit to the data has so far been achieved. I present a general formalism for calculating depolarizing resonances, which as been coded into a computer program called SMILE, and use it to fit the SPEAR data. By the use of suitable approximations, I am able to fit both higher order and nonlinear resonances, and thereby to interpret many hitherto unexplained features in the data, and to resolve a puzzle concerning the asymmetry of certain resonance widths seen in the data. 18 refs., 2 figs

  12. Coupling measurement and correction at the SSRF storage ring

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    Brightness is an important parameter for 3rd generation light source. Correcting the emittance coupling is a realistic way to increase brightness without any additional equipment in a machine under operation. The main sources of emittance coupling are betatron coupling and vertical dispersion. At the SSRF storage ring, tune split and LOCO are used to measure the respective betatron and emittance coupling. Both of these sources can be corrected by skew quadrupoles. By measuring the skew quadrupole-coupling response matrix, betatron coupling can be changed from 0.014% to 2%. But the vertical dispersion changes at the same time. LOCO can find the suitable setting to correct simultaneously the betatron coupling and vertical dispersion. The emittance coupling can be reduced to 0.17% by this method. More simulations show the potential for smaller emittance coupling if more skew quadrupoles are employed.

  13. A polarized sup 3 He internal target for storage rings

    CERN Document Server

    Poolman, H R; Bulten, H J; Doets, M; Ent, R; Ferro-Luzzi, M; Geurts, D G; Harvey, M; Mul, F A

    2000-01-01

    A polarized sup 3 He internal target was employed at the internal target facility of the Amsterdam electron Pulse Stretcher and Storage ring (AmPS) at the Dutch National Institute for Nuclear and High-Energy Physics (NIKHEF). The unique features of internal targets such as chemical and isotopic purity, high and rapidly reversible polarization, and the ability to manipulate the target spin orientation were successfully demonstrated. A nuclear polarization of 0.50 (0.42) at a sup 3 He gas flow of 1.0 (2.0)x10 sup 1 sup 7 at s sup - sup 1 could be obtained. Operation at a nominal flow of 1x10 sup 1 sup 7 at s sup - sup 1 resulted in a target thickness of 0.7x10 sup 1 sup 5 at cm sup - sup 2 at a target temperature of 17 K.

  14. The magnet design for the HLS storage ring upgrade project

    Institute of Scientific and Technical Information of China (English)

    ZHANG Hao; LI Wei-Min; FENG Guang-Yao; WANG Lin; ZHANG Shan-Cai; LI Wei; LIANG Jun-Jun

    2012-01-01

    In order to improve the performance of the Hefei Light Source (HLS),in particular to get higher brilliance synchrotron radiation and increase the number of straight section insertion devices,an upgrade project called HLSII will be launched soon.The storage ring lattice,which has a double bend achromatic structure with four periods,comprises eight dipoles,32 quadrupoles and 32 combined function sextupoles.The design and analysis of the magnets are shown in this paper,along with the optimization of the multipurpose combined function magnet,which consists of three magnets:skew quadrupole,horizontal dipole and vertical dipole,with the main sextupole magnet.This type of magnet is the first one that has been designed and used in China.The mechanical design and fabrication procedures for the magnets are also presented.

  15. Proceedings of the workshop on polarized targets in storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Holt, R.J. (ed.)

    1984-08-01

    Polarization phenomena have played an increasingly important part in the study of nuclei and nucleons in recent years. Polarization studies have been hampered by the relatively few and rather fragile polarized targets which are presently available. The concept of polarized gas targets in storage rings opens a much wider range of possibilities than is available in the external target geometry. This novel method will represent a considerable advance in nuclear physics and will continue to receive much attention in plans for future facilities. An internal, polarized-target station is being planned for the cooler ring at the Indiana University Cyclotron Facility. Internal targets are compatible with recent designs of electron accelerators proposed by the Massachusetts Institute of Technology and the Southeastern Universities Research Association. The key to nuclear-science programs based on internal targets pivots on recent developments in polarized atomic beam methods, which include the more recent laser-driven polarized targets. The workshop drew together a unique group of physicists in the fields of high-energy, nuclear and atomic physics. The meeting was organized in a manner that stimulated discussion among the 58 participants and focused on developments in polarized target technology and the underlying atomic physics. An impressive array of future possibilities for polarized targets as well as current developments in polarized target technology were discussed at the workshop. Abstracts of individual items from the workshop were prepared separately for the data base.

  16. Low-emittance tuning at the Cornell Electron Storage Ring

    CERN Document Server

    Shanks, James; Sagan, David

    2013-01-01

    In 2008 the Cornell Electron/Positron Storage Ring (CESR) was reconfigured from an electron/positron collider to serve as a testbed for the International Linear Collider (ILC) damping rings. One of the primary goals of the CESR Test Accelerator (CesrTA) project is to develop low emittance tuning techniques to achieve sub-10pm geometric vertical emittance at 2.085 GeV. This paper discusses the tuning methods used at CesrTA to achieve low-emittance conditions. A minimum vertical emittance of 8.7 +2.9/-3.4(sys) +/-0.2(stat) pm has been achieved at 2.085 GeV. In various configurations and beam energies the correction technique routinely achieves vertical emittance <15 pm after correction. Beam-based measurement and correction requires about 15 minutes. Simulations modeling the effects of magnet misalignments, BPM errors, and emittance correction algorithm suggest the residual vertical emittance measured at the conclusion of the tuning procedure is dominated by sources other than optics errors and misalignments...

  17. Proceedings of the workshop on polarized targets in storage rings

    International Nuclear Information System (INIS)

    Polarization phenomena have played an increasingly important part in the study of nuclei and nucleons in recent years. Polarization studies have been hampered by the relatively few and rather fragile polarized targets which are presently available. The concept of polarized gas targets in storage rings opens a much wider range of possibilities than is available in the external target geometry. This novel method will represent a considerable advance in nuclear physics and will continue to receive much attention in plans for future facilities. An internal, polarized-target station is being planned for the cooler ring at the Indiana University Cyclotron Facility. Internal targets are compatible with recent designs of electron accelerators proposed by the Massachusetts Institute of Technology and the Southeastern Universities Research Association. The key to nuclear-science programs based on internal targets pivots on recent developments in polarized atomic beam methods, which include the more recent laser-driven polarized targets. The workshop drew together a unique group of physicists in the fields of high-energy, nuclear and atomic physics. The meeting was organized in a manner that stimulated discussion among the 58 participants and focused on developments in polarized target technology and the underlying atomic physics. An impressive array of future possibilities for polarized targets as well as current developments in polarized target technology were discussed at the workshop. Abstracts of individual items from the workshop were prepared separately for the data base

  18. EDM searches at storage rings with Wien filters

    International Nuclear Information System (INIS)

    Future searches of an EDM of protons and deuterons at COSY storage ring in Juelich, envision the use of Wien filter acting as spin rotator. Crucial idea is that Wien filter produces spin kicks which give a growth of the EDM signal. In all approaches one starts with the injection of the vertically polarized beam. Radiofrequency Wien filter modulates spin tune of stored particles. If EDM is non-zero this modulation conspires with the EDM-induced rotation of the spin in the motional electric field in the ring and generates the EDM signal - the in-plane horizontal polarization. We discuss the duality between RF spin flipper and RF Wien filter and we argue why spin coherence time is equal for two devices. Another case is static Wien filter with constant fields. Behavior of spin vector is the same, but the machine is operated exactly at imperfection resonance (for protons, Gγ=2), which drastically decreases spin coherence time. Last case is more promising but it needs supercompensated magnetic lattice, an option which has to be studied further.

  19. EDM searches at storage rings with Wien filters

    Energy Technology Data Exchange (ETDEWEB)

    Saleev, Artem [Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Nikolaev, Kolya [Landau Institute, Chernogolovka (Russian Federation); Collaboration: JEDI-Collaboration

    2013-07-01

    Future searches of an EDM of protons and deuterons at COSY storage ring in Juelich, envision the use of Wien filter acting as spin rotator. Crucial idea is that Wien filter produces spin kicks which give a growth of the EDM signal. In all approaches one starts with the injection of the vertically polarized beam. Radiofrequency Wien filter modulates spin tune of stored particles. If EDM is non-zero this modulation conspires with the EDM-induced rotation of the spin in the motional electric field in the ring and generates the EDM signal - the in-plane horizontal polarization. We discuss the duality between RF spin flipper and RF Wien filter and we argue why spin coherence time is equal for two devices. Another case is static Wien filter with constant fields. Behavior of spin vector is the same, but the machine is operated exactly at imperfection resonance (for protons, Gγ=2), which drastically decreases spin coherence time. Last case is more promising but it needs supercompensated magnetic lattice, an option which has to be studied further.

  20. The performance of the Los Alamos Proton Storage Ring

    International Nuclear Information System (INIS)

    The Proton Storage Ring (PSR) now in operation at Los Alamos is a high-current accumulator that generates intense 800-MeV proton pulses for driving the Los Alamos Neutron Scattering Center (LANSCE) spallation source. The ring compresses up to 1000-μs-long macropulses from the LAMPF linac into 250-ns bunches and ejects them to a neutron-production target, providing an output optimized for thermal-neutron-scattering research. The design pulse rate and peak pulse intensity of PSR are 12 Hz and 5.2 . 1013 protons per pulse (ppp), yielding 100 μA average current when full performance is reached. This paper summarizes commissioning results and operational experience in the two years since first beam. The PSR has operated in production at average currents up to 30 μA and has reached a peak intensity of 3.4 . 1013 ppp. These achievements represents 30% and 65% of the design objectives. Higher current production has been inhibited by beam losses during accumulation and extraction. Therefore, experiments to understand loss mechanisms have occupied a large fraction of the commissioning effort. Correction of an extraction-channel aperture restriction identified late in 1986 should dramatically reduce extraction losses, which will permit higher current production in 1987. Beam tests in the 1013-ppp range have indicated the presence of a collective instability tentatively identified as transverse. However, by suitable parameter adjustments, the instability threshold can be pushed above the top charge-level attainable with the existing H - source

  1. Dielectronic Recombination Experiments with Tungsten Ions at the Test Storage Ring and Development of a Single-Particle Detector at the Cryogenic Storage Ring

    OpenAIRE

    Spruck, K.

    2015-01-01

    This work is about electron-ion collision experiments at the ion storage rings of the Max Planck Institute for Nuclear Physics in Heidelberg. Absolute recombination rate coefficients of highly-charged tungsten ions featuring an open 4-f-shell structure have been measured at the heavy-ion storage ring TSR. The resulting plasma rate coefficients have been used to probe the significance of newly developed theoretical approaches. Plasma rate coefficients of highly-charged tungsten ions are in par...

  2. Dielectronic recombination experiments with tungsten ions at the test storage ring and development of a single-particle detector at the cryogenic storage ring

    OpenAIRE

    Spruck, K.

    2015-01-01

    This work is about electron-ion collision experiments at the ion storage rings of the Max Planck Institute for Nuclear Physics in Heidelberg. Absolute recombination rate coefficients of highly-charged tungsten ions featuring an open 4-f-shell structure have been measured at the heavy-ion storage ring TSR. The resulting plasma rate coefficients have been used to probe the significance of newly developed theoretical approaches. Plasma rate coefficients of highly-charged tungsten ions are in par...

  3. A polarized gas internal target using a storage cell in an electron storage ring

    International Nuclear Information System (INIS)

    The first experiment using a storage cell to increase the thickness of an internal polarized gas target in an electron beam storage ring was performed at the VEPP-3 facility. We describe the storage cell technique as applied in this measurement of elastic and inelastic electron scattering from tensor polarized deuterium. An analysis of electron-beam-induced depolarization of the target was performed and experimental tests were carried out which verify the effect. Other effects causing depolarization of the target are discussed as well as the means by which they are overcome. The effective pzz of the target, shown to be stable over 8 months, was 0.57±0.05; the total target thickness was increased over that of a jet target by a factor of fifteen. (orig.)

  4. Separatrix distortion and correction of nonlinear synchrotron oscillations in electron storage rings

    International Nuclear Information System (INIS)

    The influence of high-order terms of momentum compaction factor on beam longitudinal oscillations in electron storage rings is studied. It is shown that nonlinear terms lead to separatrix distortion and as a result to the beam lifetime reduction. The obtained results are applied for calculation of beam real lifetime in the CANDLE(accelerator)storage ring

  5. Conceptual design of elliptical cavities for intensity and position sensitive beam measurements in storage rings

    CERN Document Server

    Sanjari, M S; Hülsmann, P; Litvinov, Yu A; Nolden, F; Piotrowski, J; Steck, M; Stöhlker, Th

    2015-01-01

    Position sensitive beam monitors are indispensable for the beam diagnostics in storage rings. Apart from their applications in the measurements of beam parameters, they can be used in non-destructive in-ring decay studies of radioactive ion beams as well as enhancing precision in the isochronous mass measurement technique. In this work, we introduce a novel approach based on cavities with elliptical cross-section, in order to compensate for existing limitations in ion storage rings. The design is aimed primarily for future heavy ion storage rings of the FAIR project. The conceptual design is discussed together with simulation results.

  6. Central RF frequency measurement of the HLS-II storage ring

    Science.gov (United States)

    Jia-Jun, Zheng; Yong-Liang, Yang; Bao-Gen, Sun; Fang-Fang, Wu; Chao-Cai, Cheng; Kai, Tang; Jun-Hao, Wei

    2016-04-01

    Central RF frequency is a key parameter of storage rings. This paper presents the measurement of central RF frequency of the HLS-II storage ring with the sextupole modulation method. Firstly, the basis of central RF frequency measurement of the electron storage ring is briefly introduced. Then, the error sources and the optimized measurement method for the HLS-II storage ring are discussed. The workflow of a self-compiled Matlab script used in central RF frequency measurement is also described. Finally, the results achieved by using two data processing methods to cross-check each other are shown. The measured value of the central RF frequency demonstrates that the circumference deviation of the HLS-II storage ring is less than 1 mm. Supported by National Natural Science Foundation of China (11105141, 11175173) and the upgrade project of Hefei Light Source

  7. Commissioning of the Cryogenic Plant for the Cryogenic Storage Ring (CSR) at Heidelberg

    CERN Document Server

    von Hahn, R; Grieser, M; Haberstroh, C; Kaiser, D; Lange, M; Laux, F; Menk, S; Orlov, D A; Repnow, R; Sieber, T; Quack, H; Varju, J; Wolf A

    2009-01-01

    At the Max-Planck-Institute for Nuclear Physics in Heidelberg a next generation electrostatic storage ring for low velocity atomic and molecular ion beams is under construction. In contrast to existing electrostatic storage rings, the Cryogenic Storage Ring CSR will be cooled down to temperatures below 2 K. Thus acting as a large cryopump it will provide long storage times and, in addition, open a new field of quantum state controlled molecular physics due to a low heat radiation background from space-like environment. A concept for cooling the storage ring has been developed and is presently tested by means of a linear trap as a prototype with a length of 1/10 of the planned ring. A commercial refrigerator with 21 W at 2 K has been successfully commissioned and was connected to the prototype. This paper presents the status of the cryogenic plant after the commissioning and one year of operation.

  8. Implications of longitudinal emittance dilution for HIF storage ring driver schemes

    International Nuclear Information System (INIS)

    The role is discussed of transverse and longitudinal emittance dilutions during the injection, debunching, compression, extraction and transport stages in storage rings for HIF drivers. The question of dilution effects at the space-charge levels is also considered. Possible storage ring schemes are examined and arrangements for bunch compression rings and final beam lines considered. Limitations on possible designs due to dilution effects are given. (U.K.)

  9. QCD physics at hadron storage rings: From COSY to FAIR

    Indian Academy of Sciences (India)

    James Ritman

    2006-05-01

    As a result of the rapid rise of the coupling constant at low momentum transfers, perturbation theory is not an appropriate method to describe the strong interaction. In this kinematic regime other methods such as lattice QCD or effective field theories are more appropriate to investigate the appearance of a still unsettled phenomena: confinement and chiral symmetry breaking. Furthermore, the confinement of quarks and gluons to hadrons allows crucial tests of fundamental symmetries that are inherent to the QCD Lagrangian but are broken in hadronic systems. Thus, high precision measurements of the production and decay of specific hadronic states provides decisive benchmarks to investigate the properties of QCD in this regime. A new series of experiments are being prepared using nearly full acceptance detectors for neutral and charged particles around internal targets in high intensity, phase-space-cooled hadronic beams. Later this year, it is planned to transfer the WASA detector from the CELSIUS to the COSY ring in order to measure the production and various decay channels of the and ' mesons, thereby investigating the violation of P, C, T, and combinations thereof, as well as isospin violation. The experimental and theoretical techniques employed here will provide an important basis to extend these investigations to the static and dynamical properties of hadrons with charm quark content with the high energy storage ring for antiprotons at the new GSI/FAIR facility. Additional related perspectives will be opened at the new facility ranging from the properties of hadrons in dense nuclear matter to measurements of the nucleon's transverse spin distribution in the valence quark region using polarized antiprotons.

  10. Searching for the electron EDM in a storage ring

    International Nuclear Information System (INIS)

    Searches for permanent electric dipole moments (EDM) of fundamental particles have been underway for more than 50 years with null results. Still, such searches are of great interest because EDMs arise from radiative corrections involving processes that violate parity and time-reversal symmetries, and through the CPT theorem, are sensitive to CP-violation. New models of physics beyond the standard model predict new sources of CP-violation leading to dramatically enhanced EDMs possibly within the reach of a new generation of experiments. We describe a new approach to electron EDM searches using molecular ions stored in a tabletop electrostatic storage ring. Molecular ions with long-lived paramagnetic states such as tungsten nitride WN+ can be injected and stored in larger numbers and with longer coherence times than competing experiments, leading to high sensitivity to an electron EDM. Systematic effects mimicking an EDM such as those due to motional magnetic fields and geometric phases are found not to limit the approach in the short term, and sensitivities of δ|de| ∼ 10-30 e·cm/day appear possible under conservative conditions.

  11. Searching for the electron EDM in a storage ring

    Science.gov (United States)

    Kawall, D.

    2011-05-01

    Searches for permanent electric dipole moments (EDM) of fundamental particles have been underway for more than 50 years with null results. Still, such searches are of great interest because EDMs arise from radiative corrections involving processes that violate parity and time-reversal symmetries, and through the CPT theorem, are sensitive to CP-violation. New models of physics beyond the standard model predict new sources of CP-violation leading to dramatically enhanced EDMs possibly within the reach of a new generation of experiments. We describe a new approach to electron EDM searches using molecular ions stored in a tabletop electrostatic storage ring. Molecular ions with long-lived paramagnetic states such as tungsten nitride WN+ can be injected and stored in larger numbers and with longer coherence times than competing experiments, leading to high sensitivity to an electron EDM. Systematic effects mimicking an EDM such as those due to motional magnetic fields and geometric phases are found not to limit the approach in the short term, and sensitivities of δ|de| ≈ 10-30 e·cm/day appear possible under conservative conditions.

  12. Design and erection of the storage ring ANKA

    International Nuclear Information System (INIS)

    The storage ring ANKA has been designed to meet the requirements of its main users: the LIGA technique and the analytical applications. According to this ANKA has to provide photons with an energy of up to 30 keV with a medium emittance (50 to 90 nm . rad), but with a high photon flux which corresponds to a stored beam of 400 mA. The nominal energy of ANKA is 2.5 GeV with a magnetic flux in the bendings of 1,5 T. To reach the emittance a classical DBA-structure over an angle of 45 degree has been used. ANKA has a circumference of 110.4 m with 4 long straight sections (5.6 m long) for the accomodation of future insertion devices and 4 short straight section (2.2 m) for the r. f. as well as the injection system. The injector is a 500 MeV booster synchrotron with a 53 MeV racetrack microtron as a pre-injector. (orig.)

  13. Long-term stability of the APS storage ring

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS), a third-generation synchrotrons light source, was commissioned in 1995 at Argonne ''National Laboratory and has been fully-operational for beamline users since 1997. The APS storage ring can accommodate up to 68 user beamlines; about 70% of the available beamlines are currently in use by various collaborative access teams (CATS). The 7-GeV synchrotrons light source produces light in the soft to hard x-ray range that is used for research in such areas as x-ray instrumentation; material, chemical and atomic sciences; biology; and geo/soil/ environmental sciences. For the successful operation of an x-ray light source such as the Advanced Photon Source, the long-term stability of the concrete floor supporting the beam components and user beamlines is crucial. Settlements impact the orbit and location of the x-ray source points as well as the position of the x-ray beamlines. This paper compares the results of two successive resurveys of the APS accelerator components performed in 1995 and 1998

  14. Initial scientific uses of coherent synchrotron radiation inelectron storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Basov, D.N.; Feikes, J.; Fried, D.; Holldack, K.; Hubers, H.W.; Kuske, P.; Martin, M.C.; Pavlov, S.G.; Schade, U.; Singley, E.J.; Wustefeld, G.

    2004-11-23

    The production of stable, high power, coherent synchrotron radiation at sub-terahertz frequency at the electron storage ring BESSY opens a new region in the electromagnetic spectrum to explore physical properties of materials. Just as conventional synchrotron radiation has been a boon to x-ray science, coherent synchrotron radiation may lead to many new innovations and discoveries in THz physics. With this new accelerator-based radiation source we have been able to extend traditional infrared measurements down into the experimentally poorly accessible sub-THz frequency range. The feasibility of using the coherent synchrotron radiation in scientific applications was demonstrated in a series of experiments: We investigated shallow single acceptor transitions in stressed and unstressed Ge:Ga by means of photoconductance measurements below 1 THz. We have directly measured the Josephson plasma resonance in optimally doped Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} for the first time and finally we succeeded to confine the sub-THz radiation for spectral near-field imaging on biological samples such as leaves and human teeth.

  15. Historic moment as SESAME begins storage ring installation

    CERN Multimedia

    JORDAN

    2016-01-01

    The first of the 16 cells of SESAME (link is external)’s storage ring was installed recently in the shielding tunnel in the Centre’s experimental hall in Allan, Jordan. SESAME will be the Middle East’s first synchrotron light source. The installation was led by SESAME’s Technical Director, Erhard Huttel, with help from members of CERN forming part of the CESSAMag (CERN-EC Support for SESAME Magnets) team as well as scientists and technicians from the SESAME region. Each cell consists of magnets (dipole, quadrupoles and sextupoles) and the vacuum chamber, supported by a girder. After many years in the making, commissioning of SESAME is scheduled to begin in 2016, serving a growing community of some 300 scientists from the region. The initial research programme will cover topics as diverse as the search for new cancer drugs to the exploration of the regions shared cultural heritage. SESAME is also a pioneer in promoting international cooperation in the region. The laboratory is expected

  16. Global coupling and decoupling of the APS storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Chae, Yong-Chul; Liu, Jianyang; Teng, L.C.

    1995-07-01

    This Paper describes a study of controlling the coupling between the horizontal and the vertical betatron oscillations in the APS storage ring. First, we investigate the strengthening of coupling using two families of skew quadrupoles. Using smooth approximation, we obtained the formulae to estimate the coupling ratio defined as the ratio of the vertical and horizontal emittances or, for a single particle, the ratio of the maximum values of the Courant Snyder invariants. Since we knew that the coupling is mostly enhanced by the 21st harmonic content of skew quadrupole distribution, we carried out the harmonic analysis in order to find the optimum arrangement of the skew quadrupoles. The numerical results from tracking a single particle are presented for the various configurations of skew quadrupoles. Second, we describe the global decoupling procedure to minimize the unwanted coupling effects. These are mainly due to the random roll errors of normal quadrupoles. It is shown that even with the rather large rms roll error of 2 mrad we can reduce the Coupling from 70 percent to 10 percent with a skew quadrupole strength which is one order of magnitude lower than the typical normal quadrupole strength.

  17. Millimeter wave coherent synchrotron radiation in a compact storage ring

    International Nuclear Information System (INIS)

    Installation of a 2,856 MHz RF system into the XLS compact electron storage ring would allow the generation of millimeter wave coherent synchrotron radiation. Operating at 150 MeV, one could produce bunches containing on the order of 2 x 107 electrons with a bunch length σL0 = 0.3 mm, resulting in coherent emission at wavelengths above 0.8 mm. The characteristics of the source and the emitted radiation are discussed. In the case of 100 mrad horizontal collection angle, the average power radiated in the wavelength band 1 mm ≤ λ ≤ 2 mm is 0.3 mW for single bunch operation and 24 mW for 80 bunch operation. The peak power in a single pulse of a few picosecond duration is on the order of one watt. By reducing the momentum compaction, the bunch length could be reduced to σL0 = 0.15 mm, resulting in coherent synchrotron radiation down to 500 microm

  18. Fast COD data acquisition at the SPring-8 storage ring

    International Nuclear Information System (INIS)

    A stabilization of a beam orbit is one of important topics for synchrotron radiation accelerators. A periodic correction of a closed orbit of electron beam takes central role in the beam orbit stabilization, after major causes of beam orbit fluctuations were cured. Electronics of beam position monitor at the SPring-8 storage ring, which are in operation since 2006, have capability of re-configuration in signal detection scheme, since the electronics is composed of DSP and FPGA. We reconfigured the electronics and COD data at a repetition of every 1 ms is obtained as post-process. This 1 ms COD data is analyzed and the beam orbit fluctuation was evaluated. While the post-processing data, we have been developing software for periodic correction of the beam orbit in order to shortening the period of the correction. The period was shortened from 7 sec to 1 sec since 2012 April. After that we prepared reflective memory network which have good real time property. Owing to the reflective memory network, it have become possible that the COD data is obtained at 10 Hz with real-time. Moreover, the obtained 10-Hz COD data is recorded to a database system, which is newly developed as MADOCA II control system for future SPring-8 database. We report upgrading of the hardware and software for COD measurement and status of COD correction. (author)

  19. Planning and Prototyping for a Storage Ring Measurement of the Proton Electric Dipole Moment

    Energy Technology Data Exchange (ETDEWEB)

    Talman, Richard [Cornell Univ., Ithaca, NY (United States)

    2015-07-01

    Electron and proton EDM's can be measured in "frozen spin" (with the beam polarization always parallel to the orbit, for example) storage rings. For electrons the "magic" kinetic energy at which the beam can be frozen is 14.5 MeV. For protons the magic kinetic energy is 230 MeV. The currently measured upper limit for the electron EDM is much smaller than the proton EDM upper limit, which is very poorly known. Nevertheless, because the storage ring will be an order of magnitude cheaper, a sensible plan is to first build an all-electric electron storage ring as a prototype. Such an electron ring was successfully built at Brookhaven, in 1954, as a prototype for their AGS ring. This leaves little uncertainty concerning the cost and performance of such a ring. (This is documentedin one of the Physical Review papers mentioned above.)

  20. The ASTRID Project: Status and Future Prospects

    International Nuclear Information System (INIS)

    The ASTRID objectives: → Industrial technology demonstrator; → Integrating French and international SFRs feedback; → A GEN IV system: Safety: - Level at least equivalent to GEN III systems (WENRA requirements); - With significant improvements on Na reactors specificities issues; - Integrating FUKUSHIMA accident feedback. Operability: - Load factor of 80% or more after first “learning” years; - Significant improvements concerning In Service Inspection & Repair (ISIR). Ultimate wastes transmutation: - Continue experimentation on minor actinides transmutation, up to large scales if decided, according to June 28, 2006 French Act on Wastes Management; - A mastered investment cost. → Irradiation services and testing long term options

  1. Electron cloud development in the Proton Storage Ring and in the Spallation Neutron Source

    OpenAIRE

    Pivi, M.T.F.; Furman, M.A.

    2002-01-01

    We have applied our simulation code "POSINST" to evaluate the contribution to the growth rate of the electron-cloud instability in proton storage rings. Recent simulation results for the main features of the electron cloud in the storage ring of the Spallation Neutron Source (SNS) at Oak Ridge, and updated results for the Proton Storage Ring (PSR) at Los Alamos are presented in this paper. A key ingredient in our model is a detailed description of the secondary emitted-electron energy sp...

  2. Analytical Approach to Eigen-Emittance Evolution in Storage Rings

    International Nuclear Information System (INIS)

    This dissertation develops the subject of beam evolution in storage rings with nearly uncoupled symplectic linear dynamics. Linear coupling and dissipative/diffusive processes are treated perturbatively. The beam distribution is assumed Gaussian and a function of the invariants. The development requires two pieces: the global invariants and the local stochastic processes which change the emittances, or averages of the invariants. A map based perturbation theory is described, providing explicit expressions for the invariants near each linear resonance, where small perturbations can have a large effect. Emittance evolution is determined by the damping and diffusion coefficients. The discussion is divided into the cases of uniform and non-uniform stochasticity, synchrotron radiation an example of the former and intrabeam scattering the latter. For the uniform case, the beam dynamics is captured by a global diffusion coefficient and damping decrement for each eigen-invariant. Explicit expressions for these quantities near coupling resonances are given. In many cases, they are simply related to the uncoupled values. Near a sum resonance, it is found that one of the damping decrements becomes negative, indicating an anti-damping instability. The formalism is applied to a number of examples, including synchrobetatron coupling caused by a crab cavity, a case of current interest where there is concern about operation near half integer νx. In the non-uniform case, the moment evolution is computed directly, which is illustrated through the example of intrabeam scattering. Our approach to intrabeam scattering damping and dicusion has the advantage of not requiring a loosely-defined Coulomb Logarithm. It is found that in some situations there is a small difference between our results and the standard approaches such as Bjorken-Mtingwa, which is illustrated by comparison of the two approaches and with a measurement of Au evolution in RHIC. Finally, in combining IBS with the

  3. Analytical Approach to Eigen-Emittance Evolution in Storage Rings

    Energy Technology Data Exchange (ETDEWEB)

    Nash, Boaz; /SLAC

    2006-05-16

    This dissertation develops the subject of beam evolution in storage rings with nearly uncoupled symplectic linear dynamics. Linear coupling and dissipative/diffusive processes are treated perturbatively. The beam distribution is assumed Gaussian and a function of the invariants. The development requires two pieces: the global invariants and the local stochastic processes which change the emittances, or averages of the invariants. A map based perturbation theory is described, providing explicit expressions for the invariants near each linear resonance, where small perturbations can have a large effect. Emittance evolution is determined by the damping and diffusion coefficients. The discussion is divided into the cases of uniform and non-uniform stochasticity, synchrotron radiation an example of the former and intrabeam scattering the latter. For the uniform case, the beam dynamics is captured by a global diffusion coefficient and damping decrement for each eigen-invariant. Explicit expressions for these quantities near coupling resonances are given. In many cases, they are simply related to the uncoupled values. Near a sum resonance, it is found that one of the damping decrements becomes negative, indicating an anti-damping instability. The formalism is applied to a number of examples, including synchrobetatron coupling caused by a crab cavity, a case of current interest where there is concern about operation near half integer {nu}{sub x}. In the non-uniform case, the moment evolution is computed directly, which is illustrated through the example of intrabeam scattering. Our approach to intrabeam scattering damping and diffusion has the advantage of not requiring a loosely-defined Coulomb Logarithm. It is found that in some situations there is a small difference between our results and the standard approaches such as Bjorken-Mtingwa, which is illustrated by comparison of the two approaches and with a measurement of Au evolution in RHIC. Finally, in combining IBS

  4. Users program for storage-ring based FEL and synchrotron sources of the Duke FEL Laboratory

    Energy Technology Data Exchange (ETDEWEB)

    Straub, K.D.; Barnett, G.; Burnham, B. [and others

    1995-12-31

    The storage ring at the Duke FEL Laboratory was first operated with a stored e-beam in November, 1994. It has now achieved operation energies in excess 1 GeV with more than 100 mA current at 280 MeV. The ring has several ports for FEL and synchrotron light source research. The circulating ring current can be synchronized with the seperate Mark III FEL operating in the 2-9.5 {mu}m IR region. This allows low optical jitter (10-20 ps) between the two sources and thus pump-probe operation. The ring has been configured to drive a number of light sources including the OK-4 FEL system capable of FEL operation between 400 and 65 nm, an inverse Compton scattering source using this undulator which will yield 4-200 MeV gammas, an undulator source at approximately 40 {angstrom} (not an FEL), a mm FEL with inverse compton scattering providing 1-100 keV x-rays and two synchrotron ports from the bend magnets for which the {lambda}{sub c} = 11-12 {angstrom} for 1 GeV. The broadly tunable FEL sources and their associated inverse compton scattering are extremely bright. The initial research proposals, submitted to the Laboratory emphasizes photoelectron spectroscopy, PEEM, high resolution vacuum UV of gases, solid spectroscopy and photochemistry in the UV, X-ray microprobe studies, X-ray microscopy, X-ray holography, X-ray crystallography, Mossbauer spectroscopy, nuclear spectroscopy, neutron production, photon activation therapy and broadband synchrotron as a probe of fast reaction in the IR and near IR.

  5. Ring wall storages. An essential contribution of the geotechnics to te energy storage; Ringwallspeicher. Ein essentieller Beitrag der Geotechnik zur Energiespeicherung

    Energy Technology Data Exchange (ETDEWEB)

    Popp, Matthias [Matthias Popp Ingenieurbuero Erneuerbare Energien, Energiespeicherung, Wuppertal (Germany)

    2012-11-01

    The author of the contribution under consideration reports on ring wall storages as an essential contribution to the geotechnical engineering for energy storage. At first, renewable energies as well as the storage requirements for the compensation of the volatility of electricity from wind power and solar energy are described. Subsequently, the storage technologies for energy management requirements as well as the need for water and land area of pumped storage systems are presented with special emphasis of ring wall storages.

  6. A progress report on the g-2 storage ring magnet system

    International Nuclear Information System (INIS)

    The 3.1 GeV muon storage ring for the g-2 experiment at Brookhaven National Laboratory hat three large solenoid magnets that form a continuous 1.451 tesla storage ring dipole with an average beam bond radius of 7.1 metors. In addition to the three storage ring solenoids, there is an inflector dipole with nested dipole coils that create very little stray magnetic field. A superconducting shield on the infractor gets rid of most of the remaining stray flux. This paper reports on the progress made on the storage ring solenoid magnet system and the inflector as of June 1995. The results of cryogenic system tests are briefly reported

  7. Theory and analysis of nonlinear dynamics and stability in storage rings: A working group summary

    Energy Technology Data Exchange (ETDEWEB)

    Chattopadhyay, S.; Audy, P.; Courant, E.D.; Forest, E.; Guignard, G.; Hagel, J.; Heifets, S.; Keil, E.; Kheifets, S.; Mais, H.; Moshammer, H.; Pellegrini, C.; Pilat, F.; Suzuki, T.; Turchetti, G.; Warnock, R.L.

    1988-07-01

    A summary and commentary of the available theoretical and analytical tools and recent advances in the nonlinear dynamics, stability and aperture issues in storage rings are presented. 11 refs., 4 figs.

  8. BPM system and its development for the storage ring of NSRRC

    International Nuclear Information System (INIS)

    The storage ring of NSRRC is a 1.5 GeV synchrotron light source. About 60 BPMs (beam position monitors) were installed in the storage ring. High precision closed orbits were measured by Bergoz's MX-BPMs. Data were acquired by multichannel 16-bit ADC modules. The orbit data was sampled every millisecond. Fast orbit data were shared by reflective memory network to support fast orbit feedback. The Averaged data were updated to control database at a rate of 10 Hz. Turn-by-turn beam position signals were processed by several Bergoz's log-ratio BPMs and recorded by a transient digitizer to support various beam physics study. Digital BPMs were installed at the storage ring to improve the BPM system functionality at the storage ring, supporting routine operation and study of beam physics. The system structure, software environment and performance of the BPM system are summarized in this report

  9. ETEAPOT: symplectic orbit/spin tracking code for all-electric storage rings

    CERN Document Server

    Talman, Richard M

    2015-01-01

    Proposed methods for measuring the electric dipole moment (EDM) of the proton use an intense, polarized proton beam stored in an all-electric storage ring "trap". At the "magic" kinetic energy of 232.792 MeV, proton spins are "frozen", for example always parallel to the instantaneous particle momentum. This paper describes an accelerator simulation code, ETEAPOT, a new component of the Unified Accelerator Libraries (UAL), to be used for long term tracking of particle orbits and spins in electric bend accelerators, in order to simulate EDM storage ring experiments. Though qualitatively much like magnetic rings, the non-constant particle velocity in electric rings give them significantly different properties, especially in weak focusing rings. Like the earlier code TEAPOT (for magnetic ring simulation) this code performs \\emph{exact tracking in an idealized (approximate) lattice} rather than the more conventional approach, which is \\emph{approximate tracking in a more nearly exact lattice.} The BMT equation des...

  10. Insertion design for e/sup +/e/sup -/ storage rings

    CERN Document Server

    Hutton, A

    1979-01-01

    The insertion design of an e/sup +/e/sup -/ storage ring determines not only the physics potential of the facility but also the basic machine parameters, and considerable economies can be made by suitably tailoring the insertions to the detector requirements. This paper shows how the use of specialized insertions can improve the machine characteristics and discusses the solution adopted for LEP, the large e/sup +/e/sup -/ storage rings currently under study at CERN. (10 refs).

  11. Response of Charged Particles in a Storage Ring to Gravitational Waves

    Institute of Scientific and Technical Information of China (English)

    DONGDong; HUANGChao-Guang

    2003-01-01

    The influence of gravitational waves on the charged particles in a storage ring is studied. It shows that the gravitational waves might be directly detected by monitoring the motion of charged particles in a storage ring. The angular velocity of the charged particles is continually adjustable by changing the initial energy of particles and the strength of the magnetic field. This feature is very useful for finding the gravitational waves with different frequencies.

  12. Response of Charged Particles in a Storage Ring to Gravitational Waves

    Institute of Scientific and Technical Information of China (English)

    DONG Dong; HUANG Chao-Guang

    2003-01-01

    The influence of gravitational waves on the charged particles in a storage ring is studied. It shows thatthe gravitational waves might be directly detected by monitoring the motion of charged particles in a storage ring. Theangular velocity of the charged particles is continually adjustable by changing the initial energy of particles and thestrength of the magnetic field. This feature is very useful for finding the gravitational waves with different frequencies.

  13. Electron impact ionization measurements at the Heidelberg heavy ion storage ring TSR

    International Nuclear Information System (INIS)

    Reliable rate coefficients are needed in order to model the charge state distributions (CSDs) of astrophysical plasmas. We are carrying out electron impact ionization (EII) measurements for astrophysically important ions using the heavy ion Test Storage Ring (TSR) at the Max-Planck Institute for Nuclear Physics in Heidelberg, Germany. These storage ring measurements provide unambiguous data from essentially pure ground-state ion beams.

  14. An analysis of the long-term stability of the particle dynamics in hadron storage rings

    International Nuclear Information System (INIS)

    This thesis extends the stability analysis of the particle motion in a storage ring and estimates the diffusion rates well inside the dynamic aperture. The calculation of the drift and diffusion coefficients focuses on an application to the proton storage ring in HERA, where the proton beam lifetime drops considerably after the proton and electron beams are brought to collision. The analysis shows that the combined effect of slow and fast modulation frequencies leads to an increased emittance growth in the storage ring. HERA the slow frequency components are caused by ground motion in the HERA tunnel and the fast frequency components by ripples in the power supplies. The thesis provides upper limits for the modultion depths of a fast tune modulation which result in tolerable growth rates for the proton emittance. The analytically calculated drift coefficients agree numerical simulations for the particle dynamics. A comparison of the calculated drift coefficients with those measured in the HERA proton storage ring shows that the analyzed mechanism can lead to growth rates of the same order of magnitude as the ones measured during the luminosity operation in the HERA storage ring. Analytical estimates for the proton growth rates predict a high sensitivity to the particle diffusion on the frequency components of the fast fast tune modulation. This prediction was confirmed by a subsequent modulation experiment in the proton storage ring of HERA, where an external tune modulation with fast frequency components led to a drastic increase in the growth rates

  15. A conceptual study of the proton storage ring for the Neutron Science Project at JAERI

    International Nuclear Information System (INIS)

    Japan Atomic Energy Research Institute, JAERI, has been proposing the Neutron Science Project (NSP) which is composed of research facilities based on a proton linac and a proton storage ring with an energy of 1.5 GeV. The proposed NSP is aiming at exploring new basic researches and nuclear technologies such as condensed matter physics and nuclear waste transmutation based on a proton accelerator. In the proton storage ring, the pulsed beam from the linac is accumulated, and high intensity pulsed beam is produced for the neutron scattering experiment. The goal of the proton storage ring is to provide a short pulsed proton beam of less than 1 μs with an average beam power of 5 MW with two rings. The study of the proton storage ring whose beam power is 2.5 MW has been performed. The proton storage ring is consisted of the High Energy Beam Transport (HEBT) line which connects the 1.5 GeV linac to the ring and the proton storage ring which really accumulates the protons. The beam coming out of the linac is a 1.5 GeV H beam and 1.86 ms long with a peak current of 30 mA. The beam is chopped to the pulse length of 400 ns with 270 ns gap. The beam is compressed by means of a multi-turn charge exchange injection. When a harmonic number of the ring is 1, a circumference and a revolution frequency are 185.4 m and 1.49 MHz, respectively. The single bunch in the ring is contained by rf cavity. To achieve a beam power of 2.5 MW with this beam structure, it is necessary to accumulate 2777 bunches. This corresponds to 2.08 x 1014 protons. When the beam injection is completed, accumulated protons are extracted from the ring during 1 turn. The average current circulating in the ring with 1.49 MHz revolution frequency becomes 49.75 A. At such a high average current, a beam loss of a very small fraction makes a very high radioactivity around the ring. It is necessary to examine reduction and localization of the beam loss with sufficient consideration of the divergence of the beam by

  16. A practical method to generate brilliant hard x-rays with a tabletop electron storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Yamada, H. [Ritsumeikan Univ., Shiga (Japan); Amano, D.; Miyade, H. [Sumitomo Heavy Industries, Ltd., Tanashi-City (Japan)

    1995-12-31

    With electron storage rings not only synchrotron radiation(SR) but also bremsstrahlung(BS) from a thin target placed in the electron orbit are mechanisms to generate brilliant x-ray beams. The calculated brilliance of BS with a 50 MeV storage ring, which is nearly 10{sup 13} photons/s, mrad{sup 2}, mm{sup 2}, 0.1% band width for 100 keV x-rays, exceeds that of SR from a 1 GeV storage ring. This photon energy spectrum is almost constant and extend up to the electron energy. The reasons for this high brilliance with this new radiation scheme is that the electron beams penetrating the thin target are utilized repeatedly, the narrow angular divergence of BS is determined by the kinematics of relativistic electron as same as SR, and the x-ray source size of the order of 1 {mu}m is determined by the size of thin target instead of electron beam sizes. Continuous injection of electron beam to the storage ring at full energy is the way to keep high and constant beam current. Peak current and repetition rate determine x-ray out put power. Note that the power of x-ray beam is also provided from a RF cavity of the storage ring. In this paper we will report some experimental results and discuss further application on a coherent bremsstrahlung generated from a set of stacked foils placed in the electron orbit of the ring. Resulting from these investigations the photon storage ring which is based on a 50 MeV exact circular electron storage ring could provide wide range of coherent and incoherent radiations from far infrared to hard x-ray in a practical amount of radiation power.

  17. A review of methods for experimentally determining linear optics in storage rings

    International Nuclear Information System (INIS)

    In order to maximize the brightness and provide sufficient dynamic aperture in synchrotron radiation storage rings, one must understand and control the linear optics. Control of the horizontal beta function and dispersion is important for minimizing the horizontal beam size. Control of the skew gradient distribution is important for minimizing the vertical size. In this paper, various methods for experimentally determining the optics in a storage ring will be reviewed. Recent work at the National Synchrotron Light Source X-Ray Ring will be presented as well as work done at laboratories worldwide

  18. Status of ASTRID architecture and pre-conceptual design

    International Nuclear Information System (INIS)

    In the frame of the June 2006 French act on sustainable management of radioactive materials and wastes, the ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) reactor aims to demonstrate, from the 2020’s, at the industrial scale, improvements in the identified fields of progress of Sodium-cooled Fast Reactor (safety, operability, economy) and to perform transmutation demonstration. CEA (French Commission for Atomic Energy and Alternative Energy) is the leader of the ASTRID project, including ten industrial partnerships and EDF SEPTEN for architectural engineering design support. This document presents the status of the ASTRID pre-conceptual and global industrial design. All of the options of processing systems studied by the industrial engineering partners are managed in configuration models, and monitored by a CEA ASTRID project management team. Items addressed in this document include views of nuclear island buildings, other operational and process buildings, projected site layout with requirements and specific constraints (external hazards like earthquake, floods, airplanes crashes…). (author)

  19. Post-Fukushima lessons and safety orientations for ASTRID

    International Nuclear Information System (INIS)

    The Fukushima accident occurred quite simultaneously with the launching of ASTRID preconceptual design phase (March 2011). Thus the workprogram has been able to take into account the main lessons from the Fukushima accident at the very early stages of ASTRID project. The paper presents the main lessons retained from the Fukushima accident, and the safety orientations deduced for ASTRID design. The major items are identified with a focus on the consideration of natural hazards, and the post-accidental management. On each item, safety orientations defined for ASTRID are presented. One of the most important orientation concerns the consideration of extreme natural hazards with the objective to increase safety margin before cliff-edge effect in terms of radiological releases into the environment. Principles for identifying among the safety provisions a “hardened safety core” of features resistant to extreme natural hazards are described. In this context, favorable intrinsic behavior of the concept is underlined. (author)

  20. Storage ring meets astrophysics: Dielectronic recombination of L-shell and M-shell iron ions

    International Nuclear Information System (INIS)

    A status report is given on an ongoing experimental effort to provide reliable rate coefficients for dielectronic recombination of highly charged iron ions for the modeling of astrophysical and other plasmas. The experimental work has been carried out at the Heidelberg heavy-ion storage-ring TSR.

  1. Storage life of silicone rubber sealing ring used in solid rocket motor

    Institute of Scientific and Technical Information of China (English)

    Liu Weikai; He Guoqiang

    2014-01-01

    It is urgent to carry out detailed research on storage performance of rubber sealing ring to get the criterion for its storage life. This paper acquires material ageing regularity by theoretical analysis and experimental confirmation. On this condition, failure mode and failure criterion of typ-ical sealing structure is studied, and the failure mechanism is found. Thus by analyzing the stress distribution, the relationship between ageing state and sealing condition is established. Rationaliza-tion proposal is put forward and storage life of sealing ring is evaluated. The research mentioned-above has special reference to the design of sealing structures and can provide reference for prolong-ing their service life.

  2. Storage life of silicone rubber sealing ring used in solid rocket motor

    Directory of Open Access Journals (Sweden)

    Liu Weikai

    2014-12-01

    Full Text Available It is urgent to carry out detailed research on storage performance of rubber sealing ring to get the criterion for its storage life. This paper acquires material ageing regularity by theoretical analysis and experimental confirmation. On this condition, failure mode and failure criterion of typical sealing structure is studied, and the failure mechanism is found. Thus by analyzing the stress distribution, the relationship between ageing state and sealing condition is established. Rationalization proposal is put forward and storage life of sealing ring is evaluated. The research mentioned-above has special reference to the design of sealing structures and can provide reference for prolonging their service life.

  3. TSR: A storage and cooling ring for HIE-ISOLDE

    Science.gov (United States)

    Butler, P. A.; Blaum, K.; Davinson, T.; Flanagan, K.; Freeman, S. J.; Grieser, M.; Lazarus, I. H.; Litvinov, Yu. A.; Lotay, G.; Page, R. D.; Raabe, R.; Siesling, E.; Wenander, F.; Woods, P. J.

    2016-06-01

    It is planned to install the heavy-ion, low-energy ring TSR, currently at the Max-Planck-Institute for Nuclear Physics in Heidelberg, at the HIE-ISOLDE facility in CERN, Geneva. Such a facility will provide a capability for experiments with stored, cooled secondary beams that is rich and varied, spanning from studies of nuclear ground-state properties and reaction studies of astrophysical relevance, to investigations with highly-charged ions and pure isomeric beams. In addition to experiments performed using beams recirculating within the ring, the cooled beams can be extracted and exploited by external spectrometers for high-precision measurements. The capabilities of the ring facility as well as some physics cases will be presented, together with a brief report on the status of the project.

  4. Superconducting correction magnets for the HERA proton storage ring

    International Nuclear Information System (INIS)

    The HERA proton ring is equipped with superconducting dipole and quadrupole magnets. The adjustment of the working point and the chromaticity correction are provided by quadrupole and sextupole correction coils which are mounted on the cold beam pipe inside the main dipole magnets. The coils are fixed on the pipe by epoxy and a strong glass fiber wrapping. The orbit correction in the proton ring is made by means of superferric correction dipoles which are mounted in common cyrostats with the main quadrupoles and beam position monitors. The layout of both types of correction magnets will be described and experimental results on quench behaviour and field quality will be presented

  5. Low Energy Storage Rings: Opening Routes for Beyond State-of-the-art Research

    International Nuclear Information System (INIS)

    Electrostatic storage rings have proven to be invaluable tools for atomic and molecular physics at the ultra-low energy range from 1 to 100 keV/A. Due to the mass independence of the electrostatic rigidity these machines are able to store a wide range of different particles, from light ions to heavy singly charged bio-molecules. Their beam dynamics is, however, fundamentally different to magnetic storage rings and therefore needs to be investigated in detail to optimize storage ring performance and experimental output. This paper first gives an overview of existing electrostatic storage rings and their experimental programs. Second, future machines in Heidelberg, Stockholm and the Facility for Antiproton and Ion Research (FAIR) are described and the main challenges are summarized. Finally, the focus is set on a flexible storage ring facility presently being built up at the King Abdulaziz Center for Science and Technology (KACST) in Riyadh, Saudi Arabia, that addresses a broad user community and will allow for a next-generation experimental program in the low energy regime.

  6. The physics interests of a 10 TeV proton synchrotron, 400 x 400 GeV2 proton storage rings, and electron-proton storage rings

    International Nuclear Information System (INIS)

    This report consists of a collection of documents produced by two Study Groups, one on a multi-TeV Proton Synchrotron and the other on 400 x 400 GeV2 Proton Storage Rings. In both studies the reactions of interest in the weak, electromagnetic and strong interactions are discussed. The technical feasibility of the relevant experiments is investigated by attempting. in each case, the design of an experimental set-up. Event rates are estimated using currently p revailing theoretical models and by extrapolation of results at present accelerators. In addition to the work of the two Study Groups, a section on the physics interests and technical problems of ep Storage Rings is included. (author)

  7. Magnetically induced pumping and memory storage in quantum rings

    Science.gov (United States)

    Cini, Michele; Perfetto, Enrico

    2011-12-01

    Nanoscopic rings pierced by external magnetic fields and asymmetrically connected to wires behave in sharp contrast with classical expectations. By studying the real-time evolution of tight-binding models in different geometries, we show that the creation of a magnetic dipole by a bias-induced current is a process that can be reversed: connected rings excited by an internal ac flux produce ballistic currents in the external wires. In particular we point out that by employing suitable flux protocols, single-parameter nonadiabatic pumping can be achieved, and an arbitrary amount of charge can be transferred from one side to the other. We also propose a setup that could serve a memory device, in which both the operations of writing and erasing can be efficiently performed.

  8. Electron cloud development in the Proton Storage Ring and in the Spallation Neutron Source

    International Nuclear Information System (INIS)

    We have applied our simulation code ''POSINST'' to evaluate the contribution to the growth rate of the electron-cloud instability in proton storage rings. Recent simulation results for the main features of the electron cloud in the storage ring of the Spallation Neutron Source(SNS) at Oak Ridge, and updated results for the Proton Storage Ring (PSR) at Los Alamos are presented in this paper. A key ingredient in our model is a detailed description of the secondary emitted-electron energy spectrum. A refined model for the secondary emission process including the so-called true secondary, rediffused and backscattered electrons has recently been included in the electron-cloud code

  9. BPM System and its Development for the Storage Ring of NSRRC

    CERN Document Server

    Hsu, K T; Hu, K H; Kuo, C H; Lee, D; Wang, C J; Yang, Y T

    2005-01-01

    There are about sixty BPMs installed around the storage ring of NSSRC. High precision closed orbit are measured by Bergoz’s MX-BPMs. Data acquisition is done by multi-channels 16 bits ADC modules. The orbit data is sampled every millisecond. The fast orbit data are shared by reflective memory network to support fast orbit feedback. Averaged data in are update to control system database in 10 Hz rate. Turn-by-turn orbit was measured by several Bergoz’s log-ratio BPMs and was recorded by transient digitizer to support various beam physics study. Digital BPM have been installed at the storage ring to enhance functionality of the BPM system at the storage ring to support routine operation and various beam physics study. Preliminary test of Instrumentation Technologies’ Libera is on going. The system structure, software environment and performance of BPM system will be summary in this report.

  10. Intense X-ray sources based on compton scattering in laser electron storage rings

    International Nuclear Information System (INIS)

    The main problem of the designing of intense X-ray sources based on Compton scattering in laser-electron storage ring is associated with large steady-state electron beam energy spread. In paper the principles of the development of compact storage ring lattice with large RF-acceptance and negligible chromatic effects at interaction point are considered. The storage ring with electron beam energy over the range 100-400 MeV that allows generating intense VUV from bending magnets, X-ray up to 280 keV with rate up to 1014 photons/s and γ-beam up to 2.8 MeV for neutron generation on beryllium target is proposed

  11. Electrodynamic cooling of an ion beam in a ring storage with a transparent target

    International Nuclear Information System (INIS)

    Operation principles of ion ring storage equipped with internal permeable target and energy loss compensation by high-frequency field, are studied. Beam circulation conditions in a storage ring are studied, effects of electrodynamic damping of ion oscillations in circulating clusters caused by energy losses in isotropic target and by dependence of the efficient accelerating voltage on ion rate are forecasted and analyzed. It is shown, that damping may compensate for destabilizing effect of elastic and inelastic scattering on the target atoms. Numerical simulation of 1.75 MeV energy proton beam dynamics in a storage ring with permeable carbon target is carried out. It is determined that ion undergo several hundreds of rotations under stable circulation mode. 5 refs.; 2 figs

  12. Beam lifetime calculation in an electron storage ring for synchrotron radiation

    International Nuclear Information System (INIS)

    In an electron storage ring dedicated for synchrotron radiation, the beam lifetime should be of a few hours, so that the radiation is available to the users for sufficient time. The beam lifetime in an electron storage ring is the average of the finite lifetimes arising due to betatron and energy oscillations, Coulomb scattering and elastic and inelastic scattering of electrons due to residual gases present in the beam tube. A computer program has been written to study the variation of beam lifetime with various machine parameters such as lattice functions, rf voltage, tube aperture etc. The program has been developed to take input data from AGS computer program output. The lifetime of electron beam at lower energies has been studied for a weak focussing electron storage ring and is found to be governed mainly by Coulomb scattering. (author). 3 figs

  13. Beam emittance growth in a proton storage ring employing charge exchange injection

    International Nuclear Information System (INIS)

    Recently, it has been shown that very large currents can be accumulated in medium energy proton storage rings by multiturn injection of an H- beam through a charge stripping medium. Since the particles are injected continuously into the same phase space, it is possible to increase the circulating beam brightness with respect to that of the incoming beam by a large factor. The stored protons pass repeatedly through the stripper, however, so that this phase space is gradually enlarged by scattering. The dependence of the circulating beam phase space (emittance) growth rate on the nature of the scattering process and on where it occurs in the storage ring matrix is considered. Since the motivation for this work arose in connection with the design of the proposed high-current storage ring at LAMPF, the results are focused on the specific parameters of that device. (U.S.)

  14. Circuit description of unipolar DC-to-DC converters for APS storage ring quadrupoles and sextupoles

    International Nuclear Information System (INIS)

    This paper describes the control, interlock, and power circuits for 680 unipolar switch mode DC-to-DC converters used to regulate the Advanced Photon Sources (APS's) storage ring quadrupole and sextupole magnet currents. Quadrupole current stability is ± 6x10-5 and the sextupole current stability is ±3x10-4. The stability is obtained with pulse width modulation, operating at a switching frequency of 20kHz with full current switching. The converters are housed in 200 cabinets located on top of the storage ring tunnel. Raw DC power is distributed from 80 AC-to-DC power supplies, four at each of 20 locations around the storage ring. Voltages, currents, and temperatures are computer monitored and logged for the converters and magnets. All converters and magnets are water cooled with the flow and pressure monitored at the inlet and outlet of groups. Water is interlocked with the raw power supplies and not the individual converters

  15. How well do we know the circumference of a storage ring?

    Energy Technology Data Exchange (ETDEWEB)

    Beckmann, M. [DESY (Germany); Ziemann, V., E-mail: volker.ziemann@physics.uu.se [Uppsala University (Sweden)

    2015-01-21

    High-precision nuclear physics experiments in storage rings require precise knowledge of the beam energy. In the absence of electron cooling, which provides this information, one can use the frequency of the radio-frequency system in conjunction with knowledge of the circumference of the ring. We investigate to which precision the latter can be determined in the presence of magnet misalignment and orbit correction.

  16. How well do we know the circumference of a storage ring?

    Science.gov (United States)

    Beckmann, M.; Ziemann, V.

    2015-01-01

    High-precision nuclear physics experiments in storage rings require precise knowledge of the beam energy. In the absence of electron cooling, which provides this information, one can use the frequency of the radio-frequency system in conjunction with knowledge of the circumference of the ring. We investigate to which precision the latter can be determined in the presence of magnet misalignment and orbit correction.

  17. Dynamical states of a system due to localized wake forces in a BEPC storage ring

    CERN Document Server

    Nam, S K; Zhang, C; Kim, E S

    1999-01-01

    We examine the dynamical states of a system in the storage ring of the Beijing electron-positron collider (BEPC) by using an extended model with the combination of a constant wake and a delta wake function. The influences of parameters on the stable equilibrium states and the transitions of the states in the BEPC ring are also investigated by using a new extended model with a constant wake function and a delta wake function.

  18. Resonance Method of Electric-Dipole-Moment Measurements in Storage Rings

    International Nuclear Information System (INIS)

    A 'resonance method' of measuring the electric dipole moment (EDM) of nuclei in storage rings is described, based on two new ideas: (1) Oscillating particles' velocities in resonance with spin precession, and (2) alternately producing two sub-beams with different betatron tunes--one sub-beam to amplify and thus make it easier to correct ring imperfections that produce false signals imitating EDM signals, and the other to make the EDM measurement

  19. RESONANCE METHOD OF ELECTRIC-DIPOLE-MOMENT MEASUREMENTS IN STORAGE RINGS.

    Energy Technology Data Exchange (ETDEWEB)

    ORLOV, Y.F.; MORSE, W.M.; SEMERTZIDIS, Y.K.

    2006-05-10

    A ''resonance method'' of measuring the electric dipole moment (EDM) of nuclei in storage rings is described, based on two new ideas: (1) Oscillating particles velocities in resonance with spin precession, and (2) alternately producing two sub-beams with different betatron tunes--one sub-beam to amplify and thus make it easier to correct ring imperfections that produce false signals imitating EDM signals, and the other to make the EDM measurement.

  20. How well do we know the circumference of a storage ring?

    International Nuclear Information System (INIS)

    High-precision nuclear physics experiments in storage rings require precise knowledge of the beam energy. In the absence of electron cooling, which provides this information, one can use the frequency of the radio-frequency system in conjunction with knowledge of the circumference of the ring. We investigate to which precision the latter can be determined in the presence of magnet misalignment and orbit correction

  1. Steady State Microbunching for High Brilliance and High Repetition Rate Storage Ring-Based Light Sources

    International Nuclear Information System (INIS)

    Electron-based light sources have proven to be effective sources of high brilliance, high frequency radiation. Such sources are typically either linac-Free Electron Laser (FEL) or storage ring types. The linac-FEL type has high brilliance (because the beam is microbunched) but low repetition rate. The storage ring type has high repetition rate (rapid beam circulation) but comparatively low brilliance or coherence. We propose to explore the feasibility of a microbunched beam in a storage ring that promises high repetition rate and high brilliance. The steady-state-micro-bunch (SSMB) beam in storage ring could provide CW sources for THz, EUV, or soft X-rays. Several SSMB mechanisms have been suggested recently, and in this report, we review a number of these SSMB concepts as promising directions for high brilliance, high repetition rate light sources of the future. The trick of SSMB lies in the RF system, together with the associated synchrotron beam dynamics, of the storage ring. Considering various different RF arrangements, there could be considered a number of scenarios of the SSMB. In this report, we arrange these scenarios more or less in order of the envisioned degree of technical challenge to the RF system, and not in the chronological order of their original references. Once the stored beam is steady-state microbunched in a storage ring, it passes through a radiator repeatedly every turn (or few turns). The radiator extracts a small fraction of the beam energy as coherent radiation with a wavelength corresponding to the microbunched period of the beam. In contrast to an FEL, this radiator is not needed to generate the microbunching (as required e.g. by SASE FELs or seeded FELs), so the radiator can be comparatively simple and short.

  2. Dielectronic recombination experiments with tungsten ions at the test storage ring and development of a single-particle detector at the cryogenic storage ring

    International Nuclear Information System (INIS)

    This work is about electron-ion collision experiments at the ion storage rings of the Max Planck Institute for Nuclear Physics in Heidelberg. Absolute recombination rate coefficients of highly-charged tungsten ions featuring an open 4-f-shell structure have been measured at the heavy-ion storage ring TSR. The resulting plasma rate coefficients have been used to probe the significance of newly developed theoretical approaches. Plasma rate coefficients of highly-charged tungsten ions are in particular interesting for the development of plasma models for nuclear fusion reactors, since tungsten is a foreseeable impurity in the fusion plasma. In the relevant temperature range, the experimental results exceed the theoretical data used so far by up to a factor of 10, showing the need for more reliable theoretical calculations. Furthermore, based on the design of the detectors which have been used in the experiments at TSR, a movable single-particle detector for electron-ion recombination studies at the cryogenic storage ring CSR has been developed and installed within the scope of this work. The device has been designed specifically to meet the requirements of the CSR regarding low ion energies and cryogenic ambient temperature conditions. In a series of experiments, the detector was carefully characterised and successfully tested for its compatibility with these requirements. The detector was part of the infrastructure used for the room-temperature commissioning of CSR (2014) and is currently operated as a single-particle counter during the first cryogenic operation of CSR in 2015.

  3. Dielectronic recombination experiments with tungsten ions at the test storage ring and development of a single-particle detector at the cryogenic storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Spruck, Kaija

    2015-05-15

    This work is about electron-ion collision experiments at the ion storage rings of the Max Planck Institute for Nuclear Physics in Heidelberg. Absolute recombination rate coefficients of highly-charged tungsten ions featuring an open 4-f-shell structure have been measured at the heavy-ion storage ring TSR. The resulting plasma rate coefficients have been used to probe the significance of newly developed theoretical approaches. Plasma rate coefficients of highly-charged tungsten ions are in particular interesting for the development of plasma models for nuclear fusion reactors, since tungsten is a foreseeable impurity in the fusion plasma. In the relevant temperature range, the experimental results exceed the theoretical data used so far by up to a factor of 10, showing the need for more reliable theoretical calculations. Furthermore, based on the design of the detectors which have been used in the experiments at TSR, a movable single-particle detector for electron-ion recombination studies at the cryogenic storage ring CSR has been developed and installed within the scope of this work. The device has been designed specifically to meet the requirements of the CSR regarding low ion energies and cryogenic ambient temperature conditions. In a series of experiments, the detector was carefully characterised and successfully tested for its compatibility with these requirements. The detector was part of the infrastructure used for the room-temperature commissioning of CSR (2014) and is currently operated as a single-particle counter during the first cryogenic operation of CSR in 2015.

  4. Isochronous storage rings and high-luminosity electron-positron colliders

    International Nuclear Information System (INIS)

    The interest in studying CP and possibly CPT violations in B- and φ-meson decay has led recently to several proposals for the construction of B- and φ-factories, with luminosity in the range of 1033 cm-2s-1 to 1034 cm-2s-1. With a conventional storage-ring collider, this high luminosity, 10 to 100 times larger than the maximum obtained up to now, is obtained by increasing the stored electron and positron beam currents from the 100-100 mA range to the several-ampere level. This very large beam current raises questions of collective instabilities, and vacuum and RF system design. In addition, the RF power needed to compensate the synchrotron radiation losses is of the order of 5 to 10 MW. In this paper, the authors propose to use an isochronous storage ring, having the particle revolution frequency independent of energy, to achieve a high luminosity with a small beam current. Isochronous rings have been discussed before as possible damping rings for linear colliders and for free electron lasers, and some of their properties have already been discussed. In this paper, the authors make a more detailed study of the beam dynamics in such a ring. The advantage of an isochronous ring are the possibility of reducing the bunch length from the present centimeter range to the millimeter range; the elimination of one class of resonances, the synchrobetatron resonances, limiting the beam density at the collision point and the interaction region geometry. The authors discuss the basic concept and some of the main properties of an isochronous ring. This discussion will define the conditions for a stable operation of an isochronous ring. The authors then consider the possibility of using an isochronous ring as a collider, along with its advantages and disadvantages. As an example, the authors will then give the main parameters of a B-factory based on this idea

  5. Commissioning of the DESIREE storage rings – a new facility for cold ion-ion collisions

    International Nuclear Information System (INIS)

    We report on the ongoing commissioning of the Double ElectroStatic Ion Ring ExpEriment, DESIREE, at Stockholm University. Beams of atomic carbon anions (C−) and smaller carbon anion molecules (C−2, C−3, C−4 etc.) have been produced in a sputter ion source, accelerated to 10 keV or 20 keV, and stored successfully in the two electrostatic rings. The rings are enclosed in a common vacuum chamber cooled to below 13 Kelvin. The DESIREE facility allows for studies of internally relaxed single isolated atomic, molecular and cluster ions and for collision experiments between cat- and anions down to very low center-of-mass collision energies (meV scale). The total thermal load of the vacuum chamber at this temperature is measured to be 32 W. The decay rates of stored ion beams have two components: a non-exponential component caused by the space charge of the beam itself which dominates at early times and an exponential term from the neutralization of the beam in collisions with residual gas at later times. The residual gas limited storage lifetime of carbon anions in the symmetric ring is over seven minutes while the 1/e lifetime in the asymmetric ring is measured to be about 30 seconds. Although we aim to improve the storage in the second ring, the number of stored ions are now sufficient for many merged beams experiments with positive and negative ions requiring milliseconds to seconds ion storage

  6. Feasibility Study of Compact Gas-Filled Storage Ring for 6D Cooling of Muon Beams

    International Nuclear Information System (INIS)

    The future of elementary particle physics in the USA depends in part on the development of new machines such as the International Linear Collider, Muon Collider and Neutrino Factories which can produce particle beams of higher energy, intensity, or particle type than now exists. These beams will enable the continued exploration of the world of elementary particles and interactions. In addition, the associated development of new technologies and machines such as a Muon Ring Cooler is essential. This project was to undertake a feasibility study of a compact gas-filled storage ring for 6D cooling of muon beams. The ultimate goal, in Phase III, was to build, test, and operate a demonstration storage ring. The preferred lattice for the storage ring was determined and dynamic simulations of particles through the lattice were performed. A conceptual design and drawing of the magnets were made and a study of the RF cavity and possible injection/ejection scheme made. Commercial applications for the device were investigated and the writing of the Phase II proposal completed. The research findings conclude that a compact gas-filled storage ring for 6D cooling of muon beams is possible with further research and development

  7. Design and development of a bipolar power supply for APS storage ring correctors

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) requires a number of correction magnets. Basically, two different types of bipolar power supplies (BPS) will be used for all the correction magnets. One requires dc correction only, and the other requires dc and ac correction. For the storage ring horizontal/vertical (H/V) correctors, the BPS should be able to supply dc and ac current. This paper describes the design aspects and considerations for a bipolar power supply for the APS storage ring H/V correctors

  8. Electro-optical bunch length measurements at the ANKA storage ring - First lessons learned

    Energy Technology Data Exchange (ETDEWEB)

    Hiller, Nicole; Borysenko, Andrii; Hertle, Edmund; Huttel, Erhard; Judin, Vitali; Marsching, Sebastian; Mueller, Anke-Susanne; Nasse, Michael J.; Schuh, Marcel [Karlsruher Institut fuer Technologie (KIT), Karlsruhe (Germany)

    2013-07-01

    A set up for near-field electro optical bunch length measurements has recently been installed into the UHV system of the ANKA storage ring. For electro-optical bunch length measurements during ANKA's low alpha operation a laser pulse is used to probe the field induced birefringence in an electro-optical crystal (GaP in our case). The setup allows for both, electro-optical sampling (EOS, multi-shot) and spectral decoding (EOSD, single- and multi-shot) measurements. This talk presents first results and discusses challenges that needed to be overcome in order for this method to work at storage rings.

  9. Beam loading effects during injection processes in an electron storage ring

    International Nuclear Information System (INIS)

    When the current in an electron storage ring increases through the injection process, the RF properties such as the accelerating field, cavity tuning and reflecting power undergo some changes. They must be cancelled out by tuning the RF system in order to get a stable operation. In this report these changes are given in the first order approximation. For the RF storage ring an increment of the current of 25 mA in one injection process brings about no serious effect and a stored current of 500 mA would be obtained in less than 10 minutes. (auth.)

  10. Design for ANL 7 GeV storage ring vacuum system

    International Nuclear Information System (INIS)

    The 7-GeV Advanced Photon Source (APS) design includes a storage ring having a 1060-m circumference with the capability of accommodating 34 insertion devices (ID) and their associated photon beam lines. An additional 35 photon lines can be provided from bending magnets. The vacuum system for the storage ring is designed to maintain a beam-on operating pressure of 1n Torr or less to achieve a positron beam lifetime of approximately 20 hours. The vacuum system and it's current developmental status are described

  11. A Genetic Algorithm for Chromaticity Correction in Diffraction Limited Storage Rings

    CERN Document Server

    Ehrlichman, Michael

    2016-01-01

    An multi-objective genetic algorithm is developed for optimizing nonlinearities in diffraction limited storage rings. This algorithm determines sextupole and octupole strengths for chromaticity correction that deliver optimized dynamic aperture and beam lifetime. The algorithm makes use of dominance constraints to breed desirable properties into the early generations. The momentum aperture is optimized indirectly by constraining the chromatic tune footprint and optimizing the off-energy dynamic aperture. The result is an effective and computationally efficient technique for correcting chromaticity in a storage ring while maintaining optimal dynamic aperture and beam lifetime. This framework was developed for the Swiss Light Source (SLS) upgrade project.

  12. Undulator physics and coherent harmonic generation at the MAX-lab electron storage ring

    International Nuclear Information System (INIS)

    This work presents the undulator and harmonic generation project at the electron storage ring MAX-lab at University of Lund. The theory of undulator radiation, laser coherent harmonic generation, optical klystron amplifiers and FELs is treated in one uniform way, with complete solutions of the necessary equations. The permanent magnet undulator is described in some detail, along with the installation of the undulator in the storage ring. Details regarding the emitted radiation, the electron beam path in the undulator and other results are analysed. Finally harmonic generation using a Nd:YAG laser and the creation of coherent photons at the third harmonic (355 nm) is described. (author)

  13. Electron–ion merged-beam experiments at heavy-ion storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Schippers, Stefan, E-mail: Stefan.Schippers@physik.uni-giessen.de

    2015-05-01

    In the past two decades, the electron–ion merged-beams technique has extensively been exploited at heavy-ion storage rings equipped with electron coolers for spectroscopic studies of highly charged ions as well as for measuring absolute cross sections and rate coefficients for electron–ion recombination and electron-impact ionization of multiply charged atoms ions. Some recent results are highlighted and future perspectives are pointed out, in particular, in view of novel experimental possibilities at the FAIR facility in Darmstadt and at the Cryogenic Storage Ring at the Max-Planck-Institute for Nuclear Physics in Heidelberg.

  14. Optics for the lattice of the compact storage ring for a Compton X-ray source

    Institute of Scientific and Technical Information of China (English)

    YU Pei-Cheng; WANG Yu; SHEN Xiao-zhe; HUANG Wen-Hui; YAN Li-xin; DU Ying-Chao; LI Ren-Kai; TANG Chuan-Xiang

    2009-01-01

    We present two types of optics for the lattice of a compact storage ring for a Compton X-ray source.The optics design for different operation modes of the storage ring are discussed in detail.For the pulse mode optics,an IBS-suppression scheme is applied to optimize the optics for lower IBS emittance growth rate;as for the steady mode,the method to control momentum compact factor is adopted[Gladkikh P,Phys.Rev.ST Accel.Beams 8,050702]to obtain stability of the electron beam.

  15. Some notes on beam dynamics due to vertical oscillations in an all-electric storage ring

    CERN Document Server

    Mane, S R

    2015-01-01

    A document has recently been posted on the arXiv [1], describing analytical formulas and results of particle tracking simulations, for precision tests of numerical integration algorithms for an EDM (electric dipole moment) storage ring. In the context of an all-electric storage ring, the authors cite theoretical formulas by Orlov [2]. However, the reference to Orlov is to a talk at a workshop in 2012, and is unpublished and difficult for independent researchers to access and validate. This note rederives and generalizes some of Orlov's principal results, using a Hamiltonian formalism, and also corrects some details in both Orlov's note [2] and the arXiv post [1].

  16. DEVELOPMENT OF A HYDROGEN AND DEUTERIUM POLARIZED GAS TARGET FOR APPLICATION IN STORAGE RINGS

    Energy Technology Data Exchange (ETDEWEB)

    Willy Haeberli

    2009-06-18

    The exploration of spin degrees of freedom in nuclear and high-energy interactions requires the use of spin-polarized projectiles and/or spin-polarized targets. During the last two decades, the use of external beams from cyclotrons has to a large extent been supplanted by use of circulating beams stored in storage rings. In these experiments, the circulating particles pass millions of times through targets internal to the ring. Thus the targets need to be very thin to avoid beam loss by scattering out of the acceptance aperture of the ring.

  17. The heavy ion cooler-storage-ring project (HIRFL-CSR) at Lanzhou

    International Nuclear Information System (INIS)

    HIRFL-CSR, a new ion Cooler-Storage-Ring (CSR) project, is the post-acceleration system of the Heavy Ion Research Facility in Lanzhou (HIRFL). It consists of a main ring (CSRm) and an experimental ring (CSRe). From the HIRFL cyclotron system the heavy ions will be accumulated, cooled and accelerated in the CSRm, then extracted fast to produce radioactive ion beams (RIB) or highly charged heavy ions. Those secondary beams will be accepted and stored by the CSRe for many internal-target experiments with electron cooling

  18. Longitudinally polarized electrons in a storage ring below 1 GeV

    International Nuclear Information System (INIS)

    We report on the results of studies of the longitudinal electron polarization in the AmPS storage ring at NIKHEF. The ring was operated using a partial Siberian snake at the first magic energy, and a full Siberian snake between 440 MeV and 720 MeV. We have investigated the effect of high beam currents in the ring, and found that some of the electron polarization is lost if the beam current becomes larger than ≅120 mA

  19. Longitudinally Polarized Electrons in a Storage Ring below 1 GeV

    International Nuclear Information System (INIS)

    The results of studies of the longitudinal electron polarization in the AmPS storage ring at NIKHEF are reported. The ring was operated using a partial Siberian snake at the first magic energy, and a full Siberian snake between 440 MeV and 720 MeV. The effect of high beam currents in the ring was investigated, and it was found that some of the electron polarization is lost if the beam current becomes larger than ∼120 mA

  20. Los Alamos Proton Storage Ring (PSR) injection deflector system

    International Nuclear Information System (INIS)

    We describe a pulsed magnetic deflector system planned for the injection system of the PSR. Two sets of magnets, appropriately placed in the optical systems of both the ring and the injection transport line, provide control of the rate at which particles are injected into a given portion of transverse phase space and limit the interaction of stored beam with the injection stripping foil. High-current modulators that produce relatively complex waveforms are required for this purpose. Solid-state drivers using direct feedback to produce the necessary waveforms are discussed as replacements for the more conventional high-voltage tube technology

  1. Numerical study of thin layer ring on improving the ice formation of building thermal storage system

    International Nuclear Information System (INIS)

    Ice thermal storage systems have been widely used in HVAC and R systems for improving energy efficiency and reducing energy costs around the world. In this paper, a numerical model is developed to simulate the ice formation in a typical ice thermal storage system. The first study is to investigate the effect of a cooled cylinder placed in a rectangular space filled with water on the ice formation process. The validated numerical model can predict temperature distribution associated with liquid fraction during the process. Based on the result obtained from the first study, further research is focused on the novel structure of thin layer ring. The computational solutions can demonstrate that the thin layer ring structure can successfully increase an ice generated area and shorten the ice formation period in a typical ice thermal storage system. Finally, a parametric study was carried out to investigate the effect of material, thickness, and arrangement of thin layer ring. It predicted that the heat transfer performance of the thin layer ring is dependent on its material, thickness, and arrangement. Ice formation with novel thin layer ring can be improved by increasing the thermal conductivity of a material. A copper ring has the best performance among aluminum, stainless steel, magnesium alloy. The results show that the ice formation rate can be increased by increasing the thickness of the ring from 0.25 mm to 1 mm, while slowed by increasing from 1 mm to 2 mm and has the best performance with 3 mm ring in this study. Finally, the staggered arrangement of ring shows the best results of the ice formation compared to one parallel and two parallel cases. - Highlights: •A thin layer ring structure is studied systematically to enhance ice formation. •Increasing thermal conductivity of thin layer ring can increase ice formation rate. •Ice formation rate is also dependent on the thickness of thin layer ring. •Increasing thin layer ring area can increase ice

  2. Optimising environmental steps for the ASTRID project

    International Nuclear Information System (INIS)

    Often felt as a stress in the 90s, projects can no longer ignore the ISO environmental directives governing design. As the 4th generation reactor project, the ASTRID team has decided to go further in its approach by taking full responsibility to optimise the environmental steps within a sustainable development strategy which systematically looks to minimise the environmental impact of the project per kilowatt-hour of electricity generated. This also illustrates the importance of public acceptance, by considering the environmental requirements as a positive way of ensuring a responsible performance label. The paper describes a series of practical measures taken by the CEA as the project owner (identification of environmental requirements in the structuring documents, ecological inventory of the prospective site’s biotope, impact assessment, etc.) and by their engineering partners in their pre-conceptual studies. For example, natural resources will be optimised and minor actinides will be incinerated (radioactive waste) in the core; design options will be compared on the basis of environmental criteria for the nuclear island; and in terms of non-nuclear installations, a High Environmental Quality approach will be used to design the building housing the turbine. This paper describes the expected status of the nuclear island at the end of the pre-conceptual design phase; some reservations do remain in this paper since certain pre-conceptual design decisions will only be confirmed at the end of 2012. (author)

  3. Design and optimization of a longitudinal feedback kicker cavity for the HLS-II storage ring

    Science.gov (United States)

    Xu, Wei; Z. Wu, W.; He, Duo-Hui; K. Wu, Y.

    2013-03-01

    In the Hefei Light Source (HLS) storage ring, multibunch operation is used to obtain a high luminosity. Multibunch instabilities can severely limit light source performance with a variety of negative impacts, including beam loss, low injection efficiency, and overall degradation of the beam quality. Instabilities of a multibunch beam can be mitigated using certain techniques including increasing natural damping (operating at a higher energy), lowering the beam current, and increasing Landau damping. However, these methods are not adequate to stabilize a multibunch electron beam at a low energy and with a high current. In order to combat beam instabilities in the HLS storage ring, active feedback systems including a longitudinal feedback system (LFB) and a transverse feedback system (TFB) will be developed as part of the HLS upgrade project, the HLS- II storage ring project. As a key component of the longitudinal bunch-by-bunch feedback system, an LFB kicker cavity with a wide bandwidth and high shunt impedance is required. In this paper we report our work on the design of the LFB kicker cavity for the HLS- II storage ring and present the new tuning and optimization techniques developed in designing this high performance LFB kicker.

  4. A beauty factory using an SRF linac and a storage ring

    International Nuclear Information System (INIS)

    We present a brief review of accelerator facilities proposed for measuring CP violation in the B-meson system. In light of this comparison we discuss requirements for a B-factory using an e+ storage ring beam colliding with a superconducting RF linac e- beam to produce a luminosity of 1034 cm-2sec-1. 14 refs., 3 tabs

  5. Efficiency of the focusing channel of the Belok Station in the Sibir-2 storage ring

    International Nuclear Information System (INIS)

    The efficiency of the focusing systems of the Belok station on the synchrotron radiation beam from the bending magnet in the Sibir-2 storage ring has been experimentally determined using the IK-12 and IK-30 miniature ionization chambers developed at the Shubnikov Institute of Crystallography and calibrated with an FDUK-100UV photodiode developed at the Ioffe Physical Technical Institute.

  6. Compton backscattering of intracavity storage ring free-electron laser radiation

    International Nuclear Information System (INIS)

    We discuss the γ- ray production by Compton backscattering of intracavity S.R. FEL radiation. We use a semi-analytical model which provides the build up of the signal combined with the storage ring damping mechanism and derive simple relations yielding the connection between backscattered photons brightness and the intercavity laser equilibrium intensity

  7. Measurements of bunch length and shape at the ANKA storage ring

    International Nuclear Information System (INIS)

    Various methods are in use at the ANKA storage ring to determine the length and, if possible, the shape of the electron bunches. This presentation gives an overview of the different methods and studies performed. Emphasis will be put on streak camera measurements and the technique of intensity autocorrelation with semi-conductor detectors.

  8. Measurements of bunch length and shape at the ANKA storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Hiller, Nicole; Fitterer, Miriam; Hillenbrand, Steffen; Huttel, Erhard; Hofmann, Andre; Judin, Vitali; Klein, Marit; Marsching, Sebastian; Mueller, Anke-Susanne; Plech, Anton; Smale, Nigel; Sonnad, Kiran [Karlsruhe Institute of Technology, Karlsruhe (Germany); Bruendermann, Erik; Krueger, Matthias [Physikalische Chemie II, Ruhr University, Bochum (Germany); Tavares Fernandes, Pedro [Karlsruhe Institute of Technology, Karlsruhe (Germany); Brazilian Synchrotron Light Laboratory (LNLS) (Brazil)

    2010-07-01

    Various methods are in use at the ANKA storage ring to determine the length and, if possible, the shape of the electron bunches. This presentation gives an overview of the different methods and studies performed. Emphasis will be put on streak camera measurements and the technique of intensity autocorrelation with semi-conductor detectors.

  9. Storage ring lattice considerations of short wavelengths single pass free electron lasers

    International Nuclear Information System (INIS)

    To generate radiation at short wavelengths, λ < 500 A, using a free electron laser there are some stringent requirements on the electron beam. In this article the authors shall discuss these requirements and the consequences for the design of an electron storage ring to produce the required electron beam

  10. Orbital and spin motion in a storage ring with static electric and magnetic fields

    Science.gov (United States)

    Mane, S. R.

    2012-09-01

    I present the fundamental electrodynamic equations of motion for the orbital and spin motion in a storage ring with static electric and magnetic fields, including motion in pure electrostatic fields. In particular, I treat strong focusing lattices and synchrotron oscillations. This generalizes and extends the work of previous authors. I also treat the spin motion, including a possible permanent electric dipole moment (EDM).

  11. Feasibility of search for nuclear electric dipole moments at ion storage rings

    OpenAIRE

    Khriplovich, I. B.

    1998-01-01

    The sensitivity much better than $10^{-24} e$ cm may be expected in the searches for electric dipole moments (EDM) of $\\beta$-active nuclei at ion storage rings. It would be a serious progress in studies of the CP-violation problem.

  12. Chromatin compensation and dynamic aperture of the Sibir'-2 electron storage ring (numerical simulation)

    International Nuclear Information System (INIS)

    Effect of regular qudratic nonlinear fields (sextupole lenses) intended for compensation of linear chromatism nonlinear errors of magnet fields and quadrupole lenses with an account of particle nonequilibrium pulse on the particle dynamics in the Sibir' storage ring was stided by numerical simulation method. 16 refs

  13. Modern Ives-Stilwell Experiments At Storage Rings: Large Boosts Meet High Precision

    CERN Document Server

    Gwinner, G; Geppert, C; Huber, G; Karpuk, S; Krieger, A; Nörtershäuser, W; Novotny, C; Kühl, T; Sanchez, R; Stöhlker, T; Bing, D; Schwalm, D; Wolf, A; Hänsch, T W; Reinhardt, S; Saathoff, G

    2013-01-01

    We give a brief overview of time dilation tests using high-resolution laser spectroscopy at heavy-ion storage rings. We reflect on the various methods used to eliminate the first-order Doppler effect and on the pitfalls encountered, and comment on possible extensions at future facilities providing relativistic heavy ion beams at $\\gamma \\gg 1$.

  14. The superconducting inflector dipole for the muon g-2 storage ring

    International Nuclear Information System (INIS)

    A muon g-2 storage ring at Brookhaven National Laboratory will have a DC superconducting inflector magnet for injection of the muon beam. This inflector locally bucks out the 1.45 tesla storage ring dipole field, so that the muon beam enters the ring tangentially as close as possible to the equilibrium orbit. The g-2 experiment requires the knowledge of the magnetic field over the muon orbits to a precision of 0.1 ppm. The inflector has nested dipole coils of opposite polarity so that it cancels its external magnetic flux and generates very little stray field. Nevertheless the residual field would effect the homogeneity of the storage ring magnetic field. A method of using a multilayer SC composite sheet surrounding the inflector to further reduce the fringe field has been proposed. This sheet should prevent the stray field due to the inflector from affecting the field quality of the muon storage region. In developing this new type of air-core septum magnet, a shortened SC prototype inflector was built in Japan at KEK. It has been used for testing the superconducting performance (in KEK, BNL) and the fringe flux shielding (in BNL). Some of the test results are presented

  15. Thousand TeV in the center of mass: introduction to high-energy storage rings

    International Nuclear Information System (INIS)

    The lecture discusses, in a pedagogic way, a hypothetical 500 TeV proton storage ring accelerator. It gives machine parameters, discusses linear optics and betatron motions, surveys questions of errors, tolerances and nonlinear resonances, and discusses some of the demands on the detection apparatus, especially the apparent inevitability of multiple interactions per bunch crossing

  16. Storage ring free electron laser. Operation with two undulators having opposite circular polarizations

    International Nuclear Information System (INIS)

    In Storage Ring Free Electron Lasers two undulators, having opposite helical polarizations and arranged as an Optical-Klystron, may be exploited to obtain linearly polarized radiation, without additional problems associated with mirror degradation, due to the higher on axis harmonic emission. In this paper it was explored the dynamical behavior of this device and discuss possible configurations allowing such as possibility

  17. Schottky diagnosis and BTF measurements on cooled beams in the heavy ion storage ring ESR

    International Nuclear Information System (INIS)

    This report describes a non-destructive diagnosis system installed at the ESR (Experimental Storage Ring). Using this system a variety of beam and machine parameters can be evaluated. It turned out to be a very important diagnostic tool during all beam-times of the ESR. (orig./HSI)

  18. A precision luminosity monitor for use at electron - positron storage rings

    International Nuclear Information System (INIS)

    A precision luminosity monitor is described which has been used successfully in an experimental test of quantum electrodynamics at the 2.6GeV electron-positron storage ring(SPEAR-I)at the Stanford Linear Accelerator Center. Design considerations and construction details are given, together with a discussion of radiative corrections and an evaluation of the response of the monitor. (Auth.)

  19. Solutions of Fokker-Planck-type equations and dynamical behaviour of electron beam in storage rings

    International Nuclear Information System (INIS)

    The authors use algebraic ordering methods to solve a general class of Fokker-Planck-type equations. It is obtain analytical result yielding a straightforward and transparent understanding of physical processes governed by Fokker-Planck equations. The method is finally applied to the analysis of the evolution of the longitudinal phase space of an e-beam circulating in a Storage Ring

  20. The commissioning progress of the cooler storage ring HIRFL-CSR in Lanzhou

    International Nuclear Information System (INIS)

    HIRFL-CSR is a multi-purpose cooler-storage-ring system constructed at the Institute of Modern Physics, Chinese Academy of Sciences in Lanzhou, China. Construction of the HIRFL-CSR storage ring complex has been finished, and passed the government check and acceptance, recently. The first stored beam in the CSRm was obtained in January 2006 using stripping injection. The commissioning got great progress in 2007. In early January 2007 electron cooling in CSRm was successfully done, and the multiple multi-turn injection was successively realized for 12C6+, 36Ar18+ and 129Xe27+ beams, respectively. The 129Xe27+ beams was extracted from the main ring by fast extraction. The 660MeV/u 12C6+ was injected into the experimental ring and reached an intensity of 15mA there. The first two physics experiments were done in December 2007 including the mass measurement in isochronous mode in the experimental ring. The 300MeV/u 12C4+ ions were successfully slow-extracted from the main ring in early 2008. This paper presents the main commissioning results.

  1. Recirculating linac as an injector for small storage rings or free electron lasers

    International Nuclear Information System (INIS)

    There is an increasing interest in the use of small storage rings to produce synchrotron radiation for such purposes as lithography. Clearly, such rings need injectors and the provision of these can add significantly to the overall cost of a storage ring project in terms of both hardware and space requirements. There is a need, therefore, to consider the most cost-effective way of providing for injection. It is suggested that the recirculating linac (or double-sided microtron) design meets this aim at least for injection energies up to about 450 MeV and maybe higher. The concept on which the proposal is based was first given by Kaiser, who called it a bicyclotron. The concept is described

  2. Cornell Electron Storage Ring phase-III interaction region vacuum chamber

    International Nuclear Information System (INIS)

    Two 115 in. long copper ultrahigh vacuum (UHV) chambers for the Cornell Electron Storage Ring (CESR) interaction region were fabricated. These chambers are a part of the phase-III upgrade project for the CESR storage ring. They incorporate several novel features including a remotely engaging differentially pumped Viton O ring sealed UHV flange, two rf shielded bellows joints, and inner stepped masking for synchrotron radiation. The fabrication of these chambers incorporates multistage electron beam welding to maintain the strict tolerance required for installation through superconducting and permanent quadrupole magnets. Before final welding, a series of electron beam welding setup tests were done to work out a welding procedure for optimizing the welding parameters and avoiding contamination in the weld zone. In this article we will describe the design, fabrication, welding, leak checking, and final UHV performance testing of these chambers

  3. Beta beat correction and improvement in Indus-2 storage ring performance

    International Nuclear Information System (INIS)

    The periodicity restoration or the beta beat correction is an important step to enhance the operational performance of any storage ring in terms of the better injection efficiency and improved beam lifetime etc. A method of linear beam optics from closed orbit has been used for the beta beat correction in Indus-2 store ring, where 26 power supplies driving the 72 quadrupoles are used as a degree of freedoms. In this method, the measured response matrix is fitted to the theoretical orbit response matrix and deviations of the quadrupole strengths are determined. Correction of these deviation in strengths are applied in the operating machine through the power supplies driving the quadrupoles. We will discuss the method used for the beta beat correction in Indus-2 storage ring and will present the effects of the correction on the injection efficiency and beam lifetime. (author)

  4. A betatron tune measurement system based on bunch-by-bunch transverse feedback at the Duke storage ring

    Science.gov (United States)

    Xu, Wei; Z. Wu, W.; Li, Jing-Yi; He, Duo-Hui; K. Wu, Y.

    2013-07-01

    To combat electron beam instabilities, a digital bunch-by-bunch transverse feedback (TFB) system has been developed for the Duke storage ring. While it is capable of suppressing transverse beam instabilities for multibunch operation, the TFB system has not been needed for typical operation of the Duke storage ring. To explore the great potential of this system, we have developed beam diagnostic techniques using the TFB, in particular, the TFB based tune measurement techniques. The tune measurement technique allows us to conduct fast chromaticity measurements, compared with the existing chromaticity measurement system using a network analyzer. This new tune measurement system also enables us to measure the bunch tune for multibunch operation of the Duke storage ring. With the TFB based tune measurement system, we have studied the tune stability of the electron beam in the Duke storage ring. This tune system has also been used to calibrate the tune knob for the Duke storage ring.

  5. Lifetime improvement and beam stabilization by longitudinal phase modulation at the DELTA electron storage ring

    International Nuclear Information System (INIS)

    In DELTA especially at high beam currents often the occurence of an instability of a longitudinal oscillation mode is observed. In the framework of the present thesis first with different procedure the cause of the longitudinal oscillation mode, which is especially strongly excited at high beam currents, is searched for. Thereby connections between the occurrence of this mode and parameters from the region of the storage-ring high-frequency system is observed. It is shown by comparison of different procedures, simulation calculations, and experimental pre-examinations, that especially by a phase modulation of the storage-ring high frequency an essential improvement of especially the longitudinal beam stability and the beam lifetime can be reached. For the durable and reliable improvement of these beam properties in the framework of the present thesis a system for the longitudinal phase modulation of the after-acceleration voltage in the cavity resonator of the DELTA storage ring is concipated, developed, constructed, taken in operation, and tested. Finally the results aimed hereby are presented and discussed.

  6. Bunch lengthening in the Fermilab main ring during storage

    International Nuclear Information System (INIS)

    There are two known current dependent effects which can increase the length of stored bunched beams: (1) a reduction of the potential well of the applied rf focusing system; and (2) induced unstable oscillations of the bunches, which can stabilize at a longer length by the process of Landau damping. In the first case, the current distribution in the bunches, interacting with induced electromagnetic fields in the walls, leaves a wake field which acts back on the bunches. A new equilibrium bunch shape results, different from that due to the applied rf, and this new equilibrium bunch shape will slowly establish itself as the particles within the bunch move on their new trajectories. The second form of bunch instability is the single bunch type. These are characterized by high frequency (i.e. within bunch) oscillations in the microwave region and fast growth rates. The coherent effects are very difficult to observe and such instabilities tend to simulate an incoherent growth in the bunch. An attempt is made to describe the observation of bunch lengthening in the main ring in terms of both potential well distortion and induced microwave fields. It is found that the increase in bunch size is in qualitative agreement with an induced microwave instability if the wall (i.e. chamber discontinuities) couples to beam with a broad resistive impedance in the microwave region of the order of Z/n approximately 75 OMEGA

  7. Commissioning results of the Amsterdam Pulse Stretcher/Storage ring AmPS

    International Nuclear Information System (INIS)

    AmPS has been built to enhance substantially the main specifications of the 1 % duty factor 550 MeV electron accelerator facility MEA. The maximum energy will be raised to 0.9 GeV while the duty factor increases from 1 % to approximately 100 %. To this purpose the ring AmPS was added to the facility. Simultaneously the linac was upgraded both in current and energy. Two modes of operation for the ring are implemented: a Pulse Stretcher mode with 3 turn injection creating an external beam, and a Storage Mode with multi turn injection for internal target physics. The commissioning of the ring started in April 1992. Within two months 10 % duty factor beams could be delivered for electron scattering experiments. Meanwhile the performance of the machine has been improved dramatically. The actual performance of the ring is presented and is compared with the initial design goals

  8. Experimental modelling of the dipole magnet for the electron storage ring DELSY

    CERN Document Server

    Meshkov, I N; Syresin, E M

    2003-01-01

    In the Joint Institute for Nuclear Research (Dubna) the project of Dubna Electron Synchrotron (DELSY) with an electron energy of 1.2 GeV is developed. The electron storage ring in the DELSY project is planned to be created on the basis of magnetic elements, which were used earlier in the storage ring AmPS (NIKHEF, Amsterdam). The optics of the ring is necessary to be changed, its perimeter to be reduced approximately in one and a half time, the energy of electrons to be increased. The paper is devoted to the development of a modified dipole magnet of the storage ring. The preliminary estimation of geometry of the magnet pole is carried out by means of computer modelling using two- and three- dimensional codes of the magnetic field calculation SUPERFISH and RADIA. The experimental stand for the measurements of the dipole magnetic field is described. As the result of calculational and experimental modelling for the dipole magnet, the geometry of its poles was estimated, providing in the horizontal aperture +- 3...

  9. An experimental study on the long-term stability of particle motion in hadron storage rings

    International Nuclear Information System (INIS)

    Nonlinear magnetic fields in conjunction with tune modulation may lead to chaotic particle motion and thereby limit the dynamic aperture in hadron storage rings. This is on particular interest for high energy storage rings with superconducting magnets at injection energy where magnetic field errors and the beam size have their maximum values. At the CERN SPS a dynamic aperture experiment was performed with the aim of finding the relevant effects for the stability of single particle motion in hadron storage rings. Experimental results are compared to long-term particle tracking to test to which extent computer programs can predict the dynamic aperture under well known conditions. In addition, detailed investigations of the loss mechanisms were pursued to improve the phenomenological understanding of the intricate details of particle motion in phase space. In a complementary experiment at the HERA proton ring at injection energy the dynamic aperture was measured under normal operating conditions. The computer simulations for these measurements included a very detailed model of the nonlinear fields which were measured for each individual magnet. Simulation results for the LHC are shown that estimate the effect of tune ripple of different strength on the dynamic aperture for different sets of random nonlinear field errors. (orig.)

  10. Colliding or co-rotating ion beams in storage rings for EDM search

    Science.gov (United States)

    Koop, I. A.

    2015-11-01

    A new approach to search for and measure the electric dipole moment (EDM) of the proton, deuteron and some other light nuclei is presented. The idea of the method is to store two ion beams, circulating with different velocities, in a storage ring with crossed electric and magnetic guiding fields. One beam is polarized and its EDM is measured using the so-called ‘frozen spin’ method. The second beam, which is unpolarized, is used as a co-magnetometer, sensitive to the radial component of the ring’s magnetic field. The particle’s magnetic dipole moment (MDM) couples to the radial magnetic field and mimics the EDM signal. Measuring the relative vertical orbit separation of the two beams, caused by the presence of the radial magnetic field, one can control the unwanted MDM spin precession. Examples of the parameters for EDM storage rings for protons and other species of ions are presented. The use of crossed electric and magnetic fields helps to reduce the size of the ring by a factor of 10-20. We show that the bending radius of such an EDM storage ring could be about 2-3 m. Finally, a new method of increasing the spin coherence time, the so-called ‘spin wheel’, is proposed and its applicability to the EDM search is discussed.

  11. PEGASYS---A proposed internal target facility for the PEP storage ring

    International Nuclear Information System (INIS)

    A proposal for an integral gas-jet target and forward spectrometer for the PEP storage ring is described. The beam structure, allowable, luminosity (L = 1033 cm/sup /minus/2/s/sup /minus/1/ for H2, D2) and energy (E/sub e/ ≤ 15 GeV) make the ring ideal for multiparticle coincidence studies in the scaling regime, and where perturbative QCD may be an apt description of some exclusive and semi-inclusive reactions. 14 refs., 7 figs

  12. Sodium-cooled fast reactors: the ASTRID plant project

    International Nuclear Information System (INIS)

    The ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) prototype sets out to demonstrate the progress made in SFR technology on an industrial scale by qualifying innovative options, some of which still remain open in the areas requiring improvements, especially safety and operability. It will also be used as a test bench for advanced inspection and repair techniques. More specifically, we are aiming for a level of safety that is at least equivalent to that of the EPR (third generation), with progress made in SFR-specific fields. ASTRID will also be designed to investigate and to demonstrate the feasibility of transmutation of radwaste: It will be replacing the Phenix plant in terms of an irradiation reactor so as to test homogenous and heterogeneous minor actinide recycling modes. CEA decided to launch the phase 1 of the preliminary design of the ASTRID in 2010. This paper presents ASTRID's specifications, the design options that fit these specifications in terms of core concept, of sodium risk and of fuel handling, and the current state of the project

  13. Preliminary considerations on the startup phase for the ASTRID core

    International Nuclear Information System (INIS)

    This paper presents preliminary considerations on the startup phase for the ASTRID core, as well as an overview of the different steps before reaching the optimised equilibrium core. The start-up phase is assumed to cover the period between loading the dummy core into the reactor (for commissioning tests) and achieving the optimised equilibrium core. Four main stages are considered: a first stage of start-up tests before fuel core loading, a second stage related to zero power and power ramp-up tests, a third stage corresponding to the transition from the first core to the equilibrium contractual core, and the last stage to reach the optimised performance for the equilibrium core. In the two last stages, a sub-assembly surveillance plan based on post-irradiation examinations is taken into account. As this work is in its preliminary stages, the first scenarios shown for the start-up phase must not be considered as the ASTRID reference scenarios. The scenarios strongly depend on the assumptions considered in the analysis, whereas those discussed in this paper aim at outlining the content and the duration of the starting phases for the ASTRID core, which will be useful in subsequently assessing the core sub-assembly fabrication needs. Assumptions for the start-up phase will be updated in accordance with progress on the ASTRID core design development and core qualification programme. (author)

  14. Design of main ring dipole power supply for heavy ion research facility in Lanzhou-Cooling Storage Ring

    International Nuclear Information System (INIS)

    The main dipole power supply is the pivotal device of the Heavy Ion Research Facility in Lanzhou-Cooling Storage Ring (HIRFL-CSR) project and is the most technically demanding source. A special topology and control method has been used in the power supply. This paper firstly introduces the main circuit topology, which includes a silicon controlled rectifier and a parallel switching-mode rectifier. The topology is adopted to realize the peak output power of 3.15 MW (3 kA, 1.45 kV) and pulse-mode working state. Then it presents and discusses the control method and double reference setting system of the power supply, which are used to fulfill the strict requirements especially for the tracking error (less than ± 2 x 10-4). Finally, it introduces the process of commissioning and the upgrading of the dipole power supply. (authors)

  15. Magnet power supply system for the ALS storage ring and booster

    International Nuclear Information System (INIS)

    The Magnet Power Supply System is described by specification, design, hardware, and operating experience. A unique system for the one Hz, 1.5 GeV Booster, where the wideband QF and QD power supplies track the dipole current to within 0.1% at injection will be detailed. AC distribution system considerations related to inverting the stored energy of the booster magnet back into power grid will be discussed. The rational for linear correctors and individual quad supplies (225 total units) will be placed within the context of the storage-ring requirements

  16. Alignment of Duke free electron laser storage ring and optical beam delivery system

    International Nuclear Information System (INIS)

    Duke Free Electron Laser Laboratory (DFELL) hosts a 1.1 GeV electron beam storage ring facility which is capable of generating beams in the range of nearly monochromatic gamma rays to high peak power infra red (IR) laser. In this report specifications and procedures for alignment of OK-4 /Duke storage ring FEL wiggler and optical cavity mirrors will be discussed. The OK-4 FEL lasing has demonstrated a series of world record in the last few years. In August of this year the OK-4 FEL successfully commissioned to laser at 193.7 nm. Also in this article, alignment of the γ-ray and UV optical beam delivery system that is currently in progress will be described. (authors)

  17. Spontaneous coherent microwave emission and the sawtooth instability in a compact storage ring

    Science.gov (United States)

    Arp, U.; Fraser, G. T.; Hight Walker, A. R.; Lucatorto, T. B.; Lehmann, K. K.; Harkay, K.; Sereno, N.; Kim, K.-J.

    2001-05-01

    Strong evidence for self-excited emission of coherent synchrotron radiation in the microwave spectral region was observed at the Synchrotron Ultraviolet Radiation Facility (SURF III) electron storage ring at the NIST. The microwave emission between 25 and 35 mm was dominated by intense bursts of radiation. The intensity enhancement during these bursts was on the order of 10 000 to 50 000 over the incoherent value. The shape, width, and period of the bursts depend strongly on the operational parameters of the storage ring. Coherent microwave emission was observed only when the beam was unstable, namely, during bunch-length relaxation oscillations. We report on the measurements of the microwave bursts, and correlate the data with signals from a beam monitor electrode and photodiode detector. The coherent enhancement of the radiation intensity is ascribed to spontaneous self-induced microbunching of the electrons within the bunch.

  18. Intense inverse compton {gamma}-ray source from Duke storage ring FEL

    Energy Technology Data Exchange (ETDEWEB)

    Litvinenko, V.N.; Madey, J.M.J. [Duke Univ., Durham, NC (United States)

    1995-12-31

    We suggest using FEL intracavity power in the Duke storage ring fortrays production via Inverse Compton Backscattering (ICB). The OK-4 FEL driven by the Duke storage ring will tens of watts of average lasing power in the UV/VUV range. Average intracavity power will be in kilowatt range and can be used to pump ICB source. The {gamma}-rays with maximum energy from 40 MeV to 200 MeV with intensity of 0.1-5 10{sup 10}{gamma} per second can be generated. In this paper we present expected parameters of {gamma}-ray beam parameters including its intensity and distribution. We discuss influence of e-beam parameters on collimated {gamma}-rays spectrum and optimization of photon-electron interaction point.

  19. Steady-State Microbunching in a Storage Ring for Generating Coherent Radiation

    Energy Technology Data Exchange (ETDEWEB)

    Ratner, Daniel F.; /Stanford U., Appl. Phys. Dept.; Chao, Alexander W.; /SLAC

    2011-05-19

    Synchrotrons and storage rings deliver radiation across the electromagnetic spectrum at high repetition rates, and free electron lasers (FELs) produce radiation pulses with high peak brightness. However, at present few light sources can generate both high repetition rate and high brightness outside the optical range. We propose to create steady-state microbunching (SSMB) in a storage ring to produce coherent radiation at a high repetition rate or in continuous wave (CW) mode. In this paper we describe a general mechanism for producing SSMB and give sample parameters for EUV lithography and sub-millimeter sources. We also describe a similar arrangement to produce two pulses with variable spacing for pump-probe experiments. With technological advances, SSMB could reach the soft X-ray range (< 10 nm).

  20. Predictions and expected performance for the VUV OK-5/Duke storage ring FEL with variable polarization

    CERN Document Server

    Litvinenko, V N; Vinokurov, N A

    2001-01-01

    The OK-5 FEL is the first distributed optical klystron (DOK) comprised of four electromagnetic wigglers and three bunchers. In this paper we focus on the expected performance of the OK-5/Duke storage ring FEL which will operate in the UV and the VUV ranges of spectrum and will generate intense beam of Compton backscattered gamma-rays. We present the calculation of the main parameters of the OK-5 VUV FEL such as its tuning range, gain and lasing power. Based on these calculations, we present the predictions for the OK-5 Compton gamma-ray source. We extend our prediction to the OK-5/Duke storage ring FEL with the low-emittance lattice and low impedance vacuum chambers. We also discuss briefly the mode in which one of the wigglers is tuned on a harmonic of the OK-5 FEL to provide optimal conditions for harmonic generation in VUV and soft-X-ray ranges.

  1. Study of Magnetic Hysteresis Effects in a Storage Ring Using Precision Tune Measurement

    CERN Document Server

    Li, Wei; Mikhailov, Stepan F; Xu, Wei; Li, Jing-Yi; Li, Wei-Min; Wu, Ying K

    2016-01-01

    With advances in accelerator science and technology in the recent decades, the accelerator community has focused on the development of next-generation light sources, for example the diffraction-limited storage rings (DLSRs), which requires precision control of the electron beam energy and betatron tunes. This work is aimed at understanding magnet hysteresis effects on the electron beam energy and lattice focusing in the circular accelerators, and developing new methods to gain better control of these effects. In this paper, we will report our recent experimental study of the magnetic hysteresis effects and their impacts on the Duke storage ring lattice using the transverse feedback based precision tune measurement system. The major magnet hysteresis effects associated with magnet normalization and lattice ramping are carefully studied to determine an effective procedure for lattice preparation while maintaining a high degree of reproducibility of lattice focusing. The local hysteresis effects are also studied...

  2. Electron beam properties and impedance characterization for storage rings used for free electron lasers

    International Nuclear Information System (INIS)

    Good electron beam qualities and stability are the crucial features of Storage Rings dedicated to synchrotron radiation sources or to Free Electron Laser. Most of these characteristics depends on the coupling of the e-beam with the machine environment, which can be in turn modelled in terms of a characteristic impedance, whose absolute value and structure can be used to specify both the stability (longitudinal and transverse) of the beam and its qualities (energy spread, bunch length, peak current ...). In this paper are considered two specific examples of Storage Rings used for FEL operation and analyze their performances by means of semi analytical and numerical methods. The analysis is aimed at clarifying the dependence of beam energy spread and bunch length on beam current and at providing a set of parameters useful for the optimization of Free Electron Laser or synchrotron radiation sources

  3. General vibration monitoring: Coupling between the experimental hall structure and storage ring tunnel and basemat

    International Nuclear Information System (INIS)

    The primary objective of this study was to measure the coupling between the experimental hall structure and the storage ring tunnel. The study was motivated in part by concern over the potential for wind excitation of the building to couple through the ground and/or piping/ductwork to the storage ring basemat. Unfortunately, there was very little wind on the measurement date. However, it can be assumed that the wind turbulence would excite the experimental hall structure at one or more of its resonant frequencies. Similar coupling information can be obtained by using ambient vibration as the excitation source and measuring the resultant structure/basemat response and associated coupling. This was the approach taken in this study

  4. X-ray spectroscopy of highly-charged ions in a storage ring. Invited lecture

    International Nuclear Information System (INIS)

    The purpose of the present lectures is to carry through the methods and procedures necessary for a meaningful spectroscopy of the heaviest few-electron ions in relation to present theories. Results achieved so far in accelerator-based X-ray experiments are highlighted with emphasis on recent developments on heavy-ion storage rings. Starting with a brief account of the basics of one-electron ions, the motivation for doing X-ray spectroscopy of the simplest atomic systems with a high nuclear charge is given. In section 2 X-ray instrumentation and techniques are discussed including the precautions necessary when dealing with fast-beam sources. Peculiarities of heavy-ion storage rings are investigated in section 3 with regard to their use for spectroscopy. In section 4 are discussed results obtained so far on the measurement of the Lamb shift in very heavy ions. Section 5 gives some perspectives for the near future. (orig.)

  5. The control system for the dedicated synchrotron radiation storage ring BESSY

    International Nuclear Information System (INIS)

    BESSY is a 800 MeV electron-storage ring dedicated to research with synchrotron radiation in the VUV and soft X-ray region. The storage ring is fed by a 800 MeV separated function synchrotron with a clasical 20 MeV microtron as preinjector. The machines are remotely controlled by four minicomputers which are linked by a local network. The computers are connected to a commercially available electronic interface system. The general philosophy for the system design was determined by boundary conditions such as reliable processor hardware, reliable and powerful multi-user multi-programming real-time operating systems, well developed software tools, a ready-to-use distributed network with high throughput, compatibility of the electronic interface system, locally available service shops, and, if possible, the avoidance of assembly coding. This paper describes in detail the system which ultimately met these criteria and was subsequently implemented at BESSY

  6. An OPERA-3D Model of Muon Injection in the Muon g - 2 Storage Ring

    Science.gov (United States)

    Vallina, Lia

    2014-03-01

    The muon g - 2 experiment at Fermilab will measure the anomalous magnetic moment of the muon to 140 parts-per-billion. The modern experimental technique utilizes a superconducting storage ring to produce an extremely uniform magnetic field. Since the experimental systematic uncertainties scales with the non-uniformity of the magnetic field, care must be taken to minimize distortions to the field. The injection point of the muon beam into the storage ring requires special attention. In this talk, the experimental concept and the use of a superconducting inflector magnet at the injection point will be outlined. Our efforts to model this critical region in the electromagnetic simulation software, OPERA, will be described.

  7. Design of a Bow-Tie Shaped 50 GeV Muon Storage Ring

    CERN Document Server

    Keil, Eberhard

    2000-01-01

    The design of a muon storage ring for a neutrino factory is described. It operates at 50 GeV and has a bowtie shape. It sends neutrino beams from two long straight sections with a small muon beam divergence to two distant detectors at 1000 and 3000 km distance. It is designed for a normalised emittance of about 1.67 mm and an rms momentum spread of 0.5 %. The procedure for arriving at the parameters of the optical modules and of the whole storage ring and their values are given. The verification of the optical design includes tracking many thousands of muons for their lifetime, and demonstrates that the dynamic aperture is larger than the physical one. The parameters of the RF system and of the fast injection kickers are also considered.

  8. General vibration monitoring: Coupling between a storage ring tunnel I-beam support structure and the tunnel/basemat

    International Nuclear Information System (INIS)

    The primary objective of this study was to measure the coupling between a specific I-beam support structure, cantilevered from the infield side of the storage ring tunnel, and the storage ring tunnel/basemat. The support structure is mechanically connected to the side of the tunnel. It has the potential for a large resonant response and coupling to the storage ring basemat through its mechanical mounting or through the many pipes and ducts fastened to it. Impact excitation force was used to determine the lowest resonant frequency of the structure. Ambient vibration was used as the excitation source for studying the coupling

  9. Intensity-sensitive and position-resolving cavity for heavy-ion storage rings

    Science.gov (United States)

    Chen, X.; Sanjari, M. S.; Hülsmann, P.; Litvinov, Yu. A.; Nolden, F.; Piotrowski, J.; Steck, M.; Stöhlker, Th.; Walker, P. M.

    2016-08-01

    A heavy-ion storage ring can be adapted for use as an isochronous mass spectrometer if the ion velocity matches the transition energy of the ring. Due to the variety of stored ion species, the isochronous condition cannot be fulfilled for all the ions. In order to eliminate the measurement uncertainty stemming from the velocity spread, an intensity-sensitive and position-resolving cavity is proposed. In this paper we first briefly discuss the correction method for the anisochronism effect in the measurement with the cavity. Then we introduce a novel design, which is operated in the monopole mode and offset from the central beam orbit to one side. The geometrical parameters were optimized by analytic and numerical means in accordance with the beam dynamics of the future collector ring at FAIR. Afterwards, the electromagnetic properties of scaled prototypes were measured on a test bench. The results were in good agreement with the predictions.

  10. Analytical Benchmarking, Precision Particle Tracking, Electric and Magnetic Storage Rings, Runge-Kutta, Predictor-Corrector

    CERN Document Server

    Metodiev, E M; Fandaros, M; Haciomeroglu, S; Huang, D; Huang, K L; Patil, A; Prodromou, R; Semertzidis, O A; Sharma, D; Stamatakis, A N; Orlov, Y F; Semertzidis, Y K

    2015-01-01

    A set of analytical benchmarks for tracking programs are required for precision storage ring experiments. To determine the accuracy of precision tracking programs in electric and magnetic rings, a variety of analytical estimates of particle and spin dynamics in the rings are developed and compared to the numerical results of tracking simulations. Initial discrepancies in the comparisons indicated the need for improvement of several of the analytical estimates. As an example, we find that the fourth order Runge-Kutta/Predictor-Corrector method was accurate but slow, and that it passed all the benchmarks it was tested against, often to the sub-part per billion level. Thus high precision analytical estimates and tracking programs based on fourth order Runge-Kutta/Predictor-Corrector integration can be used to benchmark faster tracking programs for accuracy.

  11. The Concept of Antiproton Accumulation in the RESR Storage Ring of the FAIR Project

    CERN Document Server

    Steck, Markus; Dolinskyy, Oleksiy; Franzke, Bernhard; Katayama, Takeshi; Litvinov, Sergey; Nolden, Fritz; Peschke, Claudius; Mohl, Dieter; Thorndahl, Lars

    2010-01-01

    The RESR storage ring of the FAIR projectwas designed for use as an accumulator ring for antiprotons. Therefore its optical design offers a large momentum acceptance and large flexibility in the choice of the working point. This is crucial, if longitudinal stacking with a stochastic cooling system is planned. The accumulation system has been studied in simulations which include both the properties of the optical design and details of the stochastic cooling system. The simulations confirm that the stochastic cooling system can support the accumulation with a repetition rate of 10 s for the injection of pre-cooled batches of 108 antiprotons from the collector ring CR. A maximum of intensity of 1011 accumulated antiprotons can be achieved as required for high luminosity experiments

  12. Measurement and analysis of the impact of transverse incoherent wakefields in a light source storage ring

    Science.gov (United States)

    Brunelle, P.; Nagaoka, R.; Sreedharan, R.

    2016-04-01

    The influence of incoherent wakefields arising from a high current beam circulating in a ring composed of many flat chambers on the beam is analyzed numerically and experimentally for the SOLEIL storage ring. Three distinct ranges of the excited field are studied: the long multiturn regime in multibunch fillings, the medium regime involving neighboring bunches, and the short intrabunch regime. Two theoretical models, which both take into account the field diffusion across chamber walls of finite thickness, are employed to compare the measurement with theoretical expectations. Specific experimental methods, based respectively upon orbit analysis, bunch-by-bunch transverse feedback and a single particle betatron resonance, are introduced to measure the incoherent focusing effect in the three regimes. It is found that the excited incoherent fields can be large enough to affect the ring performance. The non-negligible contribution of nonevaporable getter coating is shown to improve the agreement between measurements and calculations.

  13. Pulse propagation in storage ring free electron laser devices and longitudinal instabilities

    CERN Document Server

    Bartolini, R; Giannessi, L; Mezi, L

    2002-01-01

    We develop a self-consistent general purpose code modelling the storage ring free electron laser devices. The code accounts for the beam longitudinal dynamics and the laser pulse propagation and is capable of reproducing the wealth of phenomenology associated with the laser-electron beam interplay and provides a deeper understanding of the mechanisms underlying the role of the laser in the suppression of instabilities of longitudinal type.

  14. Experimental study on high-voltage nanosecond generators of the 'Sibir'-2' storage ring injection system

    International Nuclear Information System (INIS)

    Results of the investigation of operating modes of pulse generators of the injection system of the 'Sibir'-2' storage ring the synchrotron radiation source are presented. Generators are constructed as coaxial type double-shaping lines with the control via the gas-filled three-electrode spark gaps. Test results revealed, that generators meet the requirements to output voltage of up to 60 kw, pulse rise time of about 3 ns and timing stability. 1 ref., 3 figs

  15. Nonlinear Accelerator Problems via Wavelets: 1. Orbital Motion in Storage Rings

    OpenAIRE

    Fedorova, Antonina N.; Zeitlin, Michael G.

    1999-01-01

    In this series of eight papers we present the applications of methods from wavelet analysis to polynomial approximations for a number of accelerator physics problems. In this part, according to variational approach we obtain a representation for orbital particle motion in storage rings as a multiresolution (multiscales) expansion in the base of well-localized in phase space wavelet basis. By means of this "wavelet microscope" technique we can take into account contribution from each scale of ...

  16. Cascade Problems in Some Atomic Lifetime Measurements at a Heavy-Ion Storage Ring

    Energy Technology Data Exchange (ETDEWEB)

    Trabert, E; Hoffmann, J; Krantz, C; Wolf, A; Ishikawa, Y; Santana, J

    2008-10-09

    Lifetimes of 3s{sup 2}3p{sup k} ground configuration levels of Al-, Si-, P-, and S-like ions of Be, Co, and Ni have been measured at a heavy-ion storage ring. Some of the observed decay curves show strong evidence of cascade repopulation from specific 3d levels that feature lifetimes in the same multi-millisecond range as the levels of the ground configuration.

  17. Equation of spin motion in storage rings in a cylindrical coordinate system

    OpenAIRE

    Silenko, A. J.

    2004-01-01

    The exact equation of spin motion in a cylindrical coordinate system with allowance for electric dipole moments of particles has been derived. This equation is convenient for analytical calculations of spin dynamics in circular storage rings when the configuration of main fields is simple enough. The generalized formula for the influence of a vertical betatron oscillation on the angular velocity of spin rotation has been found. This formula agrees with the previously obtained result and conta...

  18. Design summary of the magnet support structures for the proton storage ring injection line upgrade

    International Nuclear Information System (INIS)

    This report summarizes the technical engineering and design issues associated with the Proton Storage Ring (PSR) Injection Line upgrade of the Los Alamos Neutron Science Center (LANSCE). The main focus is on the engineering design calculations of several magnet support structures. The general procedure based upon a set number of design criteria is outlined, followed by a case-by-case summary of the engineering design analyses, reutilization or fabrication callouts and design safety factors

  19. Dynamical aspects on FEL interaction in single passage and storage ring devices

    Energy Technology Data Exchange (ETDEWEB)

    Dattoli, G.; Renieri, A. [ENEA, Frascati (Italy)

    1995-12-31

    The dynamical behaviour of the free-electron lasers is investigated using appropriate scaling relations valid for devices operating in the low and high gain regimes, including saturation. The analysis is applied to both single passage and storage ring configurations. In the latter case the interplay between the interaction of the electron bean with the laser field and with the accelerator environment is investigated. In particular we discuss the effect of FEL interaction on the microwave instability.

  20. Pulse propagation in storage ring free electron laser devices and longitudinal instabilities

    International Nuclear Information System (INIS)

    We develop a self-consistent general purpose code modelling the storage ring free electron laser devices. The code accounts for the beam longitudinal dynamics and the laser pulse propagation and is capable of reproducing the wealth of phenomenology associated with the laser-electron beam interplay and provides a deeper understanding of the mechanisms underlying the role of the laser in the suppression of instabilities of longitudinal type

  1. Non-linearity correction of Schottky diode THz detector system using CSR burst from storage ring

    International Nuclear Information System (INIS)

    We show a practical method to calibrate non-linearity of Schottky diode detector for the short-pulsed THz radiation from the electron storage ring. A frequency distribution of pulse area was measured at three distances of the detector from the radiation source. Non-linearity correction function was obtained by a condition that the three distribution should be the same with non-linearity correction and reduction factor by the distance. (author)

  2. A Storage Ring Experiment to Detect a Proton Electric Dipole Moment

    CERN Document Server

    Anastassopoulos, V; Baartman, R; Bai, M; Baessler, S; Benante, J; Berz, M; Blaskiewicz, M; Bowcock, T; Brown, K; Casey, B; Conte, M; Crnkovic, J; Fanourakis, G; Fedotov, A; Fierlinger, P; Fischer, W; Gaisser, M O; Giomataris, Y; Grosse-Perdekamp, M; Guidoboni, G; Haciomeroglu, S; Hoffstaetter, G; Huang, H; Incagli, M; Ivanov, A; Kawall, D; Khazin, B; Kim, Y I; King, B; Koop, I A; Larsen, R; Lazarus, D M; Lebedev, V; Lee, M J; Lee, S; Lee, Y H; Lehrach, A; Lenisa, P; Sandri, P Levi; Luccio, A U; Lyapin, A; MacKay, W; Maier, R; Makino, K; Malitsky, N; Marciano, W J; Meng, W; Meot, F; Metodiev, E M; Miceli, L; Moricciani, D; Morse, W M; Nagaitsev, S; Nayak, S K; Orlov, Y F; Ozben, C S; Park, S T; Pesce, A; Pile, P; Polychronakos, V; Podobedov, B; Pretz, J; Ptitsyn, V; Ramberg, E; Raparia, D; Rathmann, F; Rescia, S; Roser, T; Sayed, H Kamal; Semertzidis, Y K; Senichev, Y; Sidorin, A; Silenko, A; Simos, N; Stahl, A; Stephenson, E J; Stroeher, H; Syphers, M J; Talman, J; Talman, R M; Tishchenko, V; Touramanis, C; Tsoupas, N; Venanzoni, G; Vetter, K; Vlassis, S; Won, E; Zavattini, G; Zelenski, A; Zioutas, K

    2015-01-01

    A new experiment is described to detect a permanent electric dipole moment of the proton with a sensitivity of $10^{-29}e\\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant to the experiment are discussed and techniques to address them are presented. The measurement is sensitive to new physics beyond the Standard Model at the scale of 3000~TeV.

  3. High effective neutron generation in deuteron storage ring for radioactive waste transmutation

    International Nuclear Information System (INIS)

    Neutron generation under interaction of 100 MeV deuteron flux circulating in storage ring with light substance target is studied. The deuterium target is most preferable for generation of intensive neutron fluxes with minimum energy consumption. Burnup cross sections for 90Sr and 137Cs within the neutron energy range of 8-100 MeV are calculated. 9 refs., 3 figs., 2 tabs

  4. Measurements of Electric Dipole Moments of Charged Particles at Storage Rings

    OpenAIRE

    Hejny, Volker; JEDI Collaboration

    2014-01-01

    Electric Dipole Moments (EDM) of elementary particles are considered to be one of the most powerful tools to investigate CP violation beyond the Standard Model and to find an explanation for the dominance of matter over antimatter in our universe. Up to now experiments concentrated on neutral systems (neutrons, atoms, molecules). Storage rings offer the possibility to measure EDMs of charged particles by observing the influence of the EDM on the spin motion. The Cooler Synchrotron COSY at the...

  5. Laser cooling and ion beam diagnosis of relativistic ions in a storage ring

    International Nuclear Information System (INIS)

    Particle accelerator and storage ring technology has reached an advanced state, so that different heavy ion storage rings are coming into operation by now, capable of storing even fully stripped ions up to U92+. The main purpose of these machines are the accumulation of ions and the ability of improving the beam quality, that is the phase space density of the stored beams. This beam cooling is done successfully by the well established stochastic and electron cooling techniques. A new cooling method, the laser cooling, is taken over from atomic beam and ion trap experiments, where it has yielded extremely low temperatures of atomic samples. As a canditate at storage rings 7Li+ ions are stored in the Heidelberg TSR at 13.3 MeV. The ion beam properties of the metastable fraction like momentum spread, storage time and the influence of residual gas scattering are investigated by colinear laser spectroscopy in the experimental section of the TSR. An optical pumping experiment using two dye laser systems yields information about ion kinematics and velocity mixing processes in the ring. Lifetimes in the order of 100 ms for velocity classes marked in this way show that laser cooling can be applied to the stored 7Li+ beam. In an experimental situation of two strong counterpropagating laser beams, both tuned near resonance, a dramatic reduction of the ion beam momentum spread is observed. With a special geometrical control of laser and ion beam the longitudinal beam temperature is reduced from 260 K to at least 3 K with very high collection efficiency. (orig./HSI)

  6. Many-particle rapidity correlations in light-ion interactions at the CERN Intersecting Storage Rings

    International Nuclear Information System (INIS)

    Many-particle rapidity correlations have been studied for αα, dd, and pp interactions at the CERN Intersecting Storage Rings using the Split-Field Magnet detector, and basing the investigating on the distributions of rapidity gaps between particles. In the framework of a simple cluster model, it is found that all the data samples have similar features and that the events contain clusters of two different types. (orig.)

  7. Computer-aided studies of the ALS 500 MHz storage ring cavity

    International Nuclear Information System (INIS)

    The design of the ALS storage ring 500 MHz cavity has been modeled with Mafia and Urmel codes. The effects of the holes cut for the drive port, the higher order mode damping port, the probe port and tuner plunger were modeled with the Mafia codes. The frequency dependence on the shape and spacing of the nose cones and the general shape of the cavity were modeled with Urmel codes. 9 refs., 7 figs., 1 tab

  8. Evidence for a directional dependence of Bose-Einstein correlations at the CERN intersecting storage rings

    International Nuclear Information System (INIS)

    In pp and panti p collisions at the CERN Intersecting Storage Rings, a directional dependence of the size of the pion-emitting region is observed using Bose-Einstein interference between identical charged pions. The data reveal a substantially larger dimension in the direction parallel to the beam axis than in the transverse direction, indicating a prolate shape of the emission region. For αα interactions, the data are consistent with a spherical shape. (orig.)

  9. Charged particle production and correlations at high transverse momentum at the CERN intersecting storage rings

    International Nuclear Information System (INIS)

    We study the production of identified charged particles in pp collisions at c.m. energy of 63 GeV in events with an identified high-psub(T) trigger particle. The measurements were performed at the CERN Intersecting Storage Rings using the Axial Field Spectrometer. Production ratios are presented as a function of psub(T) in the range 2.5 to 8 GeV/c. (orig.)

  10. Stability of Coulomb crystals in a linear Paul trap with storage-ring-like confinement

    DEFF Research Database (Denmark)

    Kjærgaard, Niels; Mølhave, Kristian; Drewsen, Michael

    2002-01-01

    We report experiments on the stability of ion Coulomb crystals in a linear Paul trap with storage-ring-like confinement. The transverse dynamics of charged particles in a trap of this type is analogous to that of a fast beam traveling through a channel with periodic, magnetic alternating gradient...... confinement. The experimentally observed stability conditions for stationary crystals comply remarkably well with current theory of crystalline plasmas and beams....

  11. Optimization of magnet sorting in a storage ring using genetic algorithms

    International Nuclear Information System (INIS)

    In this paper, the genetic algorithms are applied to the optimization problem of magnet sorting in an electron storage ring, according to which the objectives are set so that the closed orbit distortion and beta beating can be minimized and the dynamic aperture maximized. The sorting of dipole, quadrupole and sextupole magnets is optimized while the optimization results show the power of the application of genetic algorithms in magnet sorting. (authors)

  12. The Heidelberg High Current Injector: A Versatile Injector for Storage Ring Experiments

    OpenAIRE

    von Hahn, R.; Grieser, M.; Repnow, R.; Schwalm, D.; Welsch, C.

    2004-01-01

    The High Current Injector (HCI) was designed and built as a dedicated single turn injector for the Test Storage Ring in Heidelberg to deliver mainly very high intensities of singly charged Li- and Be-ions for laser cooling experiments. After start of routine operation in 1999 the HCI delivered high quality beams for about 25% of the experiments with very high reliability. Due to the experimental requirements the HCI mutated from a specialized injector to a versatile multipurpose instrumen...

  13. Electron-ion merged-beam experiments at heavy-ion storage rings

    OpenAIRE

    Schippers, Stefan

    2014-01-01

    In the past two decades, the electron-ion merged-beams technique has extensively been exploited at heavy-ion storage rings equipped with electron coolers for spectroscopic studies of highly charged ions as well as for measuring absolute cross sections and rate coefficients for electron-ion recombination and electron-impact ionization of multiply charged atoms ions. Some recent results are highlighted and future perspectives are pointed out, in particular, in view of novel experimental possibi...

  14. Performance and upgrades of the NSLS storage rings and photon sources

    International Nuclear Information System (INIS)

    The usefulness of synchrotron radiation sources is not only determined by current, energy and magnetic field but also orbit stability and lifetime. The status and developments at NSLS in storage ring performance are discussed. Efforts at NSLS to look toward the future in source development are presented. In particular, small gap undulator development and studies toward development of UV Free Electron Laser at the Accelerator Test Facility are described. 5 refs., 2 figs., 1 tab

  15. Magnet power supply control of the NSLS VUV and x-ray storage rings transfer lines

    International Nuclear Information System (INIS)

    The transfer lines for NSLS VUV and x-ray storage rings have been split. New power supplies have been incorporated with existing ones. The existing microprocessor system has been upgraded in order to control the additional functions. This system expands the input/output port of the microprocessor to an addressable serial/parallel link to each magnet power supply. The implementation of this system will be discussed

  16. Precise measurement of millisecond atomic lifetimes with heavy-ion storage ring and EBIT

    Energy Technology Data Exchange (ETDEWEB)

    Traebert, E. [I.P.N.E., Univ. de Liege, Liege (Belgium)]|[Bochum Univ. (Germany). Fakultaet fuer Physik und Astronomie]|[Lawrence Livermore National Lab., Livermore, CA (United States)

    2001-07-01

    Atomic lifetime measurements in the millisecond range have provided transition rates of intercombination and forbidden transitions in a number of ions. However, at the often claimed high level of precision, discrepancies appear between the results from different devices (Kingdon-type electrostatic ion trap, radiofrequency ion trap, electron beam ion trap and heavy-ion storage ring) measuring the same or comparable atomic systems. This calls for an assessment of the quality of typical measurements. (orig.)

  17. Fokker - Planck equation solver for study stochastic cooling in storages rings

    International Nuclear Information System (INIS)

    In this paper so-called the PDE-method for solution of the Fokker - Planck Equation is proposed to study the beam dynamic in the storage ring, where the stochastic cooling is used. This method has been implemented in the new FOPLEQ code. The results of numerical calculations obtained by this code are presented. Calculated results by PDE-method are compared with other numerical algorithms. Application, stability, convergence and precision of the proposed method are discussed.

  18. Spin decoherence in electron storage rings --- more from a simple model

    CERN Document Server

    Barber, D P

    2015-01-01

    This is an addendum to the paper "Some models of spin coherence and decoherence in storage rings" by one of the authors [1] in which spin diffusion in simple electron storage rings is studied. In particular, we illustrate in a compact way, a key implication in the Epilogue of [1], namely that the exact formalism of [1] delivers a rate of depolarisation which can differ from that obtained by the conventional treatments of spin diffusion which rely on the use of the derivative $\\partial \\hat n/\\partial\\eta$ [2,3,4]. As a vehicle we consider a ring with a Siberian Snake and electron polarisation in the plane of the ring (Machine II in [1]). For this simple setup with its one-dimensional spin motion, we avoid having to deal directly with the Bloch equation [5,6] for the polarisation density. Our treatment, which is deliberately pedagogical, shows that the use of $\\partial \\hat n/\\partial\\eta$ provides a very good approximation to the rate of spin depolarisation in the model considered. But it then shows that the ...

  19. Spin decoherence in electron storage rings. More from a simple model

    Energy Technology Data Exchange (ETDEWEB)

    Barber, D.P. [Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); Heinemann, K. [The Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Mathematics and Statistics

    2015-06-15

    This is an addendum to the paper ''Some models of spin coherence and decoherence in storage rings'' by one of the authors (K. Heinemann, DESY Report 97-166 (1997)), in which spin diffusion in simple electron storage rings is studied. In particular, we illustrate in a compact way, namely that the exact formalism of this article delivers a rate of depolarisation which can differ from that obtained by the conventional treatments of spin diffusion which rely on the use of the derivative ∂n/∂η. As a vehicle we consider a ring with a Siberian Snake and electron polarisation in the plane of the ring. For this simple setup with its one-dimensional spin motion, we avoid having to deal directly with the Bloch equation for the polarisation density. Our treatment, which is deliberately pedagogical, shows that the use of ∂n/∂η provides a very good approximation to the rate of spin depolarisation in the model considered. But it then shows that the exact rate of depolarisation can be obtained by replacing ∂n/∂η by another derivative, while giving a heuristic justification for the new derivative.

  20. Coherent instability of the heavy ion beam in the storage ring

    International Nuclear Information System (INIS)

    The storage ring as the final part of a driver for heavy ion fusion is required to provide heavy ions (A asymptotically equals 200) with energy of 5 -- 10 GeV and such a high intensity as 1 -- 6 x 1015 ions/pulse. So as to raise the number of ions which can be accumulated in a ring, singlly charged heavy ion is used for its relatively smaller incoherent space charge force compared with higher charge states. The intensity limit due to incoherent space charge force is 0.7 -- 1.4 x 1015 ions for U1+. Much more severe limits exist due to coherent motion of heavy ion beams (0.8 -- 2 x 1013 for longitudinal motion and 0.9 -- 1.1 x 1012 for transverse motion), because of the relatively lower velocity of the accumulated ions. It seems unrealistic to use a lot of rings in order to operate below such intensity limits of the above instability. Therefore the number of the storage rings is constrained within a reasonable value (3 -- 7) and the possibility of compressing the bunches of heavy ion beams before the instability grows fatally large is studied. (author)

  1. On deflection fields, weak-focusing and strong-focusing storage rings for polar molecules

    CERN Document Server

    de Nijs, Adrian J

    2011-01-01

    In this paper, we analyze electric deflection fields for polar molecules in terms of a multipole expansion and derive a simple but rather insightful expression for the force on the molecules. Ideally, a deflection field exerts a strong, constant force in one direction, while the force in the other directions is zero. We show how, by a proper choice of the expansion coefficients, this ideal can be best approximated. We present a design for a practical electrode geometry based on this analysis. By bending such a deflection field into a circle, a simple storage ring can be created; the direct analog of a weak-focusing cyclotron for charged particles. We show that for realistic parameters a weak-focusing ring is only stable for molecules with a very low velocity. A strong-focusing (alternating-gradient) storage ring can be created by arranging many straight deflection fields in a circle and by alternating the sign of the hexapole term between adjacent deflection fields. The acceptance of this ring is numerically ...

  2. Time structure measurement of the SSRF storage ring using TRXEOL method

    Institute of Scientific and Technical Information of China (English)

    张招红; 姜政; 薛松; 郑丽芳

    2015-01-01

    In order to do alignment between the timing signal and the synchrotron X-ray pulse on the sample spot in the time domain, measuring time structure of the storage ring on the sample spot inside the experimental hutch is a foundational step during the time-resolved experiments using the pulsed synchrotron X-rays with the time structure defined by the storage ring. In this work, the method of time-resolved X-ray excited optical luminescence (TRXEOL) was designed and implemented to do the measurement. It is based on the principle of time-correlated single photon counting techniques. The measurement system consists of a spectrometer with a detector of photomultiplier tube, a timing system, a set of nuclear instrument modules and a luminescent material of zinc oxide. The measurement was performed on the X-ray absorbed fine structure spectrum beamline at Shanghai Synchrotron Radiation Facility. The results show that this method can be used to measure the time structure of the storage ring with a precision of less than 1 ns. The measurement system can also be used for the time-resolved research for the optical luminescent materials.

  3. A parallel simplex optimizer and its application to high-brightness storage ring design

    International Nuclear Information System (INIS)

    An efficient parallel Simplex optimizer was developed that can on run Solaris and Linux clusters. It can optimize the result of running essentially any program or script that returns a penalty function value. We have used this optimizer with elegant to optimize the dynamic aperture of storage ring designs. This paper discusses the optimization algorithm and performance, design of penalty functions, optimization results, and applications in storage ring design. Optimization is commonly used in accelerator design to find linear optics solutions. Such optimizations are usually fairly fast as linear optics computations are themselves fast. For high-brightness storage rings, optimization of nonlinear elements (e.g., sextupoles) is also important in obtaining sufficient dynamic aperture. However, such optimization can be very time consuming as the basic computations are time consuming. For this reason, we developed an efficient parallel Simplex optimizer that can run on Solaris and Linux clusters. It can optimize the result of running essentially any program or script that returns a penalty function value.

  4. Modeling the Transverse Linear Optics of a Charged Particle Storage Ring

    International Nuclear Information System (INIS)

    Charged particle storage rings play a key role in the frontiers of high-energy physics. For the most part, however, particle physics is largely unaccessible to undergraduate-level students, discouraging such students from taking an early interest in it. It is our premise, however, that the fundamental physics of storage rings can, in fact, be taught at this stage, fostering interest in accelerator physics. In this paper we present an introduction to the transverse linear optics of a charged particle storage ring suitable for second-year undergraduates. We begin by introducing transverse motion in the one-dimensional case to establish a familiarity with linear lattices. We then move on to our primary goal which is to analytically decompose a coupled two-dimensional system with a minimal amount of axiomatic treatment (the derivation of the decoupling matrix, for example). While this is by no means a comprehensive exposition on beam dynamics, it serves to provide meaningful insight into the fundamental physics involved in these machines for introductory students. It is our hope that this approach can be extended to other aspects of high-energy physics so that undergraduates may have a better glimpse at the frontiers of their field

  5. TIG welding of aluminum alloys for the APS storage ring - a UHV application

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) incorporates a 7-GeV positron storage ring 1104 meters in circumference. The storage ring vacuum system is designed to maintain a pressure of 1 nTorr or less with a circulating current of 300 mA to enable beam lifetimes of greater than 10 hours. The vacuum chamber is an aluminum extrusion of 6063T5 alloy. There are 235 separate aluminum vacuum chambers in the storage ring connected by stainless steel bellows assemblies. Aluminum was chosen for the vacuum chamber because it can be economically extruded and machined, has good thermal conductivity, low thermal emissivity, a low outgassing rate, low residual radioactivity, and is non-magnetic. The 6063 aluminum-silicon-magnesium alloy provides high strength combined with good machining and weldability characteristics. The extrusion process provides the interior surface finish needed for the ultrahigh vacuum (UHV) environments There are six different vacuum chambers with the same extrusion cross section. The average vacuum chamber length is 171.6 inches. The extruded vacuum chambers are welded to flange assemblies made up of machined 2219 aluminum alloy pieces and 2219 aluminum vacuum flanges from a commercial source

  6. TIG welding of aluminum alloys for the APS storage ring - a UHV application

    Energy Technology Data Exchange (ETDEWEB)

    Goeppner, G.A.

    1996-05-29

    The Advanced Photon Source (APS) incorporates a 7-GeV positron storage ring 1104 meters in circumference. The storage ring vacuum system is designed to maintain a pressure of 1 nTorr or less with a circulating current of 300 mA to enable beam lifetimes of greater than 10 hours. The vacuum chamber is an aluminum extrusion of 6063T5 alloy. There are 235 separate aluminum vacuum chambers in the storage ring connected by stainless steel bellows assemblies. Aluminum was chosen for the vacuum chamber because it can be economically extruded and machined, has good thermal conductivity, low thermal emissivity, a low outgassing rate, low residual radioactivity, and is non-magnetic. The 6063 aluminum-silicon-magnesium alloy provides high strength combined with good machining and weldability characteristics. The extrusion process provides the interior surface finish needed for the ultrahigh vacuum (UHV) environments There are six different vacuum chambers with the same extrusion cross section. The average vacuum chamber length is 171.6 inches. The extruded vacuum chambers are welded to flange assemblies made up of machined 2219 aluminum alloy pieces and 2219 aluminum vacuum flanges from a commercial source.

  7. Some fundamental aspects of fluctuations and coherence in charged-particle beams in storage rings

    International Nuclear Information System (INIS)

    A conceptual survey and exposition is presented of some fundamental aspects of fluctuations and coherence, as well as the interplay between the two, in coasting charged-particle beams - both continuous and bunched - in storage rings. A detailed study is given of the spectral properties of the incoherent phase-space Schottky fluctuations, their propagation as waves in the beam, and the analytic complex coherent beam electromagnetic response or transfer function. The modification or distortion of these by collective interactions is examined in terms of simple regeneration mechanisms. Collective or coherent forces in the beam-storage-ring system are described by defining suitable impedance functions or propagators, and a brief discussion of the coherent collective modes and their stability is provided, including a general and rigorous description of the Nyquist stability criterion. The nature of the critical fluctuations near an instability threshold is explored. The concept of Landau damping and its connection with phase-mixing within the beam is outlined. The important connection between the incoherent fluctuations and the beam response, namely the Fluctuation-Dissipation relation, is revealed. A brief discussion is given of the information degrees of freedom, and effective temperature of the fluctuation signals. Appendices provide a short resume of some general aspects of various interactions in a charged-particle beam-environment system in a storage ring and a general introduction to kinetic theory as applied to particle beams. (orig.)

  8. Potential for measurement of the tensor electric and magnetic polarizabilities of the deuteron in storage-ring experiments with polarized beams

    OpenAIRE

    Baryshevsky, V. G.; Silenko, A. J.

    2010-01-01

    Measurement of the tensor electric and magnetic polarizabilities of the deuteron is of great interest, especially in connection with the possibilities of COSY and GSI. These polarizabilities can be measured in storage rings by the frozen spin method providing a disappearance of g-2 precession. This method will be used in the planned deuteron electric-dipole-moment experiment in storage rings. The tensor electric polarizability of the deuteron significantly influences the buildup of the vertic...

  9. Beam uniformization and low frequency RF cavities in compact electron storage rings

    Science.gov (United States)

    Pham, Alfonse N.

    An electron storage ring is currently under construction at Indiana University for extreme environment radiation effects experiments, x-ray production, and particle beam dynamics experiments. For an electron bunch to be successfully stored for long durations, a radio-frequency (RF) resonant structure will be used to provide an adequate RF bucket for longitudinal focusing and replenishment of energy electrons loses via synchrotron radiation. Due to beam line space limitation that are inherent to compact circular particle accelerators, a unique ferrite-loaded quarter-wave RF resonant cavity has been designed and constructed for use in the electron storage ring. The physics of particle accelerators and beams, ferrite-loaded RF resonant cavity theory, and results of the Poisson-SUPERFISH electromagnetic field simulations that were used to guide the specification and design of the RF cavity will be presented. Low-power resonant cavity characterization measurements were used to benchmark the performance of the RF cavity. High-power characterization and measurements with electron beams will be used to validate the performance of the cavity in the electron storage ring. To fulfill the requirements for radiation effect experiments, the storage ring manipulation of beams that utilizes a phase space beam dilution method have been developed for the broadening of the radiation damped electron bunch with longitudinal particle distribution uniformity. The method relies on phase modulation applied to a double RF system to generate large regions of bounded chaotic particle motion in phase space. These region are formed by a multitude of overlapping parametric resonances. Parameters of the double RF system and applied phase modulation can be adjusted to vary the degree of beam dilution. The optimal RF parameters have been found for maximal bunch broadening, uniform longitudinal particle distribution, and bounded particle diffusion. Implementation of the phase space dilution method

  10. A new data acquisition system for Schottky signals in atomic physics experiments at GSI's and FAIR's storage rings

    Science.gov (United States)

    Trageser, C.; Brandau, C.; Kozhuharov, C.; Litvinov, Yu A.; Müller, A.; Nolden, F.; Sanjari, S.; Stöhlker, T.

    2015-11-01

    A new continuous and broadband data acquisition system for measurements of Schottky-signals of ions revolving in a storage ring has been implemented. This set-up is capable of recording the radio frequency (RF) signal of the ions that circulate in the storage ring with a sustained acquisition rate of more than 3.5× {10}7 IQ-samples per second. This allows several harmonics of the full momentum acceptance of a storage ring to be measured at the same time. The RF signal analyzer modules are complemented by further electronic modules such as counters, precision clocks and synchronization modules that facilitate a seamless integration with main experimental data acquisitions for atomic and nuclear physics. In this contribution, the setup and first results from a test run at the experimental storage ring at GSI, Darmstadt, Germany, are presented.

  11. Strong-field physics using lasers and relativistic heavy ions at the high-energy storage ring HESR at FAIR

    International Nuclear Information System (INIS)

    The HESR high-energy ion storage ring at FAIR will provide unprecedented possibilities for strong-field physics using novel laser sources on relativistic heavy ions. An overview on the planning will be given.

  12. The electron beam dynamics simulation in the laser-electron storage ring involving compton and intrabeam scattering

    CERN Document Server

    Gladkikh, P I; Karnaukhov, I M

    2002-01-01

    The feasibility of the development of intense X-ray sources based on Compton scattering in laser-electron storage rings is discussed. The results of the electron beam dynamics simulation involving Compton and intrabeam scattering are presented.

  13. Ion optics and beam dynamics optimization at the HESR storage ring for the SPARC experiments with highly charged heavy ions

    OpenAIRE

    Kovalenko, Oleksandr

    2015-01-01

    The High-Energy Storage Ring (HESR) is a part of an upcoming International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt [1]. A key part of a scientific program, along with antiproton physics, will be physics with highly-charged heavy ions. Phase-space cooled beams together with fixed internal target will provide an excellent environment for storage ring experiments at the HESR for the SPARC collaboration [2–4]. Until recently, however, the existing ion optical lattic...

  14. Present status of the NIJI-IV storage-ring free-electron lasers

    Energy Technology Data Exchange (ETDEWEB)

    Yamazaki, T.; Yamada, K.; Sei, N. [Electrotechnical Lab., Ibaraki (Japan)] [and others

    1995-12-31

    The tunable region of the free-electron-laser (FEL) wavelength with the NIJI-IV system is now 348{approximately}595 nm. After the lasing at 352 nm in 1994, the quality of the electron beam stored in the ring has been improved further, and the highest peak intensity of the laser obtained so far is more than 300 times as high as that of the resonated spontaneous emission. The macro-temporal structure of the lasing has been greatly improved. Recently, a single-bunch injection system was completed, and the system has been installed in the injector linac, which is expected to increase the peak stored-beam current. The commissioning and the test of the new system is under way. The beam transporting system from the linac to the ring is also being modified by increasing the number of quadrupole magnets. The experiments related to the FEL in the ultraviolet wavelength region will be begun in this coming May. The results and the status of the FEL experiments will be presented at the Conference.

  15. Properties of the electron cloud in a high-energy positron and electron storage ring

    International Nuclear Information System (INIS)

    Low-energy, background electrons are ubiquitous in high-energy particle accelerators. Under certain conditions, interactions between this electron cloud and the high-energy beam can give rise to numerous effects that can seriously degrade the accelerator performance. These effects range from vacuum degradation to collective beam instabilities and emittance blowup. Although electron-cloud effects were first observed two decades ago in a few proton storage rings, they have in recent years been widely observed and intensely studied in positron and proton rings. Electron-cloud diagnostics developed at the Advanced Photon Source enabled for the first time detailed, direct characterization of the electron-cloud properties in a positron and electron storage ring. From in situ measurements of the electron flux and energy distribution at the vacuum chamber wall, electron-cloud production mechanisms and details of the beam-cloud interaction can be inferred. A significant longitudinal variation of the electron cloud is also observed, due primarily to geometrical details of the vacuum chamber. Such experimental data can be used to provide realistic limits on key input parameters in modeling efforts, leading ultimately to greater confidence in predicting electron-cloud effects in future accelerators.

  16. Single-Particle Dynamics in Electron Storage Rings with Extremely Low Emittance

    Energy Technology Data Exchange (ETDEWEB)

    Cai, Yunhai; /SLAC

    2011-05-31

    Electron storage rings are widely used for high luminosity colliders, damping rings in high-energy linear colliders, and synchrotron light sources. They have become essential facilities to study high-energy physics and material and medical sciences. To further increase the luminosity of colliders or the brightness of synchrotron light sources, the beam emittance is being continually pushed downward, recently to the nanometer region. In the next decade, another order of reduction is expected. This requirement of ultra-low emittance presents many design challenges in beam dynamics, including better analysis of maps and improvement of dynamic apertures. To meet these challenges, we have refined transfer maps of common elements in storage rings and developed a new method to compute the resonance driving terms as they are built up along a beamline. The method is successfully applied to a design of PEP-X as a future light source with 100-pm emittance. As a result, we discovered many unexpected cancelations of the fourth-order resonance terms driven by sextupoles within an achromat.

  17. Studies of Metastable Levels in Singly Charged Ions by Laser Techniques in an Ion Storage Ring

    International Nuclear Information System (INIS)

    Experimental techniques have been developed at the ion storage ring CRYRING in Stockholm for measurements of lifetimes of metastable states. The methods are based on laser techniques and utilize the qualities of fast ion beam laser spectroscopy (FIBLAS). With these laser techniques we have been able to measure lifetimes in a range from 3 ms to 5 s. The lower limit is set by the injection time for ions into the ring, while the upper limit is related to the time for which ion storage could be achieved in the ring. One advantage of the present method is that collinear laser excitation gives high spectral resolution and consequently high selectivity Even hyperfine selective measurements are possible. By laser probing, the detection efficiency can be very high although the forbidden decay processes are extremely weak. The methods have been applied to the nd2DJ levels in Ca+ and Sr+ and have been shown to be competitive to ion trap measurements. More recently, measurements have been performed on metastable levels in Fe+ and in the rare earth elements Eu+ and La+. The latter measurements take advantage of the attractive properties of the technique and are the first experimental studies of forbidden decay rates in these elements. The techniques are described and results presented

  18. Aerodynamic, structural, and trajectory analysis of ASTRID-1 vehicle

    Energy Technology Data Exchange (ETDEWEB)

    Glover, L.S.; Iwaskiw, A.P.; Oursler, M.A.; Perini, L.L.; Schaefer, E.D.

    1994-02-10

    The Johns Hopkins University/Applied Physics Laboratory, JHU/API, in support of Lawrence Livermore National Laboratory, LLNL, is conducting aerodynamic, trajectory, and structural analysis of the Advanced Single Stage Technology Rapid Insertion Demonstration (ASTRID) vehicle, being launched out of Vandenberg Air Force Base (VAFB) in February 1994. The launch is designated ASTRID-1 and is the first in a series of three that will be launched out of VAFB. Launch dates for the next two flights have not been identified, but they are scheduled for the 1994-1995 time frame. The primary goal of the ASTRID-1 flight is to test the LLNL light weight thrust on demand bi-propellant pumped divert propulsion system. The system is employed as the main thrusters for the ASTRID-1 vehicle and uses hydrazine as the mono-propellant. The major conclusions are: (1) The vehicle is very stable throughout flight (stability margin = 17 to 24 inches); (2) The aerodynamic frequency and the roll rate are such that pitch-roll interactions will be small; (3) The high stability margin combined with the high launcher elevation angle makes the vehicle flight path highly sensitive to perturbations during the initial phase of flight, i.e., during the first second of flight after leaving the rail; (4) The major impact dispersions for the test flight are due to winds. The wind impact dispersions are 90% dictated by the low altitude, 0 to 1000 ft., wind conditions; and (5) In order to minimize wind dispersions, head wind conditions are favored for the launch as November VAFB mean tail winds result in land impacts. The ballistic wind methodology can be employed to assess the impact points of winds at the launch site.

  19. Status of ASTRID nuclear island pre-conceptual design

    International Nuclear Information System (INIS)

    Being part of the answer to the French Act of the 28th of June 2006 about nuclear materials and waste management, the ASTRID (Advanced Sodium Technological Reactor for Industrial Demonstration) Project has the objective to demonstrate, from 2020s, at the industrial scale progress on identified domains of Sodium-cooled Fast Reactor (safety, operability, economy) and to perform transmutation demonstrations. CEA (French Commission for Atomic Energy and Alternative Energy) is the leader of the ASTRID project, with support of industrial partnerships to cover main engineering design works. The pre-conceptual design is the first important milestone, with preliminary investment cost evaluation. In this phase, innovation and technological breakthroughs are favoured, while maintaining risk at an acceptable level. The pre-conceptual design, started in 2010, will be delivered by the end of 2012, and will consider some open options. This paper presents a status of the ASTRID nuclear island pre-conceptual design. The most promising options are highlighted as well as the less risky and back-up options. Each option is evaluated in terms of economy, safety, In Service Inspection and Repair (ISIR), operability, robustness, and project risk. Items addressed in the paper include Above Core Structure, Intermediate Heat Exchanger, primary and secondary pumps, Decay Heat Removal systems, core catcher. Also included are the options for Steam Generators or sodium-gas heat exchanger, as well as global architecture in connexion with the selection of Power Conversion System. (author)

  20. Rapport : Astrid Lindgrens arkiv – nya forskningsmöjligheter

    Directory of Open Access Journals (Sweden)

    Törnqvist, Lena

    2011-01-01

    Full Text Available Astrid Lindgren’s archives in the National Library of Sweden, Manuscript Dept (L 230, are probably the most extensive any individual Swede has left behind. After some ten years of cataloguing, the archives are now open for research. The archives consist of some 75 000 letters to the author from readers, colleagues, publishers, translators, film and theatre producers, children and many others all over the world; a thousand copies of letters written by her; 600 manuscripts to books, plays, films and essays; 100 000 newspaper clippings, royalties, photos, shorthand notes etc. etc., in all more than 140 shelf metres of documents (see www.ediffah.org and search ”Astrid Lindgrens arkiv” for a list of contents. Short hand notes and correspondence require special permission from Astrid Lindgren’s estate, www.saltkrakan.se; info@saltkrakan.se. The material in the archives should be of interest not only for researches of juvenile literature but also research into art and language education, film and drama, sociology, economics, translation and many other subjects and open up new fields of research on the author’s work. The archives also mirror the fact that Lindgren played an important role in public debate on different subjects such as child care and child abuse, nuclear power and the treatment of farm animals. The archives were included in the UNESCO Memory of the World Register in 2005

  1. First-turn losses in the LAMPF Proton Storage Ring (PSR)

    International Nuclear Information System (INIS)

    Beam-loss measurements protons injected into the PSR are lost during the first turn. We describe a plausible mechanism, involving field stripping of excited hydrogen atoms, for these losses. Protons are injected into the PSR by transporting a neutral hydrogen beam through a hole in the yoke of one ring bender and then through a carbon foil on the ring axis. The foil strips roughly 93% of the beam atoms to protons. Although the original PSR design assumed that all unstripped atoms would pass through a hole in the yoke of the next downstream bender and on to a beam stop, recent calculations indicate that about 6% of these unstripped atoms will emerge from the foil in an excited state with principle quantum number n≥23. These calculations also indicate that atoms in excited states with n≥3 will be stripped quickly to protons in the 1.2-Tesla field of the downstream bender. The trajectories of these protons will be outside the phase-space acceptance of the ring and will be quickly lost by collision with the beam pipe, thereby giving rise to first-turn losses. The estimated numbers of protons that would be lost by this mechanism are consistent with the observed first-turn loss rates. This mechanism has important consequences for the design of future storage rings that use neutral atom or negative ion stripping for injection

  2. RF linac and storage ring - perspectives of heavy ion fusion studies at GSI

    International Nuclear Information System (INIS)

    After many years of theoretical studies of the rf linac/storage ring scenario, we are now at GSI close to the completion of a two-ring accelerator complex, which will allow unique contributions to the development of HIF owing to its high operational flexibility. The availability of a high-current injector, together with charge stripping and beam cooling allows to simulate by experiment nearly all crucial questions that can be raised for a full-scale driver accelerator based on conventional technology. The high intensity development of SIS/ESR will be beneficial to target experiments in the range of a few kilojoule beam energy. From theoretical estimates with electron-cooled Xe beams we predict temperatures in solid gold of 20 eV average or 50 eV at the end of range. After this goal has been reached, plans for future development into the range of temperatures exceeding 100 eV (when radiation effects become significant) could go along of temperatures exceeding 100 eV (when radiation effects become significant) could go along one of the following directions: A more conventional approach that requires a stack of 6 additional rings in a common tunnel of 10 m radius; or only one such additional ring but with non-Liouvillian pulse stacking through a stripping foil. Problems to be studied in the future are briefly outlined. (orig.)

  3. Rf linac and storage ring - perspectives of heavy-ion fusion studies at GSI

    International Nuclear Information System (INIS)

    After many years of theoretical studies of the rf-linac/storage-ring scenario, we at GSI are now close to the completion of a two-ring accelerator complex, which will allow unique contributions to the development of HIF owing to its high operational flexibility. The availability of a high-current injector, together with charge stripping and beam cooling, allows to simulate by experiment nearly all crucial questions that can be raised for a full-scale driver accelerator based on conventional technology. The high-intensity development of SIS/ESR will be beneficial to target experiments in the range of a few kJ beam energy. From theoretical estimates with electron-cooled Xe beams we predict temperatures in solid gold of 20 eV average or 50 eV at the end of range. After this goal has been reached, plans for future development into the range of temperatures exceeding 100 eV (when radiation effects become significant) could go along one of the following directions: a more conventional approach that requires a stack of six additional rings in a common tunnel of 10 m radius; or only one such additional ring but with non-Liouvillian pulse stacking through a stripping foil. Problems to be studied in the future are briefly outlined. (orig.)

  4. Integrating Log-Ratio position processing for the Los Alamos Proton Storage Ring extraction line

    International Nuclear Information System (INIS)

    The Los Alamos Proton Storage Ring (PSR) compressor ring intended to accept 1-msec-long p macropulses from the LAMPF linear accelerator and compress these pulses to 250 nsec in length. Beam position monitor sensors of the terminated strip-line design centered at 200 nsec are provided in the transport line from LAMPF, the PSR injection line, the PSR ring, and the extracted beam line. Strip-line sensors used in conjunction with phase processing are a good match for linac transport lines and PSR injection lines where there exists a strong 200-MHz frequency component but lead to difficulties in the ring and extracted beam line where this component tends to wash out. This paper describes the development of Integrating Log-Ratio processing techniques, which utilize the original strip line sensors to achieve a major improvement in position monitoring for the extracted beam line. The design concepts are discussed and the present hardware is described in detail. Operational difficulties encountered during the development process are discussed and actual beam-related results are provided

  5. Mechanical Properties of Cladding and Wrapper Materials for the ASTRID Fast-Reactor Project

    International Nuclear Information System (INIS)

    In the ASTRID fast-reactor project, the AIM1 (Austenitic Improved Material) is the reference material for fuel cladding. AIM1 is the result of optimization studies performed at CEA on titanium-stabilized austenitic alloys to minimize irradiation swelling and preserve good mechanical properties during reactor lifetime. For the wrapper, the choice has been made to use a 9Cr martensitic steel (EM10), which has been extensively characterized in Phenix. This type of steel offers an excellent resistance to irradiation induced void swelling and keeps a sufficient level of ductility after irradiation. The first part of this paper gives an overview of fresh and irradiated AIM1 properties. A special emphasis is given to recent experimental data: • New metrologies to determine cladding strain were performed on fuel pin irradiated in the PHENIX reactor at high dose : 130 dpa, • Axial and ring tensile tests were also done at room temperature and irradiation temperature (400°C < T < 700°C). This complements older high-temperatures tests simulating transients conditions (700°C < T < 1200°C). The recent work on AIM1 modeling is also described. Swelling and irradiation creep models were updated to include the latest measurements at higher dose. New mechanical models were developed to describe tensile and thermal creep properties. In the second part, an overview of the mechanical properties obtained on irradiated EM10 material is given, with tensile tests and impact toughness results for doses over 100 dpa, and remaining topics for ongoing research are discussed. The paper will conclude on the future work that remains to be done to achieve a satisfactory qualification of AIM1 and EM10 before the ASTRID startup. (author)

  6. Up gradation of control system for RF subsystems of booster synchrotron and Indus-1 storage ring

    International Nuclear Information System (INIS)

    Indus-1 is a 450 MeV Synchronous radiation source at Raja Ramanna Center for Advanced Technology Indore. Booster Synchrotron was commissioned in 1995 and Indus-1 storage ring in 1999. Presently 6 beam lines are being used in round the clock mode, which are commissioned over the period. Indus-1 is comprises of many subsystems like Radio Frequency, Magnet Power Supplies, Pulsed Power Supplies, Vacuum System, Radiation Monitoring system and Low Conductive Water cooling system. All subsystems are connected to main control room by dedicated control systems. These control systems are Versa Module Europa bus (VMEbus) based systems and being operated since commissioning of Booster and Indus-l rings. This paper high lights the new features of developed hardware for Control System of Indus-1 RF

  7. Reinforcement of the high-power RF source at the Photon Factory storage ring

    International Nuclear Information System (INIS)

    Four single-cell cavities are used for beam acceleration in the Photon Factory storage ring. An RF power was supplied by two 180-kW klystrons until July, 1988. The maximum stored current of the ring was 370 mA, limited by the available RF-power. In order to store more high-current beams, the RF-power source was reinforced by an addition of two klystrons in 1988. Hence, each cavity is driven by a single klystron. Related devices such as a high-voltage power supply for the klystron, a circulator, waveguides and low-level RF circuits were newly installed. The reinforcement allowed us to achieve a stored current of 500 mA at 2.5 GeV. (author)

  8. A Bragg-Fresnel multilayer electron beam monitor for third generation storage rings

    International Nuclear Information System (INIS)

    In anticipation of the small emittance of the third generation light source, BESSY II, we have developed a new approach to beam diagnostics based on the use of Bragg-Fresnel multilayer (BFM) optical components which will be able to withstand the high heat load expected. We report here on the successful performance of such a system as tested on a BESSY I dipole source. Because BESSY II will provide significantly smaller electron beam dimensions than BESSY I, the system was designed for operation at 6.53 nm (190 eV), well below the diffraction limit of BESSY II. The optical system, designed with a reflecting lens and plane mirror, provides 1 : 0.8 image transfer with a spatial resolution of similar 7 μm. The source shape for different ring currents and operation modes of the storage ring has been measured and is represented here. (orig.)

  9. High-Current Effects in the PEP-II Storage Ring

    International Nuclear Information System (INIS)

    The PEP-II B-Factory operated at peak and integrated luminosity several times the original design values. Its storage rings operated at world-record beam currents with bunch lengths of about 10 mm. Correspondingly significant heat load was imposed on the vacuum system, both due to synchrotron radiation and by energy loss into higher-order modes. The latter in turn would lead to local heating or discharges wherever such energy got absorbed. Over the course of PEP-II running we experienced numerous such effects, which lead to upgrade programs of significant scope. In the following we will describe the most significant of such effects and their mitigation: (1) Upgrades and repairs of RF seals and shields in both rings; (2) Redesign of overheating stripline kicker electrodes to withstand higher powers; and (3) Redesign and replacement of BPM buttons following failure.

  10. Report of the design study on a high brilliance configuration of the PF storage ring

    International Nuclear Information System (INIS)

    The 2.5 GeV Photon Factory storage ring has been steadily improved by decade-long research and development. Its performance, especially the stored current, beam lifetime and beam stability, has been achieved to the world highest level. As one of our recent activities, a high brilliance configuration was proposed. In the new configuration, the focussing magnet of the normal cells will be reinforced. Every light source position and direction of beamline will not be changed since all bending magnets keep their present locations. The beam emittance will be reduced to 27 nmrad which is one fifth of the present value (130 nmrad). The brilliance will be increased typically by a factor of 10. In this report, we describe the high brilliance ring configuration as well as the procedure and time schedule in the possible reconstruction. (author)

  11. Beam injection and accumulation method in storage rings for heavy ion fusion

    International Nuclear Information System (INIS)

    A combination of multiturn injection and rf stacking is proposed as an efficient beam injection method in storage rings for heavy ion fusion. Five turn injection in each transverse phase space and four rf stackings give a total of 100 stacking turns. This represents a compromise between the tolerable emittances and momentum spread in the ring. Space charge limitations and coherent beam instabilities are investigated. The most severe limit is found to be the transverse coherent instability, but this can be controlled by the use of sextupole and octupole magnetic fields. Assuming a charge exchange cross section of 1 x 10-15 cm2, the e-folding life time is estimated at 180 ms, while the stacking time is 40 ms

  12. Beam life time studies and design optimization of the Ultra-low energy Storage Ring

    Science.gov (United States)

    Welsch, C. P.; Papash, A. I.; Harasimowicz, J.; Karamyshev, O.; Karamysheva, G. A.; Newton, D.; Panniello, M.; Putignano, M.; Siggel-King, M. R. F.; Smirnov, A.

    2014-04-01

    The Ultra-low energy electrostatic Storage Ring (USR) at the future Facility for Low-energy Antiproton and Ion Research (FLAIR) will provide cooled beams of antiprotons in the energy range between 300 keV down to 20 keV. Based on the original design concept developed in 2005, the USR has been completely redesigned over the past few years by the QUASAR Group. The ring structure is now based on a 'split achromat' lattice. This ensures compact ring dimensions of 10 m × 10 m, whilst allowing both, in-ring experiments with gas jet targets and studies with extracted beams. In the USR, a wide range of beam parameters shall be provided, ranging from very short pulses in the nanosecond regime to a coasting beam. In addition, a combined fast and slow extraction scheme will be featured that allows for providing external experiments with cooled beams of different time structure. Detailed investigations into the dynamics of low energy beams, including studies into the long term beam dynamics and ion kinetics, beam life time, equilibrium momentum spread and equilibrium lateral spread during collisions with an internal target were carried out. This required the development of new simulation tools to further the understanding of beam storage with electrostatic fields. In addition, studies into beam diagnostics methods for the monitoring of ultra-low energy ions at beam intensities less than 10 6 were carried out. This includes instrumentation for the early commissioning of the machine, as well as for later operation with antiprotons. In this paper, on overview of the technical design of the USR is given with emphasis on two of the most important operating modes, long term beam dynamics and the design of the beam diagnostics system.

  13. THE POTENTIAL FOR NEUTRINO PHYSICS AT MUON COLLIDERS AND DEDICATED HIGH CURRENT MUON STORAGE RINGS

    International Nuclear Information System (INIS)

    Conceptual design studies are underway for both muon colliders and high-current non-colliding muon storage rings that have the potential to become the first true neutrino factories. Muon decays in long straight sections of the storage rings would produce uniquely intense and precisely characterized two-component neutrino beams--muon neutrinos plus electron antineutrinos from negative muon decays and electron neutrinos plus muon antineutrinos from positive muons. This article presents a long-term overview of the prospects for these facilities to greatly extend the capabilities for accelerator-based neutrino physics studies for both high rate and long baseline neutrino experiments. As the first major physics topic, recent experimental results involving neutrino oscillations have motivated a vigorous design effort towards dedicated neutrino factories that would store muon beams of energies 50 GeV or below. These facilities hold the promise of neutrino oscillation experiments with baselines up to intercontinental distances and utilizing well understood beams that contain, for the first time, a substantial component of multi-GeV electron-flavored neutrinos. In deference to the active and fast-moving nature of neutrino oscillation studies, the discussion of long baseline physics at neutrino factories has been limited to a concise general overview of the relevant theory, detector technologies, beam properties, experimental goals and potential physics capabilities. The remainder of the article is devoted to the complementary high rate neutrino experiments that would study neutrino-nucleon and neutrino-electron scattering and would be performed at high performance detectors placed as close as is practical to the neutrino production straight section of muon storage rings in order to exploit beams with transverse dimensions as small as a few tens of centimeters

  14. Compensation of the linear effect of insertion devices for the storage ring INDUS-2

    International Nuclear Information System (INIS)

    A method to correct the distortion of betatron functions and linear tunes caused by insertion devices is discussed. In this method the strengths of several quadrupole magnets are varied such that the tunes are fully corrected and distortions of betatron functions are minimised. Based on this method a computer code name BURHANI has ben developed and used for simulating the effect of wigglers and undulators in the storage ring INDUS-2, a 2.5 GeV synchrotron radiation source, under construction at the Centre for Advanced Technology. The results of the simulation studies for INDUS-2 are presented

  15. Proposal of a relationship between dynamic aperture adn intensity evolution in a storage ring

    CERN Document Server

    Giovannozzi, M

    2010-01-01

    A scaling law for the time-dependence of the dynamic aperture, i.e., the region of phase space where stable motion occurs, was proposed in previous papers, about ten years ago. The use of fundamental theorems of the theory of dynamical systems allowed showing that the dynamic aperture has a logarithmic dependence on time. In this paper this result, proved by mean of numerical simulations, is used as a basis for deriving a scaling law for the intensity evolution in a storage ring. The proposed scaling law is also tested against experimental data showing a remarkable agreement.

  16. Behaviour of space-charge dominated ion beams in storage rings

    International Nuclear Information System (INIS)

    The interparticle repulsion, or space charge, limits the density of charged particle beams that can be obtained in storage rings. In this report we study the effect of increasing the space charge, with an exact computation of the lattice parameters using SYNCH. Systematically increasing the ion density by decreasing the emittance with cooling techniques lowers the betatron tune, until the lower half-integral stopband resonance -- also induced by the beam is reached. In the simple model described in the report, the amount of ''cooling'' is limited by the encountered stopband of the lattice. Therefore, machines with a higher tune and larger periodicity are better suited to store beams with high space charge

  17. Magnetic measurement system for cooling storage ring of heavy ion research facility in Lanzhou

    International Nuclear Information System (INIS)

    Magnetic measurement system is an indispensable part of National Scientific Major-project Cooling Storage Ring of Heavy Ion Research Facility in Lanzhou (HIRFL-CSR). Three measurement systems, Hall probe mapping, integral coils and harmonic coils system were developed. The structure and parameters of main devices were described in details in the paper. And the manufacturing technics and the checking results were also involved. By means of a long time repeat testing, it is proved that the repeatability and stability of the systems match the requirements of CSR. The systems are applying in CSR project now. (author)

  18. Electric field detection of coherent synchrotron radiation in a storage ring generated using laser bunch slicing

    International Nuclear Information System (INIS)

    The electric field of coherent synchrotron radiation (CSR) generated by laser bunch slicing in a storage ring has been detected by an electro-optic sampling method. The gate pulses for sampling are sent through a large-mode-area photonic-crystal fiber. The observed electric field profile of the CSR is in good agreement with the spectrum of the CSR observed using Fourier transform far-infrared spectrometry, indicating good phase stability in the CSR. The longitudinal density profiles of electrons modulated by laser pulses were evaluated from the electric field profile.

  19. The gamma ray energy tagging spectrometer of ROKK-2 facility at VEPP-3 storage ring

    International Nuclear Information System (INIS)

    The gamma ray energy tagging spectrometer is described. The storage ring bending magnet was used as an analyzer for the gamma ray tagging spectrometer in the photon energy range from 1.5% up to 14% of the initial beam energy with the drift chambers as a coordinate detector. Factors determine the registration efficiency and the energy resolution of the tagging spectrometer are discussed. The tagging spectrometer energy resolution is measured by using the width of high energy edge of the Compton spectrum. The registration efficiency value consists 95% and the photon energy resolution is 4 MeV. 12 refs.; 10 figs

  20. Electric field detection of coherent synchrotron radiation in a storage ring generated using laser bunch slicing

    Science.gov (United States)

    Katayama, I.; Shimosato, H.; Bito, M.; Furusawa, K.; Adachi, M.; Shimada, M.; Zen, H.; Kimura, S.; Yamamoto, N.; Hosaka, M.; Katoh, M.; Ashida, M.

    2012-03-01

    The electric field of coherent synchrotron radiation (CSR) generated by laser bunch slicing in a storage ring has been detected by an electro-optic sampling method. The gate pulses for sampling are sent through a large-mode-area photonic-crystal fiber. The observed electric field profile of the CSR is in good agreement with the spectrum of the CSR observed using Fourier transform far-infrared spectrometry, indicating good phase stability in the CSR. The longitudinal density profiles of electrons modulated by laser pulses were evaluated from the electric field profile.

  1. Second order effects of a sextupolar field on betatron oscillations in a storage ring

    International Nuclear Information System (INIS)

    Calculations concerning the betatron oscillations in a storage ring lattice comprising a lumped element sextupole field are presented. The method used is based on the second order approximation of the averaging method. The existence of singular points inside the region of the phase space defined by the separatrix is assumed. Formula are given permitting the calculations of the size of the corresponding intersecting invariant curves and a simple expression is deduced for the betatron tune shift. Numerical application is made, the results are compared to those obtained by a tracking program. A good agreement between them is noticed

  2. Storage ring free electron laser, pulse propagation effects and microwave type instabilities

    International Nuclear Information System (INIS)

    It has been developed a dynamical model accounting for the storage Ring Free Electron Laser evolution including pulse propagation effects and e-beam instabilities of microwave type. It has been analyzed the general conditions under which the on set of the laser may switch off the instability and focus everybody attention on the interplay between cavity mismatch, laser pulsed behavior and e-beam instability dynamics. Particular attention is also devoted to the laser operation in near threshold conditions, namely at an intracavity level just enough to counteract the instability, that show in this region new and interesting effects arises

  3. Transverse vibrations of electron beam and ground motion measurements at VEPP-3 storage ring

    International Nuclear Information System (INIS)

    This paper is devoted to measurements of electron beam vibration at VEPP-3 storage ring. We measured simultaneously the beam vertical position by synchrotron radiation monitor, floor and magnetic quadrupole lens vibrations. The analysis of spectra of power and correlations points on strong connection of mechanical vibrations of lenses and beam movement at frequencies below 40 Hz and on definite influence of current supply fluctuations in the frequency range above hundred Hz. These results could be applied for design of various accelerator facilities such as SR sources, B-factories and large future colliders. 4 refs.; 8 figs

  4. Observation of broadband self-amplified spontaneous coherent terahertz synchrotron radiation in a storage ring

    International Nuclear Information System (INIS)

    Bursts of coherent synchrotron radiation at far-infrared and millimeter wavelengths have been observed at several storage rings. A microbunching instability has been proposed as the source for the bursts. However,the microbunching mechanism has yet to be elucidated. We provide the first evidence that the bursts are due to a microbunching instability driven by the emission of synchrotron radiation in the bunch. Observations made at the Advanced Light Source are consistent with the values predicted by a model for the microbunching proposed by Heifets and Stupakov. These results demonstrate a new instability regime for high energy synchrotron radiation sources and will impact the design of future sources

  5. Addenda to General Spin Precession and Betatron Oscillation in Storage Ring

    CERN Document Server

    Fukuyama, Takeshi

    2016-01-01

    We give the geralized expression of spin precession of extended bunch particles having both anomalous magnetic and electric dipole moments in storage ring in higher order than the previous work and in the presence of ${\\bf E}$ field as well as ${\\bf B}$ field. These addenda are essential since some experiments consider the focusing field in the second order of the beam extent and in the presence of both ${\\bf B}$ and ${\\bf E}$ fields . It is shown that some focusing fields with constant magnitude of the velocity considered in many literatures lead to the violation of self consistency.

  6. Commissioning and Early Operation Experience of the NSLS-II Storage Ring RF System

    Energy Technology Data Exchange (ETDEWEB)

    Gao, F.; Rose, J.; Cupolo, J.; Dilgen, T.; Rose, B.; Gash, W.; Ravindranath, V.; Yeddulla, M.; Papu, J.; Davila, P.; Holub, B.; Tagger, J.; Sikora, R.; Ramirez, G.; Kulpin, J.

    2015-05-03

    The National Synchrotron Light Source II (NSLS-II) is a 3 GeV electron X-ray user facility commissioned in 2014. The storage ring RF system, essential for replenishing energy loss per turn of the electrons, consists of digital low level RF controllers, 310 kW CW klystron transmitters, CESR-B type superconducting cavities, as well as a supporting cryogenic system. Here we will report on RF commissioning and early operation experience of the system for beam current up to 200mA.

  7. Proposal to detect an emission of unusual super-high energy electrons in electron storage rings

    Directory of Open Access Journals (Sweden)

    Da-peng Qian

    2014-01-01

    Full Text Available According to an extended Lorentz–Einstein mass formula taken into the uncertainty principle, it is predicted that the electron beams passing accelerating electric field should with a small probability generate abnormal super-high energy electrons which are much higher than the beam energy. Author’s preliminary experiment result at electron storage ring has hinted these signs, so suggests to more strictly detect this unusual phenomenon, and thus to test the extended mass formula as well as a more perfect special relativity.

  8. Towards an RF Wien-Filter for EDM Searches in Storage Rings

    OpenAIRE

    Mey, Sebastian; Gebel, Ralf

    2015-01-01

    The JEDI Collaboration (Jülich Electric Dipole Moment (EDM) Investigations) is developing tools for the measurement of permanent EDMs of charged, light hadrons in storage rings. While the StandardModel prediction for the EDM gives unobservably small magnitudes, a non-vanishing EDM can lead to a tiny build-up of vertical polarization in a beforehand horizontally polarized beam. This requires a spin tune modulation by an RF Wien-Filter. In the course of 2014, a prototype RF ExB-Dipole has been ...

  9. Development of RF-linac and storage ring system for high-current experiments at GSI

    International Nuclear Information System (INIS)

    The heavy ion facility under construction at GSI is suitable for the generation of high-current beams. It consists of a new high-current injector into the Unilac and a synchrotron and storage ring. We discuss the capability of this system to produce short pulses of heavy ions with a specific energy of the order of 0.1 MJ/g. Under these conditions the system allows to perform a first generation of heavy ion driven target experiments and to test most of the critical issues of a large scale heavy ion fusion driver facility. (orig.)

  10. Safe operating conditions for NSLS-II Storage Ring Frontends commissioning

    Energy Technology Data Exchange (ETDEWEB)

    Seletskiy, S. [Brookhaven National Lab. (BNL), Upton, NY (United States); Amundsen, C. [Brookhaven National Lab. (BNL), Upton, NY (United States); Ha, K. [Brookhaven National Lab. (BNL), Upton, NY (United States); Hussein, A. [Brookhaven National Lab. (BNL), Upton, NY (United States)

    2015-04-02

    The NSLS-II Storage Ring Frontends are designed to safely accept the synchrotron radiation fan produced by respective insertion device when the electron beam orbit through the ID is locked inside the predefined Active Interlock Envelope. The Active Interlock is getting enabled at a particular beam current known as AI safe current limit. Below such current the beam orbit can be anywhere within the limits of the SR beam acceptance. During the FE commissioning the beam orbit is getting intentionally disturbed in the particular ID. In this paper we explore safe operating conditions for the Frontends commissioning.

  11. Pion interferometry in jet events at the CERN intersecting storage rings

    International Nuclear Information System (INIS)

    We have observed an enhanced production of pairs and triplets of identical charged particles at small momentum differences in events with two central jets produced in pp collisions at the CERN intersecting storage rings. The size and structure of this 'Bose-Einstein' enhancement, shown by the particles within a jet, resembles that observed in minimum-bias events. The correlation function can be well parametrized by the single variable Q - the absolute value of the four-momentum transfer - and is more peaked than a single Gaussian. (orig.)

  12. Experimental investigation of high voltage nanosecond generators of injection system for SIBERIA-2 storage ring

    International Nuclear Information System (INIS)

    The injection system for SIBERIA-2 storage ring (Kurchatov Institute, Moscow) has been put into commissioning. The high voltage impulse generators with double coaxial forming lines and three electrode nitrogen filled spark gaps are intended for linac electron gun and fast full-aperture kickers supply. The output impulses are up to 60 kV in amplitude, 15-20 ns in duration with front about 3 ns. A root-mean-square dispersion of time delays of gaps is 0.7-0.8 ns. The experimental results of operation of the generators are presented

  13. Studies of closed orbit correction and slow orbit feedback for the SSRF storage ring

    Institute of Scientific and Technical Information of China (English)

    HOU Jie; TIAN Shun-Qiang; ZHANG Man-Zhou; XU Yi; LIU Gui-Min

    2009-01-01

    Details of the active ways to suppress Closed Orbit Distortion (COD), including bending magnet sorting and survey and alignment of the magnets, are discussed based on the studies of affections to the COD by the bending magnet field error and the misalignment of quadrupoles. The closed orbit correction and the Slow Orbit Feed Back (SOFB) system for the SSRF storage ring are presented in this paper. With these available methods, better results were obtained during the commissioning period with 3 GeV beam energy.

  14. Proceedings of the 5th meeting on ultra high vacuum techniques for accelerators and storage rings

    International Nuclear Information System (INIS)

    This is the proceedings of the 5th meeting on UHV Techniques for Accelerators and Storage Rings held at KEK, March 26-27, 1984. More than 110 vacuum scientists attended the meeting, and 23 reports were presented. Main subjects were, of course, concerning with the vacuum systems for large accelerators and plasma devices under planning or construction in Japan. At the same time, many reports on the general problems of vacumm science were also presented. The subjects of these reports were outgassing phenomenon, surface problems, new type UHV pumps and others. (author)

  15. Recent Results and Progress on Leptonic and Storage Ring EDM Searches

    Science.gov (United States)

    Kawall, David

    2016-02-01

    The Standard Model is incomplete and unable to explain the matter-antimatter asymmetry in the universe. Many extensions of the Standard Model predict new particles and interactions with additional CP-violating phases that can explain this imbalance. Electric dipole moments (EDMs) of fundamental particles, which are generated by CP-violating interactions, can be enhanced by many orders of magnitude by contributions from this new physics to a magnitude within reach of current and planned experiments. New approaches to EDM searches using storage rings, and their sensitivity to new physics are presented.

  16. Observation and analysis of time-dependent closed orbit motion in the LAMPF Proton Storage Ring

    International Nuclear Information System (INIS)

    When the stored beam is artificially offset in a section of the LAMPF Proton Storage Ring by changing selected ring dipole strengths, there is evidence for a small time dependence of the offset during the course of beam injection. A complete discussion of the time dependence of orbit offsets should take into account at least the following possibilities: (1) correlations between the injection timing pattern and ring dipole field ripple, (2) correlations between the injection timing pattern and changes of beam position monitor characteristics, and (3) growth of space-charge effects as the number of stored protons increases. Since there is no a priori reason to expect the correlations mentioned, we have analyzed the observed time dependence of the beam offset in terms of space-charge effects only, although the other possible causes cannot be ruled out. The buildup of circulating charge during proton injection leads to a shift of the betatron tune of individual protons because of space-charge forces; this shift can cause a change of the individual proton closed-orbit positions, and consequently a change in the position of the beam as a whole. At the end of a PSR injection cycle there are approximately 2.5 x 1013 protons stored in the ring. The observed time dependence of the beam offset indicates a horizontal-plane tune shift of -0.03 ± 0.02; this is consistent with a theoretical estimate of a maximum expected space-charge tune shift of -0.09 when 2.5 x 1013 protons are stored in the ring. 3 refs., 4 figs

  17. The HERMES Polarized Hydrogen and Deuterium Gas Target in the HERA Electron Storage Ring

    CERN Document Server

    Airapetian, A; Akopov, Z; Amarian, M; Ammosov, V V; Andrus, A; Aschenauer, E C; Augustyniak, W; Avakian, R; Avetisian, A; Avetissian, E; Bailey, P; Baturin, V; Baumgarten, C; Beckmann, M; Belostotskii, S; Bernreuther, S; Bianchi, N; Blok, H P; Böttcher, Helmut B; Borisov, A; Bouwhuis, M; Brack, J; Brüll, A; Bryzgalov, V V; Capitani, G P; Chiang, H C; Ciullo, G; Contalbrigo, M; Dalpiaz, P F; De Leo, R; De Nardo, L; De Sanctis, E; Devitsin, E G; Di Nezza, P; Düren, M; Ehrenfried, M; Elalaoui-Moulay, A; Elbakian, G M; Ellinghaus, F; Elschenbroich, U; Ely, J; Fabbri, R; Fantoni, A; Feshchenko, A; Felawka, L; Fox, B; Franz, J; Frullani, S; Gärber, Y; Gapienko, G; Gapienko, V; Garibaldi, F; Garrow, K; Garutti, E; Gaskell, D; Gavrilov, G E; Karibian, V; Graw, G; Grebenyuk, O; Greeniaus, L G; Hafidi, K; Hartig, M; Hasch, D; Heesbeen, D; Henoch, M; Hertenberger, R; Hesselink, W H A; Hillenbrand, A; Hoek, M; Holler, Y; Hommez, B; Iarygin, G; Ivanilov, A; Izotov, A; Jackson, H E; Jgoun, A; Kaiser, R; Kinney, E; Kiselev, A; Königsmann, K C; Kopytin, M; Korotkov, V A; Kozlov, V; Krauss, B; Krivokhizhin, V G; Lagamba, L; Lapikas, L; Laziev, A; Lenisa, P; Liebing, P; Lindemann, T; Lipka, K; Lorenzon, W; Lü, J; Maiheu, B; Makins, N C R; Marianski, B; Marukyan, H O; Masoli, F; Mexner, V; Meyners, N; Miklukho, O; Miller, C A; Miyachi, Y; Muccifora, V; Nagaitsev, A; Nappi, E; Naryshkin, Yu; Nass, A; Negodaev, M A; Nowak, Wolf-Dieter; Oganessyan, K; Ohsuga, H; Orlandi, G; Pickert, N; Potashov, S Yu; Potterveld, D H; Raithel, M; Reggiani, D; Reimer, P E; Reischl, A; Reolon, A R; Riedl, C; Rith, K; Rosner, G; Rostomyan, A; Rubacek, L; Ryckbosch, D; Salomatin, Yu I; Sanjiev, I; Savin, I; Scarlett, C; Schäfer, A; Schill, C; Schnell, G; Schüler, K P; Schwind, A; Seele, J; Seidl, R; Seitz, B; Shanidze, R G; Shearer, C; Shibata, T A; Shutov, V B; Simani, M C; Sinram, K; Stancari, M D; Statera, M; Steffens, E; Steijger, J J M; Stewart, J; Stösslein, U; Tait, P; Tanaka, H; Taroian, S P; Tchuiko, B; Terkulov, A R; Tkabladze, A V; Trzcinski, A; Tytgat, M; Vandenbroucke, A; Van der Nat, P B; van der Steenhoven, G; Vetterli, Martin C; Vikhrov, V; Vincter, M G; Visser, J; Vogel, C; Vogt, M; Volmer, J; Weiskopf, C; Wendland, J; Wilbert, J; Ybeles-Smit, G V; Yen, S; Zihlmann, B; Zohrabyan, H G; Zupranski, P

    2004-01-01

    The HERMES hydrogen and deuterium nuclear-polarized gas targets have been in use since 1996 with the polarized electron beam of HERA at DESY to study the spin structure of the nucleon. Polarized atoms from a Stern-Gerlach Atomic Beam Source are injected into a storage cell internal to the HERA electron ring. Atoms diffusing from the center of the storage cell into a side tube are analyzed to determine the atomic fraction and the atomic polarizations. The atoms have a nuclear polarization, the axis of which is defined by an external magnetic holding field. The holding field was longitudinal during 1996-2000, and was changed to transverse in 2001. The design of the target is described, the method for analyzing the target polarization is outlined, and the performance of the target in the various running periods is presented.

  18. Development of a hydrogen and deuterium polarized gas target for application in storage rings

    International Nuclear Information System (INIS)

    Polarized gas targets of atomic hydrogen and deuterium have significant advantages over conventional polarized targets, e.g. chemical and isotopic purity, large polarization including deuteron tensor polarization, absence of strong magnetic fields, rapid polarization reversal. While in principle the beam of polarized atoms from an atomic beam source (Stern-Gerlach spin separation) can be used as a polarized target, the target thickness achieved is too small for most applications. We propose to increase the target thickness by injecting the polarized atoms into a storage cell. Provided the atoms survive several hundred wall collisions without losing their polarization, it will be possible to achieve a target thickness of 1013 to 1014 atoms/cm2 by injection of polarized atoms from an atomic-beam source into suitable cells. Such targets are very attractive as internal targets in storage rings

  19. The Conversion and operation of the Cornell electron storage ring as a test accelerator (CESRTA) for damping rings research and development

    International Nuclear Information System (INIS)

    In March of 2008, the Cornell Electron Storage Ring (CESR) concluded twenty eight years of colliding beam operations for the CLEO high energy physics experiment. We have reconfigured CESR as an ultra low emittance damping ring for use as a test accelerator (CesrTA) for International Linear Collider (ILC) damping ring R and D. The primary goals of the CesrTA program are to achieve a beam emittance approaching that of the ILC Damping Rings with a positron beam, to investigate the interaction of the electron cloud with both low emittance positron and electron beams, to explore methods to suppress the electron cloud, and to develop suitable advanced instrumentation required for these experimental studies (in particular a fast x-ray beam size monitor capable of single pass measurements of individual bunches). We report on progress with the CESR conversion activities, the status and schedule for the experimental program, and the first experimental results that have been obtained.

  20. Gas bremsstrahlung studies for medium energy electron storage rings using FLUKA Monte Carlo code

    Science.gov (United States)

    Sahani, Prasanta Kumar; Haridas, G.; Sinha, Anil K.; Hannurkar, P. R.

    2016-02-01

    Gas bremsstrahlung is generated due to the interaction of the stored electron beam with residual gas molecules of the vacuum chamber in a storage ring. As the opening angle of the bremsstrahlung is very small, the scoring area used in Monte Carlo simulation plays a dominant role in evaluating the absorbed dose. In the present work gas bremsstrahlung angular distribution and absorbed dose for the energies ranging from 1 to 5 GeV electron storage rings are studied using the Monte Carlo code, FLUKA. From the study, an empirical formula for gas bremsstrahlung dose estimation was deduced. The results were compared with the data obtained from reported experimental values. The results obtained from simulations are found to be in very good agreement with the reported experimental data. The results obtained are applied in estimating the gas bremsstrahlung dose for 2.5 GeV synchrotron radiation source, Indus-2 at Raja Ramanna Centre for Advanced Technology, India. The paper discusses the details of the simulation and the results obtained.

  1. Open loop compensation for the eddy current effect in the APS storage ring vacuum chamber

    International Nuclear Information System (INIS)

    In the third generation synchrotron light sources, closed orbit stabilization against external vibrations is critical to ensure low emittance and high brightness. The Advanced Photon Source (APS) will use a large number (678) of correction magnets to create local bumps and to achieve global orbit stabilization. In this paper, the authors will present the result of the effort to counter the effect due to the finite inductance of the magnet and the eddy current in the 1/2inch-thick aluminum storage ring vacuum chamber. The amplitude attenuation and the phase shift of the correction magnet field inside the APS storage ring vacuum chamber were measured. A circuit to compensate for this effect was then inserted between the signal source and the magnet power supply. The amplitude was restored with an error of less than 20% of the source signal amplitude and the phase shift was reduced form 80 degree to 12 degree at 10 Hz. Incorporation of this circuit in the closed loop feedback scheme and the resulting beneficial effect in the closed orbit stabilization are discussed

  2. Shimming techniques for the ultraprecise muon g-2 storage ring at the AGS

    International Nuclear Information System (INIS)

    Major components are in an advanced state of construction for a 7 meter radius 0.1 PPM precision storage ring. Detailed techniques are planned for static shimming of the assembly to at least 10 PPM magnetic field uniformity prior to the use of field correction coils. An air gap behind each ultra-pure iron pole piece strongly decouples the aperture field shape from the properties of the 1,006 iron yoke. Iron wedges whose thickness varies across the width of the poles with slope of ∼ 1/60 are used to eliminate the gradient produced by the C-magnet shape required for open access for the decay electron counter on the inside radius of the storage ring magnet. These wedges are 10 cm in azimuthal length and can be radially adjusted for short wavelength field adjustments. A horizontal motion of 50 μm effectively adjusts the 10 cm half-gap aperture by 1 μm (or 10 PPM). This and other techniques to adjust dipole, quadrupole, sextuple, etc. multipoles will be described

  3. X-Ray microprobe characterization of materials: the case for undulators on advanced storage rings

    International Nuclear Information System (INIS)

    The unique properties of X-rays offer many advantages over electrons and other charged particles for the microcharacterization of materials. X-rays are more efficient in exciting characteristic X-ray fluorescence and produce higher fluorescent signals to backgrounds than obtained with electrons. Detectable limits for X-rays are a few parts per billion and are 10-3 to 10-5 less than obtained with electrons. Energy deposition in the sample by X-rays is 10-3 to 10-4 less than for electrons for the same detectable concentration. High-brightness storage rings, especially in the 6 GeV class with undulators, will be approximately 103 brighter in the X-ray energy range from 5 keV to 35 keV than existing storage rings and provide for X-ray microprobes that are as bright as the most advanced electron probes. Such X-ray microprobes will produce unprecedented low levels of detection in diffraction, EXAFS, Auger, and photoelectron spectoscopies for both chemical characterization and elemental identification. These major improvements in microcharacterization capabilities will be wide-ranging ramifications not only in materials science but also in physics, chemistry, geochemistry, biology, and medicine

  4. X-ray microprobe characterization of materials: the case for undulators on advanced storage rings

    International Nuclear Information System (INIS)

    The unique properties of X rays offer many advantages over electrons and other charged particles for the microcharacterization of materials. X rays are more efficient in exciting characteristic X-ray fluorescence and produce higher fluorescent signals to backgrounds than obtained with electrons. Detectable limits for X rays are a few parts per billion and are 10-3 to 10-5 less than for electrons. Energy deposition in the sample by X rays is 10-3 to 10-4 less than for electrons for the same detectable concentration. High-brightness storage rings, especially in the 6 GeV class with undulators, will be approximately 103 brighter in the X-ray energy range from 5 keV to 35 keV than existing storage rings and provide for X-ray microprobes that are as bright as the most advanced electron probes. Such X-ray microprobes will produce unprecedented low levels of detection in diffraction, EXAFS, Auger, and photoelectron spectroscopies for both chemical characterization and elemental identification. These major improvements in microcharacterization capabilities will have wide-ranging ramifications not only in materials science but also in physics, chemistry, geochemistry, biology, and medicine

  5. The large superconducting solenoids for the g-2 muon storage ring

    International Nuclear Information System (INIS)

    The g-2 muon storage ring at Brookhaven National Laboratory consists of four large superconducting solenoids. The two outer solenoids, which are 15.1 meters in diameter, share a common cryostat. The two inner solenoids, which are 13.4 meters in diameter, are in separate cryostats. The two 24 turn inner solenoids are operated at an opposite polarity from the two 24 turn outer solenoids. This generates a dipole field between the inner and outer solenoids. The flux between the solenoids is returned through a C shaped iron return yoke that also shapes the dipole field. The integrated field around the 14 meter diameter storage ring must be good to about 1 part in one million over the 90 mm dia. circular cross section where the muons are stored, averaged over the azimuth. When the four solenoids carry their 5300 A design current, the field in the 18 centimeter gap between the poles is 1.45 T. When the solenoid operates at its design current 5.5 MJ is stored between the poles. The solenoids were wound on site at Brookhaven National Laboratory. The cryostats were built around the solenoid windings which are indirectly cooled using two-phase helium

  6. Exact transfer functions for the PEP storage ring magnets and some general characteristics and techniques

    Energy Technology Data Exchange (ETDEWEB)

    Spencer, J.E.

    1982-05-01

    The exact, ion-optical transfer functions for the dipoles, quadrupoles and sextupoles of the PEP standard PODC cell are calculated for any single particle with initial coordinates (r, p, s). Modifications resulting from radiative energy loss are also calculated and discussed. These functions allow one to characterize individual magnets or classes of magnets by their aberrations and thereby simplify their study and correction. In contrast to high-energy spectrometers where aberrations are often analyzed away, those in storage rings drive series of high order resonances, even for perfect magnets (2), that can produce stop bands and other effects which can seriously limit performance. Thus, one would like to eliminate them altogether or failing this to develop local and global correction schemes. Even then, one should expect higher order effects to influence injection, extraction or single-pass systems either because of orbit distortions or overly large phase spece distortions such as may occur in low-beta insertions or any final-focus optics. The term exact means that the results here are based on solving the relativistic Lorentz force equation with accurate representations of measured magnetostatic fields. Such fields satisfy Maxwell's equations and are the actual fields seen by a particle as it propagates around a real storage ring. This is discussed in detail and illustrated with examples that show that this is possible, practical and may even be useful.

  7. Use of the Halbach perturbation theory for the multipole design of the ALS storage ring sextupole

    Energy Technology Data Exchange (ETDEWEB)

    Marks, S. [Lawrence Berkeley Lab., CA (United States)

    1995-02-01

    The Advanced Light Source (ALS) storage ring sextupole is a unique multi-purpose magnet. It is designed to operate in the primary or sextupole mode and in three auxiliary trim modes: horizontal steering, vertical steering, and skew quadrupole. Klaus Halbach developed a perturbation theory for iron-dominated magnets which provides the basis for this design. Many magnet designers, certainly those who have been exposed to Klaus, are familiar with this theory and have used it for such things as evaluating the effect of assembly alignment errors. The ALS sextupole design process was somewhat novel in its use of the perturbation theory to design essential features of the magnet. In particular, the steering and skew quadrupole functions are produced by violating sextupole symmetry and are thus perturbations of the normal sextupole excitation. The magnet was designed such that all four modes are decoupled and can be excited independently. This paper discusses the use of Halbach`s perturbation theory to design the trim functions and to evaluate the primary asymmetry in the sextupole mode, namely, a gap in the return yoke to accommodate the vacuum chamber. Prototype testing verified all operating modes of the magnet and confirmed the expected performance from calculations based upon the Halbach perturbation theory. A total of 48 sextupole magnets of this design are now installed and operating successfully in the ALS storage ring.

  8. Quasiperiodic spin-orbit motion and spin tunes in storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Barber, D.P.; Heinemann, K.; Ellison, J.A. [New Mexico Univ., Albuquerque, NM (United States). Dept. of Mathematics and Statistics

    2004-12-01

    We present an in-depth analysis of the concept of spin precession frequency for integrable orbital motion in storage rings. Spin motion on the periodic closed orbit of a storage ring can be analyzed in terms of the Floquet theorem for equations of motion with periodic parameters and a spin precession frequency emerges in a Floquet exponent as an additional frequency of the system. To define a spin precession frequency on nonperiodic synchro-betatron orbits we exploit the important concept of quasiperiodicity. This allows a generalization of the Floquet theorem so that a spin precession frequency can be defined in this case too. This frequency appears in a Floquet-like exponent as an additional frequency in the system in analogy with the case of motion on the closed orbit. These circumstances lead naturally to the definition of the uniform precession rate and a definition of spin tune. A spin tune is a uniform precession rate obtained when certain conditions are fulfilled. Having defined spin tune we define spin-orbit resonance on synchro-betatron orbits and examine its consequences. We give conditions for the existence of uniform precession rates and spin tunes (e.g. where small divisors are controlled by applying a Diophantine condition) and illustrate the various aspects of our description with several examples. The formalism also suggests the use of spectral analysis to ''measure'' spin tune during computer simulations of spin motion on synchro-betatron orbits. (orig.)

  9. CESAR, 2 MeV electron storage ring; general view from above.

    CERN Multimedia

    Service Photo

    1967-01-01

    CESAR (CERN Electron Storage and Accumulation Ring) was built as a study-model for the ISR (Intersecting Storage Rings). The model had to be small (24 m circumference) and yet the particles had to be highly relativistic, which led to the choice of electrons. On the other hand, in order to model the behaviour of protons, effects from synchrotron radiation had to be negligible, which meant low magnetic fields (130 G in the bending magnets) and a corresponding low energy of 1.75 MeV. All the stacking (accumulation) procedures envisaged for the ISR were proven with CESAR, and critical aspects of transverse stability were explored. Very importantly, CESAR was the test-bed for the ultrahigh vacuum techniques and components, essential for the ISR, with a final pressure of 6E-11 Torr. The CESAR project was decided early in 1960, design was completed in 1961 and construction in 1963. After an experimental period from 1964 to 1967, CESAR was dismantled in 1968.

  10. Measurement and Compensation of Horizontal Crabbing at the Cornell Electron Storage Ring Test Accelerator

    CERN Document Server

    Ehrlichman, M P; Hartung, W; Peterson, D P; Rider, N; Rubin, D; Sagan, D; Shanks, J P; Wang, S T

    2013-01-01

    In storage rings, horizontal dispersion in the rf cavities introduces horizontal-longitudinal ($xz$) coupling, contributing to beam tilt in the $xz$ plane. This coupling can be characterized by a "crabbing" dispersion term $\\zeta_a$ that comes from decomposing the $1$-turn transfer matrix. $\\zeta_a$ is proportional to the rf cavity voltage and the horizontal dispersion in the cavity. We report experiments at the Cornell Electron Storage Ring Test Accelerator (CesrTA) where $xz$ coupling was explored using three lattices with distinct crabbing properties. We characterize the $xz$ coupling for each case by measuring the horizontal projection of the beam with a beam size monitor. The three lattice configurations correspond to a) $16$ mrad $xz$ tilt at the beam size monitor source point, b) compensation of the $\\zeta_a$ introduced by one of two pairs of RF cavities with the second, and c) zero dispersion in RF cavities, eliminating $\\zeta_a$ entirely. Additionally, intrabeam scattering (IBS) is evident in our mea...

  11. Neutral-particle emission in collisions of electrons with biomolecular ions in an electrostatic storage ring

    International Nuclear Information System (INIS)

    Electron-biomolecular ion collisions were studied using an electrostatic storage ring with a merging electron beam device. Biomolecular ions produced by an electrospray ion source and accelerated to 20 keV/charge were injected into the ring after being mass-analyzed. The circulating ion beam was then merged with an electron beam. Neutral reaction products in collisions of electrons with ions were detected by a micro-channel plate outside of the ring. Electron-ion collisions were studied for multiply-deprotonated oligonucleotide and peptide anions as well as singly protonated oligonucleotide and peptide cations. For peptide cations, neutrals were resonantly emitted at an electron energy of around 6.5 eV, which was almost independent of the ion masses. This is deduced to come from electron-ion recombination, resulting in the cleavage of a peptide bond. For DNA oligonucleotide cations, resonant neutral particle emission was also observed. In electron and DNA anion collisions, neutrals started to increase from definite threshold energies, where the threshold energies increased in proportion to the ion charge. The same was found for peptide anions. The origin of this phenomenon is discussed

  12. Coherent modes for multiple non-rigid bunches in a storage ring

    Energy Technology Data Exchange (ETDEWEB)

    Berg, J.S.

    1996-03-01

    A method is presented for determining the stability of a system consisting of several highly relativistic bunches of charged particles circulating in a storage ring. The particles interact with magnets designed to guide the beam as well as with electromagnetic fields induced by the particles themselves. Previous work has considered modes where all bunches in the ring are executing the same type of internal oscillation. This dissertation considers the results of allowing those modes to couple to one another. The formalism begins with a self-consistent distribution, and analyzes small perturbations to that distribution to determine if they grow exponentially. The formalism allows one to do this computation for an arbitrary magnetic lattice, as well as an arbitrary distribution of wakefield sources around the ring. The method also allows for the inclusion of a feedback system which is designed to damp multibunch oscillations. The PEP-II B-factory with a linear lattice is used as an example to demonstrate and explain the phenomenology that results from this coupling of multibunch modes. The effect of adding feedback is also explored.

  13. Localized chromaticity correction of low-beta insertions in storage rings

    International Nuclear Information System (INIS)

    The correction of the chromaticity of low-beta insertions in the storage rings is usually made with sextupole lenses in the ring's arcs. When decreasing the beta functions at the insertion point (IP), this technique becomes fairly ineffective, since it fails to properly correct the higher order chromatic aberrations. Here the authors consider the approach where the chromatic effects of the quadrupole lenses generating low beta functions at the IP are corrected locally with two families of sextupoles, one family for each plane. Each family has two pairs of sextupoles which are located symmetrically on both sides of the IP. The sextupole-like aberrations of individual sextupoles are eliminated by utilizing optics forming a -I transformation between sextupoles in the pair. The optics also includes bending magnets which preserve equal dispersion functions at the two sextupoles in each pair. At sextupoles in one family, the vertical beta function is made large and the horizontal is made small. The situation is reversed in the sextupoles of the other family. The betatron phase advances from the IP to the sextupoles are chosen to eliminate a second order chromatic aberration. The application of the localized chromatic correction is demonstrated using as an example the lattice design for the Low Energy Ring of the SLAC/LBL/LLNL PEP-II B Factory

  14. Localized chromaticity correction of low-beta insertions in storage rings

    International Nuclear Information System (INIS)

    The correction of the chromaticity of low-beta insertions in the storage rings is usually made with sextupole lenses in the ring's arcs. When decreasing the beta functions at the insertion point (IP), this technique becomes fairly ineffective, since it fails to properly correct the higher order chromatic aberrations. Here we consider the approach where the chromatic effects of the quadrupole lenses generating low beta functions at the IP are corrected locally with two families of sextupoles, one family for each plane. Each family has two pairs of sextupoles which are located symmetrically on both sides of the IP. The sextupole-like aberrations of individual sextupoles are eliminated by utilizing optics forming a -I transformation between sextupoles in the pair. The optics also includes bending magnets which preserve equal dispersion functions at the two sextupoles in each pair. At sextupoles in one family, the vertical beta function is made large and the horizontal is made small. The situation is reversed in the sextupoles of the other family. The betatron phase advances from the IP to the sextupoles are chosen to eliminate a second order chromatic aberration. The application of the localized chromatic correction is demonstrated using as an example the lattice design for the Low Energy Ring of the SLAC/LBL/LLNL PEP-II B Factory

  15. Simulation of emittance dilution in electron storage ring from Compton backscattering

    International Nuclear Information System (INIS)

    A Monte-Carlo simulation of Compton backscattered λL =3.2-μm (EL = .38494 eV) photons from an IR-FEL on 75-MeV electrons in a storage ring yields an RMS electron energy spread of ΔE= 11.9-keV for a sample of 107 single scattering events. Electrons are sampled from a beam of natural energy spread σE = 5.6-keV and damped transverse angle spreads σx = .041-mrad and σy = .052-mrad (100%) coupling, scaled from the 200-MeV BNL XLS compact storage ring. The Compton-scattered X-Rays are generated from an integral of the CM Klein-Nishina cross-section transformed to the lab. A tracking calculation has also been performed in 6-dimensional phase space. Initial electron coordinates are selected randomly from a Gaussian distribution of RMS spreads σxo =.102-mm, σx'o=0.41-mrad, σyo=0.18-mm, σy'o=0.52-mrad, σφo=22-mrad and σEo=6-keV. A sample of 10000 electrons were each following for 40000 turns around the ring through an RF cavity of frf=211.54-MHz and peak voltage Vm=300-keV. Preliminary results indicate that the resulting energy distribution is quite broad with an RMS width of ΔE = 124-keV. The transverse widths are only slightly increased from their original values, i.e. Δx =.106-mm and ΔE=.043 mrad. The scaled energy spread of ΔE∼360-keV for ∼350,000 turns desired in a 10-msec X-Ray angiography exposure is well within the RF bucket used here; even VmEX=.32-keV. The electron energy damping time of τE=379-msec at 75-MeV in an XLS-type ring allows for damping this induced spread and top-off the ring between heart cycles

  16. Simulation of emittance dilution in electron storage ring from Compton backscattering

    International Nuclear Information System (INIS)

    A Monte-Carlo simulation of Compton backscattered κL=3.2-μm photons from an IR-FEL on 75-MeV electrons in a storage ring yields an RMS electron energy spread of ΔE=11.9-keV for a sample of 107 single scattering events. Electrons are sampled from a beam of natural energy spread σE = 5.6-keV and damped transverse angle spreads σx', = .041-mrad and σy' = .052-mrad (100%) coupling, scaled from the 200-MeV BNL XLS compact storage ring. The Compton-scattered X-Rays are generated from an integral of the CM Klein-Nishina cross-section transformed to the lab. A tracking calculation has also been performed in 6-dimensional phase space. Initial electron coordinates are selected randomly from a Gaussian distribution of RMS spreads σxo=.102-mm, σx'o=.041-mrad, σyo=.018-mm, σy'o=.052-mrad, σφo=22-mrad and σEo=6-keV. A sample of 10000 electrons were each following for 40000 turns around the ring through an RF cavity of frf=211.54-MHz and peak voltage Vm=300-keV. Preliminary results indicate that the resulting energy distribution is quite broad with an RMS width of ΔE = 124-keV. The transverse widths are only slightly increased from their original values, i.e. Δx = .106-mm and Δx'=.043 mrad. The scaled energy spread of ΔE ∼ 360-keV for ∼ 350,000 turns desired in a 10-msec X-Ray angiography exposure is well within the RF bucket used here; even Vm Ex=.32-keV. The electron energy damping time of τE=379-msec at 75-MeV in an XLS-type ring allows for damping this induced spread and top-off of the ring between heart cycles

  17. Photon-photon collisions, and other processes without annihilation, in e- e± storage rings

    International Nuclear Information System (INIS)

    Chapter 1: The author here presents the historical development of the idea of photon-photon collisions in electron-positron (or electron-electron) storage rings. He shows in particular the considerations which guided the work of the College de France group since this work was started in 1969. A brief review is given of the various developments of the field in the last four years. The fundamental problem of the 'tagging' of the outgoing electrons is mentioned. Chapter 2: We study the conditions which allow the rejection of the background provided by the 'heavy photon Bremsstrahlung' diagram of the same order in Q E D as the photon-photon collision diagram. We show that this background is totally negligible in the case of 'double tagging' (both electrons detected near 0 deg.). In the case of 'single tagging' (one electron detected at large angle and the other one near 0 deg.), it appears that the background can become dangerous already at moderately large values of θ when resonant enhancements (ρ, φ, ρ''') are present. Also in the case of 'no tagging' or 'tagging through absence' (i. e. checking, in e+ e- collisions, that the electrons are not scattered at large angle), it is essentially near the resonant enhancements that the background becomes about as large or larger than the γγ collision term. Various means of reducing it or eliminating it even in those cases are discussed. Chapter 3: We here consider some general features of photon-photon collision processes, in the case of double tagging; dependence on θmax (maximal tagging angle of both electrons); dependence on the beam energy; angular distributions of the particles A± produced. We then introduce realistic experimental conditions, in particular two cutoff parameters: a minimal emission angle ψmin for the particles produced, and a minimal relative energy loss χmin for the outgoing electrons. The effect of these parameters on the invariant mass spectrum of the pair A- A+ and on the integrated cross

  18. New characteristics of a single-bunch instability in the APS storage ring

    International Nuclear Information System (INIS)

    In the Advanced Photon Source storage ring, a transverse single-bunch instability has long been observed that appears unique to this ring. Many of its features have been previously reported. New results have recently been obtained using beam centroid history measurements and analysis. These preliminary results provide more detailed information regarding the characteristics of this instability and could provide insight into the physics mechanism. A new transverse single-bunch instability has been observed for several years in the Advanced Photon Source storage ring. It exhibits two distinctive modes: steady-state, with stable centroid oscillations, and bursting, with periodic burst-like oscillations. At a certain threshold current, the beam starts a steady-state oscillation whose amplitude grows gradually with increasing current. When the current reaches a second threshold, the beam quickly transits into the bursting mode whose period and amplitude changes with increasing current. At even higher current, the beam can return to a steady-state oscillation. For a given machine condition, the entire sequence may not be observed before losing the beam. The physical mechanism of this instability is not clear yet. Many measurements have been taken to characterize this instability and the results were documented. Recently, more observations were made using Model-Independent Analysis of simultaneously recorded beam histories at hundreds of turn-by-turn beam position monitors (BPMs). Some of the findings are reported here. These results are far from systematic and complete, unfortunately, because of the difficulties in data acquisition and analysis caused by our faulty beam history system. Nonetheless, these new observations provide further information on the characteristics of this unsolved instability. Since it is unsolved, we will describe the phenomena only and keep speculation to a minimum.

  19. Proton-Proton Colliding-Beam Storage Rings for the National Accelerator Laboratory: Design Study 1968

    Energy Technology Data Exchange (ETDEWEB)

    None

    1968-01-01

    This report describes the design studies on colliding-beam storage rings carried out at the National Accelerator Laboratory in the summer and fall of 1968. These studies were under the direction of Lee C. Teng. M. Stanley Livingston also played an important part in catalyzing the studies. Dr. Teng's preface, immediately following, gives a chronology of the study and lists the participants in various aspects. The purpose of the study has been to develop realistic cost estimates upon which future plans can be based. It is to be emphasized that this is not a proposal for construction. The major results of the study are that 100-100 BeV colliding beam rings can be built for approximately 75 million dollars (in 1968 dollars), utilizing conventional steel and copper magnets. This estimate includes no equipment for physics experiments. A system utilizing steel magnets that are excited by superconducting coils is estimated to cost somewhat less. A similar system using cryogenic aluminum coils appears to be slightly more costly at this time than the conventional magnet. A number of storage rings built of superconducting magnets have also been analyzed on the premise (undemonstrated as yet) that they would in fact operate satisfactorily. Such magnets designed using present technology for relatively low fields, about 40 kG, appear to be competitive with conventional magnets. Evidently a total colliding-beam facility, including experimental equipment, could be built at NAL for a sum of the order of 100 million 1968 dollars. It should be added that the terms of reference of these design studies gave emphasis to a straightforward, conservative design. Further design work and advances in technology might very well result in a significant reduction in cost or, at the same cost, provide for a greater scope.

  20. A feasibility study of an asymmetric e+e- linac-ring collider at √s corresponds to 2 GeV with some existing storage rings

    International Nuclear Information System (INIS)

    In this paper, the feasibility studies and luminosity estimates of some conceivable asymmetric e+e- linac-ring colliders are presented. The peculiar features of some storage rings (Petra, Cesr, Sps, Pep 2) are discussed in order to achieve a goal luminosity approximately equal to 1030 divided by 1031 cm-2 s-1 at √s corresponds to 2 Ge V. The performances to be provided by a suitable linac, both a superconducting or, when possible, a conventional one, are presented. Some points which are of concern in the design of the detector, due to the boosting of the outgoing particles in the laboratory frame, are introduced too

  1. Rings

    International Nuclear Information System (INIS)

    The essence of vortex physics is that at certain low-energy scales elementary excitations of a point particle theory can behave like strings rather than particles. Vortices are the resulting string-like solutions; their thickness sets the distance scale beyond which physics is string-like rather than particle-like. String degrees of freedom are massless in the sense that excitations on a string can have an arbitrarily low frequency. Non-string degrees of freedom correspond to massive particles and are absent from the low energy spectrum. This article considers only field theories with vortices at low energies. The possible existence of a class of solitons in these vortex theories will be discussed. They are vortex rings: they are localized and finite in energy, and able to carry the quantum numbers of point particles. Rings are thus particle-like solutions of a vortex theory, which is itself a limit of a point particle field theory

  2. Harnessing the monstrous: the dark side of Astrid Lindgren

    OpenAIRE

    Scott, Carole

    2011-01-01

    No ordinary girl “Pippi was no ordinary girl”, (Lindgren 1997, 69) Astrid Lindgren tells us in one of her characteristic ironic understatements. The reader certainly has no quarrel with this observation. Although, unlike Karlsson on the Roof she doesn’t have a propeller on her back, Pippi is extraordinary in other ways. Lindgren always begins by describing her strange looks – carrot-red hair in braids that stick out, a nose like a potato, patches on her clothes and unmatched stockings – and h...

  3. Status of Astrid Architecture and Pre-Conceptual Design

    International Nuclear Information System (INIS)

    After this first third party of pre-conceptual studies, 2 ASTRID models are still in the box: - steam model, with steam genarators (water/sodium exchangers..) and ‘classical’ steam turbine...; - gas model, with sodium/gas exchangers and pioneering gas turbine / compressor system. For the two models, the reactor would be the same but we select differents options to have one configuration for one model ..and we draw 2 differents layout from reactor to alternator. • With CAO soft use also for EDF EPR reactor (PDMS). • In a more simple version to make data and layouts parts exchanges easier in this project’s beginning

  4. Eesti Teadusfondi preemia Astrid Haljasele ja Tõnu Laasile

    Index Scriptorium Estoniae

    2000-01-01

    Eesti Teadusfondi täppisteaduste ekspertkomisjoni poolt korraldatud magistrantide ja doktorantide teadustööde konkursil määrati preemia 4000 krooni loodusteaduste osakonna teadurile Astrid Haljasele artikli Mankin, R., Ainsaar, A., Haljas, A. Trichotomous-noise-induced phase transitions for the stochastic Hongler model. Proc. Estonian Acad. Sci. Phys. Math., 2000, 49, 1, 28-39 eest. Loodusteaduste osakonna assistendile, TPÜ doktorandile Tõnu Laasile määrati preemia 7000 krooni artiklite sarja Lainete levik kõveras aeg-ruumis eest : [täistekst

  5. Lattice Design for PEP-X Ultimate Storage Ring Light Source

    Energy Technology Data Exchange (ETDEWEB)

    Bane, K.L.F.; Cai, Y.; Nosochkov, Y.; Wang, M.-H.; /SLAC; Hettel, R.O.; /SLAC

    2011-12-13

    SLAC expertise in designing and operating high current storage rings and the availability of the 2.2-km PEP-II tunnel present an opportunity for building a next generation light source - PEP-X - that would replace the SPEAR3 storage ring in the future. The PEP-X 'baseline' design, with 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. As a next step, a so-called 'ultimate' PEP-X lattice, reducing the emittance to 11 pm-rad at zero current, has been designed. This emittance approaches the diffraction limited photon emittance for multi-keV photons, providing near maximum photon brightness and high coherence. It is achieved by using 7-bend achromat cells in the ring arcs and a 90-m damping wiggler in one of the 6 long straight sections. Details of the lattice design, dynamic aperture, and calculations of the intra-beam scattering effect and Touschek lifetime at a nominal 0.2 A current are presented. Accelerator-based light sources are in high demand for many experimental applications. The availability of the 2.2-km PEP-II tunnel at SLAC presents an opportunity for building a next generation light source - PEP-X - that would replace the existing SPEAR3 light source in the future. The PEP-X study started in 2008, and the 'baseline' design, yielding 164 pm-rad emittance at 4.5 GeV beam energy and a current of 1.5 A, was completed in 2010. This relatively conservative design can be built using existing technology. However, for a long term future, it is natural to investigate a more aggressive, so-called 'ultimate' ring design. The goal is to reduce the electron emittance in both x and y planes to near the diffraction limited photon emittance of 8 pm-rad at hard X-ray photon wavelength of 0.1 nm. This would provide a near maximum photon brightness and significant increase in photon coherence. This study was motivated by the advances in low emittance design at MAX-IV. The latter was used as a

  6. Simultaneous linear optics and coupling correction for storage rings with turn-by-turn beam position monitor data

    CERN Document Server

    Yang, Xi

    2015-01-01

    We propose a method to simultaneously correct linear optics errors and linear coupling for storage rings using turn-by-turn (TbT) beam position monitor (BPM) data. The independent component analysis (ICA) method is used to isolate the betatron normal modes from the measured TbT BPM data. The betatron amplitudes and phase advances of the projections of the normal modes on the horizontal and vertical planes are then extracted, which, combined with dispersion measurement, are used to fit the lattice model. The fitting results are used for lattice correction. The method has been successfully demonstrated on the NSLS-II storage ring.

  7. LIGHT SOURCE: Optics for the lattice of the compact storage ring for a Compton X-ray source

    Science.gov (United States)

    Yu, Pei-Cheng; Wang, Yu; Shen, Xiao-Zhe; Huang, Wen-Hui; Yan, Li-Xin; Du, Ying-Chao; Li, Ren-Kai; Tang, Chuan-Xiang

    2009-06-01

    We present two types of optics for the lattice of a compact storage ring for a Compton X-ray source. The optics design for different operation modes of the storage ring are discussed in detail. For the pulse mode optics, an IBS-suppression scheme is applied to optimize the optics for lower IBS emittance growth rate; as for the steady mode, the method to control momentum compact factor is adopted [Gladkikh P, Phys. Rev. ST Accel. Beams 8, 050702] to obtain stability of the electron beam.

  8. Proceedings of the 1979 workshop on beam current limitations in storage rings, July 16-27, 1979

    International Nuclear Information System (INIS)

    The Workshop on Beam Current Limitations in Storage Rings was held at Brookhaven National Laboratory from July 16 to 27, 1979. The purpose of this Workshop was to discuss the physical mechanisms limiting the beam current or current density in accelerators or storage rings. Many of these machines are now being built or planned for a variety of applications, such as colliding beam experiments, synchrotron light production, heavy ion beams. This diversity was reflected in the Workshop and in the papers which have been contributed to these Proceedings. The twenty-one papers from the workshop were incorporated individually in the data base

  9. Storage Ring Cross Section Measurements for Electron Impact Ionization of Fe^11+ Forming Fe^12+ and Fe^13+

    OpenAIRE

    Hahn, M.; Bernhardt, D.; Grieser, M.; Krantz, C.; Lestinsky, M.; Mueller, A.; Novotny, O.; Repnow, R.; Schippers, S.; Wolf, A.; Savin, D. W.

    2011-01-01

    We report ionization cross section measurements for electron impact single ionization (EISI) of Fe^11+$ forming Fe^12+ and electron impact double ionization (EIDI) of Fe^11+ forming Fe^13+. The measurements cover the center-of-mass energy range from approximately 230 eV to 2300 eV. The experiment was performed using the heavy ion storage ring TSR located at the Max-Planck-Institut fur Kernphysik in Heidelberg, Germany. The storage ring approach allows nearly all metastable levels to relax to ...

  10. Application of FEL technique for constructing high-intensity, monochromatic, polarized gamma-sources at storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Saldin, E.L.; Schneidmiller, E.A.; Ulyanov, Yu.N. [Automatic Systems Corporation, Samara (Russian Federation)] [and others

    1995-12-31

    A possibility to construct high-intensity tunable monochromatic{gamma}-source at high energy storage rings is discussed. It is proposed to produce {gamma}-quanta by means of Compton backscattering of laser photons on electrons circulating in the storage. The laser light wavelength is chosen in such a way that after the scattering, the electron does not leave the separatrix. So as the probability of the scattering is rather small, energy oscillations are damped prior the next scattering. As a result, the proposed source can operate in {open_quotes}parasitic{close_quote} mode not interfering with the main mode of the storage ring operation. Analysis of parameters of existent storage rings (PETRA, ESRF, Spring-8, etc) shows that the laser light wavelength should be in infrared, {lambda}{approximately} 10 - 400 {mu}m, wavelength band. Installation at storage rings of tunable free-electron lasers with the peak and average output power {approximately} 10 MW and {approximately} 1 kW, respectively, will result in the intensity of the {gamma}-source up to {approximately} 10{sup 14}s{sup -1} with tunable {gamma}-quanta energy from several MeV up to several hundreds MeV. Such a {gamma}-source will reveal unique possibilities for precision investigations in nuclear physics.

  11. Active Damping of the E-P Instability at the Los Alamos Proton Storage Ring

    Energy Technology Data Exchange (ETDEWEB)

    Macek, R.J.; /Los Alamos; Assadi, S.; /Oak Ridge; Byrd, J.M.; /LBL, Berkeley; Deibele, C.E.; Henderson, S.D.; /Oak Ridge; Lee, S.Y.; /Indiana U.; McCrady, R.C.; /Los Alamos; Pivi, M.F.T.; /SLAC; Plum, M.A.; /Oak Ridge; Walbridge, S.B.; /Indiana U.; Zaugg, T.J.; /Los Alamos

    2008-03-17

    A prototype of an analog, transverse (vertical) feedback system for active damping of the two-stream (e-p) instability has been developed and successfully tested at the Los Alamos Proton Storage Ring (PSR). This system was able to improve the instability threshold by approximately 30% (as measured by the change in RF buncher voltage at instability threshold). The feedback system configuration, setup procedures, and optimization of performance are described. Results of several experimental tests of system performance are presented including observations of instability threshold improvement and grow-damp experiments, which yield estimates of instability growth and damping rates. A major effort was undertaken to identify and study several factors limiting system performance. Evidence obtained from these tests suggests that performance of the prototype was limited by higher instability growth rates arising from beam leakage into the gap at lower RF buncher voltage and the onset of instability in the horizontal plane, which had no feedback.

  12. The trigger system for the external target experiment in the HIRFL cooling storage ring

    Science.gov (United States)

    Li, Min; Zhao, Lei; Liu, Jin-Xin; Lu, Yi-Ming; Liu, Shu-Bin; An, Qi

    2016-08-01

    A trigger system was designed for the external target experiment in the Cooling Storage Ring (CSR) of the Heavy Ion Research Facility in Lanzhou (HIRFL). Considering that different detectors are scattered over a large area, the trigger system is designed based on a master-slave structure and fiber-based serial data transmission technique. The trigger logic is organized in hierarchies, and flexible reconfiguration of the trigger function is achieved based on command register access or overall field-programmable gate array (FPGA) logic on-line reconfiguration controlled by remote computers. We also conducted tests to confirm the function of the trigger electronics, and the results indicate that this trigger system works well. Supported by the National Natural Science Foundation of China (11079003), the Knowledge Innovation Program of the Chinese Academy of Sciences (KJCX2-YW-N27), and the CAS Center for Excellence in Particle Physics (CCEPP).

  13. Coherent Synchrotron Radiation and Bunch Stability in a Compact Storage Ring

    International Nuclear Information System (INIS)

    We examine the effect of the collective force due to coherent synchrotron radiation (CSR) in an electron storage ring with small bending radius. In a computation based on time-domain integration of the nonlinear Vlasov equation, we find the threshold current for a longitudinal microwave instability induced by CSR alone. The model accounts for suppression of radiation at long wavelengths due to shielding by the vacuum chamber. In a calculation just above threshold, small ripples in the charge distribution build up over a fraction of a synchrotron period, but then die out to yield a relatively smooth but altered distribution with eventual oscillations in bunch length. The instability evolves from small noise on an initial smooth bunch of rms length much greater than the shielding cutoff

  14. Coherent synchrotron radiation and bunch stability in a compact storage ring

    Science.gov (United States)

    Venturini, Marco; Warnock, Robert; Ruth, Ronald; Ellison, James A.

    2005-01-01

    We examine the effect of the collective force due to coherent synchrotron radiation (CSR) in an electron storage ring with small bending radius. In a computation based on time-domain integration of the nonlinear Vlasov equation, we find the threshold current for a longitudinal microwave instability induced by CSR alone. The model accounts for suppression of radiation at long wavelengths due to shielding by the vacuum chamber. In a calculation just above threshold, small ripples in the charge distribution build up over a fraction of a synchrotron period, but then die out to yield a relatively smooth but altered distribution with eventual oscillations in bunch length. The instability evolves from small noise on an initial smooth bunch of rms length much greater than the shielding cutoff.

  15. Software package for modeling spin–orbit motion in storage rings

    International Nuclear Information System (INIS)

    A software package providing a graphical user interface for computer experiments on the motion of charged particle beams in accelerators, as well as analysis of obtained data, is presented. The software package was tested in the framework of the international project on electric dipole moment measurement JEDI (Jülich Electric Dipole moment Investigations). The specific features of particle spin motion imply the requirement to use a cyclic accelerator (storage ring) consisting of electrostatic elements, which makes it possible to preserve horizontal polarization for a long time. Computer experiments study the dynamics of 106–109 particles in a beam during 109 turns in an accelerator (about 1012–1015 integration steps for the equations of motion). For designing an optimal accelerator structure, a large number of computer experiments on polarized beam dynamics are required. The numerical core of the package is COSY Infinity, a program for modeling spin–orbit dynamics

  16. Observation of microwave radiation using low-cost detectors at the ANKA storage ring*

    CERN Document Server

    Judin, V; Hofmann, A; Huttel, E; Kehrer, B; Klein, M; Marsching, S; Müller, A S; Nasse, M; Smale, N; Caspers, F; Peier, P

    2011-01-01

    Synchrotron light sources emit Coherent Synchrotron Radiation (CSR) for wavelengths longer than or equal to the bunch length. At most storage rings CSR cannot be observed, because the vacuum chamber cuts off radiation with long wavelengths. There are different approaches for shifting the CSR to shorter wavelengths that can propagate through the beam pipe, e.g.: the accelerator optics can be optimized for a low momentum compaction factor, thus reducing the bunch length. Alternatively, laser slicing can modulate substructures on long bunches [1]. Both techniques extend the CSR spectrum to shorter wavelengths, so that CSR is emitted at wavelengths below the waveguide shielding cut off. Usually fast detectors, like superconducting bolometer detector systems or Schottky barrier diodes, are used for observation of dynamic processes in accelerator physics. In this paper, we present observations of microwave radiation at ANKA using an alternative detector, a LNB (Low Noise Block) system. These devices are usually use...

  17. Dissipative effects in the beam-beam interaction of intersecting storage rings

    International Nuclear Information System (INIS)

    This proposal seeks continuing support for an ongoing research investigation of various dynamical instabilities which arise in high energy intersecting storage rings due to the beam-beam interaction. Although the dissipative effect of radiation in beam-beam machines is anticipated to be a dominant feature affecting stability in the dynamics of colliding beams of heavy particles, almost nothing is known regarding the stability problem in many-dimensional dissipative systems. The work proposed here will extend the earlier computations on weak instabilities in many-dimensional beam-beam models to include the effect of dissipation. The object of this research is to obtain conditions for global beam stability over long time scales as a function of the machine parameters

  18. Photo excitation and laser detachment of C60 − anions in a storage ring

    DEFF Research Database (Denmark)

    Støchkel, Kristian; Andersen, Jens Ulrik

    2013-01-01

    We have studied the photo physics of C60 − anions in the electrostatic storage ring ELISA with ions produced in a plasma source and cooled and bunched in a He filled ion trap. A previous study using delayed electron detachment as a signal of resonance-enhanced multiphoton electron detachment...... of the threshold for s-wave detachment at 2.664 ± 0.005 eV, slightly lower than a recent value of the electron binding, 2.683 ± 0.008 eV, obtained from the energy spectrum of photo electrons. The detachment yield is observed to increase sharply for photon energies above a threshold at 2.78 eV, maybe caused...

  19. The design of the RF cavity for the heavy ion storage ring for atomic physics

    International Nuclear Information System (INIS)

    An rf cavity and drive system have been designed for the proposed ''Heavy Ion Storage Ring for Atomic Physics,'' HISTRAP, at Oak Ridge. A peak accelerating voltage of 2.5 kV per turn is required with a continuous tuning range from 200 kHz through 2.7 MHz. A single-gap, half-wave resonant configuration is used with biased ferrite tuning. The cavity structure is completely outside of the beam line/vacuum enclosure except for a single rf window that serves as an accelerating gap. Physical separation of the cavity and beam line permits in situ vacuum baking of the beam line components at 300 degree C. A prototype cavity was designed, built, and tested. Development of frequency synthesizer and tuner control circuitry is under way

  20. Theory of a modified Wadsworth monochromator matched to a low energy storage ring source

    International Nuclear Information System (INIS)

    The concave diffraction grating in the Wadsworth mounting has been popular with synchrotron radiation spectroscopists because of its use of parallel light. This is well matched to experimental stations which are a great distance away from the source as would be the case in using a high energy synchrotron. For low energy storage rings the working distance is quite small and in this case it is appropriate to use a collimating mirror. Large collection angles are possible with this arrangement and reasonable resolution can be obtained using spherical surfaces. Astigmatism is much lower than for Rowland circle mountings. These questions are analyzed using an optical path function development and calculations are presented which include the aberrations both in the two optics and those caused by the large extension of the source in the direction of the radiation emission

  1. Long-wavelength radiation along a straight-section axis in an electron storage ring

    International Nuclear Information System (INIS)

    The long-wavelength radiation emitted along a straight-section axis of an electron storage ring is considered. A bending magnet at the beginning or end of a straight section produces cylindrically-symmetric ''edge'' radiation with radial polarization, collimated in a cone with opening angle of similar 1/γ, where γ is the relativistic mass factor. A small deflection from a steering magnet or misaligned quadrupole results in ''kicker'' radiation, also collimated with an opening angle of similar 1/γ, for which the photon flux is proportional to the square of the deflection angle. Intermediate deflection angles of similar 1/γ produce a photon flux comparable to edge radiation. Downstream of a typical straight section which includes entrance and exit bending magnet edges, wiggler or undulator, and miscellaneous steering kicks comparable to 1/γ, the long-wavelength radiation is a superposition from numerous sources, each producing a comparable photon flux with opening angle of similar 1/γ. (orig.)

  2. Estimation of the Effective Magnet Misalignments of the ALS Storage Ring

    CERN Document Server

    Nishimura, Hiroshi

    2005-01-01

    New storage ring lattices have traditionally been commissioned using a trial-and-error approach, where the number of turns circulated is slowly built up until enough beam is stored to correct the orbit. We have found that by combining the calculated response matrix of magnet misalignments from a linear model of a new lattice with the measured steering magnet response matrix used during normal operations, it is possible to make an educated guess for the steering magnet settings that will immediately allow beam circulation in the new lattice. “Effective” magnet misalignments are simply those that are sufficiently close to the real misalignments to make the first guess good enough to circulate beam; the relationship between effective and real magnet misalignments is also discussed in the paper. This predictive steering method makes the process of establishing enough circulating beam for SVD-based orbit correction in a new lattice very efficient.

  3. Theory of a modified Wadsworth monochromator matched to a low energy storage ring source

    International Nuclear Information System (INIS)

    The concave diffraction grating in the Wadsworth mounting has been popular with synchrotron radiation spectroscopists because of its use of parallel light. This is well matched to experimental stations which are a great distance away from the source as would be the case in using a high energy synchrotron. For low energy storage rings the working distance is quite small and in this case it is appropriate to use a collimating mirror. Large collection angles are possible with this arrangement and reasonable resolution can be obtained using spherical surfaces. Astigmatism is much lower than for Rowland circle mountings. These questions are analyzed using an optical path function development and calculations are presented which include the aberrations both in the two optics and those caused by the large extension of the source in the direction of the radiation emission. (orig.)

  4. Direct observation of spatio-temporal dynamics of short electron bunches in storage rings

    CERN Document Server

    Evain, C; Parquier, M Le; Szwaj, C; Tordeux, M -A; Manceron, L; Brubach, J -B; Roy, P; Bielawski, S

    2016-01-01

    In recent synchrotron radiation facilities, the use of short (picosecond) electron bunches is a powerful method for producing giant pulses of Terahertz Coherent Synchrotron Radiation (THz CSR). Here we report on the first direct observation of these pulse shapes with a few picoseconds resolution, and of their dynamics over a long time. We thus confirm in a very direct way the theories predicting an interplay between two physical processes. Below a critical bunch charge, we observe a train of identical THz pulses (a broadband Terahertz comb) stemming from the shortness of the electron bunches. Above this threshold, a large part of the emission is dominated by drifting structures, which appear through spontaneous self-organization. These challenging single-shot THz recordings are made possible by using a recently developed photonic time stretch detector with a high sensitivity. The experiment has been realized at the SOLEIL storage ring.

  5. Automatic local beam steering systems for NSLS X-Ray storage ring - Design and implementation

    International Nuclear Information System (INIS)

    Recently, two local automatic steering systems, controlled by microprocessors, have been installed and commissioned in the NSLS X-Ray storage ring. In each system, the position of the electron beam is stabilized at two locations by four independent servo systems. This paper describes three aspects of the local feedback program: (1) design, (2) commissioning and (3) limitation. The system design is explained by identifying major elements such as beam position detectors, signal processors, compensation amplifiers, ratio amplifiers, trim equalizers and microprocessor feedback controllers. System commissioning involves steps such as matching trim compensation, determination of local orbit bumps, measurement of open loop responses and design of servo circuits. Several limitations of performance are also discussed

  6. Upgrade of beam steering system components and controls for the NSLS storage rings

    International Nuclear Information System (INIS)

    The installation of the new insertion devices and new experiments on the NSLS storage rings has increased the demand for better stability of the electron orbit. This, in turn, increased the demand for better stability and resolution as well as larger bandwidth of the orbit correction system. All of the orbit correcting dipoles now have new low-hysteresis laminated steel cores. The magnets are excited by commercial wide-band (1 kHz) current regulated power supplies. The input circuits of the new power supplies permit a summation of analog inputs from orbit stabilization systems with set-point inputs digitally controlled by the operator. This paper describes the design of the new system and summarizes its present performance. 2 refs., 8 figs., 1 tab

  7. On the quantitative prediction of bunch lengthening in high energy electron storage rings

    International Nuclear Information System (INIS)

    The longitudinal current dependent electromagnetic interaction between a bunch of charged particles and accelerator components can be described by a Green's Function in time domain or by an impedance in frequency domain. The aim of this paper is to describe a procedure which yields an approximate Green's Function for cylindrically symmetric objects. Once this Green's Function is quantitatively known the equation of motion for the particles can be solved easily by a turn-by-turn tracking code on a computer. Thus it is possible to predict the bunch length and width as a function of charge per bunch for future accelerators and storage rings based on pure geometrical data of the accelerator components. Results are presented for PETRA and LEP. A comparison between measurements at PETRA and computations shows an excellent agreement. (orig.)

  8. Vacuum system development status for the APS [Advanced Photon Source] storage ring

    International Nuclear Information System (INIS)

    The status of the design and fabrication of a prototype sector of the storage ring vacuum system for the Advanced Photon Source is described. The 26.5-m-long prototype sector will be assembled within a full-scale magnet and tunnel mockup to study interspacial component relationships for maintenance, as well as the vacuum system operational performance. Each completed vacuum section is mounted as an integral part of the modular structure that contains the magnets and magnet power supplies on a common base. Unique automatic machine welding designs and techniques are employed in the fabrication of the aluminium vacuum chambers from extrusions. Special chamber bending procedures and measurements checks are used to maintain the required flatness of the insider chamber light gap surfaces. Photo-electron yields due to low-energy photons in the narrow channel gap of the vacuum chamber and their potential effects on the overall outgassing rate are found to be negligible. 9 refs., 5 figs

  9. CSR effect at XFEL-to-storage ring beam transport line, SPring-8

    International Nuclear Information System (INIS)

    A 300-meter long beam transport line will be built from the XFEL C-band linac to the existing 8 GeV storage ring at the SPring-8. The beam transport line is supposed to deliver femtosecond electron bunches with high peak current, being composed of 14 bending magnets and quadrupoles. Current status of the transport line construction plan is briefly presented. Since Coherent Synchrotron Radiation (CSR) could degrade a beam quality in such a transport line with multiple bends, tracking simulation on the effect has been employed to analyze the effect in the transport line. As a result, it was found that the CSR effect would not be negligible unless some modification would be made to either an electron bunch distribution or a lattice of the beam transport line. The numerical result on the CSR effect as well as a proposal to compress femtosecond bunches by positively utilizing CSR effect is shown. (author)

  10. Neural network technique for orbit correction in accelerators/storage rings

    International Nuclear Information System (INIS)

    The authors are exploring the use of Neural Networks, using the SNNS simulator, for orbit control in accelerators (primarily circular accelerators) and storage rings. The orbit of the beam in those machines are measured by orbit monitors (input nodes) and controlled by orbit corrector magnets (output nodes). The physical behavior of an accelerator is changing slowly in time. Thus, an adoptive algorithm is necessary. The goal is to have a trained net which will predict the exact corrector strengths which will minimize a measured orbit. The relationship between open-quotes kickclose quotes from the correctors and open-quotes responseclose quotes from the monitors is in general non-linear and may slowly change during long-term operation of the machine. In the study, several network architectures are examined as well as various training methods for each architecture

  11. Software package for modeling spin-orbit motion in storage rings

    Science.gov (United States)

    Zyuzin, D. V.

    2015-12-01

    A software package providing a graphical user interface for computer experiments on the motion of charged particle beams in accelerators, as well as analysis of obtained data, is presented. The software package was tested in the framework of the international project on electric dipole moment measurement JEDI (Jülich Electric Dipole moment Investigations). The specific features of particle spin motion imply the requirement to use a cyclic accelerator (storage ring) consisting of electrostatic elements, which makes it possible to preserve horizontal polarization for a long time. Computer experiments study the dynamics of 106-109 particles in a beam during 109 turns in an accelerator (about 1012-1015 integration steps for the equations of motion). For designing an optimal accelerator structure, a large number of computer experiments on polarized beam dynamics are required. The numerical core of the package is COSY Infinity, a program for modeling spin-orbit dynamics.

  12. Effects of vertical girder realignment in the Argonne APS storage ring

    International Nuclear Information System (INIS)

    The effects of vertical girder misalignments on the vertical orbit of the Advanced Photon Source (APS) storage ring are studied. Partial sector-realignment is prioritized in terms of the closed-orbit distortions due to misalignments of the corresponding girders in the sectors. A virtual girder-displacement (VGD) method is developed that allows the effects of a girder realignment to be tested prior to physically moving the girder. The method can also be used to anticipate the corrector strengths needed to restore the beam orbit after a realignment. Simulation results are compared to experimental results and found to reproduce the latter quite closely. Predicted corrector strengths are also found to be close to the actual local corrector strengths after a proof-of-principle two-sector realignment was performed

  13. The Heidelberg High Current Injector A Versatile Injector for Storage Ring Experiments

    CERN Document Server

    Von Hahn, R; Repnow, R; Schwalm, D; Welsch, C P

    2004-01-01

    The High Current Injector (HCI) was designed and built as a dedicated injector for the Test Storage Ring in Heidelberg to deliver mainly singly charged Li- and Be-ions. After start for routine operation in 1999 the HCI delivered stable beams during the following years for about 50 % of the experiments with very high reliability. Due to the requirements from the experiment the HCI changed during that period from a machine for singly charged positive ions to an injector for a large variety of molecules as well as positively or negatively charged light ions. After successful commissioning of the custom built 18 GHz high power ECR-source at its present test location various modifications and additions were made in preparation of a possible conversion into an injector for highly charged heavy ions as a second phase. This paper gives an overview of the experience gained in the passed 5 years and presents the status of the upgrade of the HCI.

  14. Introduction to the magnet and vacuum systems of an electron storage ring

    International Nuclear Information System (INIS)

    An accelerator or storage ring complex is a concerted interplay of various functional systems. For the convenience of discussion we can divide it into the following systems: injector, magnet, RF, vacuum, instrumentation and control. In addition, the conventional construction of the building and radiation safety consideration are also needed and finally the beam lines, detector, data acquisition and analysis set-ups for research programs. Dr. L. Teng has given a comprehensive review of the whole complex and the operation of such a facility. I concentrate on the description of magnet and vacuum systems. Only the general function of each system and the basic design concepts will be introduced, no detailed engineering practice will be given which will be best done after a machine design is produced. For further understanding and references a table of bibliography is provided at the end of the paper

  15. Storage Ring Cross Section Measurements for Electron Impact Ionization of Fe 7+

    CERN Document Server

    Hahn, M; Bernhardt, D; Grieser, M; Krantz, C; Lestinsky, M; Müller, A; Novotný, O; Repnow, R; Schippers, S; Spruck, K; Wolf, A; Savin, D W

    2015-01-01

    We have measured electron impact ionization (EII) for Fe 7+ from the ionization threshold up to 1200 eV. The measurements were performed using the TSR heavy ion storage ring. The ions were stored long enough prior to measurement to remove most metastables, resulting in a beam of 94% ground state ions. Comparing with the previously recommended atomic data, we find that the Arnaud & Raymond (1992) cross section is up to about 40\\% larger than our measurement, with the largest discrepancies below about 400~eV. The cross section of Dere (2007) agrees to within 10%, which is about the magnitude of the experimental uncertainties. The remaining discrepancies between measurement and the most recent theory are likely due to shortcomings in the theoretical treatment of the excitation-autoionization contribution.

  16. Observation of fusion-like residues in energetic nuclear collisions at the Celsius storage ring

    CERN Document Server

    Yañez, R; Aleklett, K; Kuznetsov, A; Westerberg, L; Avdeichikov, V; Siwek, A; Jakobsson, B

    2002-01-01

    Recent experiments at the CELSIUS storage ring of Uppsala, Sweden, have revealed the existence of high momentum transfer target-like fragments contrary to expectations. Recoiling heavy fragments in the reaction of 250 MeV/nucleon sup 1 sup 4 N on sup 1 sup 3 sup 1 Xe have been measured at lO with respect to the beam direction with specially designed recoil telescopes. Simulations with the Boltzmann-Uehling-Uhlenbeck (BUU) transport equation are not able to reproduce the experimental observations. Intermediate mass fragments (IMF: 3 <= Z <= 8) were also measured using three elements of the CHICSi DELTA E-E telescopes. Single energy spectra of IMFs suggest that the larger fragments (Z = 7, 8) are preferentially emitted from a single equilibrated, but very hot source (T approx 9 MeV). (Author)

  17. UHV seal studies for the advanced photon source storage ring vacuum system

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) Storage Ring Vacuum Chambers (SRVC) are constructed of aluminum. The chamber design incorporates aluminum alloy 2219-T87 Conflat flanges welded to an aluminum alloy 6063-T5 extruded chamber body. Vacuum connections to the aluminum Conflat chamber flanges are by means of 304 stainless steel Conflat flanges. To evaluate the Conflat seal assemblies relative to vacuum bake cycles, a Conflat Bake Test Assembly (CBTA) was constructed, and thermal cycling tests were performed between room temperature and 150 degrees C on both stainless steel to aluminum Conflat assemblies and aluminum to aluminum Conflat assemblies. A Helicoflex Bake Test Assembly (HBTA) was similarly constructed to evaluate Helicoflex seals. Both Conflat and Helicoflex seals were studied in a SRVC Sector String Test arrangement of five SRVC sections. The CBTA, HBTA and SRVC tests and their results are reported. 3 refs., 2 figs., 2 tabs

  18. UHV seal studies for the Advanced Photon Source storage ring vacuum system

    International Nuclear Information System (INIS)

    The Advanced Photon Source (APS) Storage Ring Vacuum Chambers (SRVC) are constructed of aluminum. The chamber design incorporates aluminum alloy 2219-T87 Conflat flanges welded to an aluminum alloy 60603-T5 extruded chamber body. Vacuum connections to the aluminum Conflat chamber flanges are by means of 304 stainless steel Conflat flanges. To evaluate the Conflat seal assemblies relative to vacuum bake cycles, a Conflat Bake Test Assembly (CBTA) was constructed, and thermal cycling tests were performed between room temperature and 150 C on both stainless steel to aluminum Conflat assemblies and aluminum to aluminum Conflat assemblies. A Helicoflex Bake Test Assembly (HBTA) was similarly constructed to evaluate Helicoflex seals. Both Conflat and Helicoflex seals were studied in a SRVC Sector String Test arrangement of five SRVC sections. The CBTA, HBTA and SRVC tests and their results are reported

  19. Beam lifetime measurement and analysis in Indus-2 electron storage ring

    Indian Academy of Sciences (India)

    Pradeep Kumar; A D Ghodke; Gurnam Singh

    2013-05-01

    In this paper, the beam lifetime measurement and its theoretical analysis are presented using measured vacuum pressure and applied radio frequency (RF) cavity voltage in Indus-2 electron storage ring at 2 GeV beam energy. Experimental studies of the effect of RF cavity voltage and bunched beam filling pattern on beam lifetime are also presented. An equation of stable beam current decay is evolved and this equation closely follows the observed beam current decay pattern. It shows that the beam is stable and the beam current decay is due to the beam–residual gas interaction (vacuum lifetime) and electron–electron interaction within a bunch (Touschek lifetime). The estimated vacuum, Touschek and total beam lifetimes from analytical formulations are also compared with the measured beam lifetime.

  20. Software package for modeling spin–orbit motion in storage rings

    Energy Technology Data Exchange (ETDEWEB)

    Zyuzin, D. V., E-mail: d.zyuzin@fz-juelich.de [St. Petersburg State University (Russian Federation)

    2015-12-15

    A software package providing a graphical user interface for computer experiments on the motion of charged particle beams in accelerators, as well as analysis of obtained data, is presented. The software package was tested in the framework of the international project on electric dipole moment measurement JEDI (Jülich Electric Dipole moment Investigations). The specific features of particle spin motion imply the requirement to use a cyclic accelerator (storage ring) consisting of electrostatic elements, which makes it possible to preserve horizontal polarization for a long time. Computer experiments study the dynamics of 10{sup 6}–10{sup 9} particles in a beam during 10{sup 9} turns in an accelerator (about 10{sup 12}–10{sup 15} integration steps for the equations of motion). For designing an optimal accelerator structure, a large number of computer experiments on polarized beam dynamics are required. The numerical core of the package is COSY Infinity, a program for modeling spin–orbit dynamics.