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Sample records for cern proton synchrotron

  1. High Intensity Beam Issues in the CERN Proton Synchrotron

    CERN Document Server

    Aumon, Sandra; Rivkin, Leonid

    This PhD work is about limitations of high intensity proton beams observed in the CERN Proton Synchrotron (PS) and, in particular, about issues at injection and transition energies. With its 53 years, the CERN PS would have to operate beyond the limit of its performance to match the future requirements. Beam instabilities driven by transverse impedance and aperture restrictions are important issues for the operation and for the High-Luminosity LHC upgrade which foresees an intensity increase delivered by the injectors. The main subject of the thesis concerns the study of a fast transverse instability occurring at transition energy. The proton beams crossing this energy range are particularly sensitive to wake forces because of the slow synchrotron motion. This instability can cause a strong vertical emittance blow-up and severe losses in less than a synchrotron period. Experimental observations show that the particles at the peak density of the beam longitudinal distribution oscillate in the vertical plane du...

  2. The proposed CERN Proton-Synchrotron upgrade program

    CERN Document Server

    Gilardoni, SS; Bartmann, W; Bartolome, S; Berrig, O; Bertone, C; Blas, A; Bodart, D; Borburgh, J; Brown, R; Butterworth, A; Buzio, M; Carli, C; Chiggiato, P; Damerau, H; Dobers, T; Folch, R; Garoby, R; Goddard, B; Gourber-Pace, M; Hancock, S; Hourican, M; Le Roux, P; Lopez Hernandez, L; Masi, A; Metral, G; Metral, E; Muttoni, Y; Nonis, M; Pierlot, J; Pittet, S; Rossi, C; Ruehl, I; Rumolo, G; Sermeus, L; Steerenberg, R; Widorski, M

    2011-01-01

    In the framework of the High-Luminosity LHC project, the CERN Proton Synchrotron (PS) would require a major upgrade to match the future beam parameters requested as pre-injector of the collider. The different beam dynamics issues, from space-charge limitations to longitudinal instabilities are discussed, as well as the proposed technical solutions to overcome them, covering the increase of the injection energy to RF related improvements.

  3. Fifty years of the CERN Proton Synchrotron Volume 2

    CERN Document Server

    CERN. Geneva; Manglunki, Django; Burnet, Jean-Paul; Carli, Christian; Chanel, Michel; Garoby, Roland; Giovannozzi, Massimo; Hancock, Steven; Haseroth, Helmut; Hübner, Kurt; Küchler, Detlef; Lewis, Julian; Lombardi, Alessandra; Martini, Michel; Maury, Stephan; Métral, Elias; Möhl, Dieter; Plass, Günther; Rinolfi, Louis; Scrivens, Richard; Steerenberg, Rende; Steinbach, Charles; Vretenar, Maurizio; Zickler, Thomas

    2013-01-01

    This report sums up in two volumes the first 50 years of operation of the CERN Proton Synchrotron. After an introduction on the genesis of the machine, and a description of its magnet and powering systems, the first volume focuses on some of the many innovations in accelerator physics and instrumentation that it has pioneered, such as transition crossing, RF gymnastics, extractions, phase space tomography, or transverse emittance measurement by wire scanners. The second volume describes the other machines in the PS complex: the proton linear accelerators, the PS Booster, the LEP pre-injector, the heavy-ion linac and accumulator, and the antiproton rings.

  4. Fifty years of the CERN Proton Synchrotron Volume 1

    CERN Document Server

    CERN. Geneva; Carli, Christian; Chanel, Michel; Garoby, Roland; Gilardoni, Simone; Giovannozzi, Massimo; Hancock, Steven; Haseroth, Helmut; Hübner, Kurt; Küchler, Detlef; Lewis, Julian; Lombardi, Alessandra; Manglunki, Django; Martini, Michel; Maury, Stephan; Métral, Elias; Möhl, Dieter; Plass, Günther; Rinolfi, Louis; Scrivens, Richard; Steerenberg, Rende; Steinbach, Charles; Vretenar, Maurizio; Zickler,Thomas

    2011-01-01

    This report sums up in two volumes the first 50 years of operation of the CERN Proton Synchrotron. After an introduction on the genesis of the machine, and a description of its magnet and powering systems, the first volume focuses on some of the many innovations in accelerator physics and instrumentation that it has pioneered, such as transition crossing, RF gymnastics, extractions, phase space tomography, or transverse emittance measurement by wire scanners. The second volume describes the other machines in the PS complex: the proton linear accelerators, the PS Booster, the LEP pre-injector, the heavy-ion linac and accumulator, and the antiproton rings.

  5. The beam coupling impedance model of CERN Proton Synchrotron

    CERN Document Server

    Persichelli, Serena; Migliorati, Mauro; Salvant, Benoit

    The research activity described in this thesis work is dedicated to developing a longitudinal and a transverse beam coupling impedance model for the CERN Proton Synchrotron (PS), in the framework of the Large Hadron Collider (LHC) Injector Upgrade (LIU) project. The study allows a better understanding of the instability threshold of the machine, helping predicting the effects of the current increase planned for the upgrade program. Furthermore, the knowledge of the machine beam coupling impedance model allows improving the stability of beams injected into the LHC chain, in prevision for the particle collision energy increase in program for LHC physics experiments.

  6. CERN Proton Synchrotron Complex High-Level Controls Renovation

    CERN Document Server

    Deghaye, S; Garcia Quintas, D; Gourber-Pace, M; Kruk, G; Kulikova, O; Lezhebokov, V; Pasinelli, S; Peryt, M; Roderick, C; Roux, E; Sobczak, M; Steerenberg, R; Wozniak, J; Zaharieva, Z

    2009-01-01

    After a detailed study of the Proton Synchrotron (PS) complex requirements by experts of CERN controls & operation groups, a proposal to develop a new system, called Injector Controls Architecture (InCA), was presented to and accepted by the management late 2007. Aiming at the homogenisation of the control systems across CERN accelerators, InCA is based on components developed for the Large Hadron Collider (LHC) but also new components required to fulfil operation needs. In 2008, the project was in its elaboration phase and we successfully validated its architecture and critical use-cases during several machine development sessions. After description of the architecture put in place and the components used, this paper describes the planning approach taken combining iterative development phases with deployment in operation for validation sessions.

  7. Transverse beam coupling impedance of the CERN Proton Synchrotron

    Science.gov (United States)

    Persichelli, S.; Migliorati, M.; Biancacci, N.; Gilardoni, S.; Metral, E.; Salvant, B.

    2016-04-01

    Beam coupling impedance is a fundamental parameter to characterize the electromagnetic interaction of a particle beam with the surrounding environment. Synchrotron machine performances are critically affected by instabilities and collective effects triggered by beam coupling impedance. In particular, transverse beam coupling impedance is expected to impact beam dynamics of the CERN Proton Synchrotron (PS), since a significant increase in beam intensity is foreseen within the framework of the LHC Injectors Upgrade (LIU) project. In this paper we describe the study of the transverse beam coupling impedance of the PS, taking into account the main sources of geometrical impedance and the contribution of indirect space charge at different energies. The total machine impedance budget, determined from beam-based dedicated machine measurement sessions, is also discussed and compared with the theoretical model.

  8. Working point and resonance studies at the CERN Proton Synchrotron

    CERN Document Server

    Huschauer, Alexander; Steerenberg, Rende

    The Proton Synchrotron (PS) is the oldest yet the most versatile particle accelerator operating at CERN. Having accelerated a multitude of different particle species within the last five decades, it is today used to define the longitudinal structure of the proton beams going into collision in the Large Hadron Collider (LHC), and thus constitutes an integral part of the LHC injector chain. Around 2020 the LHC will be subject to an upgrade to significantly increase the number of collisions at the interaction points. The beam parameters demanded by the High Luminosity LHC (HL-LHC) will, as a result, require substantial improvements of the pre-accelerators, which are currently being studied within the LHC Injectors Upgrade (LIU) project. The increase of luminosity will be accompanied by an increase of beam intensity, which might result in instabilities appearing on the injection flat bottom of the PS. Transverse Head-Tail instabilities have already been observed on operational LHC beams and an alternative stabili...

  9. The control system for the CERN proton synchrotron continuous transfer ejection

    International Nuclear Information System (INIS)

    This report describes the hardware and the software structure of a stand-alone control system for the continuous transfer ejection from the CERN Proton Synchrotron to the Super Proton Synchrotron. The process control system is built around a PDP 11/40 mini-computer interfaced to the ejection elements via CAMAC. It features automatic failure recovery and real-time process optimization. Performance, flexibility, and reliability of the system is evaluated. (Auth.)

  10. Hadron Fluence Measurements with LiF-TLD Sensors at the Proton Synchrotron Accelerator at CERN

    CERN Document Server

    Ilgner, Christoph; Obryk, Barbara

    2010-01-01

    In view of the implementation of beam-monitoring sensors for CERN's Large Hadron Collider (LHC), and also in order to validate Thermoluminescence Detectors as a versatile tool to measure ionizing radiation doses in mixed fields at hadron colliders such as the LHC, chemical vapor deposition diamond sensors have been evaluated and calibrated at CERN's Proton Synchrotron accelerator. Special attention was paid to understanding whether lithiumfluoride thermoluminescence detectors are suitable as measuring devices in these radiation fields.

  11. Hadron Fluence Measurements with LiF-TLD Sensors at the Proton Synchrotron Accelerator at CERN

    OpenAIRE

    Ilgner, Christoph; Budzanowski, Maciej; Obryk, Barbara

    2010-01-01

    In view of the implementation of beam-monitoring sensors for CERN's Large Hadron Collider (LHC), and also in order to validate Thermoluminescence Detectors as a versatile tool to measure ionizing radiation doses in mixed fields at hadron colliders such as the LHC, chemical vapor deposition diamond sensors have been evaluated and calibrated at CERN's Proton Synchrotron accelerator. Special attention was paid to understanding whether lithiumfluoride thermoluminescence detectors are suitable as ...

  12. Upgrade Strategies for the Proton Synchrotron Booster Dump at CERN

    CERN Document Server

    Sarrio Martinez, A; Maglioni, C

    2012-01-01

    CERN’s LHC Injection chain Upgrade (LIU) involves a revision of the Proton Synchrotron Booster dump, which was designed in the 1960’s to cope with beam energies reaching 800 MeV and intensities of 1e+13 particles per pulse. Thermo-mechanical studies highlighted the need for an upgrade of the dump, so that it is capable of withstanding energies in the order of 2 GeV and intensities up to 1e+14 particles per pulse. This paper proposes a new design of the dump in the light of various constraints and choices such as the geometry, materials and the integration of the required cooling system. Further topics discussed include the strategy for dismantling the old device, which has been continuously irradiated for almost 40 years and presents a difficult access. Therefore, a detailed ALARA procedure is being prepared in order to carry out the upgrade works in the area.

  13. Static Var Compensator for CERN's Proton Synchrotron Particle Accelerator

    CERN Document Server

    Kahle, K

    2004-01-01

    The following paper summarises the design studies for a new 85Mvar 18kV Static Var Compensator (SVC) for CERN’s Proton Synchrotron (PS) accelerator. Currently, the PS is supplied using a rotating motor-generator set in order to decouple the pulsating load from the electrical network. A study is undertaken to investigate the replacement of this rotating machine by an SVC. The proposed solution comprises a 85Mvar Thyristor Controlled Reactor and seven harmonic filters with a total power of 75Mvar. The paper gives a detailed description of the project background, system design and control strategy. Finally, the results of the computer studies are presented, showing the expected dynamic performance of the SVC.

  14. Experience with interactive control software at the CERN proton synchrotron

    CERN Document Server

    Carpenter, B E

    1973-01-01

    The computer system includes, in addition to the central computer, a Varian 620 used for real-time function generation and two Imlac PDS1 display mini-computers used as operator consoles. The configuration is being expanded to include 3 PDP-11/45's and links with various other online computers associated with the synchrotron, and the present survey of interactive control software in use with the old configuration was carried out as part of the planning of this expansion. This paper describes the various means of computer access available to the synchrotron operators and development engineers, and outlines the associated software. One of the more flexible pieces of software, an on-line syntax handler, is discussed in more detail. (3 refs).

  15. New RF system for the 28 GeV proton synchrotron at CERN

    CERN Document Server

    Grassmann, H C; Pirkl, Werner

    1977-01-01

    To increase the radiation energy of CERN's 28 GeV proton synchrotron, a new RF system had to be developed with extensive measuring and control equipment, as well as wide-band amplifiers, cavities and a number of new components. The protons have to be accelerated through a potential difference of 28*10/sup 9/ V to reach the final energy of 28 GeV. This is only possible using an RF system, since DC voltage fields of the required magnitude present isolation problems to which no technical solution can be found. (0 refs).

  16. Benchmarking of Simulation Codes Based on the Montague Resonance in the CERN Proton Synchrotron

    CERN Document Server

    Hofmann, Ingo; Cousineau, Sarah M; Franchetti, Giuliano; Giovannozzi, Massimo; Holmes, Jeffrey Alan; Jones, Frederick W; Luccio, Alfredo U; Machida, Shinji; Métral, E; Qiang, Ji; Ryne, Robert D; Spentzouris, Panagiotis

    2005-01-01

    Experimental data on emittance exchange by the space charge driven ‘‘Montague resonance'' have been obtained at the CERN Proton Synchrotron in 2002-04 as a function of the working point. These data are used to advance the benchmarking of major simulation codes (ACCSIM, IMPACT, MICROMAP, ORBIT, SIMBAD, SIMPSONS, SYNERGIA) currently employed world-wide in the design or performance improvement of high intensity circular accelerators. In this paper we summarize the experimental findings and compare them with the first three steps of simulation results of the still progressing work.

  17. Design Parameters of a High-Power Proton Synchrotron for Neutrino Beams at CERN

    CERN Document Server

    Papaphilippou, Y; Efthymiopoulos, I; Gerigk, F; Steerenberg, R

    2012-01-01

    Design studies have been initiated at CERN for exploring the prospects of future high-power proton beams for producing neutrinos within the LAGUNA-LBNO project. These studies include a possible increase of the SPS beam power from 500kW to 700kW for a new conventional neutrino beam line based on the CNGS technology, and at a second stage a 2 MW High-Power Proton Synchrotron (HP-PS) using the Low Power Superconducting Proton Linac (LP-SPL) as injector. A low energy 5GeV-4MW neutrino super-beam alternative based on a high-power version of SPL is also considered. This paper concentrates on the HP-PS by exploring the parameter space and constraints regarding beam characteristics, machine hardware and layout, for reaching the 2 MW average beam power.

  18. Metrological Performance of a Ferrimagnetic Resonance Marker for the Field Control of the CERN Proton Synchrotron

    CERN Document Server

    Arpaia, P; Caspers, F; Golluccio, G; Oberson, D

    2012-01-01

    In particle accelerators, “field markers” provide a digital trigger when the magnetic field crosses a given threshold. In this paper, the metrological characterization of a magnetic field marker, based on a ferrimagnetic resonance transducer referencing the flux sensed by a coil, is reported. The experimental results of a validation test campaign at the European Organization for Nuclear Research (CERN) to test the marker in static as well as fast ramping fields (up to 2.5 T/s) are illustrated. The repeatability of ±4 μT attained in the range (60 to 100) mT is very promising to increase the performance of the Proton Synchrotron accelerator at CERN.

  19. Development of a new Frequency Program in the CERN Proton Synchrotron

    CERN Document Server

    Sundal, Magnus; Larsen, Ragnhild; Johnsen, Ragnar

    The development of a new frequency program in the Proton Synchrotron (PS) is a project that links existing and new infrastructure in the first particle accelerator built at CERN. In a particle synchrotron, the magnetic field strength of the bending magnets and the revolution frequency of the particles are coupled to keep a circulating beam at fixed orbit during acceleration. The frequency program delivers a revolution frequency based on the measurements of the bending magnets. Ongoing renovations in the magnet measurement system are changing the way the information is distributed from the magnets. Once implemented, it will represent a step towards fully digital beam controls. This project involves development of both Very High Speed Integrated Circuit Hardware Description Language (VHDL) firmware and Printed Circuit Boards (PCBs) in the form of FPGA Mezzanine Cards (FMCs) to adapt the frequency program to the new transmission protocol called White Rabbit. The White Rabbit is a network solution that provides s...

  20. First implementation of transversely split proton beams in the CERN Proton Synchrotron for the fixed-target physics programme

    CERN Document Server

    Borburgh, J; Gilardoni, S; Giovannozzi, M; Hernalsteens, C; Hourican, M; Huschauer, A; Kahle, K; Le Godec, G; Michels, O; Sterbini, G

    2016-01-01

    A new extraction technique has been studied at the CERN Proton Synchrotron with a view of using it for the fixed-target physics programme at the Super Proton Synchrotron. The extraction scheme is based on advanced concepts of non-linear beam dynamics: prior to extraction a particle beam is split into several beamlets in a transverse plane by crossing a stable resonance, which allows extracting the beamlets over multiple turns. The principle of the extraction, the detail of its implementation, and the progress of the beam commissioning over the years are discussed here. More importantly, the results obtained during the first period of successful use for the physics programme are presented, focusing on the performance analysis of the novel extraction.

  1. Upgrade of the CERN Proton Synchrotron Booster bending magnets for 2 GeV Operation

    CERN Document Server

    Newborough, A; Chritin, R

    2013-01-01

    Since its first operation in 1972 at an energy of 800MeV the CERN Proton Synchrotron Booster, which consists of 4 super imposed synchrotrons, has seen two upgrades: once to 1.0 GeV in 1988 and then to 1.4 GeV in 1999. During this time the main magnets of the machine have remained largely unchanged with small differences (<1%) between the inner and outer gaps of the main bending magnet fields being compensated by trim power supplies. The future upgrade of the machine will demand to extract protons at an energy of 2.0 GeV and require almost double the original dipole field. At this field, due to saturation effects, the inner and outer gaps of the main dipole magnets will differ by up to 4%. This paper presents the design and implementation of a modification of the magnetic circuit strongly reducing these effects. We also discuss the results of experimental tests concerning the effects on field quality and eddy current transients, including the implications for the real-time magnetic field measurement system ...

  2. Measurements of electron cloud density in the CERN Super Proton Synchrotron with the microwave transmission method

    CERN Document Server

    Federmann, S; Mahner, E

    2011-01-01

    The electron cloud effect can pose severe performance limitations in high-energy particle accelerators as the CERN Super Proton Synchrotron (SPS). Mitigation techniques such as vacuum chamber thin film coatings with low secondary electron yields (SEY < 1.3) aim to reduce or even suppress this effect. The microwave transmission method, developed and first applied in 2003 at the SPS, measures the integrated electron cloud density over a long section of an accelerator. This paper summarizes the theory and measurement principle and describes the new SPS microwave transmission setup used to study the electron cloud mitigation of amorphous carbon coated SPS dipole vacuum chambers. Comparative results of carbon coated and bare stainless steel dipole vacuum chambers are given for the beam with nominal LHC 25 ns bunch-to-bunch spacing in the SPS and the electron cloud density is derived.

  3. CERN News: Selection of the type of superconducting coil for the Omega project; New intensity records at the proton synchrotron; Progress with the Spiral Reader film measuring equipment; New technique at transition energy on the proton synchrotron; CERN Courier 10th anniversary; Equipment travelling from and to Serpukhov

    CERN Multimedia

    1969-01-01

    CERN News: Selection of the type of superconducting coil for the Omega project; New intensity records at the proton synchrotron; Progress with the Spiral Reader film measuring equipment; New technique at transition energy on the proton synchrotron; CERN Courier 10th anniversary; Equipment travelling from and to Serpukhov

  4. A quadrature frequency converter in a feedback loop of high frequency cavities in the Proton Synchrotron at CERN.

    CERN Document Server

    Truszczynski, T

    This thesis presents the author’s work during the internship at the European Laboratory for Particle Physics (CERN). The quadrature frequency converter is one of the modules that has been developed to upgrade the Proton Synchrotron RF system. Basic information about accelerators, fundamentals of IQ signal representation, mixing and phase shifting techniques are introduced. The development process of the converter is presented with the design details and measurements of the prototype board.

  5. J/ψ suppression in heavy ion collisions at the CERN Super Proton Synchrotron

    International Nuclear Information System (INIS)

    We reexamine the production of J/ψ and other charmonium states for a variety of target-projectile choices at the CERN Super Proton Synchrotron, in particular for the interesting comparison between S+U at 200 GeV/c and Pb+Pb at 158 GeV/c as observed in the experiments NA38 and NA50, respectively. For this study we use a newly constructed cascade code LUCIFER II, which yields acceptable descriptions of both hard and soft processes, specifically Drell-Yan and meson production. This code divides the ion-ion collision into an initial phase involving hard interactions of the original nucleons and no soft energy loss, followed after the meson formation time by a open-quotes normalclose quotes low energy cascade among the secondary particles. The modeling of the charmonium states differs from that of earlier workers in its unified treatment of the hidden charm meson spectrum, which is introduced from the outset as a set of coupled states {ψ,χi,ψ'}. The result is a description of the NA38 and NA50 data in terms of a conventional, hadronic picture. The apparently anomalous suppression found in the most massive Pb+Pb system arises in the present simulation from three sources: destruction in the initial nucleon-nucleon cascade phase, use of coupled channels to exploit the larger breakup in the less bound χi and ψ' states, and comover interaction in the final low energy phase. copyright 1999 The American Physical Society

  6. {ital J}/{psi} suppression in heavy ion collisions at the CERN Super Proton Synchrotron

    Energy Technology Data Exchange (ETDEWEB)

    Kahana, D.E. [31 Pembrook Drive, Stony Brook, New York 11790 (United States); Kahana, S.H. [Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

    1999-03-01

    We reexamine the production of J/{psi} and other charmonium states for a variety of target-projectile choices at the CERN Super Proton Synchrotron, in particular for the interesting comparison between S+U at 200 GeV/c and Pb+Pb at 158 GeV/c as observed in the experiments NA38 and NA50, respectively. For this study we use a newly constructed cascade code LUCIFER II, which yields acceptable descriptions of both hard and soft processes, specifically Drell-Yan and meson production. This code divides the ion-ion collision into an initial phase involving hard interactions of the original nucleons and no soft energy loss, followed after the meson formation time by a {open_quotes}normal{close_quotes} low energy cascade among the secondary particles. The modeling of the charmonium states differs from that of earlier workers in its unified treatment of the hidden charm meson spectrum, which is introduced from the outset as a set of coupled states {l_brace}{psi},{chi}{sup i},{psi}{sup {prime}}{r_brace}. The result is a description of the NA38 and NA50 data in terms of a conventional, hadronic picture. The apparently anomalous suppression found in the most massive Pb+Pb system arises in the present simulation from three sources: destruction in the initial nucleon-nucleon cascade phase, use of coupled channels to exploit the larger breakup in the less bound {chi}{sup i} and {psi}{sup {prime}} states, and comover interaction in the final low energy phase. {copyright} {ital 1999} {ital The American Physical Society}

  7. Transverse beam splitting made operational: Recent progress of the multi-turn extraction at the CERN proton synchrotron

    CERN Document Server

    AUTHOR|(CDS)2082016; Borburgh, Jan; Damjanovic, Sanja; Gilardoni, Simone; Giovannozzi, Massimo; Hourican, Michael; Kahle, Karsten; Michels, Olivier; Sterbini, Guido; Hernalsteens, Cedric; Le Godec, Gilles

    2016-01-01

    Following a successful commissioning period, the Multi-Turn Extraction (MTE) at the CERN Proton Synchrotron (PS) has been applied for the fixed-target physics programme at the Super Proton Synchrotron (SPS) since September 2015. This exceptional extraction technique was proposed to replace the long-serving Continuous Transfer (CT) extraction, which has the drawback of inducing high activation in the ring. MTE exploits the principles of non-linear beam dynamics to perform loss-free beam splitting in the horizontal phase space. Over multiple turns, the resulting beamlets are then transferred to the downstream accelerator. The operational deployment of MTE was rendered possible by the full understanding and mitigation of different hardware limitations and by redesigning the extraction trajectories and non-linear optics, which was required due to the installation of a dummy septum to reduce the activation of the magnetic extraction septum. The results of the related experimental and simulation studies, a summary ...

  8. Beam coupling impedance simulation and RF measurements of a passive extraction septum for particle absorbing in the CERN Proton Synchrotron

    CERN Document Server

    Persichelli, S

    2014-01-01

    We present a study of the beam coupling impedance due to trapped modes of a new protection septum that will be installed in the CERN Proton Synchrotron (PS) during the Long Shutdown 1 (LS1). The interaction between the particle field and the discontinuities inside the septum generates electromagnetic fields localized in a particular region inside the device. These resonances, producing narrow peaks in the coupling impedance, can be potential source of beam instabilities for high intensity particle accelerators like PS. The final outcome of these studies is the basis for the acceptance of the septum installation in section 15 of the PS ring.

  9. Beam Dynamics Studies for High-Intensity Beams in the CERN Proton Synchrotron

    CERN Document Server

    AUTHOR|(CDS)2082016; Benedikt, Michael

    With the discovery of the Higgs boson, the existence of the last missing piece of the Standard Model of particle physics (SM) was confirmed. However, even though very elegant, this theory is unable to explain, for example, the generation of neutrino masses, nor does it account for dark energy or dark matter. To shed light on some of these open questions, research in fundamental particle physics pursues two complimentary approaches. On the one hand, particle colliders working at the high-energy frontier, such as the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN), located in Geneva, Switzerland, are utilized to investigate the fundamental laws of nature. Alternatively, fixed target facilities require high-intensity beams to create a large flux of secondary particles to investigate, for example, rare particle decay processes, or to create neutrino beams. This thesis investigates limitations arising during the acceleration of high-intensity beams at the CERN Proton Synchrotro...

  10. Progress in space-charge limited machines: Four times the design intensity in the CERN Proton Synchrotron Booster

    International Nuclear Information System (INIS)

    Starting from rather modes performances, the CERN Proton Synchrotron Booster has now reached its sum-of-four-rings design intensity of 1013 protons per pulse in each ring, featuring the outstanding maximum space-charge tune shift of 0.6 units. The latter requires dynamic compensation of half and (even systematic) third integer stopbands. More measures were introduced to push the intensity ceiling higher: careful choice of working area, controlled linear coupling to enhance injection efficiency and to fill the full aperture with a better-suited transverse charge distribution; bunch shaping by addition of a second-harmonic RF system, beam loading compensated by fast feedback; RF feedforward in the fundamental cavities; feedback systems taming longitudinal coupled-bunch instabilities, and transverse wide-band dampers replacing octupoles previously used. The article reviews these techniques as well as some of the Booster's unique beam diagnostics, crucial to the achievement of these performances

  11. Speech to be delivered by Mr. François de Rose, president of Council of the european organization for nuclear research on the occasion of the inauguration of the CERN proton synchrotron on 5 february 1960

    CERN Multimedia

    CERN Press Office. Geneva

    1960-01-01

    Speech to be delivered by Mr. François de Rose, president of Council of the european organization for nuclear research on the occasion of the inauguration of the CERN proton synchrotron on 5 february 1960

  12. Digital Beam Trajectory and Orbit System, for the CERN Proton Synchrotron

    CERN Document Server

    Kasprowicz, G; Raich, U

    2008-01-01

    A new trajectory and orbit measurement system using fast signal sampling and digital signal processing in an FPGA is proposed for the CERN PS. The system uses a constant sampling frequency while the beam revolution frequency changes during acceleration. Synchronization with the beam is accomplished through a numerical PLL algorithm. This algorithm is also capable of treating RF gymnastics like bunch splitting or batch compression with the help of external timing signals. Baseline and position calculation are provided in the FPGA code as well. After having implemented the algorithms in C and MatLab and tested them with data from a test run at the PS, they have now been implemented in the FPGA for online use. Results of measurements on a single beam position monitor in the CERN PS and the SIS-18 at GSI will be presented.

  13. Proton synchrotron accelerator theory

    International Nuclear Information System (INIS)

    This is the text of a series of lectures given as part of the CERN Academic Training Programme and primarily intended for young engineers and technicians in preparation for the running-in of the 400 GeV Super Proton Synchrotron (SPS). Following the definition of basic quantities, the problems of betatron motion and the effect of momentum spread and orbital errors on the transverse motion of the beam are reviewed. Consideration is then given to multipole fields, chromaticity and non-linear resonances. After dealing with basic relations governing longitudinal beam dynamics, the space-charge, resistive-wall and other collective effects are treated, with reference to precautions in the SPS to prevent their occurrence. (Auth.)

  14. Measurements of hyperon semileptonic decays at the CERN Super Proton Synchrotron

    International Nuclear Information System (INIS)

    Results on five different hyperon semileptonic decays from the WA2 experiment, performed in the CERN SPS charged hyperon beam, have been analysed within the framework of the Cabibbo model. For the first time, the inconsistencies, which inevitably occur when the results from different experiments are combined, have been avoided in these comprehensive fits to high statistics data from a single hyperon decay experiment. Excellent agreement with the basic Cabibbo model has been obtained using the WA2 data either alone or together with neutron lifetime measurements. These results contrast strongly with other recent Cabibbo analyses which have indicated the presence of SU(3) breaking effects. Using additional information on ft values for superallowed nuclear Fermi transitions, an upper limit on the mixing parameter sintheta3 in the Kobayashi-Maskawa six quark scheme has been obtained. (author)

  15. A medical proton synchrotron

    International Nuclear Information System (INIS)

    A special medical weak-focusing synchrotron using only wedge focusing at dipole ends, is proposed to make a proton cancer therapy. A new method of the turn number calculation in a proton synchrotron allowing to calculate the energy gain per turn, is formulated. 13 refs.; 10 figs.; 1 tab

  16. Synchrotron radiation from protons

    Energy Technology Data Exchange (ETDEWEB)

    Dutt, S.K.

    1992-12-01

    Synchrotron radiation from protons, though described by the same equations as the radiation from electrons, exhibits a number of interesting features on account of the parameters reached in praxis. In this presentation, we shall point out some of the features relating to (i) normal synchrotron radiation from dipoles in proton machines such as the High Energy Booster and the Superconducting Super Collider; (ii) synchrotron radiation from short dipoles, and its application to light monitors for proton machines, and (iii) synchrotron radiation from undulators in the limit when, the deflection parameter is much smaller than unity. The material for this presentation is taken largely from the work of Hofmann, Coisson, Bossart, and their collaborators, and from a paper by Kim. We shall emphasize the qualitative aspects of synchrotron radiation in the cases mentioned above, making, when possible, simple arguments for estimating the spectral and angular properties of the radiation. Detailed analyses can be found in the literature.

  17. Vibration problems in the design of the 95 MVA motor-generator set for the 28 GeV proton synchrotron at CERN

    CERN Document Server

    Geissler, Kryno K

    1972-01-01

    The main ring magnets of the 28 GeV proton synchrotron at CERN are pulse-excited from a motor generator. Power peaks of up to 70 MW cause torque shocks in the generator up to a maximum of 1 MNm (100 tonne m). The resulting vibrations must not be allowed to reach the ring magnets. The design of the machines presented a number of interesting dynamic problems. Two of the most important were the vibration of the flexibly supported foundation and the torsional vibration between the motor and generator which occurs when running on pulse duty and in the case of motor or generator line-to-line short-circuits. Measurements taken during commissioning showed that the operating performance was fully satisfactory and confirmed the design calculations. (4 refs).

  18. Generation of warm dense matter and strongly coupled plasmas using the High Radiation on Materials facility at the CERN Super Proton Synchrotron

    CERN Document Server

    Tahir, N A; Brugger, M; Assmann, R; Shutov, A; Lomonosov, I V; Gryaznov, V; Piriz, A R; Udrea, S; Hoffmann, D H H; Fortov, V E; Deutsch, C

    2009-01-01

    A dedicated facility named High Radiation on Materials (HiRadMat) is being constructed at CERN to study the interaction of the 450 GeV protons generated by the Super Proton Synchrotron (SPS) with fixed solid targets of different materials. The main purpose of these future experiments is to study the generation and propagation of thermal shock waves in the target in order to assess the damage caused to the equipment, including collimators and absorbers, in case of an accident involving an uncontrolled release of the entire beam at a given point. Detailed numerical simulations of the beam-target interaction of several cases of interest have been carried out. In this paper we present simulations of the thermodynamic and the hydrodynamic response of a solid tungsten cylindrical target that is facially irradiated with the SPS beam with nominal parameters. These calculations have been carried out in two steps. First, the energy loss of the protons is calculated in the solid target using the FLUKA code (Fasso et al....

  19. CERN PSB Beam Tests of CNAO Synchrotron's Digital LLRF

    CERN Document Server

    Angoletta, M E; De Martinis, C; Falbo, L; Findlay, A; Foglio, R; Hunt, S; Tourres, D; Vescovi, C

    2008-01-01

    The Italian National Centre for Oncological hAdrontherapy (CNAO), in its final construction phase, uses proton and carbon ion beams to treat patients affected by solid tumours. At the heart of CNAO is a 78- meter circumference synchrotron that accelerates particles to up to 400 MeV/u. The synchrotron relies on a digital LLRF system based upon Digital Signal Processors (DSPs) and Field Programmable Gate Array (FPGA). This system implements cavity servoing and beam control capabilities, such as phase and radial loops. Beam tests of the CNAO synchrotron LLRF system were carried out at CERN's Proton Synchrotron Booster (PSB) in autumn 2007, to verify the combined DSP/FPGA architecture and the beam control capabilities. For this, a prototype version of CNAO's LLRF system was adapted to the PSB requirements. This paper outlines the prototype system layout and describes the tests carried out and their results. In particular, system architecture and beam control capabilities were successfully proven by comparison wit...

  20. Managing the Real-time Behaviour of a Particle Beam Factory The CERN Proton Synchrotron Complex and its Timing System Principles

    CERN Document Server

    Bau, J C; Lewis, J; Philippe, J

    1998-01-01

    In the CERN 26 Gev Proton Synchrotron (PS) accelerator network, super-cycles are defined as sequences of different kinds of beams produced repetitively [Fig.1]. Each of these beams is characterised by attributes such as particle type, beam energy, its route through the accelerator network, and the final end user. The super-cycle is programmed by means of an editor through which the operational requirements of the physics programme can be described. Each beam in the normal sequence may later be replaced by a set of spare beams automatically depending on software and hardware interlocks and requests presented to the Master Timing Generator (MTG [Glos. 1]). The MTG calculates at run time how each beam is to be manufactured, and sends a telegram [Glos. 3] message to each accelerator, just before each cycle, describing what it should be doing now and during the next cycle. These messages, together with key machine timing events and clocks are encoded onto a timing distribution drop net where they are distributed a...

  1. The large hadron collider and the super proton synchrotron at CERN as tools to generate warm dense matter and non-ideal plasmas

    International Nuclear Information System (INIS)

    The largest accelerator in the world, the Large Hadron Collider (LHC) at CERN, has entered into commissioning phase. It is expected that when this impressive machine will become fully operational, it will generate two counter rotating 7 TeV/c proton beams that will be made to collide, leading to an unprecedented luminosity of 1034 cm-2s-1. Total energy stored in each LHC beam is about 362 MJ, sufficient to melt 500 kg copper. Safety of operation is a very critical issue when working with such extremely powerful beams. It is important to know the consequences of an accidental release of the beam energy in order to design protection system for the equipment. For this purpose we have carried out extensive numerical simulations of the interaction of one full LHC beam with copper and graphite targets which are materials of practical importance. Our calculations have shown that the LHC protons will penetrate up to about 35 m in solid copper and 10 m in solid graphite. A very interesting outcome of this work is that the impact of the LHC beam on solid matter will generate Warm Dense Matter (WDM) and Strongly Coupled Plasmas (SCP). The beams for the LHC are pre-accelerated in the SPS (Super Proton Synchrotron) to 450 GeV/c and transferred to LHC via two beam lines. Several SPS cycles are required to fill the LHC, in one cycle a batch with up to 288 bunches can be accelerated. From the safety point of view it is also very important to study the damage caused to the equipment in case of an accident involving an uncontrolled release of the SPS beam. For this purpose we have also carried out detailed numerical simulations of the impact of the full SPS beam on solid copper and tungsten targets. These simulations have shown that the targets are severely damaged by the beam. It is also interesting to note that also in this case, a large part of the target material is converted into WDM and SCP. This study, therefore, shows that the LHC and the SPS have the potential to be used

  2. Centrality dependence of proton and antiproton spectra in Pb+Pb collisions atand 158A GeV measured at the CERN Super Proton Synchrotron

    OpenAIRE

    Anticic, T.; Baatar, B.; Botje, M.A.J.; Christakoglou, P; van Leeuwen, M.(Institute for Subatomic Physics of Utrecht University, Utrecht, Netherlands); Wojtaszek-Szwarc, A.

    2011-01-01

    The yields of (anti)protons were measured by the NA49 Collaboration in centrality-selected Pb + Pb collisions at 40A and 158A GeV. Particle identification was obtained in the laboratory momentum range from 5 to 63 GeV/c by measuring the energy loss dE/dx in the time projection chamber detector gas. The corresponding rapidity coverage extends 1.6 units from midrapidity into the forward hemisphere. Transverse-mass spectra, the rapidity dependences of the average transverse mass, and rapidity de...

  3. The European 400 GeV proton synchrotron

    CERN Document Server

    Middelkoop, Willem Cornelis

    1977-01-01

    On 19th February 1971, CERN decided to build a super proton synchrotron at a cost of 1150*10/sup 6/ Swiss francs. The design target of 400 GeV with a beam intensity of 10/sup 13/ protons/pulse was reached on the 4th of November 1976 within the original budget, allowing for inflation. The technical aspects of the SPS are reviewed, together with operating experience since May 1976. (2 refs).

  4. Allocution prononcée par M. François de Rose, Président du Conseil de l'organisation européenne pour la recherche nucléaire à l'occasion de l'inauguration du synchrotron à protons du CERN le 5 février 1960

    CERN Multimedia

    CERN Press Office. Geneva

    1960-01-01

    Allocution prononcée par M. François de Rose, Président du Conseil de l'organisation européenne pour la recherche nucléaire à l'occasion de l'inauguration du synchrotron à protons du CERN le 5 février 1960

  5. The Large Hadron Collider and the Super Proton Synchrotron at CERN as Tools to Generate Warm Dense Matter and Non-Ideal Plasmas

    CERN Document Server

    Tahir, N A; Deutsch, C; Gryaznov, V; Lomonosov, I V; Shutov, A; Piriz, A R; Fortov, V E; Geissel, H; Redmer, R

    2011-01-01

    The largest accelerator in the world, the Large Hadron Collider (LHC) at CERN, has entered into commissioning phase. It is expected that when this impressive machine will become fully operational, it will generate two counter rotating 7 TeV/c proton beams that will be made to collide, leading to an unprecedented luminosity of 10(34) cm(-2)s(-1). Total energy stored in each LHC beam is about 362 MJ, sufficient to melt 500 kg copper. Safety of operation is a very critical issue when working with such extremely powerful beams. It is important to know the consequences of an accidental release of the beam energy in order to design protection system for the equipment. For this purpose we have carried out extensive numerical simulations of the interaction of one full LHC beam with copper and graphite targets which are materials of practical importance. Our calculations have shown that the LHC protons will penetrate up to about 35 m in solid copper and 10 m in solid graphite. A very interesting outcome of this work i...

  6. The Large Hadron Collider and the Super Proton Synchrotron at CERN as Tools to Generate Warm Dense Matter and Non–Ideal Plasmas

    CERN Document Server

    Tahir, N A; Shutov, A; Lomonosov, I V; Gryaznov, V; Piriz, A R; Deutsch, C; Fortov, V E

    2011-01-01

    The largest accelerator in the world, the Large Hadron Collider (LHC) at CERN, has entered into commission- ing phase. It is expected that when this impressive machine will become fully operational, it will generate two counter rotating 7 TeV/c proton beams that will be made to collide, leading to an unprecedented luminosity of 1034 cm−2s−1. Total energy stored in each LHC beam is about 362 MJ, sufficient to melt 500 kg copper. Safety of operation is a very critical issue when working with such extremely powerful beams. It is important to know the consequences of an accidental release of the beam energy in order to design protection system for the equipment. For this purpose we have carried out extensive numerical simulations of the interaction of one full LHC beam with copper and graphite targets which are materials of practical importance. Our calculations have shown that the LHC protons will penetrate up to about 35 m in solid copper and 10 m in solid graphite. A very interesting outcome of this work i...

  7. Golden Jubilee photos: The Proton Synchrotron

    CERN Multimedia

    2004-01-01

    Energy record Standing before the CERN personnel in the Main Auditorium on 25 November 1959, John Adams held not a bottle of champagne but a bottle of vodka. It had been presented to him a few months earlier during a visit to Dubna in the Soviet Union, where the world's most powerful accelerator had just been commissioned. He had been given strict instructions not to open the bottle until Dubna's energy record of 10 GeV had been broken. On 24 November, the record was smashed by CERN's brand new machine, the Proton Synchrotron, which accelerated protons at 24 GeV, over twice the energy of the Dubna machine. Before sending the empty bottle back to the Soviet Union, John Adams, who had headed the accelerator's construction, placed the recording of the signal in it as proof of the record. More than 40 years later, the PS is still going strong, delivering beams with particle densities a thousand times greater than when it first started operation. Over the years, other accelerators have grown up around it and the...

  8. La nouvelle alimentation pulsée de 60MW à 0.5Hz pour le Synchrotron à protons du CERN un système totalement statique avec stockage d’énergie par condensateurs

    CERN Document Server

    Burnet, Jean-Paul

    2010-01-01

    Le Synchrotron à proton (PS) du CERN est un accélérateur de particules mis en service en 1959. Aujourd’hui, il est plus que jamais un élément essentiel de la chaine des accélérateurs du CERN. Il reçoit les protons d’un pré-accélérateur à une énergie de 1.4GeV et il les accélère jusqu’à 25GeV. Les cycles d’accélération durent 1.2 ou 2.4 secondes et s’enchainent les uns à la suite des autres, 5000 heures par an. Cent un aimants sont répartis sur les six cents mètres de circonférence de la machine et créent un champ magnétique qui permet de conserver les protons sur la trajectoire circulaire de la machine. Ils sont tous connectés en série et alimentés par un seul convertisseur de puissance. En réalité, ce convertisseur est un système de puissance complexe comprenant un groupe tournant de 90MVA. Ce groupe est en service depuis 1968 et après plus de 200 millions de cycles, montre des signes de fatigue. Une nouvelle alimentation prendra bientôt la relève. La solution reten...

  9. 50 years of synchrotrons. Early synchrotrons in Britain, and early work for CERN. - The CERN synchrotrons. Lectures

    International Nuclear Information System (INIS)

    In the first report, 'Early synchrotrons in Britain, and early work for CERN', John Lawson gives an extended account of the material presented at the John Adams lecture, and at the same time a revised and shortened version of RAL report 97-011, which contains fuller archival references and notes. During the period covered by this report there was extensive work in Russia, where the principle of phase stability had been discovered in 1944 by Veksler. Unfortunately, all experimental work was kept secret until Veksler's talk at the first 'Atoms for Peace' conference at Geneva in August 1955. In the second lecture, 'The CERN Synchrotrons', Giorgio Brianti outlines the history of alternating-gradient synchrotrons from 1953/54 until today. In preparing this lecture he was confronted with a vast amount of material, while the time at his disposal was not even one minute per year, implying a time compression factor close to one million. Therefore, he had to exercise drastic choices, which led him to concentrate on CERN hadron synchrotrons and colliders and leave aside the Large Electron-Positron storage ring (LEP). Indeed, LEP was the subject of the John Adams Memorial Lecture in 1990, and it may be treated again in the future in connection with its energy upgrade. Even with these severe limitations, it was impossible to do justice to the number and variety of events and to the ingenuity of the people who have carved the history of CERN and of particle physics on the magnets, radiofrequency cavities, vacuum etc., and on the record performance of our machines. (orig./WL)

  10. CERN: 6 tesla superconducting persistent dipole; filming an experiment; synchroton radiation from protons

    International Nuclear Information System (INIS)

    Techniques developed at CERN for the construction of high field superconducting magnets are described. Details are given of the methods of production of 220 mm wide superconducting niobium-tin tape. A short report is given of a BBC/Open University project to film an experiment at CERN from the planning stage to its completion. Recent observations of synchrotron radiation from proton beams at the SPS synchrotron are reported. (W.D.L.).

  11. Proton-driven plasma acceleration at CERN

    International Nuclear Information System (INIS)

    Plasma-based acceleration methods have seen important progress over the last years. Recently, it has been proposed to experimentally study plasma acceleration driven by proton beams, in addition to the established research directions of electron and laser-driven plasmas. This talk presents the planned experiment and the research efforts carried out at CERN.

  12. Tests of the CERN Proton Linac Performance for LHC-Type Beams

    CERN Document Server

    Hill, C E; Scrivens, R; Vretenar, Maurizio; Feschenko, A V; Liou, A

    2000-01-01

    As the pre-injector of the LHC injector chain, the proton linac at CERN is required to provide a high-intensity (180mA) beam to the Proton Synchrotron Booster. The results of measurements at this intensity will be presented. Furthermore, the linac is now equipped with bunch shape monitors from INR, Moscow, which have allowed the comparison of the Alvarez tank RF settings with simulations.

  13. Tests of the CERN proton linac performance for LHC-type beams

    CERN Document Server

    Feschenko, A V; Lombardi, A M; Liou, A; Scrivens, R; Vretenar, Maurizio

    2000-01-01

    As the pre-injector of the LHC injector chain, the proton linac at CERN is required to provide a high-intensity (180mA) beam to the Proton Synchrotron Booster. The results of measurements at this intensity will be presented. Furthermore, the linac is now equipped with bunch shape monitors from INR, Moscow, which have allowed the comparison of the Alvarez tank RF settings with simulations.

  14. High duty factor plasma generator for CERN's Superconducting Proton Linac

    International Nuclear Information System (INIS)

    CERN's Linac4 is a 160 MeV linear accelerator currently under construction. It will inject negatively charged hydrogen ions into CERN's PS-Booster. Its ion source is a noncesiated rf driven H- volume source directly inspired from the one of DESY and is aimed to deliver pulses of 80 mA of H- during 0.4 ms at a 2 Hz repetition rate. The Superconducting Proton Linac (SPL) project is part of the luminosity upgrade of the Large Hadron Collider. It consists of an extension of Linac4 up to 5 GeV and is foreseen to deliver protons to a future 50 GeV synchrotron (PS2). For the SPL high power option (HP-SPL), the ion source would deliver pulses of 80 mA of H- during 1.2 ms and operate at a 50 Hz repetition rate. This significant upgrade motivates the design of the new water cooled plasma generator presented in this paper. Its engineering is based on the results of a finite element thermal study of the Linac4 H- plasma generator that identified critical components and thermal barriers. A cooling system is proposed which achieves the required heat dissipation and maintains the original functionality. Materials with higher thermal conductivity are selected and, wherever possible, thermal barriers resulting from low pressure contacts are removed by brazing metals on insulators. The AlN plasma chamber cooling circuit is inspired from the approach chosen for the cesiated high duty factor rf H- source operating at SNS.

  15. The Proton Synchrotron, going strong at fifty years

    CERN Multimedia

    Django Manglunki

    It was on the evening of 24 November 1959 that an incredulous Hildred Blewett, on detachment to CERN from the Brookhaven laboratory, exclaimed “Yes! We’re through transition!” The first beam of ten billion protons had not only broken through the 5.2 GeV barrier but gone on all the way to 24 GeV, the machine’s top energy at that time.   An operational screenshot from the PS, taken on its 50th anniversary. The three white peaks depict different phases (cycles) of the PS’s operation. In the first and third cycle, the PS is producing a very low-intensity beam for LHC commissioning. In the second cycle, protons are being spilled out for use in the East Area. Fifty years ago the PS, the first strong-focusing proton synchrotron using alternating gradient technology, first began to circulate beams at an unprecedented level of energy. Over the years, a complex of linear and circular accelerators and storage rings grew up around the PS. In the mid-1990s ...

  16. Measurement of small-angle antiproton-proton and proton-proton elastic scattering at the CERN intersecting storage rings

    NARCIS (Netherlands)

    Amos, N.; Block, M.M.; Bobbink, G.J.; Botje, M.A.J.; Favart, D.; Leroy, C.; Linde, F.; Lipnik, P.; Matheys, J-P.; Miller, D.

    1985-01-01

    Antiproton-proton and proton-proton small-angle elastic scattering was measured for centre-of-mass energies at the CERN Intersectung Storage Rings. In addition, proton-proton elastic scattering was measured at . Using the optical theorem, total cross sections are obtained with an accuracy of about

  17. The slow proton trigger for the CERN OMEGA spectrometer

    International Nuclear Information System (INIS)

    A full description of the calibration and setting-up of the Slow Proton Trigger for the CERN OMEGA spectrometer is given. The essential feature of the trigger is the ability to identify protons from pions using the time-of-flight and pulse height information obtained with a counter made of long slabs of plastic scintillator coupled to 58 AVP photomultipliers. The performances obtained both in proton and pion beams and during the experiment are reported. (Auth.)

  18. Commissioning of the CERN LINAC4 BPM System with 50 Mev Proton Beamns

    CERN Document Server

    Tan, J; Søby, L; Sordet, M; Wendt, M

    2013-01-01

    The new Linac4 at CERN will provide a 160 MeV H- ion beam for charge-exchange injection into the existing CERN accelerator complex. Shorted stripline pick-ups placed in the Linac intertank regions and the transfer lines will measure beam orbit, relative beam current, beam phase, and average beam energy via the time-of-flight between two pickups. A prototype Beam Position Monitor (BPM) system has been installed in the transfer line between the existing Linac2 and the Proton Synchrotron Booster (PSB) in order to study and review the complete acquisition chain. This paper presents measurements and performance of this BPM system operating with 50 MeV proton beams, and compares the results with laboratory measurements and electromagnetic simulations.

  19. Method for increasing the multiturn injection efficiency in AG proton synchrotrons by means of skew quadrupoles

    International Nuclear Information System (INIS)

    An increase of the injection efficiency due to linear coupling is shown to work in AG Proton Synchrotrons for Q/sub H/ - Q/sub V/ = p. The system is in operational use at the CERN Proton Synchrotron Booster (PSB) to reach intensities above 1013 ppp. An intensity increase of 20% is achieved at the expense of a slight vertical blow-up, which is however not noticeable for high-intensity beams as their emittance is already increased because of an integer stop-band. A comprehensive model is presented which describes the efficiency as a function of several parameters, such as the coupling strength, injection geometry and Q-values. Provided enough vertical acceptance is available, the same scheme may be profitable for other accelerators using betatron stacking for Vertical bar Q/sub H/ - Q/sub V/ - p Vertical bar > epsilon/sub V/

  20. RF-system design of proton synchrotron for hadron therapy

    International Nuclear Information System (INIS)

    A conceptual design of the RF-system for the medical proton synchrotron is presented. The synchrotron will be able to accelerate high-intensity proton beam of 6.25 · 1010 protons per pulse till the energy of 60 - 220 MeV with the repetition rate of 1 Hz. The RF-system consists of a RF-cavity with a magnetic material, a power amplifier, a tuning control system and a beam control system. The RF-system must supply 2 kV peak voltage in the frequency range from 1 to 5 MHz

  1. Measurements of dose equivalent of mixed radiation outside the Serpukhov proton synchrotron shield

    CERN Document Server

    Antipov, A V; Golovachik, V T; Khefert, M; Krupnyi, G I; Kustarev, V N; Lebedev, V N

    1979-01-01

    Comparative measurements of radiation doses outside the Serpukhov proton synchrotron shield were made with the component method (CM) and the 'Cerberus' instrument used at the Institute of High Energy Physics (IHEP) and CERN as radiation monitors, and also with the 'Sukhona-2' recombination dosimeter, a linear energy transfer radiation spectrometer based on a tissue equivalent (TE) proportional counter and a TE ionization chamber, employed at the IHEP for the direct measurements of doses and for calibrating monitoring devices used in radiation fields having an unknown composition and spectrum. (23 refs) .

  2. Heavy flavour production and heavy flavour mixing at the CERN proton-antiproton collider

    International Nuclear Information System (INIS)

    In this thesis some results of the proton-antiproton-collision experiment UA1 with the CERN Super Proton-Antiproton Synchrotron are presented and interpreted. Ch. 1 contians a general introduction to the physics motivations behind the proton-antiproton-collider project, a brief description of the CERN facilities and a summary of collider and UA1 physics achievements. Furthermore the concept of studying heavy flavours via their weak decays into muons is introduced. Ch. 2 gives a brief overview of the UA1 experimental set-up, while those parts of the detector that are relevant for the analysis, presented in this thesis, is discussed in some more detail. Ch. 3 contains a short introduction to, and motivation for the use of Monte Carlo techniques in event simulations, while Ch. 4 describes the framework of the recently developed 'EUROJET' event generator. In Ch. 5 a treatment is given of the theoretical background and concepts like 'quark-mixing' and 'CP-violation' are explained, also other useful definitions and formulae are introduced on which the later analysis of the same-sign to opposite-sign dimuon ratio is built. Data collection and event reconstruction is the subject of Ch. 6, while a detailed comparison between the theoretical models and experimentally obtained distributions is given in Ch. 7. Finally, in Ch. 8 some concluding remarks are made. 182 refs.; 81 figs.; 9 tabs

  3. The external proton beam lines and the splitter systems of the CERN SPS

    CERN Document Server

    Evans, Lyndon R; Ijspeert, Albert; de Raad, Bastiaan; Siegel, N; Weisse, E

    1977-01-01

    The exploitation of the CERN Super Proton Synchrotron (SPS) is based on two experimental areas, the West Area and the North Area. The West Area consists of the West Experimental Hall, fed by a slow ejected proton beam of 200 GeV/c maximum momentum and a Neutrino Facility which is fed by protons of 400 GeV/c. Several important detectors are installed in the West Area, the Omega spectrometer, the Big European Bubble Chamber and the heavy liquid bubble chamber Gargamelle. The North Area has been built for physics at 400 GeV/c. At present it consists of two experimental halls, a large multipurpose hall and a smaller hall dedicated to muon physics. The protons are extracted from the SPS in two of the six long straight sections (LSS) and are transported from the underground machine through a system of tunnels to the external targets. Both the beam lines to the West and North Area contain beam splitting stations which divide the slow extracted proton beam into three branches. (0 refs).

  4. A new proton spill from CERN to Gran Sasso

    CERN Multimedia

    CERN Bulletin

    2011-01-01

    Since 21 October, CERN has been sending a new type of neutrino beam to Gran Sasso. The new configuration is intended to allow the experiments to define the departure time of the neutrinos more accurately and thus check the previous results obtained using the nominal beam configuration.   The CERN Neutrino to Gran Sasso (CNGS) beam no longer operates using the standard beam time structure. Instead, a new type of proton pulse is being produced by CERN’s accelerators and sent to the graphite target to generate neutrinos. “We are now producing extremely short beam pulses,” explains Edda Gschwendtner, the physicist in charge of the CNGS secondary beam. “During a CNGS cycle we now have a LHC type bunched beam with four bunches, each about 2 ns long. Each bunch contains more than 2.5 x 1011 protons; bunches are spaced by 500 ns. In total, this makes about 1012 protons on target for each extraction from the SPS.” The CNGS beam was originally designed to m...

  5. An 8-GeV Synchrotron-Based Proton Driver

    International Nuclear Information System (INIS)

    In January 2002, the Fermilab Director initiated a design study for a high average power, modest energy proton facility. Such a facility is a possible candidate for a construction project in the U.S. starting in the middle of this decade. The key technical element is a new machine, dubbed the ''Proton Driver,'' as a replacement of the present Booster. The study of an 8-GeV synchrotron-based proton driver has been completed and published. This paper will give a summary report, including machine layout and performance, optics, beam dynamics issues, technical systems design, civil construction, cost estimate and schedule

  6. Measurement of event-by-event transverse momentum and multiplicity fluctuations using strongly intensive measures $\\Delta[P_T, N]$ and $\\Sigma[P_T, N]$ in nucleus-nucleus collisions at the CERN Super Proton Synchrotron

    CERN Document Server

    Anticic, T; Bartke, J; Beck, H; Betev, L; Bialkowska, H; Blume, C; Boimska, B; Book, J; Botje, M; Buncic, P; Christakoglou, P; Chung, P; Chvala, O; Cramer, J; Eckardt, V; Fodor, Z; Foka, P; Friese, V; Gazdzicki, M; Grebieszkow, K; Hohne, C; Kadija, K; Karev, A; Kolesnikov, V; Kowalski, M; Kresan, D; Laszlo, A; Lacey, R; van Leeuwen, M; Mackowiak-Pawlowska, M; Makariev, M; Malakhov, A; Melkumov, G; Mitrovski, M; Mrowczynski, S; Palla, G; Panagiotou, A; Pluta, J; Prindle, D; Puhlhofer, F; Renfordt, R; Roland, C; Roland, G; Rybczynski, M; Rybicki, A; Sandoval, A; Rustamov, A; Schmitz, N; Schuster, T; Seyboth, P; Sikler, F; Skrzypczak, E; Slodkowski, M; Stefanek, G; Stock, R; Strobele, H; Susa, T; Szuba, M; Varga, D; Vassiliou, M; Veres, G; Vesztergombi, G; Vranic, D; Wlodarczyk, Z; Wojtaszek-Szwarc, A

    2015-01-01

    Results from the NA49 experiment at the CERN SPS are presented on event-by-event transverse momentum and multiplicity fluctuations of charged particles, produced at forward rapidities in central Pb+Pb interactions at beam momenta 20$A$, 30$A$, 40$A$, 80$A$, and 158$A$ GeV/c, as well as in systems of different size ($p+p$, C+C, Si+Si, and Pb+Pb) at 158$A$ GeV/c. This publication extends the previous NA49 measurements of the strongly intensive measure $\\Phi_{p_T}$ by a study of the recently proposed strongly intensive measures of fluctuations $\\Delta[P_T, N]$ and $\\Sigma[P_T, N]$. In the explored kinematic region transverse momentum and multiplicity fluctuations show no significant energy dependence in the SPS energy range. However, a remarkable system size dependence is observed for both $\\Delta[P_T, N]$ and $\\Sigma[P_T, N]$, with the largest values measured in peripheral Pb+Pb interactions. The results are compared with NA61/SHINE measurements in $p+p$ collisions, as well as with predictions of the UrQMD and ...

  7. CAS CERN Accelerator School. Synchrotron radiation and free electron lasers. Proceedings

    International Nuclear Information System (INIS)

    These proceedings present the lectures given at the tenth specialised course organised by the CERN Accelerator School (CAS), the topic this time being 'Synchrotron Radiation and Free-electron Lasers'. A similar course was already given at Chester, UK in 1989 and whose proceedings were published as CERN 90-03. However, recent progress in this field has been so rapid that it became urgent to present a revised version of the course. Starting with a review of the characteristics of synchrotron radiation there follows introductory lectures on electron dynamics in storage rings, beam insertion devices, and beam current and radiation brightness limits. These themes are then developed with more detailed lectures on lattices and emittance, wigglers and undulators, current limitations, beam lifetime and quality, diagnostics and beam stability. Finally lectures are presented on linac and storage ring free-electron lasers. (orig.)

  8. Study of a Rapid Cycling Synchrotron to replace the CERN PS Booster

    CERN Document Server

    Hanke, K; Angoletta, M E; Balhan, B; Bartmann, W; Benedikt, M; Borburgh, J; Bozzini, D; Carli, C; Dahlen, P; Dobers, T; Fitterer, M; Garoby, R; Gilardoni, S; Goddard, B; Hansen, J; Hermanns, T; Lopez-Hernandez, L A; Hourican, M; Jensen, S; Kosmicki, A; Meddahi, M; Mikulec, B; Newborough, A; Nonis, M; Olek, S; Paoluzzi, M; Pittet, S; Puccio, B; Raginel, V; Ruehl, I; Schönauer, H; Sermeus, L; Steerenberg, R; Tan, J; Tückmantel, J; Vretenar, M; Widorski, M

    2011-01-01

    CERN’s proton injector chain is undergoing a massive consolidation and upgrade program in order to deliver beams meeting the needs of the LHC Luminosity Upgrade. As an alternative to the upgrade of the existing Proton Synchrotron Booster (PSB), the construction of a Rapid Cycling Synchrotron (RCS) has been studied. This machine would replace the PSB and deliver beams to the LHC as well as to CERN’s rich fixed-target physics program. This paper summarizes the outcome of the feasibility study along with a tentative RCS design.

  9. Electron cloud observations at the ISIS Proton Synchrotron

    OpenAIRE

    Pertica, A.; Payne, S. J.

    2013-01-01

    The build up of electron clouds inside a particle accelerator vacuum chamber can produce strong transverse and longitudinal beam instabilities which in turn can lead to high levels of beam loss often requiring the accelerator to be run below its design specification. To study the behaviour of electron clouds at the ISIS Proton Synchrotron, a Micro-Channel Plate (MCP) based electron cloud detector has been developed. The detector is based on the Retarding Field Analyser (RFA) design and consis...

  10. A PVSS Application for Monitoring the Start-up of the Super Proton Synchrotron after Major Breakdowns

    CERN Document Server

    Stowisek, J

    2001-01-01

    Supervisory Control and Data Acquisition (SCADA) systems are widely employed in monitoring and controlling technical facilities at the European Organization for Nuclear Research (CERN). Various kinds of SCADA systems are used for the supervision of electricity, cooling, cryogenics and other systems as wells as for the control of the laboratory's particle accelerators and high-energy physics (HEP) experiments. This thesis is concerned with the development of a software application for two of CERN's main control rooms, for monitoring the start-up of the Super Proton Synchrotron (SPS), the laboratory's second largest particle accelerator. Following a CERN recommendation, the application is based on PVSS II, a commercial off-the-shell SCADA product that will replace the heterogeneous component architecture currently used for monitoring SPS equipment. The set-up of the SCADA system in a redundant, distributed and scattered manner in order to guarantee high dependability and the possibility of doing data exchange w...

  11. Design of Injection and Extraction Systems with Optimisation of Lattice and Layout for the CERN PS2 Synchrotron

    CERN Document Server

    Bartmann, W

    2009-01-01

    The CERN Proton Synchrotron PS2 is one of the foreseen accelerators for the LHC injector upgrade. This upgrade aims first at increasing the instantaneous luminosity of LHC and second at providing a reliable beam for the CERN accelerator complex. From this aspect, the main characteristics of the PS2 are high reliability for high intensity beams. The goal of this thesis was the design of the machine’s lattice and injection/extraction systems meeting the constraints coming mainly from the LHC beam type but also from beam requirements of experiments at PS2 and the SPS. In the design, the given energy range together with filling schemes for different beam types and RF cogging were first used to define the circumference of the machine. Estimates on the space requirements of injection/extraction systems were made in order to divide the total machine length between arc and long straight section. Existing tunnels for transfer lines together with the minimisation of the total transfer line length favoured a race trac...

  12. System software of the CERN proton synchrotron control system

    International Nuclear Information System (INIS)

    The PS complex consists of 10 different interconnected accelerators or storage rings, mainly controlled by the same distributed system of NORD-10 and ND-100 minicomputers. After a brief outline of the hardware, this report gives a detailed description of the system software, which is based on the SINTRAN III operating system. It describes the general layout of the software, the network, CAMAC access, programming languages, program development, and microprocessor support. It concludes with reviews of performance, documentation, organization and methods, and future prospects. (orig.)

  13. CMS Centre at CERN

    CERN Multimedia

    2007-01-01

    A new "CMS Centre" is being established on the CERN Meyrin site by the CMS collaboration. It will be a focal point for communications, where physicists will work together on data quality monitoring, detector calibration, offline analysis of physics events, and CMS computing operations. Construction of the CMS Centre begins in the historic Proton Synchrotron (PS) control room. The historic Proton Synchrotron (PS) control room, Opened by Niels Bohr in 1960, will be reused by CMS to built its control centre. TThe LHC@FNAL Centre, in operation at Fermilab in the US, will work very closely with the CMS Centre, as well as the CERN Control Centre. (Photo Fermilab)The historic Proton Synchrotron (PS) control room is about to start a new life. Opened by Niels Bohr in 1960, the room will be reused by CMS to built its control centre. When finished, it will resemble the CERN Contro...

  14. Electron cloud observations at the ISIS Proton Synchrotron

    CERN Document Server

    Pertica, A

    2013-01-01

    The build up of electron clouds inside a particle accelerator vacuum chamber can produce strong transverse and longitudinal beam instabilities which in turn can lead to high levels of beam loss often requiring the accelerator to be run below its design specification. To study the behaviour of electron clouds at the ISIS Proton Synchrotron, a Micro-Channel Plate (MCP) based electron cloud detector has been developed. The detector is based on the Retarding Field Analyser (RFA) design and consists of a retarding grid, which allows energy analysis of the electron signal, and a MCP assembly placed in front of the collector plate. The MCP assembly provides a current gain over the range 300 to 25K, thereby increasing the signal to noise ratio and dynamic range of the measurements. This paper presents the first electron cloud observations at the ISIS Proton Synchrotron. These results are compared against signals from a beam position monitor and a fast beam loss monitor installed at the same location.

  15. First experimental evidence of hydrodynamic tunneling of ultra–relativistic protons in extended solid copper target at the CERN HiRadMat facility

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, R.; Grenier, D.; Wollmann, D. [CERN-AB, 1211 Geneva 23 (Switzerland); Blanco Sancho, J. [CERN-AB, 1211 Geneva 23, Switzerland and Ecole Polytechnique Federale de Lausanne, Lausanne (Switzerland); Burkart, F. [CERN-AB, 1211 Geneva 23, Switzerland and Goethe University, Frankfurt (Germany); Tahir, N. A. [GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt (Germany); Shutov, A. [Institute of Problems of Chemical Physics, Chernogolovka (Russian Federation); Piriz, A. R. [E.T.S.I. Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real (Spain)

    2014-08-15

    A novel experiment has been performed at the CERN HiRadMat test facility to study the impact of the 440 GeV proton beam generated by the Super Proton Synchrotron on extended solid copper cylindrical targets. Substantial hydrodynamic tunneling of the protons in the target material has been observed that leads to significant lengthening of the projectile range, which confirms our previous theoretical predictions [N. A. Tahir et al., Phys. Rev. Spec. Top.-Accel. Beams 15, 051003 (2012)]. Simulation results show very good agreement with the experimental measurements. These results have very important implications on the machine protection design for powerful machines like the Large Hadron Collider (LHC), the future High Luminosity LHC, and the proposed huge 80 km circumference Future Circular Collider, which is currently being discussed at CERN. Another very interesting outcome of this work is that one may also study the field of High Energy Density Physics at this test facility.

  16. First experimental evidence of hydrodynamic tunneling of ultra–relativistic protons in extended solid copper target at the CERN HiRadMat facility

    CERN Document Server

    Schmidt, R; Sancho, J Blanco; Burkart, F; Grenier, D; Wollmann, D; Tahir, N A; Shutov, A; Piriz, A R

    2014-01-01

    A novel experiment has been performed at the CERN HiRadMat test facility to study the impact of the 440 GeV proton beam generated by the Super Proton Synchrotron on extended solid copper cylindrical targets. Substantial hydrodynamic tunneling of the protons in the target material has been observed that leads to significant lengthening of the projectile range, which confirms our previous theoretical predictions [N. A. Tahir et al., Phys. Rev. Spec. Top.-Accel. Beams 15, 051003 (2012)]. Simulation results show very good agreement with the experimental measurements. These results have very important implications on the machine protection design for powerful machines like the Large Hadron Collider (LHC), the future High Luminosity LHC, and the proposed huge 80 km circumference Future Circular Collider, which is currently being discussed at CERN. Another very interesting outcome of this work is that one may also study the field of High Energy Density Physics at this test facility.

  17. Impact of high energy high intensity proton beams on targets: Case studies for Super Proton Synchrotron and Large Hadron Collider

    Science.gov (United States)

    Tahir, N. A.; Sancho, J. Blanco; Shutov, A.; Schmidt, R.; Piriz, A. R.

    2012-05-01

    The Large Hadron Collider (LHC) is designed to collide two proton beams with unprecedented particle energy of 7 TeV. Each beam comprises 2808 bunches and the separation between two neighboring bunches is 25 ns. The energy stored in each beam is 362 MJ, sufficient to melt 500 kg copper. Safety of operation is very important when working with such powerful beams. An accidental release of even a very small fraction of the beam energy can result in severe damage to the equipment. The machine protection system is essential to handle all types of possible accidental hazards; however, it is important to know about possible consequences of failures. One of the critical failure scenarios is when the entire beam is lost at a single point. In this paper we present detailed numerical simulations of the full impact of one LHC beam on a cylindrical solid carbon target. First, the energy deposition by the protons is calculated with the FLUKA code and this energy deposition is used in the BIG2 code to study the corresponding thermodynamic and the hydrodynamic response of the target that leads to a reduction in the density. The modified density distribution is used in FLUKA to calculate new energy loss distribution and the two codes are thus run iteratively. A suitable iteration step is considered to be the time interval during which the target density along the axis decreases by 15%-20%. Our simulations suggest that the full LHC proton beam penetrates up to 25 m in solid carbon whereas the range of the shower from a single proton in solid carbon is just about 3 m (hydrodynamic tunneling effect). It is planned to perform experiments at the experimental facility HiRadMat (High Radiation Materials) at CERN using the proton beam from the Super Proton Synchrotron (SPS), to compare experimental results with the theoretical predictions. Therefore simulations of the response of a solid copper cylindrical target hit by the SPS beam were performed. The particle energy in the SPS beam is 440

  18. A measurement of direct electron production in proton-proton collisions at the CERN ISR

    International Nuclear Information System (INIS)

    A measurement of direct single electron production in proton proton collisions at a centre of mass energy of √s = 62.8 GeV is reported. The experiment was performed at the CERN Intersecting Storage Rings using the Split-Field-Magnet detector. In an angular range of Δthetasub(cm) = 350 around a polar angle of thetasub(cm) = 900 and over a transverse momentum range .3 = 1 GeV/c at a level of approximately 2x10-4 of the equivalent inclusive charged pion cross section. With decreasing psub(t) the signal rises slightly to reach about 4x10-4 at the lowest psub(t) value. Direct electrons at such low transverse momenta are usually interpreted as decay products of semileptonic decays of charmed particles. This interpretation is confirmed by observation of the hadronic decay of the associated charmed particle (D0 meson and Λsub(c)+ baryon). Using different production models for the creation of pairs of charmed particles, the total cross section for the production of charmed particles in proton collisions is estimated to range from 200 μb to 900 μb depending on the model assumptions. (orig.)

  19. Experiments at CERN in 1984

    International Nuclear Information System (INIS)

    This book is a compilation of the current experimental program at CERN. The experiments listed are being performed at one of the following machines: the Super Proton Synchrotron (SPS), the Proton Synchrotron (PS) and the Synchro-Cyclotron (SC). The Intersecting Storage Rings (ISR) have ceased functioning early this year. The four approved experiments to be done by means of the Large Electron Positron machine (LEP) are also listed. (orig./HSI)

  20. Experiments at CERN in 1986

    International Nuclear Information System (INIS)

    This report is a compilation of the current experimental programme at CERN. The experiments listed are being performed at one of the following machines: The Super Proton Synchrotron, the Proton Synchrotron and the Synchro-Cyclotron. The four experiments planned for the Large Electron Positron machine are also listed. Each experiment is briefly described and a schematic layout of its apparatus is included, together with lists of participants and institutions. (orig./HSI)

  1. Spatial and temporal beam profile monitor with nanosecond resolution for CERN's Linac4 and Superconducting Proton Linac

    CERN Document Server

    Hori, M

    2008-01-01

    The Linac4, now being developed at CERN, will provide 160-MeV H- beams of high intensity . Before this beam can be injected into the CERN Proton Synchrotron Booster or future Superconducting Proton Linac for further acceleration, some sequences of 500-ps-long micro-bunches must be removed from it, using a beam chopper. These bunches, if left in the beam, would fall outside the longitudinal acceptance of the accelerators and make them radioactive. We developed a monitor to measure the time structure and spatial profile of this chopped beam, with respective resolutions and . Its large active area and dynamic range also allows investigations of beam halos. The ion beam first struck a carbon foil, and secondary electrons emerging from the foil were accelerated by a series of parallel grid electrodes. These electrons struck a phosphor screen, and the resulting image of the scintillation light was guided to a thermoelectrically cooled, charge-coupled device camera. The time resolution was attained by applying high-...

  2. Energy dependence of proton-proton and antiproton-proton scattering at the CERN intersecting storage rings

    International Nuclear Information System (INIS)

    This thesis describes measurements of proton-proton and proton-antiproton elastic scattering with the scattered particles emerging at small angles in the centre of mass (CM) system. These measurements have been performed at the CERN Intersecting Storage Rings (ISR). The direct comparison of pp and anti pp scattering in this energy range is of considerable interest. This is because measurements on pp scattering alone, have revealed that in the ISR energy range both elastic- and total pp cross-sections increase with increasing energy. It is the subject of this thesis to check the prediction that the proton-antiproton cross section will do the same. The present experiment measures the angular distribution of pp and anti pp elastic scattering at small angles (typically 1-10 mrad) and at different energies. From these measurements a comparison of the energy behaviour of the pp and anti pp forward nuclear scattering amplitudes is obtained. This behaviour can be described in terms of three parameters: the total cross-section, the ratio of the real-to-imaginary part of the forward nuclear amplitude and a parameter, the slope, characterising the dependence of the process on the squared four-momentum transfer between the incident and the scattered particle. (Auth.)

  3. Search for Charmed Particle Production in Proton Proton Collisions at the CERN ISR

    CERN Document Server

    Marsh, William L

    1977-01-01

    Experimental results on a search for charmed particle production in proton-proton collisions at the center of mass energy (..sqrt..s) of 53 GeV are presented. Evidence of cidences, a signature of charmed particle production, was sought. The inclusive e/..pi.. ratio was measured with a magnetic spectrometer located at 32/sup 0/ from Beam 1 of Intersection I6 of the CERN Intersecting Storage Rings (ISR). The e/..pi.. ratio from direct (unknown) sources was found to rise from 1.06 x 10/sup -4/ at p/sub perpendicular to/ = 1.5 GeV/c to 5.53 x 10/sup -4/ at p/sub perpendicular to/ = 0.25 GeV/c. One possible source for this signal is the semi-leptonic decay of charmed particles (e.g., D ..-->.. K/sup 0/ e..nu..). If so, then electron-strange particle (e.g., ..lambda../sup 0/,K/sup 0/) coincidences are expected. The charged decay products of ..lambda../sup 0/ and K/sup 0/ were detected in a multiparticle spectrometer surrounding Beam 1 downstream of the intersection. To determine if there is an electron-strange part...

  4. Nonlinear resonance islands and modulational effects in a proton synchrotron

    International Nuclear Information System (INIS)

    The authors examine one-dimensional and two-dimensional nonlinear resonance islands created in the transverse phase space of a proton synchrotron by nonlinear magnets. The authors examine application of the theoretical framework constructed to the phenomenon of modulational diffusion in a collider model of the Fermilab Tevatron. For the one-dimensional resonance island system, the authors examine the effects of two types of modulational perturbations on the stability of these resonance islands: Tune modulation and beta function modulation. Hamiltonian models are presented which predict stability boundaries that depend on only three parameters: The strength and frequency of the modulation and the frequency of small oscillations inside the resonance island. The tune modulation model is successfully tested in experiment, where frequency domain analysis coupled with tune modulation is demonstrated to be useful in measuring the strength of a nonlinear resonance. Nonlinear resonance islands are examined in two transverse dimensions in the presence of coupling and linearly independent crossing resonances. The authors present a first-order Hamiltonian model which predicts fixed point locations, but does not reproduce small oscillation frequencies seen in tracking. Particle tracking is presented which shows evidence of two-dimensional persistent signals, and the authors make suggestions on methods for observing such signals in future experiment. The authors apply the tune modulation stability diagram to the explicitly two-dimensional phenomenon of modulational diffusion in the Fermilab Tevatron with beam-beam kicks as the source of nonlinearity. The amplitude growth created by this mechanism in simulation is exponential rather than root-time as predicted by modulational diffusion models. The authors comment upon the luminosity and lifetime limitations such a mechanism implies in a proton storage ring

  5. Has CERN made the stuff of the newborn universe?

    CERN Multimedia

    Taubes, G

    1997-01-01

    Researchers at CERN report indications that they have recreated quark-gluon plasma in their Super Proton Synchrotron particle accelerator. The evidence involves the disappearance of of J/psi particles in lead-lead collisions.

  6. A Proposed Experimental Test of Proton-Driven Plasma Wakefield Acceleration Based on CERN SPS

    CERN Document Server

    Xia, G X; Lotov, K; Pukhov, A; Assmann, R; Zimmermann, F; Huang, C; Vieira, J; Lopes, N; Fonseca, RA; Silva, LO; An, W; Joshi, C; Mori, W; Lu, W; Muggli, P

    2011-01-01

    Proton-bunch driven plasma wakefield acceleration (PDPWA) has been proposed as an approach to accelerate electron beam to TeV energy regime in a single plasma section. An experimental test has recently proposed to demonstrate the capability of PDPWA by using proton beams from the CERN SPS. The layout of the experiment is introduced. Particle-in-cell simulation results based on the realistic beam parameters are presented. Presented at PAC2011 New York, 28 March - 1 April 2011.

  7. 50 million million protons for CERN's fiftieth anniversary

    CERN Multimedia

    2004-01-01

    The SPS set a new intensity record at the end of September. This performance was the result of work on the whole accelerator chain, from the proton source to the SPS. The aim was to explore the limits of the machines in providing protons for the CNGS facility, which needs very high intensities.

  8. Acceleration of polarized protons in the KEK 12 GeV Proton Synchrotron

    International Nuclear Information System (INIS)

    By computing the spin as well as orbit motion of each particle, it is shown that acceleration of polarized protons is feasible if a rapid change is made in νsub(z) at four medium strong resonances out of eleven in total. The remaining seven resonances are so strong that at each of them, the polarization only changes the sign without a serious loss. The final polarization at 12 GeV will be higher than 83% of the initial one at the injection energy of 0.5 GeV, if the vertical beam radius is 25 mm at the injection. This estimation includes a polarization loss of 7% due to the influence of synchrotron oscillation. (author)

  9. Longitudinal emittance control in high intensity proton synchrotrons

    International Nuclear Information System (INIS)

    Experiments of synchrotron injection using the direct fast chopped H- beam extracted from a surface-plasma-type H- ion source has been successfully achieved. The injection phase of the fast chopped beam from linac into the booster synchrotron is adjustable to the center of rf bucket by using this beam. It was obtained that the longitudinal emittance was controlled at the extraction of the booster synchrotron, and that the beam loss during the injection into main ring of the KEK-PS was reduced by this fast chopped beam. (author)

  10. AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN

    CERN Document Server

    Gschwendtner, E; Amorim, L.; Apsimon, R.; Assmann, R.; Bachmann, A.M.; Batsch, F.; Bauche, J.; Olsen, V.K. Berglyd; Bernardini, M.; Bingham, R.; Biskup, B.; Bohl, T.; Bracco, C.; Burrows, P.N.; Burt, G.; Buttenschon, B.; Butterworth, A.; Caldwell, A.; Cascella, M.; Chevallay, E.; Cipiccia, S.; Damerau, H.; Deacon, L.; Dirksen, P.; Doebert, S.; Dorda, U.; Farmer, J.; Fedosseev, V.; Feldbaumer, E.; Fiorito, R.; Fonseca, R.; Friebel, F.; Gorn, A.A.; Grulke, O.; Hansen, J.; Hessler, C.; Hofle, W.; Holloway, J.; Huther, M.; Jaroszynski, D.; Jensen, L.; Jolly, S.; Joulaei, A.; Kasim, M.; Keeble, F.; Li, Y.; Liu, S.; Lopes, N.; Lotov, K.V.; Mandry, S.; Martorelli, R.; Martyanov, M.; Mazzoni, S.; Mete, O.; Minakov, V.A.; Mitchell, J.; Moody, J.; Muggli, P.; Najmudin, Z.; Norreys, P.; Oz, E.; Pardons, A.; Pepitone, K.; Petrenko, A.; Plyushchev, G.; Pukhov, A.; Rieger, K.; Ruhl, H.; Salveter, F.; Savard, N.; Schmidt, J.; Seryi, A.; Shaposhnikova, E.; Sheng, Z.M.; Sherwood, P.; Silva, L.; Soby, L.; Sosedkin, A.P.; Spitsyn, R.I.; Trines, R.; Tuev, P.V.; Turner, M.; Verzilov, V.; Vieira, J.; Vincke, H.; Wei, Y.; Welsch, C.P.; Wing, M.; Xia, G.; Zhang, H.

    2015-01-01

    The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world's first proton driven plasma wakefield acceleration experiment. The AWAKE experiment will be installed in the former CNGS facility and uses the 400 GeV/c proton beam bunches from the SPS. The first experiments will focus on the self-modulation instability of the long (rms ~12 cm) proton bunch in the plasma. These experiments are planned for the end of 2016. Later, in 2017/2018, low energy (~15 MeV) electrons will be externally injected to sample the wakefields and be accelerated beyond 1 GeV. The main goals of the experiment will be summarized. A summary of the AWAKE design and construction status will be presented.

  11. AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN

    Science.gov (United States)

    Gschwendtner, E.; Adli, E.; Amorim, L.; Apsimon, R.; Assmann, R.; Bachmann, A.-M.; Batsch, F.; Bauche, J.; Berglyd Olsen, V. K.; Bernardini, M.; Bingham, R.; Biskup, B.; Bohl, T.; Bracco, C.; Burrows, P. N.; Burt, G.; Buttenschön, B.; Butterworth, A.; Caldwell, A.; Cascella, M.; Chevallay, E.; Cipiccia, S.; Damerau, H.; Deacon, L.; Dirksen, P.; Doebert, S.; Dorda, U.; Farmer, J.; Fedosseev, V.; Feldbaumer, E.; Fiorito, R.; Fonseca, R.; Friebel, F.; Gorn, A. A.; Grulke, O.; Hansen, J.; Hessler, C.; Hofle, W.; Holloway, J.; Hüther, M.; Jaroszynski, D.; Jensen, L.; Jolly, S.; Joulaei, A.; Kasim, M.; Keeble, F.; Li, Y.; Liu, S.; Lopes, N.; Lotov, K. V.; Mandry, S.; Martorelli, R.; Martyanov, M.; Mazzoni, S.; Mete, O.; Minakov, V. A.; Mitchell, J.; Moody, J.; Muggli, P.; Najmudin, Z.; Norreys, P.; Öz, E.; Pardons, A.; Pepitone, K.; Petrenko, A.; Plyushchev, G.; Pukhov, A.; Rieger, K.; Ruhl, H.; Salveter, F.; Savard, N.; Schmidt, J.; Seryi, A.; Shaposhnikova, E.; Sheng, Z. M.; Sherwood, P.; Silva, L.; Soby, L.; Sosedkin, A. P.; Spitsyn, R. I.; Trines, R.; Tuev, P. V.; Turner, M.; Verzilov, V.; Vieira, J.; Vincke, H.; Wei, Y.; Welsch, C. P.; Wing, M.; Xia, G.; Zhang, H.

    2016-09-01

    The Advanced Proton Driven Plasma Wakefield Acceleration Experiment (AWAKE) aims at studying plasma wakefield generation and electron acceleration driven by proton bunches. It is a proof-of-principle R&D experiment at CERN and the world's first proton driven plasma wakefield acceleration experiment. The AWAKE experiment will be installed in the former CNGS facility and uses the 400 GeV/c proton beam bunches from the SPS. The first experiments will focus on the self-modulation instability of the long (rms ~12 cm) proton bunch in the plasma. These experiments are planned for the end of 2016. Later, in 2017/2018, low energy (~15 MeV) electrons will be externally injected into the sample wakefields and be accelerated beyond 1 GeV. The main goals of the experiment will be summarized. A summary of the AWAKE design and construction status will be presented.

  12. Status of the anti-proton production beam in the CERN PS

    International Nuclear Information System (INIS)

    A new scheme was put into operation in November 1988 to upgrade the proton beam delivered by the 26 GeV Proton Synchrotron (PS) for anti-proton production. It makes use of quasi-adiabatic manipulations of the RF parameters to squeeze a beam filling 1/2 of the PS circumference into a 1/4 turn and can in theory preserve the longitudinal emittance. A maximum intensity of 1.68 e13 ppp in 5 bunches at 26 GeV has been reached in the course of 22 weeks of operation. The limitations of the performance are analysed together with possible improvements. (author) 6 refs., 9 figs

  13. La neutrino factory del CERN e i problemi radiologici dell'annesso proton driver

    CERN Document Server

    Bressan, Beatrice Alessandra

    2001-01-01

    The thesis, La Neutrino Factory del CERN e i problemi radiologici dell’annesso proton driver (CERN Neutrino Factory and the radiological problems of the annex proton driver), deals with the new particle accelerators for the post LHC (Large Hadron Collider) era. The first part of the work describes these innovative accelerators with particular emphasis on the muon collider which, producing μ+/μ− collisions in the 100 GeV energy range, should explore deeply the Higgs Boson physics. The second part of the thesis describes the three-step scenario proposed for the muon accelerators: Neutrino Factory, Higgs Factory and a collider with TeV C.M. energy. The third chapter explains how a Neutrino Factory works. In a Neutrino Factory the neutrino beam is generated by high-energy muons decaying in a storage ring. The muons are produced by pions generated in a target bombarded by an intense proton beam. In the CERN project, the proton beam is produced by a super conducting LINAC (with 75 Hz frequency and 2.2 GeV ene...

  14. ELENA: the extra low energy anti-proton facility at CERN

    CERN Document Server

    Maury, Stephan; Bartmann, Wolfgang; Belochitskii, Pavel; Breuker, Horst; Butin, Francois; Carli, Christian; Eriksson, Tommy; Pasinelli, Sergio; Tranquille, Gerard

    2014-01-01

    At the last LEAP conference in Vancouver 2011 the authors stated that a project ”ELENA”, as an abbreviation for Extra Low ENergy Antiproton ring and as first discussed in 1982 for LEAR by H. Herr et al., was freshly proposed with a substantial new design and revised layout and that it was under consideration to be built at CERN. ELENA is an upgrade of the Anti-proton Decelerator (AD) at CERN and is devoted to special experiments with physics using low energy anti-protons. The main topics are the anti-hydrogen production and consecutive studies of the features of this anti-matter atom as well as the anti-proton nucleon interaction by testing the QED to high precision. During the last years the project underwent several steps in presentations at different committees at CERN and was finally approved such that the construction has started. ELENA will increase the number of useful anti-protons by about two orders of magnitude and will allow to serve up to four experiments simultaneously. Very first and convinc...

  15. CERN OVERVIEW animation

    CERN Multimedia

    Arzur Catel Torres

    2015-01-01

    This animation shows how the Large Hadron Collider (LHC) works. The film begins with an aerial view of CERN near Geneva, with outlines of the accelerator complex, including the underground Large Hadron Collider (LHC), 27-km in circumference. The positions of the four largest LHC experiments, ALICE, ATLAS, CMS and LHCb are revealed before we see protons travelling around the LHC ring. The proton source is a simple bottle of hydrogen gas. An electric field is used to strip hydrogen atoms of their electrons to yield protons. Linac 2, the first accelerator in the chain, accelerates the protons to the energy of 50 MeV. The beam is then injected into the Proton Synchrotron Booster (PSB), which accelerates the protons to 1.4 GeV, followed by the Proton Synchrotron (PS), which pushes the beam to 25 GeV. Protons are then sent to the Super Proton Synchrotron (SPS) where they are accelerated to 450 GeV. The protons are finally transferred to the two beam pipes of the LHC. The beam in one pipe circulates clockwise while ...

  16. A Proton-Driven Plasma Wakefield Acceleration experiment at CERN

    CERN Multimedia

    The AWAKE Collaboration has been formed in order to demonstrate protondriven plasma wakefield acceleration for the first time. This technology could lead to future colliders of high energy but of a much reduced length compared to proposed linear accelerators. The SPS proton beam in the CNGS facility will be injected into a 10m plasma cell where the long proton bunches will be modulated into significantly shorter micro-bunches. These micro-bunches will then initiate a strong wakefield in the plasma with peak fields above 1 GV/m that will be harnessed to accelerate a bunch of electrons from about 20MeV to the GeV scale within a few meters. The experimental program is based on detailed numerical simulations of beam and plasma interactions. The main accelerator components, the experimental area and infrastructure required as well as the plasma cell and the diagnostic equipment are discussed in detail. First protons to the experiment are expected at the end of 2016 and this will be followed by an initial 3–4 yea...

  17. The magnets for extraction from the KEK proton synchrotron main ring

    International Nuclear Information System (INIS)

    Fast extraction from the KEK proton synchrotron main ring started at December 1976 and ended at June 1981 with ending the experiments to use the KEK 1m Bubble Chamber. On the other hand, slow extraction from the KEK proton synchrotron main ring started at November 1977 and the first stage on the slow extraction ended at May 1990 with changing the flat-top duration from about 0.65 second to about 2 second. We made most magnets for extraction from the KEK proton synchrotron main ring, but we don't report about these magnets until now. As we think that compiling the materials of the extraction's magnets is useful, we publish this report. (author)

  18. RF acceleration system for 3 GeV proton synchrotron in JAERI-KEK joint project

    International Nuclear Information System (INIS)

    RF acceleration system for 3 GeV proton synchrotron in Joint JAERI-KEK high intensity proton accelerator project is described. In this synchrotron, since 8.3 x 1013 protons must be accelerated from 400 MeV to 3 GeV within 20 ms, wide-band frequency range and high accelerating voltage are required, and the system must be stable under heavy beam loading. From the results of R and D works over the past several years, high gradient rf cavity loaded with Magnetic Alloy and 1.2 MW class push-pull tetrode tube amplifier will be chosen for this system. Their design and R and D works for this synchrotron are reported. Furthermore, since longitudinal beam emittance will be controlled at injection and extraction by the rf manipulation because of alleviation of space charge effect, some simulation results for longitudinal motion by a particle tracking code are reported. (author)

  19. From the CERN web: antihydrogen, ROOT, protons and more

    CERN Multimedia

    2015-01-01

    This section highlights articles, blog posts and press releases published in the CERN web environment over the past weeks. This way, you won’t miss a thing...   A top quark candidate in the CMS detector. (Image: CMS Collaboration). Where no-one has gone before 30 September – CMS Collaboration Born at the end of the ’70s, I was still in school when the heaviest of all quarks was discovered at the Tevatron: the top quark. Back then I had no idea what it was about. But reading an article in the newspaper I felt the excitement surrounding such a discovery. My interest for the smallest and most basic building blocks of the universe had been awakened. When I joined the CMS Collaboration in 2014, I had no doubt that the first measurement I would like to do was that of the production rates of top-quark pairs at the new energy regime of 13 TeV. Shortly after the restart of the LHC in summer this year, we began a journey where no-one has gone before. Continue...

  20. Pion Production from Proton Synchrotron Radiation under Strong Magnetic Field in Relativistic Quantum Approach

    Directory of Open Access Journals (Sweden)

    Maruyama Tomoyuki

    2016-01-01

    Full Text Available We study pion production from proton synchrotron radiation in the presence of strong magnetic fields by using the exact proton propagator in a strong magnetic field and explicitly including the anomalous magnetic moment. Results in this exact quantum-field approach do not agree with those obtained in the semi-classical approach. Furthermore, we also find that the anomalous magnetic moment of the proton greatly enhances the production rate about by two orders of magnitude, and that the polar angle of an emitted pion is the same as that of an initial proton.

  1. Response of combined albedo-track neutron personnel dosimeters behind IHEP proton synchrotron shielding

    International Nuclear Information System (INIS)

    The method of readings interpretation of combined albedo-track neutron personnel dosemeters based on calculationsl analysis of the detector responses in various neutron spectra is described. The measurements of dose equivalent responses have been performed in various points behind IHEP proton synchrotron shielding. It is shown that CDs with fission track detectors have a small dose equivalent response dispersion behind IHEP proton synchrotron shielding, that shows the promise of their using for neutron personnel monitoring, that shows the promise of their using for neutron personnel monitoring at high energy accelerators. 16 refs.; 7 figs.; 3 tabs

  2. Proton Synchrotron Radiation from Extended Jets of PKS 0637-752 and 3C 273

    OpenAIRE

    Bhattacharyya, Wrijupan; Gupta, Nayantara

    2015-01-01

    Recently, the IC/CMB X-ray mechanism has been strongly disfavoured for 3C 273 and PKS 0637-752 since the anomalously hard and steady gamma-ray emission predicted by such models violates the observational results from Fermi-LAT. Here we propose the proton synchrotron origin of the X ray-gamma ray flux from the knots of PKS 0637-752 with a reasonable budget in luminosity, by considering synchrotron radiation from an accelerated proton population. Moreover, for the source 3C 273, some of the opt...

  3. Transverse momentum spectra for charged particles at the CERN proton-antiproton collider

    International Nuclear Information System (INIS)

    We have measured transverse momentum spectra up to 10 GeV/c for charged particles produced centrally in proton-antiproton collisions at 540 GeV in the centre of mass at the CERN collider. Our results are compared with data at ISR energies and with the predictions of a QCD model. The charged particle spectrum shows a clear dependence on charged track multiplicity. (orig.)

  4. RF system of a synchrotron for protons and heavy ions

    International Nuclear Information System (INIS)

    In this paper the potential and the constraints of producing many kilovolts of rf accelerating voltage for synchrotrons in a cumbersome board frequency range are reviewed from the electrical engineering standpoint. This paper elaborates on numbers and limits which determine cost and complexity of the rf system. (orig./HSI)

  5. Beam Tests and Plans for the CERN PS Transverse Damper System

    CERN Document Server

    Blas, A; Sterbini, G

    2013-01-01

    The CERN Proton Synchrotron (CPS) has been running without any transverse damping equipment since 1998, thanks to the stabilizing effect of the linear coupling applied between horizontal and vertical planes. \

  6. The design study for a 500 MeV proton synchrotron with CSNS linac as an injector

    CERN Document Server

    Huang, Liang-Sheng; Ji, Hong-Fei

    2016-01-01

    Using the China Spallation Neutron Source (CSNS) linac as the injector, a 500 MeV proton synchrotron is proposed for multidisciplinary application, such as biology, material and proton therapy. The synchrotron will deliver proton beam with energy from 80 MeV to 500 MeV. A compact lattice design was worked out, and all the important beam dynamics issues were investigated. The 80 MeV H- beam is stripped and injected into the synchrotron by using multi-turn injection. In order to continuously extraction the proton with small beam loss, the achromatic structure is proposed and slow extraction method with RF knock-out is adopted and optimized.

  7. Cern

    CERN Multimedia

    2009-01-01

    "La réparation de l'accélérateur géant de particules LHC, qui devrait redémarrer mi-novembre aprés une panne de plus d'un an, a coûté 23 millions d'euros, selon un haut responsable du Centre européen de recherche nucléaire (CERN), cité vendredi par les médias espagnols" (1 paragraph)

  8. Radiation doses on the ring magnet of the 70 GeV proton synchrotron

    International Nuclear Information System (INIS)

    The results on measurement and calculation of radiation doses on the blocks of the ring magnet of the IHEP 70 GeV proton synchrotron and regimes of its operation from 1976 to 1990 are presented. 22 refs.; 201 figs.; 1 tab

  9. Fast neutron dosimetry for radioprotection near large accelerators. Application to the proton synchrotron Saturne

    International Nuclear Information System (INIS)

    Methods are described that are used for the measurement of a neutron flux, and of the corresponding energy flux and dose absorbed. The methods are checked experimentally by the use of neutron sources of known energy distribution. The conditions of use of a proportional counter for recoil protons are described. The experimental results obtained with the synchrotron SATURNE at Saclay are described. (author)

  10. Proton synchrotron radiation of large-scale jets in active galactic nuclei

    OpenAIRE

    Aharonian, F. A.

    2001-01-01

    I propose a new mechanism for explanation of nonthernal X-ray emission of large-scale AGN jets. Namely, I assume that this radiation has synchrotron origin emitted by extremely high energy protons, and discuss implications of this model for several prominent hot spots and knots resolved by Chandra in Pictor A, 3C 120, PKS 0637-752, 3C 273.

  11. The optimization for the conceptual design of a 300 MeV proton synchrotron

    CERN Document Server

    An, Yuwen; Wang, Sheng; Huang, Liangsheng

    2016-01-01

    A research complex for aerospace radiation effects research has been proposed in Harbin Institute of Technology. Its core part is a proton accelerator complex, which consists of a 10 MeV injector, a 300 MeV synchrotron and beam transport lines. The proton beam extracted from the synchrotron is utilized for the radiation effects research. Based on the conceptual design [1], the design study for optimizing the synchrotron has been done. A new lattice design was worked out, and the multi-turn injection and slow extraction system were optimized with the new lattice design. In order to improve the time structure of the extracted beam, a RF knock-out method is employed. To meet the requirement of accurate control of dose, the frequency of the RF kicker is well investigated.

  12. Experimental tests of an advanced proton-to-neutron converter at ISOLDE-CERN

    CERN Document Server

    Gottberg, A; Luis, R; Ramos, J P; Seiffert, C; Cimmino, S; Marzari, S; Crepieux, B; Manea, V; Wolf, R N; Wienholtz, F; Kreim, S; Fedosseev, V N; Marsh, B A; Rothe, S; Vaz, P; Marques, J G; Stora, T

    2014-01-01

    The suppression of isobaric contaminations is of growing importance for many scientific programs using radioactive isotopes produced at isotope separation on-line (ISOL) facilities, such as ISOLDE-CERN. A solid tungsten proton-to-neutron converter has been used for ten years to produce neutron-rich fission fragments from an UC x target while suppressing the production of neutron-deficient isobaric contaminants. The remaining contamination is mainly produced by primary protons that are scattered by the heavy neutron converter and finally impinge on the UC x target itself. Therefore, the knowledge of the energy-dependant cross-sections of proton and neutron induced fission events is crucial in order to evaluate future converter concepts.

  13. Pion Production from Proton Synchrotron Radiation under Strong Magnetic Field in a Relativistic Quantum Approach

    Directory of Open Access Journals (Sweden)

    Maruyama Tomoyuki

    2016-01-01

    Full Text Available We study pion production from proton synchrotron radiation in the presence of strong magnetic fields by using the exact proton propagator in a strong magnetic field and explicitly including the anomalous magnetic moment. Results in this exact quantum approach do not agree with those obtained in the semi-classical approach. Then, we find that the anomalous magnetic moment of the proton greatly enhances the production rate by about two orders magnitude, and that the decay width satisfies a robust scaling law.

  14. Tracking protons in an FFAG and a synchrotron with tiny arcs

    International Nuclear Information System (INIS)

    We study a ray tracing method that uses tiny arcs to track a proton through a magnetic field. We show how to apply this to an FFAG and a synchrotron that are designed for cancer therapy. Assuming that the field traversed by a proton is uniform over each time step, the required equations and a simple scheme for treating a lattice are developed. We compare the computation time with the code Zgoubi for a FODO lattice. To test its usefulness, it is applied to the spiral FFAG, designed in the RACCAM project, to find the horizontal phase space trajectories. It is also applied to a compact synchrotron, designed in Japan, to determine the phase space trajectories during slow extraction of the proton beam.

  15. Experiments at CERN in 1979

    International Nuclear Information System (INIS)

    The 1979 catalogue of approved experiments at CERN has been compiled as a guide to the status of the experimental research programme at the 400 GeV Proton Synchrotron (SPS), the Intersecting Storage Rings (ISR), the 25 GeV Proton Synchrotron (PS), and the Synchrocyclotron (SC). The schematic layouts of beams and experiments at the various machines are given in the beginning of the report and are followed by descriptive material on the experiments. In general, a short summary of each of the approved experiments is given, with a description of the physics purpose, the apparatus employed, a list of the participants and the name of the collaboration. (Auth.)

  16. Study of beam parameters of the CERN proton linac using a three dimensional bunch shape monitor

    International Nuclear Information System (INIS)

    A Three Dimensional Bunch Shape Monitor (3D-BSM) has been developed for the CERN Proton Linac 2. A new area for beam studies at high intensities has been opened by this detector. Bunch density distributions in all three dimensions and their variations along the beam pulse can be obtained. Changing field gradients in linac quadrupoles, emittance variation along the bunch has been calculated. Measurements of beam halos become possible thanks to the large dynamic range of the device. Beam parameters at various linac settings have been measured and analysed. (author)

  17. Study of beam parameters of the CERN proton linac using a three dimensional bunch shape monitor

    CERN Document Server

    Feschenko, A V; Ostroumov, P N; Dubois, O; Haseroth, H; Hill, C; Kugler, H; Lombardi, A M; Naito, F; Tanke, E; Vretenar, Maurizio

    1996-01-01

    A Three Dimensional Bunch Shape Monitor (3D-BSM) has been developed for the CERN Proton Linac 2. A new area for beam studies at high intensities has been opened by this detector. Bunch density distributions in all three dimensions and their variations along the beam pulse can be obtained. Changing field gradients in linac quadrupoles, emittance variation along the bunch has been calculated. Measurements of beam halos become possible thanks to the large dynamic range of the device. Beam parameters at various linac settings have been measured and analysed.

  18. Status of the proton and electron transfer lines for the AWAKE Experiment at CERN

    Science.gov (United States)

    Schmidt, J. S.; Bauche, J.; Biskup, B.; Bracco, C.; Doebert, S.; Goddard, B.; Gschwendtner, E.; Jensen, L. K.; Jones, O. R.; Mazzoni, S.; Meddahi, M.; Pepitone, K.; Petrenko, A.; Velotti, F. M.; Vorozhtsov, A.

    2016-09-01

    The AWAKE project at CERN is planned to study proton driven plasma wakefield acceleration with an externally injected electron beam. Therefore two transfer lines are being designed in order to provide the proton beam from the SPS and the electron beam from an RF gun to the plasma cell. The commissioning of the proton line will take place in 2016 for the first phase of the experiment, which is focused on the self-modulation of a 12 cm long proton bunch in the plasma. The electron line will be added for the second phase of AWAKE in 2017, when the wakefield will be probed with an electron beam of 10-20 MeV/c. The challenge for these transfer lines lies in the parallel operation of the proton, electron and laser beam used to ionize the plasma and seed the self-modulation. These beams, of different characteristics, need to be synchronized and positioned for optimized injection conditions into the wakefield. This task requires great flexibility in the transfer line optics. The status of these designs will be presented in this paper.

  19. Prospects of warm dense matter research at HiRadMat facility at CERN using 440 MeV SPS proton beam

    CERN Document Server

    Tahir, N A; Schmidt, R; Shutov, A; Piriz, A R

    2013-01-01

    In this paper we present numerical simulations of heating of a solid copper cylinder by the 440 GeV proton beam delivered by the Super Proton Synchrotron (SPS) at CERN. The beam is made of 288 proton bunches while each bunch comprises of 1.15$1011 so that the total number of protons in the beam is about 1.3$1013. The bunch length is 0.5 ns while two neighboring bunches are separated by 25 ns so that the beam duration is 7.2 ms. Particle intensity distribution in the transverse direction is a Gaussian and the beam can be focused to a spot size with s 1⁄4 0.1 mme1.0 mm. In this paper we present results using two values of s, namely 0.2 mm and 0.5 mm, respectively. The target length is 1.5 m with a radius 1⁄4 5 cm and is facially irradiated by the beam. The energy deposition code FLUKA and the two-dimensional hydrodynamic code BIG2 are employed using a suitable iteration time to simulate the hydrodynamic and the thermodynamic response of the target. The primary purpose of this work was to design fixed target...

  20. Measurement and calculation of betatron frequency in synchrotron of proton beam therapy

    International Nuclear Information System (INIS)

    Downsizing is necessary for the spread of proton therapy. We developed a compact synchrotron for system downsizing. The new synchrotron has a four-folding symmetric lattice, and its circumference is 18m. This synchrotron has the quadrupole magnets of the single system, which change betatron frequency between injection and extraction. Under this operation scheme, it is necessary to put betatron frequency, determined by edge focus of bending magnets, in ±0.01 ranges. Therefore, the bending magnet shape was determined by three-dimensional magnetic field calculation and particle-tracking. As result, measured betatron frequency at flattop became the difference of less than 0.01 for designed value. And, stable injection, acceleration and extraction were realized. (author)

  1. Analysis of 440 GeV proton beam-matter interaction experiments at the High Radiation Materials test facility at CERN

    Science.gov (United States)

    Burkart, F.; Schmidt, R.; Raginel, V.; Wollmann, D.; Tahir, N. A.; Shutov, A.; Piriz, A. R.

    2015-08-01

    In a previous paper [Schmidt et al., Phys. Plasmas 21, 080701 (2014)], we presented the first results on beam-matter interaction experiments that were carried out at the High Radiation Materials test facility at CERN. In these experiments, extended cylindrical targets of solid copper were irradiated with beam of 440 GeV protons delivered by the Super Proton Synchrotron (SPS). The beam comprised of a large number of high intensity proton bunches, each bunch having a length of 0.5 ns with a 50 ns gap between two neighboring bunches, while the length of this entire bunch train was about 7 μs. These experiments established the existence of the hydrodynamic tunneling phenomenon the first time. Detailed numerical simulations of these experiments were also carried out which were reported in detail in another paper [Tahir et al., Phys. Rev. E 90, 063112 (2014)]. Excellent agreement was found between the experimental measurements and the simulation results that validate our previous simulations done using the Large Hadron Collider (LHC) beam of 7 TeV protons [Tahir et al., Phys. Rev. Spec. Top.--Accel. Beams 15, 051003 (2012)]. According to these simulations, the range of the full LHC proton beam and the hadronic shower can be increased by more than an order of magnitude due to the hydrodynamic tunneling, compared to that of a single proton. This effect is of considerable importance for the design of machine protection system for hadron accelerators such as SPS, LHC, and Future Circular Collider. Recently, using metal cutting technology, the targets used in these experiments have been dissected into finer pieces for visual and microscopic inspection in order to establish the precise penetration depth of the protons and the corresponding hadronic shower. This, we believe will be helpful in studying the very important phenomenon of hydrodynamic tunneling in a more quantitative manner. The details of this experimental work together with a comparison with the numerical

  2. H$^{-}$ painting injection system for the JKJ 3 GeV high-intensity proton synchrotron

    CERN Document Server

    Sakai, I; Irie, Y; Ishi, Y; Machida, S; Noda, F; Shigaki, K; Shimada, T; Sugai, I; Takeda, Y; Watanabe, Y; Yamamoto, K

    2002-01-01

    The JAERI KEK Joint Project 3 GeV proton synchrotron is designed to accelerate 8.3*l0/sup 13/ protons per pulse at a 25 Hz repetition rate. The incoming beam emittance of the 400 MeV linac is 4 pi .mm.mrad and the acceptance in the 3 GeV synchrotron is 324 pi .mm.mrad in both the horizontal and vertical planes. Painting injection is designed to realize a uniform distribution of charged particles in real space. The bump orbit for painting injection is designed to have a full acceptance of the circulating orbit through the injection period. A full-acceptance bump orbit will enable both correlated and anticorrelated painting injection. (4 refs).

  3. Study on alumina-alumina brazing for application in vacuum chambers of proton synchrotron

    International Nuclear Information System (INIS)

    The paper describes an experimental study to standardize vacuum brazing process to obtain satisfactory high purity alumina brazed joints for application in rapid cycle proton synchrotron machine. Two different brazing routes, adopted for making alumina-alumina brazed joints, included (i) multi-step Mo-Mn metallization and brazing with BVAg-8 alloy and (ii) advanced single-step active brazing with CuSil-ABA alloy. Brazed alumina specimens, prepared by both the routes, yielded ultra high vacuum compatible, helium leak tight and bakeable joints. Active-brazed specimens exhibited satisfactory strength values in tensile and four-point bend tests. Metallized-brazed specimens, although exhibited relatively lower tensile strength than the targeted value, displayed satisfactory flexural strength in four-point bend test. The results of the study demonstrated that active brazing is the simple and cost effective alternative to conventional metallization route for producing satisfactory brazed joints for application in rapid cycle proton synchrotron machine. (author)

  4. Neutron field characterisation in a high-energy proton-synchrotron environment using bubble detectors

    International Nuclear Information System (INIS)

    During the beam adjustment of high energy accelerator facilities, a significant number of energetic particles impinge on the internal wall of the vacuum chamber thereby causing the production of intense parasitic radiation field, resulting in a short-term radiation exposure to personnel as well as interference in the operation of accelerator instrumentation systems usually based on sophisticated microelectronics. High-energy particle accelerators operate in pulsed mode; therefore, commercially available, general purpose radiation detectors for health physics activities are unsuitable for the assessment of such radiation field due to 'pulse pile-up' effects. Hence, we have used passive neutron dosimeters, i.e. temperature compensated superheated emulsion (bubble) detectors of types BDPND and BDT, to evaluate the neutron fluence at three selected locations of the 7.6 GeV proton synchrotron operated by DESY: (a) the 1.2-m thick concrete shielding roof of the experiment hall housing the proton synchrotron, (b) the 0.9-m thick shielding roof of the proton injector hut, and (c) at the lateral wall (2.5 m concrete and earth shielding) of the experiment hall, facing the proton injector delivering 7.6 GeV protons into the PETRA booster ring

  5. Study of an energy upgrade of the CERN PS Booster

    CERN Document Server

    Hanke, K; Angoletta, M E; Bartmann, W; Bartolome, S; Bertone, C; Blas, A; Borburgh, J; Bozzini, D; Butterworth, A; Carli, C; Dahlen, P; Dobers, T; Findlay, A; Folch, R; Gilbert, N; Hansen, J; Hermanns, T; Jensen, S; Le Roux, P; Lopez-Hernandez, L A; Mahner, E; Masi, A; Mikulec, B; Muttoni, Y; Newborough, A; Nisbet, D; Nonis, M; Olek, S; Paoluzzi, M; Pittet, S; Puccio, B; Raginel, V; Ruehl, I; Tan, J; Todd, B; Weterings, W; Widorski, W

    2011-01-01

    CERN’s LHC injector chain will have to deliver beams with ultimate brilliance as the LHC is heading for increased luminosity in the coming years. In order to overcome bottlenecks in the injector chain, an increase of the beam transfer energy from the CERN Proton Synchrotron Booster (PSB) to the Proton Synchrotron (PS) has been investigated as a possible upgrade scenario. This paper gives an overview of the technical solutions and summarizes the conclusions of the feasibility study.

  6. Electron cloud in the CERN accelerators (PS, SPS, LHC)

    OpenAIRE

    Iadarola, G.; Rumolo, G.

    2013-01-01

    Several indicators have pointed to the presence of an Electron Cloud (EC) in some of the CERN accelerators, when operating with closely spaced bunched beams. In particular, spurious signals on the pick ups used for beam detection, pressure rise and beam instabilities were observed at the Proton Synchrotron (PS) during the last stage of preparation of the beams for the Large Hadron Collider (LHC), as well as at the Super Proton Synchrotron (SPS). Since the LHC has started operation in 2009, ty...

  7. Experimental tests of an advanced proton-to-neutron converter at ISOLDE-CERN

    Energy Technology Data Exchange (ETDEWEB)

    Gottberg, A. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); Consejo Nacional de Pesquisas Cientificas CSIC, Instituto de Estructura de la Materia, 28006 Madrid (Spain); Mendonca, T.M. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); IFIMUP and IN – Institut of Nanosciences and Nanotechnologies, Rua do Campo Alegre 687, 4169-007 Porto (Portugal); Luis, R. [Instituto Superior Técnico, Campus Tecnológico e Nuclear – IST-CTN, Estrada Nacional 10 (km 139, 7), 2695-066 Bobadela LRS (Portugal); Ramos, J.P. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); École Polytechnique Fédérale de Lausanne – EPFL, 1015 Lausanne (Switzerland); Seiffert, C. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); Technische Universität Darmstadt, 64289 Darmstadt (Germany); Cimmino, S.; Marzari, S.; Crepieux, B. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); Manea, V. [CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay (France); Wolf, R.N.; Wienholtz, F. [Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald (Germany); Kreim, S. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany); Fedosseev, V.N.; Marsh, B.A.; Rothe, S. [European Organization for Nuclear Research – CERN 1211, Geneva 23 (Switzerland); and others

    2014-10-01

    The suppression of isobaric contaminations is of growing importance for many scientific programs using radioactive isotopes produced at isotope separation on-line (ISOL) facilities, such as ISOLDE-CERN. A solid tungsten proton-to-neutron converter has been used for ten years to produce neutron-rich fission fragments from an UC{sub x} target while suppressing the production of neutron-deficient isobaric contaminants. The remaining contamination is mainly produced by primary protons that are scattered by the heavy neutron converter and finally impinge on the UC{sub x} target itself. Therefore, the knowledge of the energy-dependant cross-sections of proton and neutron induced fission events is crucial in order to evaluate future converter concepts. In this paper, an improved neutron converter prototype design is presented together with the experimentally assessed radioisotope production of Rb, Zn, Cu, Ga and In that validate the converter concept aiming at beams of higher purity neutron-rich isotopes. The experimentally derived release efficiencies for isotopes produced by the 1.4 GeV protons available at ISOLDE are used to evaluate the Monte Carlo code FLUKA and the cross-section codes TALYS and ABRABLA, respectively.

  8. Experimental tests of an advanced proton-to-neutron converter at ISOLDE-CERN

    International Nuclear Information System (INIS)

    The suppression of isobaric contaminations is of growing importance for many scientific programs using radioactive isotopes produced at isotope separation on-line (ISOL) facilities, such as ISOLDE-CERN. A solid tungsten proton-to-neutron converter has been used for ten years to produce neutron-rich fission fragments from an UCx target while suppressing the production of neutron-deficient isobaric contaminants. The remaining contamination is mainly produced by primary protons that are scattered by the heavy neutron converter and finally impinge on the UCx target itself. Therefore, the knowledge of the energy-dependant cross-sections of proton and neutron induced fission events is crucial in order to evaluate future converter concepts. In this paper, an improved neutron converter prototype design is presented together with the experimentally assessed radioisotope production of Rb, Zn, Cu, Ga and In that validate the converter concept aiming at beams of higher purity neutron-rich isotopes. The experimentally derived release efficiencies for isotopes produced by the 1.4 GeV protons available at ISOLDE are used to evaluate the Monte Carlo code FLUKA and the cross-section codes TALYS and ABRABLA, respectively

  9. Results from the CERN pilot CLOUD experiment

    DEFF Research Database (Denmark)

    Duplissy, J.; Enghoff, Martin Andreas Bødker; Aplin, K. L.;

    2009-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the CLOUD1 experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory...

  10. Study on vacuum brazing of high purity alumina for application in proton synchrotron

    International Nuclear Information System (INIS)

    Highlights: • Study compares Mo–Mn metallization and active brazing routes for joining alumina. • Targeted application: UHV chamber of proton synchrotron. • Both kinds of joints were UHV compatible with helium leak rate <1.1 × 10−10 mbar l/s. • Active brazed joints met tensile and flexural strength design requirement (>50 MPa). • Active brazing is a simpler and economical route for joining high purity alumina. - Abstract: The paper describes an experimental study to evaluate two different vacuum brazing processes to obtain high purity alumina (99.7%) joints suitable for application in rapid cycle proton synchrotron. Two different brazing routes, adopted for making alumina–alumina brazed joints, included (i) multi-step Mo–Mn metallization, followed by brazing with BVAg-8 alloy and (ii) advanced single-step active brazing with CuSil-ABA® alloy. Both the brazing routes yielded helium leak tight and ultra-high vacuum (pressure < 10−9 mbar) compatible joints. Active-brazed specimens exhibited tensile and mean flexural strengths of 62 and 110 MPa, respectively. Metallized-brazed specimens, although associated with relatively lower tensile strength (35 MPa) than the targeted value (>50 MPa), displayed higher mean flexural strength of 149 MPa. The results of the study demonstrated that active brazing is a simple and cost effective alternative to conventional multi-step metallization route for producing quality joints of high purity alumina for application in rapid cycle proton synchrotron machine

  11. Induced radioactivity of the IHEP proton synchrotron beam extraction equipment

    International Nuclear Information System (INIS)

    The measurement results of induced radioactivity of the beam extraction equipment during 1972-1978 are presented. All the values are given to the moment of the accelerator stop. The experimental data permits to predict further possible variations of the induced radioactivity levels of the equipment. Given are the measures required for reduction of the accelerator equipment irradiation, which are the following: 1) compensation of residual distortion of a closed beam orbit in the course of the induction system operation; 2) limitation of the intensity of drop on the internal targets up to the 11 protons per target level over a cycle; 3) putting into operation the program control system for the duration of a current pulse of a linear accelerator to minimize the beam residues at the 70 GeV energy during physical experiments; 4) construction of the system of beam interception and cutting-off to ensure effective energy suppression of uncontrolled beam residues and localization of their radiation effect; 5) extraction of a high-energy beam out of the accelerator during the experiments (e.g., into the neutrino channel for apparatus adjusting) instead of its dropping on the interceptor-target; 6) beam orbit controlling in the case of multiturn injection into the accelerator

  12. Aerial view of CERN under the snow

    CERN Multimedia

    1963-01-01

    In this photograph taken in the winter of 1963, CERN still looks quite bare under its mantle of snow. The Proton Synchrotron (PS), resembling a bicycle wheel in shape, had been in operation since the summer of 1959. A proposal had just been made for the site of CERN's second large project, the Intersecting Storage Rings (ISR): France was to house the world's first proton-proton collider. In September 1965, the French authorities signed an agreement making more than 40 hectares of land available for the extension of the CERN site established in Switzerland into French territory. The ISR project received final approval from the CERN Council in December 1965. The civil engineering work on the French part began in November 196

  13. A polarimeter for GeV protons of recirculating synchrotron beams

    CERN Document Server

    Bauer, F

    1999-01-01

    A polarimeter for use in recirculating beams of proton synchrotrons with energies from 300 MeV up to several GeV has been developed. The polarimetry is based on the asymmetry measurement of elastic p->p scattering on an internal CH sub 2 fiber target. The forward going protons are detected with two scintillator systems on either side of the beam pipe close to the angle THETA sub f of maximum analyzing power A sub N. Each one operates in coincidence with a broad (DELTA THETA sub b =21.4 deg. ), segmented detector system for the recoil proton of kinematically varying direction THETA sub b; this position resolution is also used for a concurrent measurement of the p->C and nonelastic p->p background. The CH sub 2 fiber can be replaced by a carbon fiber for detailed background studies; 'false' asymmetries are accounted for with a rotation of the polarimeter around the beam axis. Polarimetry has been performed in the internal beam of the Cooler Synchrotron COSY at fixed energies as well as during proton acceleratio...

  14. SPL-based Proton Driver for a nu-Factory at CERN

    CERN Document Server

    Benedetto, E; Garoby, R; Meddahi, M

    2010-01-01

    The conceptual design and feasibility studies for a nu-Factory Proton Driver based on the CERN Superconducting Proton Linac (SPL) have been com- pleted. In the proposed scenario, the 4 MW proton beam (H- beam) is acceler- ated with the upgraded High Power (HP)-SPL to 5 GeV, stored in an accumu- lator ring and Þnally transported to a compressor ring, where bunch rotation takes place, in order to achieve the speciÞc time structure. We here summa- rize the choices in terms of lattice, magnet technology and RF manipulations in the two rings. The possible critical issues, such as heating of the foil for the charge-exchange injection, space-charge problems in the compressor and beam stability in the accumulator ring, have been addressed and are shown not to be show-stoppers. The analysis focuses on the baseline scenario, consider- ing 6 bunches in the accumulator, and preliminary studies are discussed for the option of 3 or a single bunch per burst.

  15. CERN antiproton target: Hydrocode analysis of its core material dynamic response under proton beam impact

    Science.gov (United States)

    Martin, Claudio Torregrosa; Perillo-Marcone, Antonio; Calviani, Marco; Muñoz-Cobo, José-Luis

    2016-07-01

    Antiprotons are produced at CERN by colliding a 26 GeV /c proton beam with a fixed target made of a 3 mm diameter, 55 mm length iridium core. The inherent characteristics of antiproton production involve extremely high energy depositions inside the target when impacted by each primary proton beam, making it one of the most dynamically demanding among high energy solid targets in the world, with a rise temperature above 2000 °C after each pulse impact and successive dynamic pressure waves of the order of GPa's. An optimized redesign of the current target is foreseen for the next 20 years of operation. As a first step in the design procedure, this numerical study delves into the fundamental phenomena present in the target material core under proton pulse impact and subsequent pressure wave propagation by the use of hydrocodes. Three major phenomena have been identified, (i) the dominance of a high frequency radial wave which produces destructive compressive-to-tensile pressure response (ii) The existence of end-of-pulse tensile waves and its relevance on the overall response (iii) A reduction of 44% in tensile pressure could be obtained by the use of a high density tantalum cladding.

  16. The CERN antiproton target: hydrocode analysis of its core material dynamic response under proton beam impact

    CERN Document Server

    Martin, Claudio Torregrosa; Calviani, Marco; Muñoz-Cobo, José-Luis

    2016-01-01

    Antiprotons are produced at CERN by colliding a 26 GeV/c proton beam with a fixed target made of a 3 mm diameter, 55 mm length iridium core. The inherent characteristics of antiproton production involve extremely high energy depositions inside the target when impacted by each primary proton beam, making it one of the most dynamically demanding among high energy solid targets in the world, with a rise temperature above 2000 {\\deg}C after each pulse impact and successive dynamic pressure waves of the order of GPa's. An optimized redesign of the current target is foreseen for the next 20 years of operation. As a first step in the design procedure, this numerical study delves into the fundamental phenomena present in the target material core under proton pulse impact and subsequent pressure wave propagation by the use of hydrocodes. Three major phenomena have been identified, (i) the dominance of a high frequency radial wave which produces destructive compressive-to-tensile pressure response (ii) The existence of...

  17. Programmable extraction of different energy proton beam to an experimental facility in the process of injection into the IHEP synchrotron

    International Nuclear Information System (INIS)

    The programmable different energy proton beam extraction to an experimental facility of the IHEP under injection to the IHEP proton synchrotron is realized in the following way; after inquiry from the IHEP EF transfer to a lower extraction energy and beam extraction to EF are performed. 1 ref.; 1 fig

  18. Magnet power supply of a 3-GeV proton synchrotron for the JAERI/KEK joint project

    International Nuclear Information System (INIS)

    High intensity proton accelerator facility for the JAERI/KEK joint project is now under construction at the Tokai campus of JAERI. This paper presents a magnet power supply using a resonant network for the 3 GeV proton synchrotron. (author)

  19. Multiplicity and transverse momentum fluctuations in inelastic proton-proton interactions at the CERN Super Proton Synchrotron

    CERN Document Server

    Aduszkiewicz , A; Andronov, E.; Anticic, T.; Antoniou, N.; Baatar, B.; Bay, F.; Blondel, A.; Blumer, J.; Bogomilov, M.; Bravar, A.; Brzychczyk, J.; Bunyatov, S.A.; Busygina, O.; Christakoglou, P.; Cirkovic, M.; Czopowicz, T.; Davis, N.; Debieux, S.; Dembinski, H.; Deveaux, M.; Diakonos, F.; Di Luise, S.; Dominik, W.; Dumarchez, J.; Dynowski, K.; Engel, R.; Ereditato, A.; Feofilov, G.A.; Fodor, Z.; Garibov, A.; Gazdzicki, M.; Golubeva, M.; Grebieszkow, K.; Grzeszczuk, A.; Guber, F.; Haesler, A.; Hasegawa, T.; Herve, A.; Hierholzer, M.; Igolkin, S.; Ivashkin, A.; Kadija, K.; Kapoyannis, A.; Kaptur, E.; Kisiel, J.; Kobayashi, T.; Kolesnikov, V.I.; Kolev, D.; Kondratiev, V.P.; Korzenev, A.; Kowalik, K.; Kowalski, S.; Koziel, M.; Krasnoperov, A.; Kuich, M.; Kurepin, A.; Larsen, D.; Laszlo, A.; Lewicki, M.; Lyubushkin, V.V.; Mackowiak-Pawlowska, M.; Maksiak, B.; Malakhov, A.I.; Manic, D.; Marcinek, A.; Marton, K.; Mathes, H.-J.; Matulewicz, T.; Matveev, V.; Melkumov, G.L.; Morozov, S.; Mrowczynski, S.; Nakadaira, T.; Naskret, M.; Nirkko, M.; Nishikawa, K.; Panagiotou, A.D.; Pavin, M.; Petukhov, O.; Pistillo, C.; Planeta, R.; Popov, B.A.; Posiadala, M.; Pulawski, S.; Puzovic, J.; Rauch, W.; Ravonel, M.; Redij, A.; Renfordt, R.; Richter-Was, E.; Robert, A.; Rohrich, D.; Rondio, E.; Roth, M.; Rubbia, A.; Rustamov, A.; Rybczynski, M.; Sadovsky, A.; Sakashita, K.; Sarnecki, R.; Schmidt, K.; Sekiguchi, T.; Seryakov, A.; Seyboth, P.; Sgalaberna, D.; Shibata, M.; Slodkowski, M.; Staszel, P.; Stefanek, G.; Stepaniak, J.; Strobele, H.; Susa, T.; Szuba, M.; Tada, M.; Tefelska, A.; Tefelski, D.; Tereshchenko, V.; Tsenov, R.; Turko, L.; Ulrich, R.; Unger, M.; Vassiliou, M.; Veberic, D.; Vechernin, V.V.; Vesztergombi, G.; Vinogradov, L.; Wilczek, A.; Wlodarczyk, Z.; Wojtaszek-Szwarc, A.; Wyszynski, O.; Zambelli, L.

    2015-01-01

    Measurements of multiplicity and transverse momentum fluctuations of charged particles were performed in inelastic p+p interactions at 20, 31, 40, 80 and 158 GeV/c beam momentum. Results for the scaled variance of the multiplicity distribution and for three strongly intensive measures of multiplicity and transverse momentum fluctuations \\$\\Delta[P_{T},N]\\$, \\$\\Sigma[P_{T},N]\\$ and \\$\\Phi_{p_T}\\$ are presented. For the first time the results on fluctuations are fully corrected for experimental biases. The results on multiplicity and transverse momentum fluctuations significantly deviate from expectations for the independent particle production. They also depend on charges of selected hadrons. The string-resonance Monte Carlo models EPOS and UrQMD do not describe the data. The scaled variance of multiplicity fluctuations is significantly higher in inelastic p+p interactions than in central Pb+Pb collisions measured by NA49 at the same energy per nucleon. This is in qualitative disagreement with the predictions ...

  20. A three dimensional bunch shape monitor for the CERN proton linac

    International Nuclear Information System (INIS)

    The development, performance and test of the Three Dimensional Bunch Shape Monitor (3D-BSM) are presented. The principle of operation is based on the analysis of secondary electrons produced by a primary beam on a 0.1 mm tungsten wire to which a potential of -10 kV is applied. The horizontal particle distribution is provided by moving the wire across the primary beam. A horizontal slit located outside the primary beam area is moved vertically in order to analyse the secondary electron density distribution in the vertical direction. The longitudinal profile is measured as in the bunch length detector developed at INR earlier. The 3D-BSM has been installed and commissioned at the CERN proton linac. (author)

  1. A compact proton synchrotron based on a low emittance beam extraction scheme using transverse RF noise

    International Nuclear Information System (INIS)

    A compact proton synchrotron for cancer therapy is presented. In the synchrotron, a new operating scheme for resonant beam extraction is applied with a combined function lattice in order to realize small emittance of the extracted beam with simple control for the accelerator system. In the extraction, the amplitude of the betatron oscillations of the particles inside the separatrix is increased by a transverse RF noise with a narrow bandwidth. During the extraction, the separatrix is kept constant, that is, the magnet currents related to the resonance are kept constant. The emittance of the extracted beam can be kept lower than about 0.1πmm · mrad without dynamic control of the closed orbit. (author)

  2. Neutron spectra at the outlet from the labyrinths in the IHEP proton synchrotron biological shield

    International Nuclear Information System (INIS)

    Neutron spectra in transport and cable labyrinths of concrete shielding were measured. It was related with planned increase of proton beam intensity in the IHEP synchrotron and the necessity of searching isotope radiation sources suitable for simulation of fields of neutron radiation in the accelerator biological shield. Multisphere Bonner spectrometer with 6LiI(Eu) monocrystal of 10x10 mm size as thermal neutron detector and a set of seven cadmium-plated polyethylene thermalizing spheres 2, 3, 5, 8, 10, 12 and 18 inch in diameter was used for measurement. Measurements were conducted at 100 MeV, 8 and 70 GeV proton energies. Analysis of obtained data shows that the average energy of neutron spectra increases at the outlet from the labyrinths from 110 up to 390 keV with growth of accelerated proton energy from 100 MeV up to 70 GeV. Neutron spectra are similar with respect to form and component composition at one and the same energy of accelerated particles and the same shield material regardless of labyrinth configuration. The shares of fast and interiediate neutrons equal about 10 and 90% respectively. It was concluded that neutron radiation fields typical for the labyrinths of the IHEP synchrotron yield can be simulated in model labyrinths with the use of californium-252 source

  3. Design studies for a large proton-synchrotron and its laboratory

    CERN Document Server

    Adams, John Bertram

    1970-01-01

    Analysis of the growth pattern of CERN-Meyrin leads to a model for the development of the proposed European 300 GeV Laboratory. The model must allow for flexibility in the development of the machine so that one may exploit future technological advances, e.g. pulsed superconducting magnets. The maximum use must be made of existing capital investment and infrastructure yet provision must also be made for a steady expansion in experimental utilization for 30 years to come. Various types of synchrotron with separated and combined- function lattices and missing-magnet, missing-power and fixed-energy configurations have been designed and costed. Their relative merits are discussed in the context of the model for the new Laboratory.

  4. Parasitic slow extraction of extremely weak beam from a high-intensity proton rapid cycling synchrotron

    Energy Technology Data Exchange (ETDEWEB)

    Zou, Ye [University of Science and Technology of China, Hefei, Anhui 230029 (China); Institute of High Energy Physics, CAS, Yuquan Road 19B, Beijing 100049 (China); Tang, Jingyu, E-mail: tangjy@ihep.ac.cn [University of Science and Technology of China, Hefei, Anhui 230029 (China); Institute of High Energy Physics, CAS, Yuquan Road 19B, Beijing 100049 (China); Yang, Zheng; Jing, Hantao [Institute of High Energy Physics, CAS, Yuquan Road 19B, Beijing 100049 (China)

    2014-02-11

    This paper proposes a novel method to extract extremely weak beam from a high-intensity proton rapid cycling synchrotron (RCS) in the parasitic mode, while maintaining the normal fast extraction. The usual slow extraction method from a synchrotron by employing third-order resonance cannot be applied in a high-intensity RCS due to a very short flat-top at the extraction energy and the strict control on beam loss. The proposed parasitic slow extraction method moves the beam to scrape a scattering foil prior to the fast beam extraction by employing either a local orbit bump or momentum deviation or their combination, so that the halo part of the beam will be scattered. A part of the scattered particles will be extracted from the RCS and guided to the experimental area. The slow extraction process can last about a few milliseconds before the beam is extracted by the fast extraction system. The method has been applied to the RCS of China Spallation Neutron Source. With 1.6 GeV in the extraction energy, 62.5 μA in the average current and 25 Hz in the repetition rate for the RCS, the proton intensity by the slow extraction method can be up to 2×10{sup 4} protons per cycle or 5×10{sup 5} protons per second. The extracted beam has also a good time structure of approximately uniform in a spill which is required for many applications such as detector tests. Detailed studies including the scattering effect in the foil, the local orbit bump by the bump magnets and dispersive orbit bump by modifying the RF pattern, the multi-particle simulations by ORBIT and TURTLE codes, and some technical features for the extraction magnets are presented.

  5. Lattice for a 1. 1-GeV 500. mu. A fast-cycling proton synchrotron

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Y.

    1983-01-01

    A very-high-intensity proton synchrotron lattice has been designed for a spallation neutron-source system. The synchrotron is to accelerate a beam of 6.25 x 10/sup 13/ protons from 200 MeV to 1100 MeV in 15 msec. One of the important concerns for high-intensity, high-rep-rate (50 pulses/sec) machines is stability of the beam. Considerations of the transverse space-charge limits and the transverse-stability criterion favor a high-tune machine over a low-tune machine of the same circumference. For these reasons, we made the tune as high as possible by making the cell length as short as possible. The lattice proposed here consists of four sectors, and each sector is made up by three FODO normal cells, four dispersion suppressor cells, and four matching and straight section cells. Then the total of 44 cells with approximately 90/sup 0//cell phase advance would make the natural tune of the machine to be near 11.

  6. Experiments at CERN in 1997

    International Nuclear Information System (INIS)

    This book summarises the current experimental programme at CERN. The experiments listed are taking place at one of the following machines: the Large Electron Positron Collider (LEP), the Super Proton Synchroton (SPS), the 28 GeV Proton Synchrotron (PS), including the Antiproton Decelerator (AD) for slow antiprotons and the ISOLDE facility for short-lived ions. The three experiments now approved for installation at the Large Hadron Collider (LHC) and the R and D projects aimed at the development of new detector technologies and data acquisition systems for the LHC experiments are also listed. (orig./WL)

  7. 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)

  8. The CERN neutrino beam to Gran Sasso (NGS). Conceptual technical design

    International Nuclear Information System (INIS)

    The conceptual design of a new neutrino facility at CERN is presented. Starting with 400 GeV/c protons from the Super Proton Synchrotron (SPS), a neutrino beam is produced which is directed towards the underground Gran Sasso Laboratory in Italy, 732 km away from CERN, where large, complex detectors will allow long-baseline experiments searching for neutrino oscillation phenomena to be performed. (orig.)

  9. Update on Proton Driven Plasma Wakefield Acceleration

    CERN Document Server

    Xia, G; Lotov, K; Pukhov, A; Kumar, N; An, W; Lu, W; Mori, W B; Joshi, C; Huang, C; Muggli, P; Assmann, R; Zimmermann, F

    2010-01-01

    In this paper, the update of proton driven plasma wakefield acceleration (PDPWA) is given. After a brief introduction to the scheme of PDPWA, a future demonstration experiment is discussed. The particle-in-cell simulation results based on the realistic proton beams from the CERN Super Proton Synchrotron (SPS) are presented, followed by a simulation study of proton bunch compression. Presented at AAC’10, 13-19 June 2010, Annapolis, MD, USA

  10. Analysis of 440 GeV proton beam–matter interaction experiments at the High Radiation Materials test facility at CERN

    International Nuclear Information System (INIS)

    In a previous paper [Schmidt et al., Phys. Plasmas 21, 080701 (2014)], we presented the first results on beam–matter interaction experiments that were carried out at the High Radiation Materials test facility at CERN. In these experiments, extended cylindrical targets of solid copper were irradiated with beam of 440 GeV protons delivered by the Super Proton Synchrotron (SPS). The beam comprised of a large number of high intensity proton bunches, each bunch having a length of 0.5 ns with a 50 ns gap between two neighboring bunches, while the length of this entire bunch train was about 7 μs. These experiments established the existence of the hydrodynamic tunneling phenomenon the first time. Detailed numerical simulations of these experiments were also carried out which were reported in detail in another paper [Tahir et al., Phys. Rev. E 90, 063112 (2014)]. Excellent agreement was found between the experimental measurements and the simulation results that validate our previous simulations done using the Large Hadron Collider (LHC) beam of 7 TeV protons [Tahir et al., Phys. Rev. Spec. Top.--Accel. Beams 15, 051003 (2012)]. According to these simulations, the range of the full LHC proton beam and the hadronic shower can be increased by more than an order of magnitude due to the hydrodynamic tunneling, compared to that of a single proton. This effect is of considerable importance for the design of machine protection system for hadron accelerators such as SPS, LHC, and Future Circular Collider. Recently, using metal cutting technology, the targets used in these experiments have been dissected into finer pieces for visual and microscopic inspection in order to establish the precise penetration depth of the protons and the corresponding hadronic shower. This, we believe will be helpful in studying the very important phenomenon of hydrodynamic tunneling in a more quantitative manner. The details of this experimental work together with a comparison with the

  11. Analysis of 440 GeV proton beam–matter interaction experiments at the High Radiation Materials test facility at CERN

    Energy Technology Data Exchange (ETDEWEB)

    Burkart, F. [CERN-AB, 1211 Geneva 23, Switzerland and Goethe University, Frankfurt (Germany); Schmidt, R.; Wollmann, D. [CERN-AB, 1211 Geneva 23 (Switzerland); Raginel, V. [CERN-AB, 1211 Geneva 23, Switzerland and TU Vienna, Vienna (Austria); Tahir, N. A. [GSI Helmholtzzentrum für Schwerionenforschung, Planckstraße 1, 64291 Darmstadt (Germany); Shutov, A. [Institute of Problems of Chemical Physics, Chernogolovka (Russian Federation); Piriz, A. R. [E.T.S.I. Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real (Spain)

    2015-08-07

    In a previous paper [Schmidt et al., Phys. Plasmas 21, 080701 (2014)], we presented the first results on beam–matter interaction experiments that were carried out at the High Radiation Materials test facility at CERN. In these experiments, extended cylindrical targets of solid copper were irradiated with beam of 440 GeV protons delivered by the Super Proton Synchrotron (SPS). The beam comprised of a large number of high intensity proton bunches, each bunch having a length of 0.5 ns with a 50 ns gap between two neighboring bunches, while the length of this entire bunch train was about 7 μs. These experiments established the existence of the hydrodynamic tunneling phenomenon the first time. Detailed numerical simulations of these experiments were also carried out which were reported in detail in another paper [Tahir et al., Phys. Rev. E 90, 063112 (2014)]. Excellent agreement was found between the experimental measurements and the simulation results that validate our previous simulations done using the Large Hadron Collider (LHC) beam of 7 TeV protons [Tahir et al., Phys. Rev. Spec. Top.--Accel. Beams 15, 051003 (2012)]. According to these simulations, the range of the full LHC proton beam and the hadronic shower can be increased by more than an order of magnitude due to the hydrodynamic tunneling, compared to that of a single proton. This effect is of considerable importance for the design of machine protection system for hadron accelerators such as SPS, LHC, and Future Circular Collider. Recently, using metal cutting technology, the targets used in these experiments have been dissected into finer pieces for visual and microscopic inspection in order to establish the precise penetration depth of the protons and the corresponding hadronic shower. This, we believe will be helpful in studying the very important phenomenon of hydrodynamic tunneling in a more quantitative manner. The details of this experimental work together with a comparison with the

  12. NA61/SHINE facility at the CERN SPS: beams and detector system

    OpenAIRE

    Ereditato, Antonio; Hierholzer, Martin; Messina, Marcello; Nirkko, Martti; Pistillo, Ciro; Redij, Asmita Ajit; Rossi, Biagio

    2014-01-01

    NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North A...

  13. Expression of interest for nuclear/hadron physics experiments at the 50-GeV proton synchrotron

    International Nuclear Information System (INIS)

    Intention is expressed to pursue the physics of strongly interacting many-body systems at the planned 50-GeV Proton Synchrotron of the KEK/JHF and JAERI/NSP joint accelerator project. The richness of the field is emphasized and several possible experiments are discussed. In order to carry out these experiments, a multipurpose beam line is proposed which can transport protons, heavy ions, pions and other secondary particles of various energy with intensities from 109 to 1012 pps. (author)

  14. DDS signal acquisition and PI feedback algorithm design based on FPGA for RF system of the synchrotron for proton therapy

    International Nuclear Information System (INIS)

    In this paper,we report the configuration of frequency sweeping mode and PI feedback control in the low-level RF system of the proton synchrotron for proton therapy. Altera Stratix II FPGA and AD9858 are adopted to get the direct digital synthesizer (DDS) signal of frequency sweeping mode by compiling Verilog HDL code. A PI feedback algorithm is designed to control the amplitude and phase of cavity voltage, with high precision and stability. (authors)

  15. Control computer system for KEK 12 GeV proton synchrotron

    International Nuclear Information System (INIS)

    Control computer system for KEK proton synchrotron is described. The system is composed of 8 mini-computers; one is the central computer, one is the software development computer, and others are satellite computers. The central computer and others are connected with high-speed data transfer means. The satellite computers are distributed around the accelerator to shorten cable length between signal sources and computers. Data taken by the satellite computers are sent to the central computer. They are analyzed, displayed or printed out on various peripheral devices at the central control room, and used for accelerator control. The central computer monitors other computers and manages programs of the satellite computers. Programs for the satellite computers are generated on this computer and saved in disk files. The software development computer is used for compilation of source programs, for linking of object program modules, and for debugging of programs. This computer is also connected to the central computer system of the laboratory. (auth.)

  16. Algebraic-numeric calculations of proton trajectories in bending magnets of synchrotron accelerator

    International Nuclear Information System (INIS)

    We study a solution of nonlinear differential equation of the second degree which describes the trajectories of the charged particles in the fully inhomogeneous field of cyclic accelerator. We give the clear mathematical statement of the problem and algorithm of solving it. We realize this algorithm on the Computer Algebra System REDUCE 3.2. Our algorithm is based both on the existence of exact solution in terms of hyperelliptic integral and on the existence of power series solution of specific inversion problem. We use the known REDUCE procedures of operation on generalized power series. Using the FORTRAN code we give the numerical analysis of these series in the close relation to the concrete physical situation. We apply our results to the beam dynamics modelling of the protons in the bending magnets in synchrotron accelerator. 18 refs.; 2 figs

  17. Beam loss monitor system of the rapid cycling synchrotron of Japan Proton Accelerator Research Complex

    International Nuclear Information System (INIS)

    The 3 GeV Rapid Cycling Synchrotron (RCS) of the Japan Proton Accelerator Research Complex (J-PARC) provides more than 300 kW beam to the Material and Life Science Facility (MLF) and the Main Ring (MR). In such high intensity hadron accelerator, the lost protons that are a fraction of the beam less than 0.1% cause many problems. Those particles bring about a serious radioactivation and a malfunction of the accelerator components. Therefore, the beam loss monitor (BLM) is one of the most important equipment to observe the state of the beam during operation, and to keep a steady operation. Moreover, if we set operation parameters of BLM adequately, it can detect the beam loss that is 10-6 fraction of the beam. Thus it enables fine-tuning of the accelerator. In the J-PARC RCS, a proportional counter and a plastic scintillation counter are used for the beam commission and the stable operation as BLM. We report present status of the BLM system in J-PARC RCS. (author)

  18. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, M. B.; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; T. Bondo; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagné, S.; Hahn, F.

    2010-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for t...

  19. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, M. B.; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; T. Bondo; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagné, S.; Hahn, F.

    2010-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to pr...

  20. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, M. B.; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; T. Bondo; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagné, S.; Hahn, F.

    2010-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H_2SO_4 vapour and secondly to provide technical input for the CLOUD design. ...

  1. J/ψ production in proton-nucleus and nucleus-nucleus interactions at the CERN SPS

    International Nuclear Information System (INIS)

    The NA38 and NA50 experiments at the CERN SPS have measured charmonium production in different colliding systems with the aim of observing a phase transition from ordinary hadronic matter towards a state in which quarks and gluons are deconfined (Quark Gluon Plasma, QGP). This experimental research is based on the prediction that the J/ψ yield should be suppressed in deconfined matter. The analysis of the data collected by the NA50 experiment with Pb-Pb collisions at 158 GeV/c per nucleon shows that the J/ψ is anomalously suppressed with respect to the pattern observed in proton-nucleus and light ion reactions. (orig.)

  2. Strategies for filling the longitudinal phase space in the injection into a booster proton synchrotron at very high intensity currents

    International Nuclear Information System (INIS)

    A theory of the longitudinal painting in high intensity circular proton synchrotron accelerators is developed. The study of the uniform filling of a limited region of the booster phase space (x, y) and a uniform line density on a finite intervall of the x-axis is achieved by describing the particle beam behaviour via the Vlasov equation with no space charge forces. Analytical painting laws are found for both the cases of small oscillations and pendulum-like motion

  3. The merging of the Intersecting Storage Rings for a 60 GeV collider with the 400 GeV proton synchrotron

    International Nuclear Information System (INIS)

    Following the recommendation of the Workshop on Future ISR Physics, 1976, a study has been made of using the existing ISR (Intersecting Storage Rings) equipment at CERN to build a single 60 GeV storage ring (Merged ISR) for beam collision with the 400 GeV Super Proton Synchrotron (SPS). At a minimum cost of 103 MSF, a single-intersection physics facility with a 3.550 crossing angle, a luminosity of 1.2 1030 cm-2s-1 and a centre-of-mass energy of 255 GeV could be built. For a further 7 MSF, the luminosity could be easily raised to 3.8 1030 cm-2s-1. Alternatively, the MISR can be built to give a single, zero-angle crossing with a luminosity of 1.1 1032 cm-2s-1. The last solution is not recommended, however, as the free space around the intersection is extremely limited and the facility becomes very specialized in the type of physics experiments which could be performed. In all cases, the project could be completed in three years and two months with a 9 1/2-month shutdown for the SPS and 18 months between the closing down of the ISR and the start-up of MISR. (Auth.)

  4. Conceptual design of a 1. 1-GeV 500-. mu. A fast-cycling proton synchrotron

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Y.; Crosbie, E.; Khoe, T.; Kustom, R.; Martin, R.; Norem, J.; Praeg, W.; Thompson, K.; Wuestefeld, G.

    1983-03-01

    A very high intensity proton synchrotron system which could be used for a pulsed spallation neutron source and low energy neutrino and meson physics facility is designed. The synchrotron would accelerate 200 MeV protons to 1.1 GeV with a repetition rate of 50 pulses per sec. The number of protons per pulse is 6.3 x 10/sup 13/, resulting in an average proton current of 500 ..mu..A. In order to accommodate the high intensity considerable attention was directed toward minimizing beam loss, controlling space charge forces, and eliminating beam instabilities. Special features of the conceptual design include H/sup -/ charge exchange injection, a guide field flat-bottom of 1.5 msec to facilitate low-loss injection and capture, 15 msec acceleration period, and 3.5 msec for reset of the guide field. A separated function lattice consists of normal cells, dispersion suppressor cells, and matching cells. It provides sufficient straight section length to accommodate a fairly long rf system. A low impedance rf system (cathode-follower) is considered in order to overcome strong beam loading effects in the cavities. Rapid bunch shaping is employed at the end of acceleration to produce pulses of 200 nsec duration for possible neutrino experiments. The transverse acceptances used in the design are: epsilon/sub H/ = 500...pi.. mm mr and epsilon/sub V/ = 300 ..pi.. mm mr.

  5. The calibration of the central electromagnetic calorimeter of UA1 proton-antiproton experiment at CERN

    International Nuclear Information System (INIS)

    The most important result of the UA1 experiment at CERN has been the discovery of the weak intermediate vector bosons W+, W- and Z0. We describe the calibration of the electromagnetic calorimeter, which gives the signature of the electronic mode of desintegration of the intermediate bosons and measures their masses. We shall discuss this process and give some experimental results

  6. People and things. CERN Courier, Nov 1991, v. 31(9)

    International Nuclear Information System (INIS)

    The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; Following the initial acceleration of protons to 48 0 GeV on 8 October in the superconducting proton ring of the 6.3-kilometre HERA electron-proton collider at the DESY Laboratory, Hamburg, on 19 October the first electron-proton collisions occurred.; In September, an electron beam reached 3 GeV in the booster synchrotron of the European Synchrotron Radiation Facility (ESRF), Grenoble. ; The CERN Accelerator School (CAS) programme for 1992 includes courses on Magnetic Measurement and Alignment, to be held in Montreux, Switzerland, from 16- 20 March.; A Workshop on Pulsed Advanced Neutron Sources for Physics looked at the targetmoderator system required for the SIN-45 intense pulsed neutron source based on the proton beam of the kaon factory planned for the Academy's Institute for Nuclear Research

  7. What do we learn from proton-antiproton diffractive scattering at the CERN colliders

    International Nuclear Information System (INIS)

    We point out that the recent proton-antiproton collision experiments at the ISR allow for the first time a comparison with proton-proton collisions and make it possible to test very general predictions based on axiomatic field theory and also to confirm certain aspects of conventional models and to eliminate certain unorthodox possibilities . We also discuss what will be the output of the measurement of total cross-sections and elastic scattering at the SPS panti p collider, and describe what might happen in the ultra-high energy limit. (orig.)

  8. The Proton Beams for the New Time-of-Flight Neutron Facility at the CERN-PS

    CERN Document Server

    Cappi, R; Métral, G

    2000-01-01

    The experimental determination of neutron cross sections in fission and capture reactions as a function of the neutron energy is of primary importance in nuclear physics. Recent developments at CERN and elsewhere have shown that many fields of research and development, such as the design of Accelerator-Driven Systems (ADS) for nuclear waste incineration, nuclear astrophysics, fundamental nuclear physics, dosimetry for radiological protection and therapy, would benefit from a better knowledge of neutron cross sections. A neutron facility at the CERN-PS has been proposed with the aim of carrying out a systematic and high resolution study of neutron cross sections through Time-Of-Flight (n-TOF) measurement. The facility requires a high intensity proton beam (about 0.7x1013 particles/bunch) distributed in a short bunch (about 25 ns total length) to produce the neutrons by means of a spallation process in a lead target. To achieve these characteristics, a number of complex beam gymnastics have to be performed. All...

  9. An experiment to test advanced materials impacted by intense proton pulses at CERN HiRadMat facility

    CERN Document Server

    Bertarelli, A; Boccone, V; Carra, F; Cerutti, F; Charitonidis, N; Charrondiere, C; Dallocchio, A; Fernandez Carmona, P; Francon, P; Gentini, L; Guinchard, M; Mariani, N; Masi, A; Marques dos Santos, S D; Moyret, P; Peroni, L; Redaelli, S; Scapin, M

    2013-01-01

    Predicting the consequences of highly energetic particle beams impacting protection devices as collimators or high power target stations is a fundamental issue in the design of state-of-the-art facilities for high-energy particle physics. These complex dynamic phenomena can be successfully simulated resorting to highly non-linear numerical tools (Hydrocodes). In order to produce accurate results, however, these codes require reliable material constitutive models that, at the extreme conditions induced by a destructive beam impact, are scarce and often inaccurate. In order to derive or validate such models a comprehensive, first-of-its-kind experiment has been recently carried out at CERN HiRadMat facility: performed tests entailed the controlled impact of intense and energetic proton pulses on a number of specimens made of six different materials. Experimental data were acquired relying on embedded instrumentation (strain gauges, temperature probes and vacuum sensors) and on remote-acquisition devices (laser ...

  10. Measurement of the Antiproton-Proton Total Cross-Section at the CERN ISR

    CERN Multimedia

    2002-01-01

    This experiment is a measurement of small angle scattering of antiprotons on protons and of protons on protons at 15/15, 22/22, 26/26 and 31/31 GeV, with the aim of obtaining data on the total cross-section for the scattering of protons on protons, and of determining the ratio of the real to the imaginary scattering amplitude at zero momentum transfer for antiprotons on protons. The measurement is divided into two parts: \\item 1) The measurement of @s^t^o^t(@*p) and @s^t^o^t(pp), using hodoscopes placed at small angles, outside the vacuum pipe, at approximately 9 metres from the intersection point. \\item 2) The measurement of the region in !t!, the momentum transfer squared, around the value !t^c!, where Coulomb and nuclear scattering are equal, in order to deduce the quantity @r = Re f(t=0)/Im f(t=0). This latter measurement is done by employi in earlier @s^t(pp) and @r experiments at the ISR. \\end{enumerate} In both set-ups the measurements are made by recording coincidences between collinear counters in th...

  11. CERN Heavy-Ion Facility design report

    International Nuclear Information System (INIS)

    The design of the CERN Heavy-Ion Facility is described. This facility will be based on a new ion linear accelerator (Linac 3), together with improvements to the other accelerators of the CERN complex to allow them to cope with heavy ions, i.e. to the Proton Synchrotron Booster (PSB), the Proton Synchrotron (PS) and the Super Proton Synchrotron (SPS). For this reference design, the pure isotope of lead, 208Pb, is considered. The bulk of the report describes Linac 3, a purpose-built heavy-ion linac mainly designed and constructed in collaboration with several CERN member state laboratories, but also with contributions from non-member states. Modifications and improvements to existing CERN accelerators essentially concern the RF acceleration, beam control and beam monitoring (all machines), beam kickers and septa at the input and output of the PSB, and major vacuum improvements, aiming to reduce the pressure by factors of at least seven and three in the PSB and PS respectively. After injection from the Electron Cyclotron Resonance source at 2.5 keV/u the partially stripped heavy-ion beam is accelerated successively by a Radio Frequency Quadrupole and an Interdigital-H linac to 4.2 MeV/u. After stripping to 208Pb53+, the beam is again accelerated, firstly in the PSB (to 98.5 MeV/u), then in the PS (to 4.25 GeV/u). The final stage of acceleration in the SPS takes the fully stripped 208Pb82+ ions to 177 GeV/u, delivering a beam of 4.108 ions per SPS supercycle (15.2 s) to the experiments. The first physics run with lead ions is scheduled for the end of 1994. Finally, some requirements for carrying out heavy-ion physics at the Large Hadron Collider are mentioned. (orig.)

  12. Inside CERN's Large Hadron Collider from the proton to the Higgs boson

    CERN Document Server

    Campanelli, Mario

    2016-01-01

    The book aims to explain the historical development of particle physics, with special emphasis on CERN and collider physics. It describes in detail the LHC accelerator and its detectors, describing the science involved as well as the sociology of big collaborations, culminating with the discovery of the Higgs boson. Readers are led step-by-step to understanding why we do particle physics, as well as the tools and problems involved in the field. It provides an insider's view on the experiments at the Large Hadron Collider.

  13. Search for the top quark at the UA2 detector at the CERN proton-antiproton collider

    International Nuclear Information System (INIS)

    The results of a search for the top quark, done in the UA2 experiment at CERN is presented in this thesis. The data from proton-antiproton collisions, at 546 and 630 GeV energy in the centre-of-mass system, representing a total integrated luminosity of 894 nb-1 accumulated by the UA2 detector, has been used. A signal coming from the semi-leptonic decay of the top quark (t decays to b + electron + neutrino) has been searched for in the event sample containing an identified electron associated with 0.1 or 2 jets. A detailed study of the experimental background coming from misidentified electrons has been made; furthermore, the standard sources of real electrons have been estimated using a simulation program. Taking into account these background evaluations, and using a top production Monte-Carlo, a statistical analysis of the events containing one electron and 2 jets allows us to discuss a lower limit on the top quark mass. An upper limit on top production through the process proton-antiproton goes to top-antitop is derived, as a function of the top mass, from our data. Extrapolating the background and production evaluations to UA2'indicates that this experiment should be sensitive to top masses below 70 GeV/c2

  14. Pion production via proton synchrotron radiation in strong magnetic fields in relativistic field theory: Scaling relations and angular distributions

    Science.gov (United States)

    Maruyama, Tomoyuki; Cheoun, Myung-Ki; Kajino, Toshitaka; Mathews, Grant J.

    2016-06-01

    We study pion production by proton synchrotron radiation in the presence of a strong magnetic field when the Landau numbers of the initial and final protons are ni,f ∼104-105. We find in our relativistic field theory calculations that the pion decay width depends only on the field strength parameter which previously was only conjectured based upon semi-classical arguments. Moreover, we also find new results that the decay width satisfies a robust scaling relation, and that the polar angular distribution of emitted pion momenta is very narrow and can be easily obtained. This scaling implies that one can infer the decay width in more realistic magnetic fields of 1015 G, where ni,f ∼1012-1013, from the results for ni,f ∼104-105. The resultant pion intensity and angular distributions for realistic magnetic field strengths are presented and their physical implications discussed.

  15. Small angle elastic scattering at the CERN proton-antiproton collider

    International Nuclear Information System (INIS)

    Proton-antiproton elastic scattering at a centre of mass energy √s=540 GeV has been studied at low momentum transfer. The measured value of the logarithmic slope of the differential elastic cross-section, b = 17.1 +- 0.9 GeV-2 for 0.04 2, b = 12.9 +- 0.3 GeV-2 for 0.19 2 confirms the previous evidence from the UA1 and UA4 collaborations for an increase at small t. A preliminary estimate of the proton-antiproton total cross-section shows an increase of about 50% from ISR to Collider energy. (orig.)

  16. Upgrade of the CERN PSB/CPS Fast Intensity Measurements

    CERN Document Server

    Monera Martinez, A; Belohrad, D; Jensen, L; Soby, L; Kasprowicz, G

    2011-01-01

    The CERN Proton Synchrotron Booster (PSB) and Proton Synchrotron (CPS) complex fast intensity measurement is undergoing a major upgrade. The old analogue electronics no longer provides enough accuracy, resolution and versatility to perform accurate beam intensity measurements. It has also become less reliable due to the ageing equipment. A new measurement system - Transformer Integrator Card (TRIC) - replaces these obsolete acquisition systems. TRIC is a generic platform used to measure the intensity in different transfer lines at CERN. Five TRICs were installed during the year 2010 in order to evaluate their performance with different beam types, from the low intensity pilot (5×10 9 charges per bunch) to high intensity beams (1×10 13 charges per bunch). The aim of this article is to present the technical aspects of the new system and the different measurement scenarios. It discusses possible sources of measurement errors and presents some statistical data acquired during this period.

  17. The steel septum magnets for beam splitting at the CERN SPS

    CERN Document Server

    Evans, Lyndon R; de Raad, Bastiaan; Thomi, W; Weisse, E

    1978-01-01

    Each of the two slow-extracted proton beams of the CERN 400 GeV Super Proton Synchrotron can be divided into three parts by means of steel- septum magnets for the simultaneous irradiation of up to three production targets. The magnets have radiation-proof coils, integrated vacuum chambers and 'plug-in' connections. The paper describes the design of the magnets and gives the results of the magnetic field measurements. (3 refs).

  18. Kaon and proton ratios from central Pb+Pb collisions at the CERN SPS

    Science.gov (United States)

    Bearden, I. G.; Bøggild, H.; Boissevain, J.; Dodd, J. R.; Erazmus, B.; Esumi, S.; Fabjan, C. W.; Ferenc, D.; Fields, D. E.; Franz, A.; Gaardhøje, J. J.; Hamelin, M.; Hansen, A. G.; Hansen, O.; Hardtke, D.; van Hecke, H.; Holzer, E. B.; Humanic, T.; Hummel, P.; Jacak, B. V.; Jayanti, R.; Kaimi, K.; Kaneta, M.; Kopytine, M.; Leltchouk, M.; Ljubicic, A., Jr.; Lørstad, B.; Maeda, N.; Malina, R.; Murray, M.; Ohnishi, H.; Paic, G.; Pandey, S. U.; Piuz, F.; Pluta, J.; Polychronakos, V.; Potekhin, M.; Poulard, G.; Reichhold, D.; Sakaguchi, A.; Schmidt-Sørensen, J.; Simon-Gillo, J.; Sondheim, W.; Spegel, M.; Sugitate, T.; Sullivan, J. P.; Sumi, Y.; Willis, W. J.; Wolf, K. L.; Xu, N.; Zachary, D. S.

    1998-08-01

    K-/K+ and p¯/p ratios measured in 158A.GeV Pb+Pb collisions are shown as a function of transverse momentum PT and centrality in top 8.5% central region. Little centrality dependence of the K-/K+ and p¯/p ratios is observed. The transverse mass mT distribution and dN/dy of K+, K-, p and p¯ around mid-rapidity are obtained. The temperature Tch and the chemical potentials for both light and strange quarks (μq, μs) at chemical freeze-out are determined by applying simple thermodynamical model to the present data. The resultant μq, μs and Tch are compared with those obtained from similar analysis of SPS S+A and AGS Si+A data. The chemical freeze-out temperature Tch at CERN energies is higher than thermal freeze-out temperature Tfo which is extracted from mT distribution of charged hadrons. At AGS energies Tch is close to Tfo.

  19. A study of three jet events production in proton-antiproton collisions at the CERN collider

    International Nuclear Information System (INIS)

    This thesis presents the study done in the UA2 experiment of events with three large momentum jets of particles. We show that these events are well described by a theoretical model based on leading order Quantum Chromodynamics (QCD) calculations. In this theory, the ratio of the number of 2-jet events to the number of 3-jet events is proportional to the strong coupling constant α(S). We have adjusted this parameter in the model in order to reproduce the observed ratio. In fact, higher order QCD corrections permit only a determination of the strong coupling constant α(S) multiplied by a ratio of ''K-factors'' (K3 over K2) involved in 3-jet and 2-jet production. A study of the systematic errors give the final result: 0.22 ± 0.01 (Stat.) ± 0.04 (Syst.). We compare this value to the results of other recent CERN experiments in nucleon collisions, and discuss it together with other experimental determinations of α(S)

  20. Shaping of proton distribution for raising the space-charge of the CERN PS Booster

    CERN Document Server

    Delahaye, J P; Magnani, L; Nassibian, G; Pedersen, F; Reich, K H; Schindl, Karlheinz; Schönauer, H O

    1980-01-01

    The intensity of the PS Booster is limited by space-charge defocusing forces which create a spread in the betatron tunes of up to Delta G approximately=0.5. Shaping of the transverse and longitudinal distributions was used for accommodating more particles in a given working area and enabled the Booster to accelerate 2*10/sup 13/ protons per pulse, twice the design intensity. Modifying the RF potential well by an experimental second harmonic cavity yields beam intensities and densities well beyond the present performance. The corresponding PSB experiments and improvements are described and an outlook on future developments is given. (14 refs).

  1. Shaping of proton distribution for raising the space-charge of the CERN PS booster

    International Nuclear Information System (INIS)

    The intensity of the PS booster is limited by space-charge defocusing forces which create a spread in the betatron tunes of up to ΔQ approximately equal to 0.5. Shaping of the transverse and longitudinal distributions was used for accommodating more particles in a given working area and enabled the Booster to accelerate 2 x 1013 protons per pulse, twice the design intensity. Modifying the RF potential well by an experimental second-harmonic cavity yields beam intensities well beyond the present performance. The corresponding PSB experiments and improvements are described and an outlook on future developments is given. (Auth.)

  2. A study of the J/psi production in proton-proton collisions at the CERN ISR, using liquid argon calorimeters and lithium/xenon transition radiation detectors

    International Nuclear Information System (INIS)

    The production of electron-positron (e+e-) pairs with invariant masses greater than 2.5 GeV/c2 was investigated at the CERN Intersecting Storage Rings. The J/psi particle was observed by its decay into e+e- pairs and its production cross-section is found to rise by a factor of about six over the entire range of centre-of-mass energies available (√s=23.5 GeV to √s=62.4 GeV). The rapidity and transverse momentum dependence of the production mechanism are discussed. The e+e- pair invariant mass spectrum is also studied for higher masses. The production and decay into e+e- pairs of the psi' is not observed within the statistical limits of the data discussed herein. A few e+e- events with masses above 4.5 GeV/c2 are observed and are used to set upper limits on the cross-section for continuum production resulting from the annihilation of elementary point-like constituents of the protons. (Auth.)

  3. An experiment to test advanced materials impacted by intense proton pulses at CERN HiRadMat facility

    Energy Technology Data Exchange (ETDEWEB)

    Bertarelli, A., E-mail: alessandro.bertarelli@cern.ch [CERN, Engineering Department, Mechanical and Materials Engineering Group (EN-MME), CH-1211 Geneva 23 (Switzerland); Berthome, E. [CERN, Engineering Department, Mechanical and Materials Engineering Group (EN-MME), CH-1211 Geneva 23 (Switzerland); Boccone, V. [CERN, Engineering Department, Sources, Targets and Interactions Group (EN-STI), CH-1211 Geneva 23 (Switzerland); Carra, F. [CERN, Engineering Department, Mechanical and Materials Engineering Group (EN-MME), CH-1211 Geneva 23 (Switzerland); Cerutti, F. [CERN, Engineering Department, Sources, Targets and Interactions Group (EN-STI), CH-1211 Geneva 23 (Switzerland); Charitonidis, N. [CERN, Engineering Department, Machines and Experimental Facilities Group (EN-MEF), CH-1211 Geneva 23 (Switzerland); École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland); Charrondiere, C. [CERN, Engineering Department, Industrial Controls and Engineering Group (EN-ICE), CH-1211 Geneva 23 (Switzerland); Dallocchio, A.; Fernandez Carmona, P.; Francon, P.; Gentini, L.; Guinchard, M.; Mariani, N. [CERN, Engineering Department, Mechanical and Materials Engineering Group (EN-MME), CH-1211 Geneva 23 (Switzerland); Masi, A. [CERN, Engineering Department, Sources, Targets and Interactions Group (EN-STI), CH-1211 Geneva 23 (Switzerland); Marques dos Santos, S.D.; Moyret, P. [CERN, Engineering Department, Mechanical and Materials Engineering Group (EN-MME), CH-1211 Geneva 23 (Switzerland); Peroni, L. [Politecnico di Torino, Department of Mechanical and Aerospace Engineering (DIMEAS), Corso Duca degli Abruzzi 24, 10129 Torino (Italy); Redaelli, S. [CERN, Beams Department, Accelerators and Beams Physics Group (BE-ABP), CH-1211 Geneva 23 (Switzerland); Scapin, M. [Politecnico di Torino, Department of Mechanical and Aerospace Engineering (DIMEAS), Corso Duca degli Abruzzi 24, 10129 Torino (Italy)

    2013-08-01

    Predicting the consequences of highly energetic particle beams impacting protection devices as collimators or high power target stations is a fundamental issue in the design of state-of-the-art facilities for high-energy particle physics. These complex dynamic phenomena can be successfully simulated resorting to highly non-linear numerical tools (Hydrocodes). In order to produce accurate results, however, these codes require reliable material constitutive models that, at the extreme conditions induced by a destructive beam impact, are scarce and often inaccurate. In order to derive or validate such models a comprehensive, first-of-its-kind experiment has been recently carried out at CERN HiRadMat facility: performed tests entailed the controlled impact of intense and energetic proton pulses on a number of specimens made of six different materials. Experimental data were acquired relying on embedded instrumentation (strain gauges, temperature probes and vacuum sensors) and on remote-acquisition devices (laser Doppler vibrometer and high-speed camera). The method presented in this paper, combining experimental measurements with numerical simulations, may find applications to assess materials under very high strain rates and temperatures in domains well beyond particle physics (severe accidents in fusion and fission nuclear facilities, space debris impacts, fast and intense loadings on materials and structures etc.)

  4. Study of the magnetic characteristics of ferrites with a view to their application in a proton synchrotron; Etudes des caracteristiques magnetiques des ferrites en vue de leur application dans un synchrotron a protons

    Energy Technology Data Exchange (ETDEWEB)

    Nguyen, K.C. [Commissariat a l' Energie Atomique, Saclay (France). Centre d' Etudes Nucleaires

    1966-10-01

    In this report magnetic properties of some Ni Zn ferrites available in France are investigated for the purpose of their use in accelerating cavities of proton synchrotron. An attempt is made to measure permeability and quality factor of ferrite versus various physical parameters such as frequency F, the induction B, the magnetic bias field Hp and the temperature, the investigation ranges being: F {<=} 40 Mc/s; B {<=} 10{sup -2} Tesla; Hp {<=} 5000 AT/m; T {<=} 100 C. The measurements were carried out with the one hand, conventional impedance bridge (Q-meter, RX-meter) and on the other hand, with resonating method using an inductive ferrite loaded cavity in parallel with an external capacity. The latter method is of particular interest for the measurements in function of induction and magnetic bias field. (author) [French] Ce travail consiste a etudier les proprietes magnetiques d'un certain nombre de ferrites de Ni Zn disponibles sur le marche francais en vue de leur utilisation dans les cavites acceleratrices d'un synchrotron a protons. On se propose de mesurer la permeabilite et le facteur de qualite du ferrite en fonction de divers parametres physiques tels que la frequence F, l'induction B, le champ magnetique de polarisation Hp et la temperature T, avec: F {<=} 40 Mc/s; B {<=} 10{sup -2} Tesla; Hp {<=} 5000 AT/m; T {<=} 100 C. On effectue les mesures d'une part a l'aide des ponts d'impedance classiques (Q-metre, RX-metre) et d'autre part par la methode du resonateur qui consiste a mettre en parallele une cavite inductive chargee de ferrite et une capacite exterieure. Cette derniere methode est particulierement interessante pour les mesures en fonction de l'induction et du champ magnetique polarisant. (auteur)

  5. Examination of Beryllium Under Intense High Energy Proton Beam at CERN's HiRadMat Facility

    CERN Document Server

    Ammigan, K; Hurh, P; Zwaska, R; Atherton, A; Caretta, O; Davenne, t; Densham, C; Fitton, M; Loveridge, P; O'Dell, J; Roberts, S; Kuksenko, v; Butcher, M; Calviani, M; Guinchard, M; Losito, R

    2015-01-01

    Beryllium is extensively used in various accelerator beam lines and target facilities as material for beam win- dows, and to a lesser extent, as secondary particle produc- tion targets. With increasing beam intensities of future ac- celerator facilities, it is critical to understand the response of beryllium under extreme conditions to avoid compro- mising particle production efficiency by limiting beam pa- rameters. As a result, the planned experiment at CERN’s HiRadMat facility will take advantage of the test facility’s tunable high intensity proton beam to probe and investigate the damage mechanisms of several grades of beryllium. The test matrix will consist of multiple arrays of thin discs of varying thicknesses as well as cylinders, each exposed to increasing beam intensities. Online instrumentations will acquire real time temperature, strain, and vibration data of the cylinders, while Post-Irradiation-Examination (PIE) of the discs will exploit advanced microstructural characteri- zation and imagin...

  6. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, Martin Andreas Bødker; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; Bondo, Torsten; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagne, S.; Hahn, F.

    2010-01-01

    During a 4-week run in October-November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A ...

  7. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, M. B.; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; T. Bondo; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagné, S.; Hahn, F.

    2009-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the CLOUD1 experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide techn...

  8. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, Martin Andreas Bødker; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; Bondo, Torsten; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagné, S.; Hahn, F.

    2009-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the CLOUD1 experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were...

  9. Results from the CERN pilot CLOUD experiment

    OpenAIRE

    J. Duplissy; Enghoff, M. B.; Aplin, K. L.; F. Arnold; Aufmhoff, H.; Avngaard, M.; Baltensperger, U; T. Bondo; R. Bingham; Carslaw, K; J. Curtius; David, A.(CERN, European Organization for Nuclear Research, Geneva, Switzerland); Fastrup, B.; Gagné, S.; Hahn, F.

    2010-01-01

    During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A ...

  10. CERN's Fixed Target Primary Ion Programme

    CERN Document Server

    Manglunki, Django; Axensalva, Jerome; Bellodi, Giulia; Blas, Alfred; Bodendorfer, Michael; Bohl, Thomas; Cettour-Cave, Stephane; Cornelis, Karel; Damerau, Heiko; Efthymiopoulos, Ilias; Fabich, Adrian; Ferreira Somoza, Jose; Findlay, Alan; Freyermuth, Pierre; Gilardoni, Simone; Hancock, Steven; Holzer, Eva Barbara; Jensen, Steen; Kain, Verena; Küchler, Detlef; Lombardi, Alessandra; Michet, Alice; O'Neil, Michael; Pasinelli, Sergio; Scrivens, Richard; Steerenberg, Rende; Tranquille, Gerard

    2016-01-01

    The renewed availability of heavy ions at CERN for the needs of the LHC programme has triggered the interest of the fixed-target community. The project, which involves sending several species of primary ions at various energies to the North Area of the Super Proton Synchrotron, has now entered its operational phase. The first argon run, with momenta ranging from 13 AGeV/c to 150 AGeV/c, took place from February 2015 to April 2015. This paper presents the status of the project, the performance achieved thus far and an outlook on future plans.

  11. Study of the magnetic characteristics of ferrites with a view to their application in a proton synchrotron

    International Nuclear Information System (INIS)

    In this report magnetic properties of some Ni Zn ferrites available in France are investigated for the purpose of their use in accelerating cavities of proton synchrotron. An attempt is made to measure permeability and quality factor of ferrite versus various physical parameters such as frequency F, the induction B, the magnetic bias field Hp and the temperature, the investigation ranges being: F ≤ 40 Mc/s; B ≤ 10-2 Tesla; Hp ≤ 5000 AT/m; T ≤ 100 C. The measurements were carried out with the one hand, conventional impedance bridge (Q-meter, RX-meter) and on the other hand, with resonating method using an inductive ferrite loaded cavity in parallel with an external capacity. The latter method is of particular interest for the measurements in function of induction and magnetic bias field. (author)

  12. Simulating Proton Synchrotron Radiation in the Arcs of the LHC, HL-LHC, and FCC-hh

    CERN Document Server

    Canton, Gerardo Guillermo; Zimmermann, Frank

    2016-01-01

    At high proton-beam energies, beam-induced synchrotron radiation is an important source of heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can give rise to an electron cloud. We use the Synrad3D code developed at Cornell to simulate the photon distributions in the arcs of the LHC, HL-LHC, and FCC-hh. Specifically, for the LHC we study the effect of the “sawtooth” chamber, for the HL-LHC the consequences of the ATS optics with large beta beating in the arcs, and for the FCC-hh the effect of a novel beam-screen design, with a long slit surrounded by a “folded” antechamber.

  13. Design of the injection kicker magnet system for CERN's 14 TeV proton collider LHC

    International Nuclear Information System (INIS)

    Two counter-rotating proton beams will be injected into LHC at an energy of 450 GeV by two kicker magnet systems, producting magnetic field pulses of approximately 750 ns rise time and 6.6 μs flat top duration. To avoid dilution of the beam emittance during injection, a stringent design requirement of the system is a flat top ripple of the magnetic field of less than ±0.5%. Both injection systems are composed of 4 travelling wave kicker magnets of 2.17 m length each, powered by pulse forming networks (PFN's) and matched to their characteristic impedance. To achieve the high required kick strength of 1.2 Tm, for a compact and cost efficient design, a comparably low characteristic impedance of 5 Ω has been chosen. The electrical circuit of the system is being designed with the help of PSpice computer modelling. Most known parasite elements are included in the model to obtain a realistic pulse response prediction. The present paper reports on design and modeling results of the LHC injection kicker magnet system that has several novel and demanding design requirements. (author)

  14. Design of the injection kicker magnet system for CERN's 14 TeV proton collider LHC

    International Nuclear Information System (INIS)

    Two counter-rotating proton beams will be injected into the LHC at an energy of 450 GeV by two kicker magnet systems, producing magnetic field pulses of approximately 750 ns rise time and 6.6 micros flat top duration. To avoid dilution of the beam emittance during injection, a stringent design requirement of the system is a flat top ripple of the magnetic field of less than ±0.5%. Both injection systems are composed of 4 travelling wave kicker magnets of 2.17 m length each, powered by pulse forming networks (PFN's) and matched to their characteristic impedance. To achieve the high required kick strength of 1.2 Tm, for a compact and cost efficient design, a comparably low characteristic impedance of 5 Ω has been chosen. The electrical circuit of the system is being designed with the help of PSpice computer modeling. Most known parasitic elements are included in the model to obtain a realistic pulse response prediction. The present paper reports on design and modeling results of the LHC injection kicker magnet system that has several novel and demanding design requirements

  15. News from the Library: About a dozen prestigious CERN physicists contribute to a special issue of EPJ H

    CERN Multimedia

    CERN Library

    2012-01-01

    European Physical Journal H is a journal published by Springer that focuses on the historical development of ideas in contemporary physics. Since 2009 it has partially replaced the journal "Annales de Physique" published by EDP sciences.   The journal recently published a special issue about CERN accelerators entitled "CERN's accelerators, experiments and international integration 1959-2009", with the former CERN Director-General, Herwig Schopper, as guest editor. The origin of this issue is a symposium that took place at CERN on 3-4 December 2009: "50 years of Nobel Memories in High-Energy Physics", for the 50th anniversary of the CERN Proton Synchrotron. Some of the contributions to this symposium became articles that are a real treasure for physicists and historians. Many of these are actually personal recollections from the main actors of the CERN accelerators. In addition, regular papers have been invited to make this ...

  16. Impact of high energy high intensity proton beams on targets: Case studies for Super Proton Synchrotron and Large Hadron Collider

    CERN Document Server

    Tahir, N A; Shutov, A; Schmidt, R; Piriz, A R

    2012-01-01

    The Large Hadron Collider (LHC) is designed to collide two proton beams with unprecedented particle energy of 7 TeV. Each beam comprises 2808 bunches and the separation between two neighboring bunches is 25 ns. The energy stored in each beam is 362 MJ, sufficient to melt 500 kg copper. Safety of operation is very important when working with such powerful beams. An accidental release of even a very small fraction of the beam energy can result in severe damage to the equipment. The machine protection system is essential to handle all types of possible accidental hazards; however, it is important to know about possible consequences of failures. One of the critical failure scenarios is when the entire beam is lost at a single point. In this paper we present detailed numerical simulations of the full impact of one LHC beam on a cylindrical solid carbon target. First, the energy deposition by the protons is calculated with the FLUKA code and this energy deposition is used in the BIG2 code to study the corresponding...

  17. Design study of the large hadron electron collider and a rapid cycling synchrotron as alternative to the PS booster upgrade at CERN

    Energy Technology Data Exchange (ETDEWEB)

    Fitterer, Miriam

    2013-02-22

    With the Large Hadron Collider (LHC) the exploration of particle physics at center of mass energies at the TeV scale has begun. To extend the discovery potential of the LHC, a major upgrade is foreseen around 2020 of the LHC itself and the LHC injectors - the chain of accelerators preparing the beam for the LHC. One of the injectors - the second one in the chain - is the Proton Synchrotron (PS) Booster. Its performance is currently limited by the space-charge effect, which is the effect of the electromagnetic field of the particle beam on itself. This effect becomes weaker with higher energy, and therefore an energy upgrade of the PS Booster to 2 GeV maximum beam energy is foreseen. As the PS Booster is with its 40 years already an old machine, the construction of a new accelerator, a Rapid Cycling Synchrotron (RCS), to replace the PS Booster has been proposed. In this thesis different options for the beam guidance in the RCS - referred to as lattice and optics - are studied, followed by a more general comparison of different lattices and optics and their performance under consideration of the space-charge effect. To further complement the LHC physics program, also the possibility of deep inelastic lepton-nucleon scattering at the LHC has been suggested, referred to as Large Hadron Electron Collider (LHeC). In this case the proton beam of the LHC collides with the electron beam, which is accelerated in a separate newly built machine. Two options are considered as electron accelerator: a new energy recovery linac - the Linac-Ring option - and the installation of an electron ring in the existing LHC tunnel - the Ring-Ring option. One of the main challenges of the Ring-Ring option is the integration of the electron ring in the current LHC tunnel. A layout, lattice and optics of the electron accelerator is developed in this thesis, which meets the requirements with regard to integration and reaches the beam parameters demanded by the particle physics experiments.

  18. Design study of the large hadron electron collider and a rapid cycling synchrotron as alternative to the PS booster upgrade at CERN

    International Nuclear Information System (INIS)

    With the Large Hadron Collider (LHC) the exploration of particle physics at center of mass energies at the TeV scale has begun. To extend the discovery potential of the LHC, a major upgrade is foreseen around 2020 of the LHC itself and the LHC injectors - the chain of accelerators preparing the beam for the LHC. One of the injectors - the second one in the chain - is the Proton Synchrotron (PS) Booster. Its performance is currently limited by the space-charge effect, which is the effect of the electromagnetic field of the particle beam on itself. This effect becomes weaker with higher energy, and therefore an energy upgrade of the PS Booster to 2 GeV maximum beam energy is foreseen. As the PS Booster is with its 40 years already an old machine, the construction of a new accelerator, a Rapid Cycling Synchrotron (RCS), to replace the PS Booster has been proposed. In this thesis different options for the beam guidance in the RCS - referred to as lattice and optics - are studied, followed by a more general comparison of different lattices and optics and their performance under consideration of the space-charge effect. To further complement the LHC physics program, also the possibility of deep inelastic lepton-nucleon scattering at the LHC has been suggested, referred to as Large Hadron Electron Collider (LHeC). In this case the proton beam of the LHC collides with the electron beam, which is accelerated in a separate newly built machine. Two options are considered as electron accelerator: a new energy recovery linac - the Linac-Ring option - and the installation of an electron ring in the existing LHC tunnel - the Ring-Ring option. One of the main challenges of the Ring-Ring option is the integration of the electron ring in the current LHC tunnel. A layout, lattice and optics of the electron accelerator is developed in this thesis, which meets the requirements with regard to integration and reaches the beam parameters demanded by the particle physics experiments.

  19. People and things. CERN Courier, Jan-Feb 1988, v. 28(1)

    International Nuclear Information System (INIS)

    The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The CERN history project yielded its first fruits a year ago with the publication of a volume covering the years of the creation of CERN. 17 November brought together many of the leading figures from the second period under study – covering the construction and first operation of the proton synchrotron through to the end of 1965 when the intersecting storage rings were authorized. The 3rd ESO/CERN Symposium on Cosmology, Astronomy and Fundamental Physics will be held at the Palazzo Re Enzo, Bologna (Italy) from 16 to 20 May. New annual event, the next CERN Computing School will be in Oxford, UK, from 14-27 August: The programme covers software engineering, document preparation, communications and networks, hardware, data acquisition, computer-aided electronics design etc

  20. Proton-Λ correlations in central Pb+Pb collisions at √sNN=17.3 GeV

    OpenAIRE

    Anticic, T.; Baatar, B.; Botje, M.A.J.; Christakoglou, P.(Nikhef, National Institute for Subatomic Physics, Amsterdam, The Netherlands); Van Leeuwen, M; Wojtaszek-Szwarc, A.

    2011-01-01

    The momentum correlation between protons and Λ particles emitted from central Pb+Pb collisions at √sNN=17.3 GeV was studied by the NA49 experiment at the CERN Super Proton Synchrotron. A clear enhancement is observed for small relative momenta (qinv

  1. The new dc power supply system for the main ring magnets of the 28 GeV CERN proton synchrotron

    CERN Document Server

    Jahn, K; Steckmann, E

    1972-01-01

    High overload capacity, low residual ripple, exact reproducibility of periodic current pulses and very great reliability in long-term duty are essential requirements for a modern power supply system for feeding beam-guide magnets. These requirements can be met with certainty and at reasonable cost by the use of high-performance single-anode mercury-arc converters with suitable electronic control and protective equipment. (4 refs).

  2. Experiments at CERN in 1985

    International Nuclear Information System (INIS)

    This book is a compilation of the current experimental program at CERN. The experiments listed are being performed at one of the following machines: the Super Proton Synchrotron (SPS), the Proton Synchrotron (PS) and the Synchro-Cyclotron (SC). The four experiments to be done by means of the Large Electron Positron machine (LEP) are also listed. The schematic layouts of beams and experiments at the various machines are given in the beginning of the report. The experiment goals and methods are briefly described and a schematic layout of the apparatus is included. Lists of participants and their institutions are also given. The status of the experiments (preparation, data-taking, completed) corresponds to the situation as of 1st November, 1985. ''Completed'' means only that data-taking is finished, not necessarily the analysis of the results; this status is kept for two years and then the experiment is removed from the catalogue. A complete list of all experiments published in this book since 1975 is given at the end of the catalogue. (orig./HSI)

  3. Experiments at CERN in 1988

    International Nuclear Information System (INIS)

    This book is a compilation of the current experimental programme at CERN. The experiments listed are being performed at one of the following machines: The Super Proton Synchrotron (SPS), the Proton Synchrotron (PS) and the Synchro Cyclotron (SC). The four experiments planned for the Large Electron Positron machine (LEP) are also listed. The schematic layouts of beams and experimental areas at the different machines appear at the beginning of the report. The experiments are briefly described and a schematic layout of each apparatus is included together with lists of participants and institutions. The status of the experiments (preparation/data-taking/completed) corresponds to the situation at the end of 1988. The 'completed' status means that data-taking is finished, not necessarily the analysis of the results; this status is kept for two years and then the experiment is removed from the catalogue. A complete list of all the experiments published in these books since 1974 is given at the end. (orig./HSI)

  4. Design of slow-extraction signal source within proton-synchrotron based on FPGA and DDS

    International Nuclear Information System (INIS)

    Background: Proton has a higher precision in cancer treatment than traditional X or γ radiation because of its Bragg peak feature. Shanghai Institute of Applied Physics is participating in the development of the first proton therapy facility of China. Purpose: Stable and adjustable proton beam extraction is one of the key points of the project. The aim of this work is to design high resolution frequency signal source for slow beam extraction. Methods: A fully digital signal source platform is implemented using FPGA developing board DE2-115 and Direct Digital Synthesizer (DDS) board AD9910/PCBZ. The communication between DE2-115 and AD9910/PCBZ is realized via SPI interface with Verilog HDL programming. Results: High accuracy and flexible frequency signal is obtained through the platform and visualized clearly by oscilloscope and spectrometer, despite a little harmonic. Conclusion: The preliminary results show that scheme design of the project is reasonable and meets the needs of demands although many aspects of the scheme have to be improved further. (authors)

  5. Reduction of the calorimeter data with 208Pb projectiles at 158 GeV/Nucleon in the CERN experiment NA49

    International Nuclear Information System (INIS)

    The first heavy ion run involving a 208Pb beam at ELAB = 158 GeV/Nucleon was performed at the CERN Super Proton Synchrotron (SPS) in November-December 1994. The calibration procedures and the analysis of the calorimeter data are present

  6. CERN: Fixed target targets

    International Nuclear Information System (INIS)

    Full text: While the immediate priority of CERN's research programme is to exploit to the full the world's largest accelerator, the LEP electron-positron collider and its concomitant LEP200 energy upgrade (January, page 1), CERN is also mindful of its long tradition of diversified research. Away from LEP and preparations for the LHC proton-proton collider to be built above LEP in the same 27-kilometre tunnel, CERN is also preparing for a new generation of heavy ion experiments using a new source, providing heavier ions (April 1992, page 8), with first physics expected next year. CERN's smallest accelerator, the LEAR Low Energy Antiproton Ring continues to cover a wide range of research topics, and saw a record number of hours of operation in 1992. The new ISOLDE on-line isotope separator was inaugurated last year (July, page 5) and physics is already underway. The remaining effort concentrates around fixed target experiments at the SPS synchrotron, which formed the main thrust of CERN's research during the late 1970s. With the SPS and LEAR now approaching middle age, their research future was extensively studied last year. Broadly, a vigorous SPS programme looks assured until at least the end of 1995. Decisions for the longer term future of the West Experimental Area of the SPS will have to take into account the heavy demand for test beams from work towards experiments at big colliders, both at CERN and elsewhere. The North Experimental Area is the scene of larger experiments with longer lead times. Several more years of LEAR exploitation are already in the pipeline, but for the longer term, the ambitious Superlear project for a superconducting ring (January 1992, page 7) did not catch on. Neutrino physics has a long tradition at CERN, and this continues with the preparations for two major projects, the Chorus and Nomad experiments (November 1991, page 7), to start next year in the West Area. Delicate neutrino oscillation effects could become

  7. CERN accelerator school: Antiprotons for colliding beam facilities

    International Nuclear Information System (INIS)

    This is a specialized course which addresses a wide spectrum of theoretical and technological problems confronting the designer of an antiproton facility for high-energy-physics research. A broad and profound basis is provided by the lecturers' substantial experience gained over many years with CERN's unique equipment. Topics include beam optics, special lattices for antiproton accumulation and storage rings, antiproton production, stochastic cooling, acceleration and storage, r.f. noise, r.f. beam manipulations, beam-beam interaction, beam stability due to ion accumulation, and diagnostics. The SPS (Super Proton Synchrotron) panti p collider, LEAR (the Low Energy Antiproton Ring at CERN), antiprotons in the ISR (Intersecting Storage Rings), the new antiproton collector (ACOL) and gas jet targets are also discussed. A table is included listing the parameters of all CERN's accelerators and storage rings. See hints under the relevant topics. (orig./HSI)

  8. Preliminary design of a technologically advanced and compact synchrotron for proton therapy

    International Nuclear Information System (INIS)

    This paper describes the activity on optimising the parameters of a compact protosynchrotron in the energy range of 80-200 MeV. Based on the 200-MeV protosynchrotron under development at the Budker Institute for Nuclear Physics at Novosibirsk, the work was stimulated by the Italian 'Progetto Adroterapia' whose aim is to diffuse cancer therapy with protons and ions. The innovative aspect of the project is the use of 4-Tesla warm pulsed dipole magnets that allow an accelerator diameter of the order of 2 meters, thus permitting the machine to be transported pre-assembled

  9. Development and research of methods and systems for infra-red synchrotron diagnostics of high-speed processes in beams of electrons and protons

    International Nuclear Information System (INIS)

    Full text: I would like to present the methods and systems of nondestructive diagnostics and study of charged-particle (electron, electron-ion, and proton) beams based on the use of their magnetic-Bremsstrahlung (synchrotron) radiation in a wide spectral range, from the ultraviolet to the far long-wave infrared region [1, 2]. I draw attention to the great diversity of problems, both in accelerator experiments (for example, the study of the coherence of synchrotron radiation) and in other, sometimes quite unrelated fields, such as metrology, high-temperature superconductivity, biology, medicine etc., which might be solved by means of infrared synchrotron accelerator diagnostics, covering the interval of wavelengths 0.3 - 45 μm, which is much larger than the spectral range that is widely used at present (basically, the range 0.3 - 1.1 μm) in various experiments and investigations [3]. (author)

  10. Technical specification for the vacuum chamber assemblies comprising flexible metal bellows, transition pieces, flanges and vacuum tubes for the magnets MCA/MCB in the experimental areas of the 450 GeV proton synchrotron

    CERN Document Server

    CERN. Geneva

    1988-01-01

    Technical specification for the vacuum chamber assemblies comprising flexible metal bellows, transition pieces, flanges and vacuum tubes for the magnets MCA/MCB in the experimental areas of the 450 GeV proton synchrotron

  11. Specification for the vacuum chamber assemblies comprising flexible metal bellows, transition pieces, flanges, and vacuum tubes for the magnets in the Experimental Areas of the 450 GeV Proton Synchrotron

    CERN Document Server

    CERN. Geneva

    1982-01-01

    Specification for the vacuum chamber assemblies comprising flexible metal bellows, transition pieces, flanges, and vacuum tubes for the magnets in the Experimental Areas of the 450 GeV Proton Synchrotron

  12. CERN: LHC magnets

    International Nuclear Information System (INIS)

    With test magnets for CERN's LHC proton-proton collider regularly attaining field strengths which show that 10 Tesla is not forbidden territory, attention turns to why and where quenches happen. If 'training' can be reduced, superconducting magnets become easier to commission

  13. Equipment for measuring pulsed supply of the 400 GeV CERN accelerator

    CERN Document Server

    Aubry, G; De Vries, J

    1977-01-01

    Describes the energy measuring equipment for metering the pulsed supply to the CERN proton synchrotron which is under design and development by Landis and Gyr in association with Electricity' de France. The design will take into account the shape of the load curve and the tariff structure of the supply company. It will include solid state metering, a mini-computer and telemetering equipment. (2 refs).

  14. The Old New Frontier: Studying the CERN-SPS Energy Range with NA61/SHINE

    OpenAIRE

    Szuba Marek

    2012-01-01

    With the Large Hadron Collider entering its third year of granting us insight into the highest collision energies to date, one should nevertheless keep in mind the unexplored physics potential of lower energies. A prime example here is the NA61/SHINE experiment at the CERN Super Proton Synchrotron. Using its large-acceptance hadronic spectrometer, SHINE aims to accomplish a number of physics goals: measuring spectra of identified hadrons in hadron-nucleus collisions to provide reference for a...

  15. Results from the 2009 beam commissioning of the CERN multi-turn extraction

    CERN Document Server

    Benedetto, E; Bohl, T; Cettour Cave, S; Cornelis, K; Cotte, D; Damerau, H; Delrieux, M; Fleuret, J; Fowler, T; Follin, F; Franchi, A; Freyermuth, P; Genoud, H; Gilardoni, S; Giovannozzi, M; Hancock, S; Hans, O; Le Borgne, Y; Manglunki, D; Matli, E; Métral, E; Métral, G; Newman, M; Pereira, L; Peters, F; Riva, Y; Roncarolo, F; Sermeus, L; Steerenberg, R; Vandorpe, B; Wenninger, J

    2010-01-01

    Following the analysis of the results obtained during the first year of beam commissioning of the CERN multiturn extraction, a number of changes have been introduced in the beam manipulations performed in the CERN Proton Synchrotron. This includes a different control of the linear chromaticity, the setting of the nonlinear magnets used to split the beam, and the longitudinal structure in the PS. The results obtained during the 2009 run are presented and discussed in detail, including the beam performance in both the PS and the SPS.

  16. Development of hybrid pixel detectors for proton-proton collisions in the ATLAS experiment at the Large Hadron Collider at CERN

    International Nuclear Information System (INIS)

    The ATLAS experiment at the future large hadron collider at CERN uses a silicon pixel detector as the innermost tracking device. The detector is built using ∼2000 modules which consist of a silicon sensor and 16 bump bonded VLSI electronic readout chips with ∼3000 channels per chip. The requirements for the sensor and the 1.4 x 108 preamplifier channels are discussed. The architectures of several existing readout chips are described. Detailed laboratory measurements have been performed on all chips and the results are compared to the requirements of ATLAS. The performance of a first ATLAS compatible pixel detector assembly in a test beam at CERN is presented. (orig.)

  17. Communication: Protonation process of formic acid from the ionization and fragmentation of dimers induced by synchrotron radiation in the valence region

    Science.gov (United States)

    Arruda, Manuela S.; Medina, Aline; Sousa, Josenilton N.; Mendes, Luiz A. V.; Marinho, Ricardo R. T.; Prudente, Frederico V.

    2016-04-01

    The ionization and fragmentation of monomers of organic molecules have been extensively studied in the gas phase using mass spectroscopy. In the spectra of these molecules it is possible to identify the presence of protonated cations, which have a mass-to-charge ratio one unit larger than the parent ion. In this work, we investigate this protonation process as a result of dimers photofragmentation. Experimental photoionization and photofragmentation results of doubly deuterated formic acid (DCOOD) in the gas phase by photons in the vacuum ultraviolet region are presented. The experiment was performed by using a time-of-flight mass spectrometer installed at the Brazilian Synchrotron Light Laboratory and spectra for different pressure values in the experimental chamber were obtained. The coupled cluster approach with single and double substitutions was employed to assist the experimental analysis. Results indicate that protonated formic acid ions are originated from dimer dissociation, and the threshold photoionization of (DCOOD)ṡD+ is also determined.

  18. A proposed experiment on the proton driven plasma wakefield acceleration

    CERN Document Server

    Xia, G; Lotov, K; Pukhov, A; Assmann, R; Zimmermann, F

    2010-01-01

    Simulations have shown that a high energy and intense proton beam can drive a large amplitude plasma wave and accelerate an electron beam to the energy frontier in a single plasma channel. To verify this novel idea, a proof-of-principle demonstration experiment is now being planned. The idea is to use the available high energy proton beams either from the Proton Synchrotron (PS) or the Super Proton Synchrotron (SPS) at CERN, to shoot the beam into a plasma cell and to excite the plasma wakefield. A strong density modulation due to the excited plasma wakefield is produced for a long drive beam and this modulated beam in turn produces a high electric field. The proposed experimental setup is introduced in this paper. The interactions between the plasma and the proton beam are simulated and the results are presented. The compression of an SPS bunch is also discussed.

  19. Studies of Space Charge Effects in the Proposed CERN PS2

    Energy Technology Data Exchange (ETDEWEB)

    Qiang, Ji; /LBL, Berkeley; Ryne, Robert; /LBL, Berkeley; De Maria, Riccardo; /Brookhaven; Macridin, Alexandru; /Fermilab; Spentzouris, Panagiotis; /Fermilab; Papaphilippou, Yannis; /CERN; Wienands, Ulrich; /SLAC

    2012-06-22

    A new proton synchrotron, the PS2, is under design study to replace the current proton synchrotron at CERN for the LHC upgrade. Nonlinear space charge effects could cause significant beam emittance growth and particle losses and limit the performance of the PS2. In this paper, we report on studies of the potential space-charge effects at the PS2 using three-dimensional self-consistent macroparticle tracking codes, IMPACT, MaryLie/IMPACT, and Synergia. We will present initial benchmark results among these codes. Effects of space-charge on the emittance growth, especially due to synchrotron coupling, aperture sizes, initial painted distribution, and RF ramping scheme will also be discussed.

  20. A study of the production of hadrons in muon-proton reactions at 280 GeV at the CERN proton synchrotron

    International Nuclear Information System (INIS)

    In the experiment NA9 of the European Muon Collaboration EMC for the first time in a muon experiment at high energies the possibility is offerred to detect all final-state hadrons and to measure their momentum. About a third of the particles can be identified beyond by means of Cherenkov and time-of-flight counters. By the measurement of the incoming and the scattered muon the kinematical variables of each event are determined. By application of a detailed simulation of the NA9 spectrometer on events from the Lund Monte-Carlo program the systematic errors and losses of the experiment were estimated, and the data were corrected on these errors and losses. In the analysis of the multiplicities of charged hadrons it was stated that known properties like KNO scaling behaviour and a logarithmic increase of the mean multiplicities with the hadronic c.m. energy W are also observed in this experiment. Furthermore by study of the correlation of the multiplicities in the forward and backward hemisphere and by means of the charge distribution as function of the rapidity it was shown that the assumption is justified at the energies of this experiment that the fragmentation processes in the forward and backward jet proceed independently. Effects were found which are to be explained in the quark-parton model: The dependence of the mean charge of the forward jet on W2 and Bjorken x can only be understood if the contribution (40%) of events by scattering on sea quarks is regarded in this experiment. An estimation of this contribution to the mean charge of the forward jet by means of the quark distribution functions led to a good agreement with the data. (orig./HSI)

  1. CERN: Making CLIC tick

    International Nuclear Information System (INIS)

    While the Large Hadron Collider (LHC) scheme for counter-rotating proton beams in a new superconducting ring to be built in CERN's existing 27-kilometre LEP tunnel is being pushed as the Laboratory's main construction project for the 1990s, research and development continues in parallel for an eventual complementary attack on new physics frontiers with CERN's Linear Collider - CLIC - firing TeV electron and positron beams at each other

  2. CERN: RICH dividends

    International Nuclear Information System (INIS)

    Back in 1985, when the hunt was on at CERN's proton-antiproton collider for as many W and Z particles as possible, an Athens/CERN/Uppsala/Wuppertal group had an unique chance to install a ring-imaging Cherenkov counter (RICH) in one of the twelve end-cap sectors of the big UA2 experiment and squeeze in a short run

  3. First observation of corelations between high transverse momentum charged particles in events from the CERN proton-antiproton collider

    International Nuclear Information System (INIS)

    In events at centre of mass energy 540 GeV from the CERN panti p collider, we have found clear evidence for correlations in rapidity and azimuthal angle between high transverse momentum charged particles. These correlations increase with transverse momentum and are much stronger than the general two-particle correlations in minimum bias events. By analogy to ISR results, a qualitative interpretation in terms of hard scattering and fragmentation of partons is discussed. (orig.)

  4. The RF Cycle of the PIMMS Medical Synchrotron

    CERN Document Server

    Crescenti, M; Knaus, P

    2000-01-01

    This paper presents the design of the RF cycle of the medical synchrotron of the PIMMS (Proton-Ion Medical Machine Study) hosted at CERN. The cycle comprises adiabatic trapping, acceleration and RF gymnastics, for either protons or fully stripped carbon ions. The injection energy is 20 MeV for protons and 7 MeV/u for carbon. Maximum extraction energies are 250 MeV for protons and 400 MeV/u for carbon ions. The cycle duration is less than 1 s, with a maximum magnetic field ramp below 3 T/s. The simulations show that the beam stays inside the aperture of the machine, and that, theoretically, there are no longitudinal losses. At the end of the cycle, the beam is ready for extraction with a Dp/p = 0.4 %. The peak RF voltage is 3 kV and the frequency ranges from 0.4 to 3 MHz.

  5. Longitudinal instability of a bunched beam resulting from current loading of the accelerating system in an ultrahigh-energy proton synchrotron

    CERN Document Server

    Ivanov, S V

    1981-01-01

    Collective effects in the acceleration and storage of particles have recently attracted considerable interest. The authors discuss the theory of the longitudinal multipole instabilities of coupled modes of a bunched beam. Up to now, there has been no electrodynamic calculation of the excitation of the resonant elements around the beam, so that only impedances of a simple resonator type are used (the variations in the longitudinal component of the electric field on the resonator axis are not taken into account). Furthermore, and particularly significantly, elements of a waveguide nature have been ignored (the accelerating systems of the CERN SPS synchrotron in the working frequency band are examples of such elements). The authors' intention is to correct these deficiencies of the theory. (7 refs).

  6. Studies of proton-proton collisions at the CERN ISR with an identified charged hadron of high transverse momentum at 900. II

    International Nuclear Information System (INIS)

    Results are reported from a study of proton-proton collisions at a c.m. energy of 52.6 GeV, in which a charged hadron with large transverse momentum is emitted near 900 in the c.m.s. Pairs of particles opposite in azimuth to the trigger particle with transverse momenta above a fixed value shows evidence for jet-like structures. Methods to isolate jet-like groups of particles are compared on the basis of a simple model of jet events. Results on the distribution and internal properties of jets from proton-proton collisions are presented, using one of these methods. The jets are found to be very similar in structure to jets observed in e+e- annihilations and in γp scattering, but have about 20% higher multiplicity mainly originating at small x(parallel). The charge of the jets is correlated with the charge of the trigger particle. (Auth.)

  7. ELECTRON CLOUD EFFECTS IN HIGH INTENSITY PROTON ACCELERATORS.

    Energy Technology Data Exchange (ETDEWEB)

    WEI,J.; MACEK,R.J.

    2002-04-14

    One of the primary concerns in the design and operation of high-intensity proton synchrotrons and accumulators is the electron cloud and associated beam loss and instabilities. Electron-cloud effects are observed at high-intensity proton machines like the Los Alamos National Laboratory's PSR and CERN's SPS, and investigated experimentally and theoretically. In the design of next-generation high-intensity proton accelerators like the Spallation Neutron Source ring, emphasis is made in minimizing electron production and in enhancing Landau damping. This paper reviews the present understanding of the electron-cloud effects and presents mitigation measures.

  8. 50 Years of synchrotrons Adams' Memorial lecture

    CERN Document Server

    Lawson, J D; CERN. Geneva

    1996-01-01

    Fifty years ago Frank Goward of the Atomic Energy Research Establishment Group at Malvern converted a small American betatron to make the worldÕs first synchrotron. At the same time Marcus Oliphant was planning to build at Birmingham a large proton machine with a ring magnet and variable magnetic field. Ideas for this had come to him during night-shifts tending the electromagnetic separators at Oak Ridge during the war. Some seven years later, in 1953, a group gathered together in Geneva to build the PS. A major contributor to the design work which had made this possible was John Adams. An account of some of the achievements in these eventful years will be presented. CERN has built nine synchrotrons/colliders and two temporary test rings. Eight machines are still running. The review will start with the PS, the first proton synchrotron based on the alternating gradient principle invented in 1952 at BNL. The design work of the PS team, under the enlightened leadership of J.B. Adams, and the construction of the...

  9. Studies of proton-proton collisions at the CERN ISR with an identified charged hadron of high transverse momentum at 900. II

    International Nuclear Information System (INIS)

    Results are reported from an investigation of proton-proton collisions at a c.m. energy of 52.6 GeV, in which a charged hadron with large transverse momentum is produced near 900 in the c.m.s. The authors have studied the momentum and charge correlations between identified high-psub(T) trigger particles and other charged particles in the central region (rapidity mod(y) - and anti p triggers are observed to have fewer negative high-psub(T) recoil particles within mod(y) < 1 than other trigger particles. (Auth.)

  10. Results from the CERN pilot CLOUD experiment

    DEFF Research Database (Denmark)

    Duplissy, J.; Enghoff, Martin Andreas Bødker; Aplin, K.L.;

    2010-01-01

    During a 4-week run in October-November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment...... was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm...... become significant, improvements are needed in controlling the experimental variables and in the reproducibility of the experiments. Finally, concerning technical aspects, the most important lessons for the CLOUD design include the stringent requirement of internal cleanliness of the aerosol chamber...

  11. Relativistic heavy ion physics at CERN and BNL

    International Nuclear Information System (INIS)

    Collisions between relativistic nuclei are studied to explore nuclear matter in the regions of high energy and baryon density. The present experimental programs were conducted at the Brrokhaven Alternating Gradient Synchrotron and the CERN Super Proton Synchrotron. At these facilities, it is expected that a quark-gluon plasma can be created in a baryon-rich environment. The primary objective of this research was to show how efficiently high energy nuclei slow each other and deposit energy in the midrapidity region. The second objective was to locate indications for or against thermalization of the deposited energy. The third objective was the search for special signals indicating the presence of a quark-gluon plasma. This discussion focused on experimental facilities, global observables, distributions of identified particles, and nuclear stopping power and energy densities. 176 refs., 20 figs., 3 tabs

  12. Evaluation of the broadband longitudinal impedance of the CERN PS

    CERN Document Server

    Damerau, H; Hancock, S; Migliorati, M; Palumbo, L; Persichelli, S; CERN. Geneva. ATS Department

    2012-01-01

    The CERN Proton Synchrotron (PS) produces beams well beyond its original parameters and especially the high-brightness beams delivered to the Large Hadron Collider are close to present stability limitations. Within the framework of the LHC Injectors Upgrade project, a signicant increase in beam intensity is planned. With this background, collective effects triggered by the self-induced electromagnetic elds, which are generated by the interaction of the beam with the surrounding environment, may play an important role in beam stability and machine performance. In this paper we study the short range wakeelds and the corresponding longitudinal broadband coupling impedance of the PS by measuring the incoherent quadrupole synchrotron frequency as a function of beam intensity and comparing the results with the evaluation of the contribution of several machine installations to the total impedance budget.

  13. Studies of proton-proton collisions at the CERN ISR with an identified charged hadron of high transverse momentum at 900. I

    International Nuclear Information System (INIS)

    In the course of an experiment to investigate the structure of final states from high energy proton-proton collisions containing an identified charged hadron of high transverse momentum near 900 in the c.m.s., the authors have studied correlations between the high-Psub(T) trigger particle and forward charged particles. An azimuthal asymmetry is observed for the forward particles. A transverse momentum recoil against the trigger particle is seen, largest at large Feynman x and apparently saturating with increasing trigger momentum. A flatter Psub(T) spectrum for the associated forward particles at 900 in azimuth to the trigger is also observed than in normal events. The dependence of the correlations on the quantum numbers of the trigger particle is generally small in this region of phase space. (Auth.)

  14. Study of heavy flavours from muons measured with the ALICE detector in proton-proton and heavy-ion collisions at the CERN-LHC

    International Nuclear Information System (INIS)

    ALICE (A Large Ion Collider Experiment) is the experiment dedicated to the study of heavy-ion collisions at the LHC. ALICE also takes part in the LHC proton- proton program which is of great interest for testing perturbative QCD calculations at unprecedented low Bjorken-x values and for providing the necessary baseline for nucleus-nucleus and proton-nucleus collisions. ALICE will also collect, in the beginning of 2013, p-Pb/Pb-p collisions in order to investigate cold nuclear matter effects. ALICE measures quarkonia and open heavy flavours with (di)-electrons, (di)-muons and through the hadronic channels. This thesis work is devoted to the study of open heavy flavours in proton-proton and Pb-Pb collisions via single muons with the ALICE forward muon spectrometer. The document is organized as follows. The first chapter consists in a general introduction on heavy-ion collisions and QCD phase transitions. Chapter 2 summarizes the motivations for the study of open heavy flavours in nucleon-nucleon, nucleon-nucleus and nucleus-nucleus collisions. Chapter 3 gives an overview of the ALICE experiment with a detailed description of the forward muon spectrometer. Chapter 4 gives a short summary of the ALICE online and offline systems. Then the analysis framework (for data and simulations) and in particular the software developed for the study of open heavy flavours is detailed. Chapter 5 summarizes the performance of the ALICE muon spectrometer for the study of the production of open heavy flavours in pp collisions via single muons and dimuons. Chapters 6 to 9 are dedicated to data analysis. Chapter 6 deals with the analysis of first pp collisions at 900 GeV. The main aim was the understanding of the response of the apparatus. Chapter 7 presents the measurement of the production of heavy flavour decay muons in pp collisions at √(s) = 7 TeV. The analysis strategy is described: event and track selection, background subtraction (mainly the contribution of muons from primary

  15. CERN: LEP delivers; Looking deeper at spin; Handling low energy antiprotons

    International Nuclear Information System (INIS)

    One year ago, with the world catalogue of Z particles - the electrically neutral carrier of the weak nuclear force - containing a few hundred examples, it sounded extravagant when proponents of CERN's new LEP electron-positron collider promised a hundred thousand Zs by Christmas 1989. The first round of experiments in the North Area of CERN's SPS proton synchrotron included a considerable investment in studies using high energy muon beams. This paid off with important contribuions to physics, particularly in the measurement of the quark/gluon content (structure functions) of nucleons. ; The LEAR low energy antiproton ring at CERN takes its antimatter beams down to very low kinetic energies - less than 10 MeV - for a unique range of physics studies. However even these modest energies are too high for a series of experiments aiming to explore the effects of gravity on antimatter

  16. Design Study of the Large Hadron Electron Collider and a Rapid Cycling Synchrotron as Alternative to the PS Booster Upgrade at CERN

    OpenAIRE

    Fitterer, Miriam

    2013-01-01

    To further extend the discovery potential of the Large Hadron Collider (LHC), a major upgrade is foreseen around 2020 of the LHC itself and the LHC injectors. Furthermore it has been suggested to built a new electron accelerator in order to allow for deep inelastic lepton-nucleon scattering at the LHC, referred to as Large Hadron Electron Collider (LHeC). In this thesis design options for a new LHC injector - a Rapid Cycling Synchrotron - and an electron accelerator for the LHeC are presented.

  17. NA61/SHINE facility at the CERN SPS: beams and detector system

    International Nuclear Information System (INIS)

    NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility — the beams and the detector system — before the CERN Long Shutdown I, which started in March 2013

  18. NA61/SHINE facility at the CERN SPS: beams and detector system

    CERN Document Server

    Abgrall, N; Aduszkiewicz, A; Ali, Y; Anticic, T; Antoniou, N; Baatar, B; Bay, F; Blondel, A; Blumer, J; Bogomilov, M; Bogusz, M; Bravar, A; Brzychczyk, J; Bunyatov, S A; Christakoglou, P; Czopowicz, T; Davis, N; Debieux, S; Dembinski, H; Diakonos, F; Di Luise, S; Dominik, W; Drozhzhova, T; Dumarchez, J; Dynowski, K; Engel, R; Efthymiopoulos, I; Ereditato, A; Fabich, A; Feofilov, G A; Fodor, Z; Fulop, A; Gazdzicki, M; Golubeva, M; Grebieszkow, K; Grzeszczuk, A; Guber, F; Haesler, A; Hasegawa, T; Hierholzer, M; Idczak, R; Igolkin, S; Ivashkin, A; Jokovic, D; Kadija, K; Kapoyannis, A; Kaptur, E; Kielczewska, D; Kirejczyk, M; Kisiel, J; Kiss, T; Kleinfelder, S; Kobayashi, T; Kolesnikov, V I; Kolev, D; Kondratiev, V P; Korzenev, A; Koversarski, P; Kowalski, S; Krasnoperov, A; Kurepin, A; Larsen, D; Laszlo, A; Lyubushkin, V V; Mackowiak-Pawlowska, M; Majka, Z; Maksiak, B; Malakhov, A I; Maletic, D; Manglunki, D; Manic, D; Marchionni, A; Marcinek, A; Marin, V; Marton, K; Mathes, H J; Matulewicz, T; Matveev, V; Melkumov, G L; Messina, M; Mrowczynski, St; Murphy, S; Nakadaira, T; Nirkko, M; Nishikawa, K; Palczewski, T; Palla, G; Panagiotou, A D; Paul, T; Peryt, W; Petukhov, O; Pistillo, C; Planeta, R; Pluta, J; Popov, B A; Posiadala, M; Pulawski, S; Puzovic, J; Rauch, W; Ravonel, M; Redij, A; Renfordt, R; Richter-Was, E; Robert, A; Rohrich, D; Rondio, E; Rossi, B; Roth, M; Rubbia, A; Rustamov, A; Rybczynski, M; Sadovsky, A; Sakashita, K; Savic, M; Schmidt, K; Sekiguchi, T; Seyboth, P; Sgalaberna, D; Shibata, M; Sipos, R; Skrzypczak, E; Slodkowski, M; Sosin, Z; Staszel, P; Stefanek, G; Stepaniak, J; Stroebele, H; Susa, T; Szuba, M; Tada, M; Tereshchenko, V; Tolyhi, T; Tsenov, R; Turko, L; Ulrich, R; Unger, M; Vassiliou, M; Veberic, D; Vechernin, V V; Vesztergombi, G; Vinogradov, L; Wilczek, A; Wlodarczyk, Z; Wojtaszek-Szwarz, A; Wyszynski, O; Zambelli, L; Zipper, W

    2014-01-01

    NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) is a multi-purpose experimental facility to study hadron production in hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. It recorded the first physics data with hadron beams in 2009 and with ion beams (secondary 7Be beams) in 2011. NA61/SHINE has greatly profited from the long development of the CERN proton and ion sources and the accelerator chain as well as the H2 beamline of the CERN North Area. The latter has recently been modified to also serve as a fragment separator as needed to produce the Be beams for NA61/SHINE. Numerous components of the NA61/SHINE set-up were inherited from its predecessors, in particular, the last one, the NA49 experiment. Important new detectors and upgrades of the legacy equipment were introduced by the NA61/SHINE Collaboration. This paper describes the state of the NA61/SHINE facility - the beams and the detector system - before the CERN Long Shutdown I, which started in March ...

  19. Electron identification for transverse momentum above 10 GeV/c in UA2' at the proton-antiproton collider at CERN

    International Nuclear Information System (INIS)

    The CERN decision to increase the luminosity of the proton-antiproton collider (ACOL) at 630 GeV in the center of mass by about one order of magnitude, has motivated the upgrade of the UA2 detector in order to search for the top quark. The main improvement of the detector consists in a better electron identification and an increase of the hadronic calorimeter coverage. The upgraded central detector uses new techniques to identify electrons, in particular a scintillating fiber detector (SFD). This detector of cylindrical geometry have been built at the CEN Saclay (DPhPE) using ∼ 60,000 fibers arranged in 24 layers. It measures tracks (6 points in space) as well as the position of electromagnetic preshowers. It rejects fake electrons, simulated by the spacial overlap of a πo and a hadron, with the help of a precise measurement of the distance between track and preshower. Using data from a small integrated luminosity 46 nb-1 achieved on 1987, we have studied the UA2 electron identification improvement. Comparing the electron transverse momentum spectra observed both in the old and the new detector we have found that the electron identification of the new UA2 apparatus has improved by an order of magnitude. The expected increase of the luminosity for the coming runs and the good knowledge of the UA2 apparatus will make it possible to improve tests of the standard model and in particular to achieve a better sensitivity for the top quark search

  20. Chromium mapping in male mice reproductive glands exposed to CrCl 3 using proton and X-ray synchrotron radiation microbeams

    Science.gov (United States)

    Ortega, R.; Devès, G.; Bonnin-Mosbah, M.; Salomé, M.; Susini, J.; Anderson, L. M.; Kasprzak, K. S.

    2001-07-01

    Preconception exposure to certain chemicals may increase risk of tumors in offspring, especially with regard to occupational metals such as chromium. However, the mechanism of chromium trans-generation carcinogenicity remains unknown. Using scanning proton X-ray microanalysis we have been able to detect chromium in testicular tissue sections from mice treated by intraperitoneal injection of 1 mmol/kg CrCl 3. Chromium concentration was about 5 μg/g dry mass in average, but higher concentrations were found within the limiting membrane of the testes, the tunica albuginea. In addition, synchrotron radiation X-ray fluorescence measurements, with microscopic resolution, clearly demonstrated the presence of chromium in the tunica albuginea but also within isolated cells from the interstitial connective tissue.

  1. Designing high energy accelerators under DOE's ''New Culture'' for environment and safety: An example, the Fermilab 150 GeV Main Injector proton synchrotron

    International Nuclear Information System (INIS)

    Fermilab has initiated a design for a new Main Injector (150 GeV proton synchrotron) to take the place of the current Main Ring accelerator. ''New Culture'' environmental and safety questions are having to be addressed. The paper will detail the necessary steps that have to be taken in order to obtain the permits which control the start of construction. Obviously these depend on site-specific circumstances, however some steps are universally applicable. In the example, floodplains and wetlands are affected and therefore the National Environmental Policy Act (NEPA) compliance is a significant issue. The important feature is to reduce the relevant regulations to a concise set of easily understandable requirements. The effort required and the associated time line will be presented so that other new accelerator proposals can benefit from the experience gained from this example

  2. Two-processor automatized system to control fast measurements of the magnetic field index of the JINR 10 GeV proton synchrotron

    International Nuclear Information System (INIS)

    A two-processor system comprizing a hard-wired module and ES-1010 computer to control measurements of the magnetic field index of the JINR 10 GeV proton synchrotron is described. The system comprises the control module, a computer interface and a parallel branch driver residing in CAMAC system crate. The control module controls analogue multiplexer and analogue-to-digital converter through their front panels and writes down the information into a buffer memory module through the CAMAC highway. The computer controls the system, reads the information into core memory, writes down it on a magnetic tape, processes it and outputs n=f(r) plots on TV monitor and printer. The system provides the measurement up to 100 points during a magnetic field rise and minimal time of measurement 50 μs

  3. Designing high energy accelerators under DOE's 'New Culture' for environment and safety: An example, the Fermilab 150 GeV Main Injector proton synchrotron

    International Nuclear Information System (INIS)

    Fermilab has initiated a design for a new Main Injector (150 GeV proton synchrotron) to take the place of the current Main Ring accelerator. 'New Culture' environmental and safety questions are having to be addressed. The paper details the necessary steps that have to be taken in order to obtain the permits which control the start of construction. Obviously these depend on site-specific circumstances, however some steps are universally applicable. In the example, floodplains and wetlands are affected and therefore the National Environmental Policy Act (NEPA) compliance is a significant issue. The important feature is to reduce the relevant regulations to a concise set of easily understandable requirements. The effort required and the associated time line are presented so that other new accelerator proposals can benefit from the experience gained from this example

  4. The Merit(nTOF-11) High Intensity Liquid Mercury Target Experiment at the CERN PS

    CERN Document Server

    Efthymiopoulos, I; Caretta, O; Carroll, A J; Fabich, A; Graves, V B; Grudiev, A; Haug, F; Kirk, H G; Lettry, Jacques; Loveridge, P; McDonald, K T; Mokhov, N; Palm, M; Park, H; Pernegger, H; Spampinato, P T; Steerenberg, R; Striganov, S; Tsang, T

    2008-01-01

    The MERIT(nTOF-11) experiment is a proof-ofprinciple test of a target system for a high power proton beam to be used as front-end for a neutrino factory or a muon collider. The experiment took data in autumn 2007 with the fast-extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of $30 × 10^{12}$ per pulse. The target system, based on a free mercury jet, is capable of intercepting a 4-MW proton beam inside a 15-T magnetic field required to capture the low energy secondary pions as the source for intense muon beams. Partice detectors installed around the target setup measure the secondary particle flux out of the target and can probe cavitation effects in the mercury jet when excited by an intense proton beam.Preliminary results of the data analysis will be presented here.

  5. Possible evidence of disoriented chiral condensates from the anomaly in and $\\overline{}$ abundances at the super proton synchrotron

    Indian Academy of Sciences (India)

    J I Kapusta; S M H Wong

    2003-05-01

    No conventional picture of nucleus–nucleus collisions has yet been able to explain the abundance of and $\\overline{}$ in central collisions between Pb nuclei at 158 A GeV at the CERN SPS. We argue that such a deviation from predictions of statistical thermal models and numerical simulations is the evidence that they are produced as topological defects in the form of skyrmions arising from the formation of disoriented chiral condensates. The estimated domain size falls in the right range to be consistent with the so far non-observation of disoriented chiral condensate (DCC) from the distribution of neutral pions.

  6. The RF Cycle of the PIMMS Synchrotron

    CERN Document Server

    Crescenti, M; Rossi, S

    1999-01-01

    This paper deals with the study of the rf cycle of the synchrotron of the Proton-Ion Medical Machine Study (PIMMS) hosted at CERN. The cycle comprises the adiabatic trapping, the acceleration and the rf gymnastics, both for protons and fully stripped carbon ions. The injection energy is 20 MeV for protons and 7 MeV/u for carbon. The maximum extraction energies are 250 MeV for protons and 400 MeV/u for carbon ions. The reserved time is less than 1 s, with a maximum magnetic field ramp of less than 3 T/s. The simulations show that the beam stays inside the aperture of the machine, and that there are no longitudinal losses. At the end of the cycle the beam is ready for extraction with a Dp/p of 0.4 %. The peak rf voltage is 3 kV and the frequency range is from 0.49 to 2.85 MHz.

  7. Large hadron collider project in CERN

    International Nuclear Information System (INIS)

    The Large Hadron Collider (LHC) is the latest scientific project in the world of particle physics launched by European Organization for Nuclear Research (CERN) nearby Geneva. The construction of the main components of this complex synchrotron ring where two proton beams will be accelerated up to energies of 7.7 TeV and then brought into collision, is well underway and the first installation of these components is expected to take place by the end of 2000. As a successor of the existing LEP machine and taking over a significant part of its infrastructure, when completed and commissioned in 2005, the LHG complex represent the most sophisticated and the largest project ever undertaken in the world of science. This machine has an ambitious task to offer the most contemporary and highest quality programmes in particle physics for scientists from all over the world. Its design and construction make use of the latest achievements in modern technologies, material sciences, engineering, computers, electronics and employing world wide experts and specialists of various profiles. At the same time, the LHC project ought to enable CERN and European scientists to maintain the world leading role in the field of particle physics in the next century. (author)

  8. Pseudorapidity distributions of charged particles in Pb–Pb collisions at super proton synchrotron energies from the NA50 experiment

    Indian Academy of Sciences (India)

    Marek Idzik; M C Abreu; B Alessandro; C Alexa; R Arnaldi; M Atayan; C Baglin; A Baldit; M Bedjidian; S Beolè; V Boldea; P Bordalo; G Borges; A Bussière; L Capelli; C Castanier; J Castor; B Chaurand; I Chevrot; B Cheynis; E Chiavassa; C Cicalò; T Claudino; M P Comets; N Constans; S Constantinescu; P Cortese; A De Falco; N De Marco; G Dellacasa; A Devaux; S Dita; O Drapier; L Ducroux; B Espagnon; J Fargeix; P Force; M Gallio; Y K Gavrilov; C Gerschel; P Giubellino; M B Golubeva; M Gonin; A A Grigorian; S Grigorian; J Y Grossiord; F F Guber; A Guichard; H Gulkanyan; R Hakobyan; R Haroutunian; M Idzik; D Jouan; T L Karavitcheva; L Kluberg; A B Kurepin; Y Le Bornee; C Lourenço; P Macciotta; M Mac Cormick; A Marzari-Chiesa; M Masera; A Masoni; M Monteno; A Musso; P Petiau; A Piccotti; J R Pizzi; W L Prado da Silva; F Prino; G Puddu; C Quintans; L Ramello; S Ramos; P Rato Mendes; L Riccati; A Romana; H Santos; P Saturnini; E Scalas; E Scomparin; S Serci; R Shahoyan; F Sigaudo; S Silva; M Sitta; P Sonderegger; X Tarrago; N S Topilskaya; G L Usai; E Vercellin; L Villatte; N Willis; NA50 Collaboration

    2003-05-01

    We present the measurements of charged particle pseudorapidity distributions dch/d performed by the NA50 experiment in Pb–Pb collisions at the CERN SPS. Measurements were done at incident energies of 40 GeV ($\\sqrt{s}=8.77$ GeV) and 158 GeV ($\\sqrt{s}=17.3$ GeV) per nucleon over a broad impact parameter range. The multiplicity distributions are studied as a function of centrality using the number of participating nucleons (part), or the number of binary nucleon–nucleon collisions (coll). Their values at midrapidity exhibit a linear scaling with part at both energies. Particle yield increases approximately by a factor of 2 between $\\sqrt{s}=8.77$ GeV and $\\sqrt{s}=17.3$ GeV.

  9. A CERN-based high-intensity high-energy proton source for long baseline neutrino oscillation experiments with next-generation large underground detectors for proton decay searches and neutrino physics and astrophysics

    CERN Document Server

    Rubbia, A

    2010-01-01

    The feasibility of a European next-generation very massive neutrino observatory in seven potential candidate sites located at distances from CERN ranging from 130 km to 2300 km, is being considered within the LAGUNA design study. The study is providing a coordinated technical design and assessment of the underground research infrastructure in the various sites, and its coherent cost estimation. It aims at a prioritization of the sites within summer 2010 and a start of operation around 2020. In addition to a rich non-accelerator based physics programme including the GUT-scale with proton decay searches, the detection of a next-generation neutrino superbeam tuned to measure the flavor-conversion oscillatory pattern (i.e. 1st and 2nd oscillation maxima) would allow to complete our understanding of the leptonic mixing matrix, in particular by determining the neutrino mass hierarchy and by studying CP-violation in the leptonic sector, thereby addressing the outstanding puzzle of the origin of the excess of matter ...

  10. Early British synchrotrons, an informal history

    International Nuclear Information System (INIS)

    An historical account of the design and construction of early synchrotrons in the United Kingdom, based partly on personal reminiscences, is presented. Material is also drawn from archives at Birmingham and CERN. The document covers the period from plans for the world's first synchrotron at Malvern after the Second World War to work done at Harwell Laboratory for CERN in the period 1951-1953. (UK)

  11. CERN Choir

    CERN Multimedia

    Staff Association

    2015-01-01

      Do you like singing? The CERN Choir is looking for basses and tenors Join us! Programme Spring Session 2015: Donizetti: Misere & Missa di Gloria e Credo Bellini: Salve Regina Bruckner: Requiem in D minor Next concert: Sunday 31 May 2015 at 17:00 Musicales de Comesières (GE) Rehearsals at CERN Main Auditorium, building 500 On Wednesdays from 20.00 to 22:00 Membership fee: January to June 150 CHF September to December: 100CHF Contact: Baudouin.bleus@cern.ch Facebook/Choeur-du-CERN

  12. The low energy well enriched kaon beam K2 at the KEK 12 GeV proton synchrotron

    International Nuclear Information System (INIS)

    The design and performance of the low energy kaon beam K2 are described. It has been constructed to provide a well enriched kaon beam with a momentum region of 1-2GeV/c at the KEK 12 GeV proton synchroton. It consits of thirteen magnets and an electrostatic separator. The beam acceptance and the beam length are 6.25 msr.% δp/p and 27.9 m, respectively. Beam intensities of 5 x 105 K+ and 1 x 105 K- were obtained at a beam momentum of 2.1 GeV/c for 1012 12 GeV primary protons incident on a 6 mm diam. and 60 mm long platinum target. The π+/K+ ratio measured was about 2 at a beam momentum of 1.6 GeV/c. (orig.)

  13. N$_2$ and Xe Gas Scintillation Cross-Section, Spectrum, and Lifetime Measurements from 50 MeV to 26 GeV at the CERN PS and Booster

    CERN Document Server

    Bosser, Jacques; MacCaferri, R; Plüm, M A

    2002-01-01

    Beam parameters in CERN's Proton Synchrotron (PS) accelerator must be controlled (and measured) with tighter precision than ever before to meet the stringent requirements of the Large Hadron Collider (LHC) programme. A non-destructive beam profile measurement system would be a valuable diagnostic tool. To this end, we measured N2 and Xe gas scintillation absolute cross-sections and lifetimes for proton beam energies from 1.4 to 25 GeV, which should prove valuable in the design and construction of a gas scintillation profile measurement system. We also measured relative cross-sections for proton beam energies between 0.05 and 1.4 GeV.

  14. Courrier CERN

    CERN Multimedia

    2015-01-01

    Example of the cover page of the French version of the CERN Courier; Courrier CERN from January 1962. The journal was published both in English and French up to volume 45, no. 5, June 2005. Since then there is a single-language edition where articles are published either in French or English with an abstract in the other language.

  15. From the Proton Synchrotron to the Large Hadron Collider: 50 Years of Nobel Memories in High-Energy Physics

    CERN Multimedia

    Directorate Office

    As a new era in particle physics approaches with the start of the LHC, a symposium to commemorate many significant events that have marked high-energy physics in the past 50 years will be held at CERN on 3-4 December 2009. The list of confirmed distinguished speakers reads like the Who’s Who of particle physics of the second half of the 20th Century, including the Nobel Laureates James Cronin, Jerome Friedman, Sheldon Glashow, David Gross, Gerardus ‘t Hooft, Leon Lederman, Burton Richter, Carlo Rubbia, Jack Steinberger, Samuel Ting, Martinus Veltman, Stephen Weinberg and Frank Wilczek. They will share with us memories of several landmark events that, over the past 50 years, have shaped our field of science. These events include the discovery of the J/ψ particle by Richter and Ting in the 1970s; the work of Glashow, Salam and Weinberg on the theory of the unified weak and electromagnetic interactions; the discovery of fundamental asymmetries in the K-meson sector by Cronin and Fitch...

  16. CERN & Society

    CERN Multimedia

    2016-01-01

    Non Member State Summer Students 2015 are interviewed about their decision to study STEM subjects, to apply for CERN NMSSS programme, their experience onsite @CERN and takeaways, their future goals and aspirations, offering also advice to fellow students.The Non Member State Summer Student Programme stands for a unique opportunity for students from all over the world to spend their summer at CERN in Geneva, getting involved in some of the world’s biggest experiments. For 8 weeks, summer students gather on-site at CERN and join in the day-to-day work of research. The Programme targets advanced undergraduate and beginning graduate students of physics, computing and engineering, particularly from developing countries. Participating students receive scientific training, attend lectures and work on laboratory-based projects alongside with CERN experts and fellow students.

  17. Proton Football European Championship 2016

    CERN Multimedia

    2016-01-01

    Check out the European championship of proton football 2016 at CERN. Produced by: CERN Audiovisual Productions Service Director: Jacques Fichet Editor: Jacques Fichet Music : Burnt of Jingle Punks You can follow us on:

  18. Radiation protection activities around the CERN accelerators

    International Nuclear Information System (INIS)

    In 1995 several operational circumstances required careful watching by the Radiation Protection Group. Most of these were linked with new or recently started CERN activities: for instance the increasing importance assumed by ISOLDE operation and the breakdowns encountered which have given rise to contamination of the target region and to activity releases. In the SPS ring, several difficulties were brought about by a toilsome installation of a new interlock system, while lead ion operation marked the end of the year, as usual, with higher radiation levels in the SPS experimental areas, despite the fact that existing shielding had been improved. Also at the end of the year, the increase of LEP beam energy to 68 GeV caused a rise of dose rate levels from synchrotron radiation. This was expected, but studies are still needed to assess the full implications for different aspects of radiation protection. On the other hand, the ageing of magnet coils and other equipment (insulators, cables, flexible pipes), aggravated by the high proton beam intensities, has resulted in an increasing frequency of failures (mainly water leaks) both at the PS and at the SPS. If the apparent trend is confirmed, difficulties could be expected in the future for two reasons: the shortage of specialized staff, some of them approaching the CERN dose limit of 15 mSv annually, who can be assigned to repair work; and the lack of spare parts to replace the damaged items. Luckily, the long cooling times following high intensity proton runs provided by the operation with heavy-ions and by the winter shutdown mitigate this situation

  19. Potential Remedies for the High Synchrotron-Radiation-Induced Heat Load for Future Highest-Energy-Proton Circular Colliders

    CERN Document Server

    AUTHOR|(CDS)2084568; Baglin, Vincent; Schaefers, Franz

    2015-01-01

    We propose a new method for handling the high synchrotron radiation (SR) induced heat load of future circular hadron colliders (like FCC-hh). FCC-hh are dominated by the production of SR, which causes a significant heat load on the accelerator walls. Removal of such a heat load in the cold part of the machine, as done in the Large Hadron Collider, will require more than 100 MW of electrical power and a major cooling system. We studied a totally different approach, identifying an accelerator beam screen whose illuminated surface is able to forward reflect most of the photons impinging onto it. Such a reflecting beam screen will transport a significant part of this heat load outside the cold dipoles. Then, in room temperature sections, it could be more efficiently dissipated. Here we will analyze the proposed solution and address its full compatibility with all other aspects an accelerator beam screen must fulfill to keep under control beam instabilities as caused by electron cloud formation, impedance, dynamic...

  20. Realistic modeling of microwave instability effects on the evolution of the beam energy-phase distribution in proton synchrotrons

    International Nuclear Information System (INIS)

    Either bunched or coasting beam in a synchrotron may exhibit microwave instability of the momentum spread is small. A useful physical picture is that beam particles are captured in buckets generated by the beam image current flowing in the longitudinal coupling impedance. Qualitatively, trapping and auto-deceleration occur when the height of the buckets exceed the FWHM energy spread of the beam. Microwave instability implies in addition that the coupling impedance is largest at several times the rf frequency and that the decay of the wakefield is fast enough that bunches do not affect each other. The parameters used in this paper are influenced by the Fermilab Main Ring and design of the Main Injector. The numerical modeling uses standard features of the code ESME. In most of the reported simulations 2 · 104 macroparticles and 32 values of n separated by 1113 provide the current spectrum. Microwave instability may be an intensity limitation during parts of the acceleration cycle where the beam is debunched or loosely bunched, perhaps at injection or high duty factor extraction. Probably of more general importance is the time near transition when the spread in circulation frequency is sharply reduced, i.e., when η ∼ 0. Concrete examples are given in this report

  1. Potential Remedies for the High Synchrotron-Radiation-Induced Heat Load for Future Highest-Energy-Proton Circular Colliders.

    Science.gov (United States)

    Cimino, R; Baglin, V; Schäfers, F

    2015-12-31

    We propose a new method for handling the high synchrotron radiation (SR) induced heat load of future circular hadron colliders (like FCC-hh). FCC-hh are dominated by the production of SR, which causes a significant heat load on the accelerator walls. Removal of such a heat load in the cold part of the machine, as done in the Large Hadron Collider, will require more than 100 MW of electrical power and a major cooling system. We studied a totally different approach, identifying an accelerator beam screen whose illuminated surface is able to forward reflect most of the photons impinging onto it. Such a reflecting beam screen will transport a significant part of this heat load outside the cold dipoles. Then, in room temperature sections, it could be more efficiently dissipated. Here we will analyze the proposed solution and address its full compatibility with all other aspects an accelerator beam screen must fulfill to keep under control beam instabilities as caused by electron cloud formation, impedance, dynamic vacuum issues, etc. If experimentally fully validated, a highly reflecting beam screen surface will provide a viable and solid solution to be eligible as a baseline design in FCC-hh projects to come, rendering them more cost effective and sustainable. PMID:26764998

  2. Potential Remedies for the High Synchrotron-Radiation-Induced Heat Load for Future Highest-Energy-Proton Circular Colliders

    Science.gov (United States)

    Cimino, R.; Baglin, V.; Schäfers, F.

    2015-12-01

    We propose a new method for handling the high synchrotron radiation (SR) induced heat load of future circular hadron colliders (like FCC-hh). FCC-hh are dominated by the production of SR, which causes a significant heat load on the accelerator walls. Removal of such a heat load in the cold part of the machine, as done in the Large Hadron Collider, will require more than 100 MW of electrical power and a major cooling system. We studied a totally different approach, identifying an accelerator beam screen whose illuminated surface is able to forward reflect most of the photons impinging onto it. Such a reflecting beam screen will transport a significant part of this heat load outside the cold dipoles. Then, in room temperature sections, it could be more efficiently dissipated. Here we will analyze the proposed solution and address its full compatibility with all other aspects an accelerator beam screen must fulfill to keep under control beam instabilities as caused by electron cloud formation, impedance, dynamic vacuum issues, etc. If experimentally fully validated, a highly reflecting beam screen surface will provide a viable and solid solution to be eligible as a baseline design in FCC-hh projects to come, rendering them more cost effective and sustainable.

  3. Upgrade Issues for the CERN Accelerator Complex

    CERN Document Server

    Garoby, R

    2008-01-01

    The Large Hadron Collider (LHC) at CERN is at a very advanced stage of hardware commissioning and the first beam collisions in the experiments are expected during the year 2008. In line with the recommendations issued in 2006 by the European Strategy Group for Particle Physics, work has now started for maximizing the physics reach of the LHC and for preparing for other foreseeable needs. Beyond upgrades in the LHC itself, mainly in the optics of the insertions, the injector complex has to be renewed to deliver beam with upgraded characteristics with a high reliability. In a first phase, a new 160 MeV H-linac ("Linac4") will be built to replace the present 50 MeV proton linac (Linac2) and extensive consolidation will be made. In a second phase, the present 26 GeV PS and its set of injectors (Linac2 + PSB) are planned to be replaced with a ~50 GeV synchrotron ("PS2") using a ~4 GeV superconducting proton linac ("SPL") as injector. The SPS itself will also be the subject of major improvements, to be able to cope...

  4. People and things. CERN Courier, Dec 1984, v. 24(10)

    International Nuclear Information System (INIS)

    The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. With the primary goal of exploiting the new Tevatron facilities for physics, Fermilab Director Leon Lederman has announced a management reshuffle, effective from 1 October. The first 550 MeV proton bunches have been successfully extracted from the new Spallation Neutron Source at the Rutherford Appleton Laboratory, UK, at the first attempt.Lee Teng of Fermilab has been appointed Director of Taiwan's recently founded $30 million Synchrotron Radiation Research Centre, the island's first major large scale research project. A Protocol on cooperation between CERN and the Chinese Academy of Sciences was signed at CERN on 18 October by Zhao Guangzhao, a Vice-President of the Academy, and CERN Director General Herwig Schopper. The next Particle Accelerator Conference will be held in Vancouver, Canada, from 13-16 May 1985, organized by the TRIUMF Laboratory. Following the 1983 Santa Fe Conference, it will be the 11th in this biennial series devoted to all aspects of accelerator science, engineering and technology. From 3-14 September, the CERN Accelerator School organized (jointly with the Laboratoire de l'Accélérateur Linéaire, Orsay and the Laboratoire National Saturne, Saclay) a course on General Accelerator Physics at the Ecole Supérieure d'Electricité, Gif-sur-Yvette

  5. Golden Jubilee photos: CERN gets a second Laboratory

    CERN Multimedia

    2004-01-01

    CERN's first large accelerator, the Proton Synchrotron (PS), had hardly come into operation at the beginning of the 1960s, when physicists started to dream of a machine ten times more powerful, operating at 300 Gigaelectronvolts. The construction of such an accelerator required a new laboratory to be built and several European sites were candidates. John Adams, the project leader, suggested using the PS as an injector for the new machine, to achieve the higher energy level at a lower cost. The new Laboratory was therefore to be built on a site adjacent to CERN. The project was approved in 1971, but the CERN Convention, which only provided for a single laboratory, had to be amended. An agreement was signed with France on 16 June 1972 (see photograph), establishing a new site at Prévessin, in the Pays de Gex. The two laboratories, which each had their own administrative structures and Directors-General, were merged in 1976.

  6. Excitation of Longitudinal Coupled-bunch Oscillations with the Wide-band Cavity in the CERN PS

    CERN Document Server

    Ventura, Letizia; Migliorati, Mauro; Sterbini, Guido

    2016-01-01

    Longitudinal coupled-bunch oscillations in the CERN Proton Synchrotron have been studied in the past years and they have been recognized as one of the major challenges to reach the high brightness beam required by the High Luminosity LHC project. In the frame of the LHC Injectors Upgrade project in 2014 a new wide-band Finemet cavity has been installed in the Proton Synchrotron as a part of the coupled-bunch feedback system. To explore the functionality of the Finemet cavity during 2015 a dedicated measurement campaign has been performed. Coupled-bunch oscillations have been excited with the cavity around each harmonic of the revolution frequency with both a uniform and nominal filling pattern. In the following the measurements procedure and results are presented.

  7. The First Stage Modification Of The Servo-spill Feedback System For The Slow Resonant Beam Extraxtion From The Ihep 70 Gev Proton Synchrotron

    CERN Document Server

    Lapin, V V; Yaichkov, V A; Zyatkov, O V

    2004-01-01

    This paper presents the results of the first stage modification of the servo-spill feedback system for the slow resonant beam extraction from the IHEP 70 GeV proton synchrotron. The system has a time delay caused by resonance evolution. In the past the time delay was estimated equal from 1ms to 1.8ms, and the maximum open loop frequency cut-off was considered equal to a few tens Hz. The servo-spill feedback system was being used with the open loop frequency cut-off no more than 20Hz for many years. The qualitative analysis of the beam motion on the phase plot, the modeling of the system on the base of the Hamilton's equations numerical solution and the analysis of the experimental frequency responses indicated that the time delay value is noticeably less than former estimations. The first stage modification of the servo-spill feedback system has increased the open loop frequency cut-off at the beginning of extraction process up to approximately 300 Hz. The suppression coefficients of the beam intensity ripple...

  8. A new way of utilizing pole face windings and magnetic field corrections for independent tuning of betatron wave numbers and chromaticities in the CERN Proton Synchrotron

    CERN Document Server

    Gouiran, R

    1978-01-01

    Precise control of the quadrupole and sextupole components of the magnetic fields in focusing and defocusing sectors respectively was achieved by the combined use of pole-face and yoke windings with three separate power supplies synchronously programmed by a computer. Experience of this technique led to a new philosophy in the design of pole-face windings, in which they become an integral and active part of the magnet. With the arrangement described, focusing and guiding functions are partially separated and an old combined-function accelerator can be transformed effectively into a more flexible separate-function machine without any decrease in available straight- section space. (5 refs).

  9. Development and test of a rectangular CERN ConFlat-type flange

    CERN Document Server

    Miarnau Marin, Ana; Veness, Raymond

    2015-01-01

    Standard circular ConFlat® (CF) flanges are widely used in industry due to their high sealing reliability after being subjected to a bakeout process. The Beam Gas Ionisation (BGI) instrument for the CERN Proton Synchrotron accelerator will require a CF-like rectangular sealing system. Although rectangular CF-type flanges with plastically deforming metal seals have been used, no published designs with validated tests for bakeout under UHV conditions are available. Existing circular CERN CF flanges were compared and a design for a rectangular CF flange was proposed. Two prototypes were manufactured along with copper gaskets. The flanges and gaskets were cleaned and prepared for extensive vacuum testing after bakeout cycles up to 350 °C. This paper summarises the design, analysis and manufacturing process and describes the testing procedures and results. Additionally, the limitations when designing a flange of any shape were explored.

  10. New State of Matter created at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    2000-01-01

    New State of Matter created at CERN At a special seminar on 10 February, spokespersons from the experiments on CERN 's Heavy Ion programme presented compelling evidence for the existence of a new state of matter in which quarks, instead of being bound up into more complex particles such as protons and neutrons, are liberated to roam freely.

  11. CERN Rocks

    CERN Multimedia

    2004-01-01

    The 15th CERN Hardronic Festival took place on 17 July on the terrace of Rest 3 (Prévessin). Over 1000 people, from CERN and other International Organizations, came to enjoy the warm summer night, and to watch the best of the World's High Energy music. Jazz, rock, pop, country, metal, blues, funk and punk blasted out from 9 bands from the CERN Musiclub and Jazz club, alternating on two stages in a non-stop show.  The night reached its hottest point when The Canettes Blues Band got everybody dancing to sixties R&B tunes (pictured). Meanwhile, the bars and food vans were working at full capacity, under the expert management of the CERN Softball club, who were at the same time running a Softball tournament in the adjacent "Higgs Field". The Hardronic Festival is the main yearly CERN music event, and it is organized with the support of the Staff Association and the CERN Administration.

  12. Denis Guedj at CERN

    CERN Multimedia

    2009-01-01

    Denis Guedj (right), pictured with Etiennette Auffray Hillemanns of the CMS collaboration and Hartmut Hillemanns of the DG-KTT group.French author Denis Guedj, who is also a mathematician and Professor of History of Science at Paris VIII University, visited CERN on 7 and 8 October. During a presentation in the CERN Library he discussed his 15 published books and likened the process of novel writing to working on a scientific experiment: it begins with a limited amount of data, and then questions arise, problems are solved and further research reveals truths. Denis Guedj works hard to ensure that his novels contain ‘true fiction’. His most recent visit to CERN will help him to write a new book set at the LHC in which he will combine his scientific interest in what happens when a proton and proton collide with a human story about what happens to a male and female physicist who meet in the LHC tunnel. "Visiting the CMS cavern was...

  13. 1988 CERN school of physics

    International Nuclear Information System (INIS)

    The CERN School of Physics is intended to give young experimental physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These Proceedings contain reports of lecture series on the following topics: introduction to field theory and to weak interactions, heavy ion collisions, perturbative QCD, the standard model, proton-antiproton collider results and detectors, cosmology. (orig.)

  14. 1986 CERN school of physics

    International Nuclear Information System (INIS)

    The CERN school of physics is intended to give young experimental physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These proceedings contain reports of lecture series on the following topics: introduction to symmetries and gauge theories, quark dynamics, experimental tests of gauge theories, proton antiproton collider results and detectors, physics at LEP, superphysics, and quantum black holes. (orig.)

  15. CERN Linac4. The space charge challenge

    Energy Technology Data Exchange (ETDEWEB)

    Hein, Lutz Matthias

    2013-08-06

    In the first phase of the upgrade program of the CERN accelerator complex the proton injector Linac2 will be replaced by a new, normal-conducting H-ion Linac, Linac4, allowing a significant increase of the proton flux intensity along the downstream accelerator complex. In the design of Linac4 three beam transport sections are implemented to match the beam between the different accelerator elements and to model the longitudinal pulse structure. These three beam transport sections, which are the most critical locations in terms of beam quality preservation, are in the focus of this thesis. During the work of this thesis the Low Energy Beam Transport (LEBT), which is required to match the source beam to the radiofrequency quadrupole (RFQ), has been commissioned and its beam dynamics re-constructed. The measurement campaign used to reconstruct the LEBT beam dynamics was performed with the aim to prepare the RFQ commissioning and to maximise the LEBT performance. Downstream of the Linac4 accelerator the beam is transported along a 180 m long transfer line to the Proton Synchrotron Booster (PS-Booster). The transfer line optics was studied, optimised and sections were completely re-designed. The new transfer line optics is characterised by an improved preservation of the beam emittance, higher stability of the optical solution with respect to alignment errors and field jitters of the transfer line magnets and it is matched to each of the PS-Booster injection schemes. In a concluding ''Start-To-End'' simulation based on the measured beam characteristics at the LEBT exit the beam dynamics of the downstream Linac, including the transfer line, was calculated. To minimise particle losses within acceptable emittance preservation the beam optics of the Medium Energy Beam Transport (MEBT) was adapted to the measured beam parameters. This ''Start-To-End'' simulation was performed to identify critical sections of the Linac4 beam dynamics and

  16. CERN Linac4. The space charge challenge

    International Nuclear Information System (INIS)

    In the first phase of the upgrade program of the CERN accelerator complex the proton injector Linac2 will be replaced by a new, normal-conducting H-ion Linac, Linac4, allowing a significant increase of the proton flux intensity along the downstream accelerator complex. In the design of Linac4 three beam transport sections are implemented to match the beam between the different accelerator elements and to model the longitudinal pulse structure. These three beam transport sections, which are the most critical locations in terms of beam quality preservation, are in the focus of this thesis. During the work of this thesis the Low Energy Beam Transport (LEBT), which is required to match the source beam to the radiofrequency quadrupole (RFQ), has been commissioned and its beam dynamics re-constructed. The measurement campaign used to reconstruct the LEBT beam dynamics was performed with the aim to prepare the RFQ commissioning and to maximise the LEBT performance. Downstream of the Linac4 accelerator the beam is transported along a 180 m long transfer line to the Proton Synchrotron Booster (PS-Booster). The transfer line optics was studied, optimised and sections were completely re-designed. The new transfer line optics is characterised by an improved preservation of the beam emittance, higher stability of the optical solution with respect to alignment errors and field jitters of the transfer line magnets and it is matched to each of the PS-Booster injection schemes. In a concluding ''Start-To-End'' simulation based on the measured beam characteristics at the LEBT exit the beam dynamics of the downstream Linac, including the transfer line, was calculated. To minimise particle losses within acceptable emittance preservation the beam optics of the Medium Energy Beam Transport (MEBT) was adapted to the measured beam parameters. This ''Start-To-End'' simulation was performed to identify critical sections of the Linac4 beam dynamics and to adjust the commissioning strategies.

  17. Workshop on Electron-Cloud Simulations for Proton and Positron Beams (ECLOUD'02) organized by the SL Accelerator Physics Group at CERN.

    CERN Multimedia

    Patrice Loïez

    2002-01-01

    This workshop was organized by the SL Accelerator Physics group at CERN from 15 to 18 April 2002. More than 60 participants from 17 institutes reflect the great worldwide interest in the electron-cloud phenomenon, which presently limits the performance of several storage rings and has become a concern for the LHC.

  18. Spotlight on CERN

    CERN Multimedia

    CERN video productions

    2009-01-01

    Welcome to the Globe of Science and Innovation for the first "Spotlight on CERN" just a few weeks before the restart of the LHC machine. Today our guest is Mike Lamont, who is in charge of the Operations Group for the accelerator beams. This weekend, protons were injected into the LHC for the first time since September 2008. But before we talk about that, let's go back a few weeks and look at the previous stage, which involved testing the transfer lines of the injection tunnels TI2/TI8. Our video team was there to film this operation.

  19. CERN: TeV Electron-Positron Linear Collider Studies; More polarization in LEP

    International Nuclear Information System (INIS)

    The world's highest energy electronpositron collider - CERN's LEP, with a circumference of 27 kilometres - will also be the last such machine to be built as a storage ring. With interest growing in electronpositron physics at energies beyond those attainable at LEP, the next generation of electron-positron colliders must be linear if prohibitive synchrotron radiation power losses are to be avoided. Very high energy linear colliders present many technical challenges but mastery of SLC at Stanford, the world's first electron-positron linear collider, is encouraging. The physics issues of a linear collider have been examined by the international community in ICFA workshops in Saariselka, Finland (September 1991) and most recently in Hawaii (April 1993). The emerging consensus is for a collider with an initial collision energy around 500 GeV, and which can be upgraded to over 1 TeV. A range of very different collider designs are being studied at Laboratories in Europe, the US, Japan and Russia. Following the report of the 1987 CERN Long Range Planning Committee chaired by Carlo Rubbia, studies for a 2 TeV linear collider have progressed at CERN alongside work towards the Laboratory's initial objective - the LHC high energy proton-proton collider in the LEP tunnel

  20. Sixty Days Remaining, Forty Years of CERN, Two Brothers, One Exclusive Interview

    CERN Multimedia

    2001-01-01

    Twins Marcel and Daniel Genolin while sharing memories of their CERN experiences, point out just how much smaller the Meyrin site once was. In a place such as CERN where the physical sciences are in many ways the essence of our daily lives and where technological advancement is an everyday occurrence, it is easy to lose track of the days, months, and even years. But last week twin brothers, Daniel and Marcel Genolin, hired in the early sixties and getting ready to end their eventful forty year CERN experiences, made it clear that the winds of time bluster past us whether we are aware or not. 'CERN was very small when we started' says Marcel, who has worked in transport during his entire time here. A lot has changed. 'When I got here there were no phones in peoples' houses' he recalls,'when there were problems in the control room with the PS (Proton Synchrotron) they used to get a megaphone and tell us {the transport service} to go and get the necessary physicists from their homes in the area. We had to lo...

  1. CERN choir

    CERN Multimedia

    2004-01-01

    Don't forget a special performance of Joseph Haydn's Creation, an oratorio in three parts, given by the CERN choir and the Annecy choir Pro Musica, this Sunday at 8.30 p.m. at the Grand Casino. Tickets (38 CHF) are available at Fnac Rive and Balexert.

  2. Robot adventures at CERN

    CERN Multimedia

    2015-01-01

    Imagine if the CERN robots had an end-of-year party... From retrieving data tapes to handling material safely, the robots at CERN fulfill numerous tasks. Find out more: http://cern.ch/go/VjX7 Produced by: CERN Video Productions Director: Christoph M. Madsen Copyright © 2015 CERN. Terms of use: http://copyright.web.cern.ch/

  3. Design of Normal-conducting Quadrupole Magnets for Linac4 at CERN

    CERN Document Server

    Vanherpe, L; Vorozhtsov, A; Zickler, T

    2014-01-01

    Linac4 is the first element of the LHC Injectors Upgrade Project and will replace the existing Linac2 as linear injector of protons for the CERN accelerators. A new transfer line will link Linac4 to the Proton Synchrotron Booster (PSB). Approximately hundred normal-conducting electro-magnets are required for beam steering and focusing along the linac and the transfer line. This text concentrates on the design of the Linac4 quadrupole magnets. The design and the first magnetic measurements of the inter-tank quadrupole electro-magnets are discussed. In addition, the design and optimization of the transfer line quadrupole magnets are highlighted. The compatibility of the magnetic requirements and the power converter constraints for the latter magnet type is assessed.

  4. Results from the CERN pilot CLOUD experiment

    CERN Document Server

    Duplissy, J; Reichl, U; Winkler, P M; Pedersen, E; Makhmutov, V; Viisanen, Y; Kulmala, M; Wilhelmsson, M; Weingartner, E; Avngaard, M; Curtius, J; Veenhof, R; Laakso, L; Gagne, S; Harrison, R G; Sipila, M; David, A; Seinfeld, J H; Nieminen, T; Verheggen, B; Aplin, K L; Stratmann, F; Arnold, F; Makela, J; Kellett, B; Fastrup, B; Marsh, N D; Lockwood, M; Carslaw, K; Wehrle, G; Aufmhoff, H; Pedersen, J O P; Baltensperger, U; Onnela, A; Laaksonen, A; Enghoff, M B; Svensmark, J; Wex, H; Lillestol, E; Wagner, P E; Kirkby, J; Stozhkov, Y; Polny, J; Bondo, T; Bingham, R; Svensmark, H

    2010-01-01

    During a 4-week run in October-November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm detection threshold of between 0.1 and 100 cm(-3) s(-1), and growth rates between 2 and 37 nm h(-1). The corresponding H2SO4 concentrations were typically around 10(6) cm(-3) or less. The experimentally-measured formation rates and H2SO4 concentrations are comparable to those found in the atmosphere, supporting the idea that sulphuric acid is involved in the nucleation of atmospheric aerosols. However, sulphuric acid...

  5. CERN tests largest superconducting solenoid magnet

    CERN Multimedia

    2006-01-01

    "CERN's Compacts Muon Solenoid (CMS) - the world's largest superconducting solenoid magnet - has reached full field in testing. The instrument is part of the proton-proton Large Hadron Collider (LHC) project, located in a giant subterranean chamber at Cessy on the Franco-Swiss border." (1 page)

  6. Crystal structure and bonding analysis of the first dinuclear calcium(II)-proton-pump inhibitor (PPI) `butterfly molecule': a combined microcrystal synchrotron and DFT study.

    Science.gov (United States)

    Cong, Hengjiang

    2016-04-01

    Proton-pump inhibitors (PPI) are prodrugs used widely to treat acid-related diseases since the late 1980s. After an extensive research effort it has become clear that the fundamental interactions between metal atoms and PPIs are of paramount importance for both drug release and long-term therapeutic safety. Unfortunately, until now, very little information has been available on this topic. In this paper, we report the crystal structure analysis of a novel calcium-PPI compound incorporating bridging and terminal deprotonated (R)-rabeprazole tricyclic ligands (L), namely bis[μ-(R)-2-({[4-(3-methoxypropoxy)-3-methylpyridin-2-yl]methyl}sulfinyl)-6,7-dihydro-3H-benzofuro[5,6-d]imidazol-1-ido]bis{dimethanol[(R)-2-({[4-(3-methoxypropoxy)-3-methylpyridin-2-yl]methyl}sulfinyl)-6,7-dihydro-3H-benzofuro[5,6-d]imidazol-1-ido]calcium(II)} methanol hexasolvate, [Ca2(C20H22N3O4S)4(CH3OH)4]·6CH3OH or [Ca2(L)4(CH3OH)4]·6CH3OH, which crystallizes from methanol in the polar C2 space group. Using low-temperature microcrystal synchrotron radiation, we demonstrate that this compound is in the form of a beautiful `butterfly molecule', consisting of a C2-symmetric dinuclear (CH3OH)2LCa(II)(μ2-L)2Ca(II)L(HOCH3)2 framework. A large amount of disorder is found within the bridging L ligand and the conformation of the fused tetrahydrofuran ring exhibits great variety. All the sulfinyl groups remain intact and the nonbonded Ca...Ca distance is significantly longer than in other calcium dimers, indicating steric hindrance in the bridging ligands. Considerable hydrogen bonding and aromatic C-H...π interactions co-operate to stabilize the whole complex, as well as to facilitate supramolecular assembly. Additional investigations into the bond nature were made using density functional theory (DFT) methods at the B3LYP/6-31G(d) level; geometry optimization, Mulliken atomic charges, MEP (molecular electrostatic potential), HOMO-LUMO (highest occupied molecular orbital-lowest unoccupied molecular

  7. Measurements of charged pion differential yields from the surface of the T2K replica target for incoming 31 GeV/c protons with the NA61/SHINE spectrometer at the CERN SPS

    CERN Document Server

    Abgrall, N; Ajaz, M; Ali, Y; Andronov, E; Anticic, T; Antoniou, N; Baatar, B; Bay, F; Blondel, A; Blümer, J; Bogomilov, M; Brandin, A; Bravar, A; Brzychczyk, J; Bunyatov, S A; Busygina, O; Christakoglou, P; Cirkovic, M; Czopowicz, T; Davis, N; Debieux, S; Dembinski, H; Deveaux, M; Diakonos, F; Di Luise, S; Dominik, W; Dumarchez, J; Dynowski, K; Engel, R; Ereditato, A; Feofilov, G A; Fodor, Z; Garibov, A; Gazdzicki, M; Golubeva, M; Grebieszkow, K; Grzeszczuk, A; Guber, F; Haesler, A; Hasegawa, T; Hervé, A E; Hierholzer, M; Igolkin, S; Ivashkin, A; Johnson, S R; Kadija, K; Kapoyannis, A; Kaptur, E; Kisiel, J; Kobayashi, T; Kolesnikov, V I; Kolev, D; Kondratiev, V P; Korzenev, A; Kowalik, K; Kowalski, S; Koziel, M; Krasnoperov, A; Kuich, M; Kurepin, A; Larsen, D; László, A; Lewicki, M; Lyubushkin, V V; Mackowiak-Pawłowska, M; Maksiak, B; Malakhov, A I; Manic, D; Marcinek, A; Marino, A D; Marton, K; Mathes, H -J; Matulewicz, T; Matveev, V; Melkumov, G L; Messerly, B; Mills, G B; Morozov, S; Mrówczynski, S; Nagai, Y; Nakadaira, T; Naskret, M; Nirkko, M; Nishikawa, K; Panagiotou, A D; Paolone, V; Pavin, M; Petukhov, O; Pistillo, C; Płaneta, R; Popov, B A; Posiadała-Zezula, M; Puławski, S; Puzovic, J; Rauch, W; Ravonel, M; Redij, A; Renfordt, R; Richter-Was, E; Robert, A; Röhrich, D; Rondio, E; Roth, M; Rubbia, A; Rumberger, B T; Rustamov, A; Rybczynski, M; Sadovsky, A; Sakashita, K; Sarnecki, R; Schmidt, K; Sekiguchi, T; Selyuzhenkov, I; Seryakov, A; Seyboth, P; Sgalaberna, D; Shibata, M; Słodkowski, M; Staszel, P; Stefanek, G; Stepaniak, J; Ströbele, H; Šuša, T; Szuba, M; Tada, M; Taranenko, A; Tefelska, A; Tefelski, D; Tereshchenko, V; Tsenov, R; Turko, L; Ulrich, R; Unger, M; Vassiliou, M; Veberic, D; Vechernin, V V; Vesztergombi, G; Vinogradov, L; Wilczek, A; Włodarczyk, Z; Wojtaszek-Szwarc, A; Wyszynski, O; Yarritu, K; Zambelli, L; Zimmerman, E D; Friend, M; Galymov, V; Hartz, M; Hiraki, T; Ichikawa, A; Kubo, H; Matsuoka, K; Murakami, A; Nakaya, T; Suzuki, K; Tzanov, M; Yu, M

    2016-01-01

    Measurements of particle emission from a replica of the T2K 90 cm-long carbon target were performed in the NA61/SHINE experiment at CERN SPS, using data collected during a high-statistics run in 2009. An efficient use of the long-target measurements for neutrino flux predictions in T2K requires dedicated reconstruction and analysis techniques. Fully-corrected differential yields of charged pions from the surface of the T2K replica target for incoming 31 GeV/c protons are presented. A possible strategy to implement these results into the T2K neutrino beam predictions is discussed and the propagation of the uncertainties of these results to the final neutrino flux is performed

  8. Passive beam sprending systems and light-weight gentries for synchrotron based hadron therapy

    CERN Document Server

    Maier, A T

    1998-01-01

    Hadron therapy is a promising technique that uses beams of protons or light ions for the treatment of cancer. In order to open this technique to a wider application, hospital based treatment centres are now needed. The extbf{P}roton- extbf{I}on extbf{M}edical extbf{M}achine extbf{S}tudy (PIMMS) in CERN is concerned with the design of such a centre that would use both protons and light ions. The dual species operation makes it preferable to base the centre on a synchrotron. The present thesis is concerned with the beam delivery for the protons. After introducing the basic vocabulary of linear beam optics, the feasibility of a light-weight gantry with passive beam spreading fed by a synchrotron is investigated. The device is a non-linear magnetic structure, which can be described as a emph{magnetic guide} or as a emph{proton pipe}. Detailed studies show that while it is possible to design an optically stable 270$^circ$ section, which would be necessary for a gantry, the properties do not fulfil the requirements...

  9. Experimental study of CR and CP invariances in short-distance proton-antiproton collisions, at the CERN storage rings (I.S.R.)

    International Nuclear Information System (INIS)

    The R608 experiment was performed at C.E.R.N.-I.S.R. Here, we compared inclusive reactions for the production at 90 degrees of a single pion (or kaon) at SQRT (s) equal to 52.7 GeV, in proton-proton and proton-antiproton collisions. The acceptances are given from Monte-Carlo calculations. We check carefully the working and the stability of the experimental apparatus. The particles are identified by using silica aerogel counters. We give two kinds of physical results: The comparison of inclusive invariant cross sections for production of pions plus and minus in the transverse momentum range 0.63 to 2.23 GeV/c. No significant difference appears in proton-proton and proton-antiproton reactions. We give a single fit for the four processes corresponding to the intermediate zone between those one described by thermodynamic models and parton models; the test of CR and CP invariances for proton-antiproton collisions in the production of a single pion or kaon at 90 degrees in the centre of mass system, for the transverse momentum range 0.35 to 2.23 GeV/c. Statistical tests from pions minus and plus give the maximum limit for the relative violation amplitudes. The measurement of the asymmetry parameters leads to the determination of these relative amplitudes. The final weighted mean is the more precise up to date with an order of magnitude higher for the available total energy. It is not necessary to call short distance phenomena and the upper limit for the violation is lower than 3/1000

  10. Induction synchrotron and its applications

    International Nuclear Information System (INIS)

    An RF synchrotron has been the indispensable device for nuclear physics and high energy physics experiments so far. Instead of this conventional accelerator, an induction synchrotron has been proposed and its demonstration is going to be done in the near future. The induction synchrotron is capable of accelerating a super-bunch of 1 μs long. A new generation of proton driver or hadron collider accommodating super-bunches, which claims to increase their luminosity ten times larger, is under consideration. Key devices to realize the novel induction synchrotron are a pulse modulator and induction accelerating cavity being operated at 1 MHz rep-rate. The concept and characteristics of the induction synchrotron are presented including the outline of R and D works. (author)

  11. The "Silicon Wheel" prototype for the barrel of the silicon tracker deep inside the CMS detector at CERN'S future LHC proton collider

    CERN Multimedia

    Laurent Guiraud

    1997-01-01

    Elements on a specially designed structure will track the emerging particles close to the beam pipe. The supporting structure is made out of special carbon fibre discs holding 112 detector modules (448 individual silicon detectors). The modules are arranged to provide three detection points per track and are distributed in seven layers on a spiral geometry to leave enough room for cables, cooling tubes, etc. The inner radius of the wheel is 20.5 cm; the overall diameter is 80 The prototype is a combined CMS silicon community effort; the main participating institutions were: Aachen (Germany), Bari (Italy), CERN, Florence (Italy), Imperial College (UK), Oulu (Finland), Padova, Perugia, Pisa (Italy), Rutherford Laboratory

  12. submitter Radiation Protection Studies for CERN LINAC4/SPL Accelerator Complex

    CERN Document Server

    Mauro, Egidio; Silari, Marco

    2009-01-01

    CERN is presently designing a new chain of accelerators to replace the present Proton Synchrotron (PS) complex: a 160 MeV room-temperature H$^-$ linac (Linac4) to replace the present 50 MeV proton linac injector, a 3.5 GeV Superconducting Proton Linac (SPL) to replace the 1.4 GeV PS booster (PSB) and a 50 GeV synchrotron (named PS2) to replace the 26 GeV PS. Linac4 has been funded and the civil engineering work started in October 2008, whilst the SPL is in an advanced stage of design. Beyond injecting into the future 50 GeV PS, the ultimate goal of the SPL is to generate a 4 MW beam for the production of intense neutrino beams. The radiation protection design is driven by the latter requirement. This thesis summarizes the radiation protection studies conducted for Linac4. FLUKA Monte Carlo simulations, complemented by analytical estimates, were performed 1) to evaluate the propagation of neutrons through the waveguide, ventilation and cable ducts placed along the accelerator, 2) to estimate the radiological i...

  13. Synchrotron radiation

    International Nuclear Information System (INIS)

    The paper on Synchrotron Radiation contains the appendix to the Daresbury Annual Report 1987/88. The appendix is mainly devoted to the scientific progress reports on the work at the Synchrotron Radiation Source in 1987/8. The parameters of the Experimental Stations and the index to the Scientific Reports are also included in the appendix. (U.K.)

  14. Princess of Thailand returns to CERN

    CERN Multimedia

    Stefania Pandolfi

    2015-01-01

    On Tuesday, 17 November 2015, HRH Princess Maha Chakri Sirindhorn of Thailand visited CERN. Princess Sirindhorn was visiting the Laboratory for the fifth time, following her last visit in 2010.   Princess Maha Chakri Sirindhorn of Thailand (center) witnesses the signing of the collaboration agreement between CERN and SLRI, represented by Rolf Heuer (right) and Professor Sarawut Sujitjorn (left) respectively. The Princess was accompanied by a delegation that included the Director of the Synchrotron Light Research Institute (SLRI) in Thailand, Professor Sarawut Sujitjorn, and a large group of Thailand’s Diplomatic Representatives in Switzerland. Upon her arrival, Princess Sirindhorn was welcomed by CERN Director-General Rolf Heuer and the Director-General Designate, Fabiola Gianotti. At CERN, the Princess was given a brief update on the Laboratory’s activities since her last visit, in April 2010. Later on, she witnessed the signature of the f...

  15. Comparison of two methods for minimizing the effect of delayed charge on the dose delivered with a synchrotron based discrete spot scanning proton beam

    International Nuclear Information System (INIS)

    Purpose: Delayed charge is a small amount of charge that is delivered to the patient after the planned irradiation is halted, which may degrade the quality of the treatment by delivering unwarranted dose to the patient. This study compares two methods for minimizing the effect of delayed charge on the dose delivered with a synchrotron based discrete spot scanning proton beam. Methods: The delivery of several treatment plans was simulated by applying a normally distributed value of delayed charge, with a mean of 0.001(SD 0.00025) MU, to each spot. Two correction methods were used to account for the delayed charge. Method one (CM1), which is in active clinical use, accounts for the delayed charge by adjusting the MU of the current spot based on the cumulative MU. Method two (CM2) in addition reduces the planned MU by a predicted value. Every fraction of a treatment was simulated using each method and then recomputed in the treatment planning system. The dose difference between the original plan and the sum of the simulated fractions was evaluated. Both methods were tested in a water phantom with a single beam and simple target geometry. Two separate phantom tests were performed. In one test the dose per fraction was varied from 0.5 to 2 Gy using 25 fractions per plan. In the other test the number fractions were varied from 1 to 25, using 2 Gy per fraction. Three patient plans were used to determine the effect of delayed charge on the delivered dose under realistic clinical conditions. The order of spot delivery using CM1 was investigated by randomly selecting the starting spot for each layer, and by alternating per layer the starting spot from first to last. Only discrete spot scanning was considered in this study. Results: Using the phantom setup and varying the dose per fraction, the maximum dose difference for each plan of 25 fractions was 0.37–0.39 Gy and 0.03–0.05 Gy for CM1 and CM2, respectively. While varying the total number of fractions, the maximum dose

  16. 1984 CERN school of physics

    International Nuclear Information System (INIS)

    The CERN School of Physics is intended to give young experimental physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These Proceedings contain reports of lecture series on the following topics: proton antiproton physics, experimental tests of gauge theories, QCD, phenomenology of Higgs particles, the electroweak model, unification and supersymmetry. In addition, there is a report of a special lecture on elementary supersymmetry. See hints under the relevant topics. (orig./HSI)

  17. UK @ CERN

    CERN Multimedia

    FI Department

    2008-01-01

    17 – 18 November 2008 9.00 a.m. - 5.00 p.m. on Monday 17 November 9.00 a.m. - 5.00 p.m. on Tuesday 18 November Individual meetings will take place in the technicians’ or engineers’ offices. The companies will contact relevant users/technicians but anyone wishing to arrange an appointment with a specific company can contact Caroline Laignel (mailto:caroline.laignel@cern.ch, tel. 73722). A list of the companies is available from all departmental secretariats and on the web at: http://fi-dep.web.cern.ch/fi-dep/structure/memberstates/exhibitions_visits.htm List of companies: 1. Caburn MDC Europe Ltd. 2. Croft Engineering Services 3. Cryox Ltd. 4. Goodfellow Cambridge Ltd. 5. Gravatom Engineering Systems Ltd. 6. High Voltage Technology 7. Lilco Ltd. 8. Micro Metalsmiths Ltd. 9. Photek Ltd. 10. Shadow Robot Company 11. Sundance Multiprocessor Technology Ltd. 12. Tessella plc 13. Thermal Resources Management Ltd. 14. Torr Scientific Ltd. For further information please contact Mrs C. Laignel, FI-DI, tel. 7372...

  18. CERN moves to http://home.cern

    CERN Multimedia

    2015-01-01

    A new top-level domain for CERN will be inaugurated next week, with the migration of the core website to http://home.cern.   The new home.cern webpage. The .cern top-level domain is intended for the exclusive use of CERN and its affiliates, and will soon be open for applications from within the community. Clear governance mechanisms for registration and management of .cern domains have been put in place. Applications for domains may be submitted by current members of the CERN personnel, and must be sponsored by a CERN entity such as a department, experiment, project or CERN-recognised experiment. For more information please refer to the registration policy. The acquisition of the .cern top-level domain was negotiated via ICANN’s new gTLD programme by a board comprising members of the CERN Legal Service, Communications group and IT department. .cern is one of over 1,300 new top-level domains that will launch over the coming months and years. The .cern domain nam...

  19. Operational experience with the CERN hadron linacs

    International Nuclear Information System (INIS)

    The present CERN proton linac (Linac2) was commissioned in 1978 and since that date has been the primary source of protons to the CERN accelerator complex. During the past 18 years, the machine has had a very good reliability record in spite of the demands made upon it. Modifications have been made with the view of maintaining this reliability with reduced resources and new requirements from the users. Further demands will be made in the future for LHC operation. In 1994, a new linac for heavy ion production was put into service replacing the original CERN proton linac. As this machine was built within an international collaboration, operation had to take into account the novelty of the techniques used and the variety of equipment supplied by outside collaborators. Even so, the new machine has also had very good reliability. (author)

  20. Synchrotron light

    International Nuclear Information System (INIS)

    'Synchrotron Light' is an interactive and detailed introduction to the physics and technology of the generation of coherent radiation from accelerators as well as to its widespread high-tech applications in science, medicine and engineering. The topics covered are the interaction of light and matter, the technology of synchrotron light sources, spectroscopy, imaging, scattering and diffraction of X-rays, and applications to materials science, biology, biochemistry, medicine, chemistry, food and pharmaceutical technology. All synchrotron light facilities are introduced with their home-page addresses. 'Synchrotron Light' provides an instructive and comprehensive multimedia learning tool for students, experienced practitioners and novices wishing to apply synchrotron radiation in their future work. Its multiple-entry points permit an easy exploration of the CD-Rom according to the users knowledge and interest. 2-D and 3-D animations and virtual reconstruction with computer-generated images guide visitors into the scientific and technical world of a synchrotron and into the applications of synchrotron radiation. This bilingual (English and French) CD-Rom can be used for self-teaching and in courses at various levels in physics, chemistry, engineering, and biology. (author)

  1. Experimental demonstration of the KEK induction synchrotron

    International Nuclear Information System (INIS)

    Recent progress in the KEK induction synchrotron is presented. In the recent experiment, by using a newly developed induction acceleration system instead of radio-wave acceleration devices, a single proton bunch injected from the 500 MeV Booster ring and captured by the barrier bucket created by the induction step-voltages was accelerated to 6 GeV in the KEK proton synchrotron

  2. What's new @CERN ?

    CERN Multimedia

    CERN video productions

    2011-01-01

    Le 30 mars 2010 – une date désormais gravée dans le marbre – le jour où le LHC, le grand collisionneur de hadrons, soit le plus puissant accélérateur de particules au monde a commencé à fonctionner à des énergies inédites. Depuis, les collisions s’enchainent avec la promesse de découvertes. Dans cette édition de What’s new at CERN?, nous allons faire le bilan des performances de cette machine et parler de son mode d’exploitation qui va changer dans quelques jours. Les mots clés de cette émission ? Performances – expériences – ions - protons - avenir Tout cela en compagnie de Steve Myers, directeur du CERN pour les accélérateurs et la technologie, et de Yves Schutz, physicien de l’expérience ALICE.

  3. Synchrotron radiation

    International Nuclear Information System (INIS)

    A detailed account of the research work associated with the Synchrotron Radiation Source at Daresbury Laboratory, United Kingdom, in 1984/85, is presented in the Appendix to the Laboratory's Annual Report. (U.K.)

  4. Synchrotron radiation

    International Nuclear Information System (INIS)

    Synchrotron radiation has had a revolutionary effect on a broad range of scientific studies, from physics, chemistry and metallurgy to biology, medicine and geoscience. The situation during the last decade has been one of very rapid growth, there is a great vitality to the field and a capability has been given to a very broad range of scientific disciplines which was undreamt of just a decade or so ago. In this paper, the authors discuss some of the properties of synchrotron radiation that makes it so interesting and something of the sources in existence today including the National Synchrotron Light Source (NSLS). The NSLS is one of the new facilities built specifically for synchrotron radiation research and the model that was developed there for involvement of the scientific community is a good one which provides some good lessons for these facilities and others

  5. Synchrotron radiation

    International Nuclear Information System (INIS)

    A report is given on the work involving the Synchrotron Radiation Division of the Daresbury Laboratory during the period January 1981 - March 1982. Development of the source, beamlines and experimental stations is described. Progress reports from individual investigators are presented which reveal the general diversity and interdisciplinary nature of the research which benefits from access to synchrotron radiation and the associated facilities. Information is given on the organisation of the Division and publications written by the staff are listed. (U.K.)

  6. Synchrotron radiation

    International Nuclear Information System (INIS)

    The paper on synchrotron radiation is the appendix to the Daresbury (United Kingdom) annual report, 1985/86. The bulk of the volume is made up of the progress reports for the work carried out during the year under review using the Synchrotron Radiation Source (SRS) at Daresbury. The Appendix also contains: the scientific programmes at the the SRS, progress on beamlines, instrumentation and computing developments, and activities connected with accelerator development. (U.K.)

  7. Proton-antiproton elastic scattering at four-momentum transfer up to 0.5 GeV2 at the CERN SPS collider

    International Nuclear Information System (INIS)

    Proton-antiproton elastic scattering was measured at a centre of mass energy √s = 540 GeV. In the four-momentum transfer range 0.21 2 the t-distribution of about 7000 events is well represented by the exponential shape exp (bt) with slope parameter b = 13.7 +- 0.3 GeV-2. A new measurement of the slope for - t 2 confirms our earlier result, giving evidence for a change of slope of about 4 GeV-2 around - t approx.= 0.15 GeV2. (orig.)

  8. Rf cavity primer for cyclic proton accelerators

    International Nuclear Information System (INIS)

    The purpose of this note is to describe the electrical and mechanical properites of particle accelerator rf cavities in a manner which will be useful to physics and engineering graduates entering the accelerator field. The discussion will be limited to proton (or antiproton) synchrotron accelerators or storage rings operating roughly in the range of 20 to 200 MHz. The very high gradient, fixed frequency UHF or microwave devices appropriate for electron machines and the somewhat lower frequency and broader bandwidth devices required for heavy ion accelerators are discussed extensively in other papers in this series. While it is common pratice to employ field calculation programs such as SUPERFISH, URMEL, or MAFIA as design aids in the development of rf cavities, we attempt here to elucidate various of the design parameters commonly dealt with in proton machines through the use of simple standing wave coaxial resonator expressions. In so doing, we treat only standing wave structures. Although low-impedance, moderately broad pass-band travelling wave accelerating systems are used in the CERN SPS, such systems are more commonly found in linacs, and they have not been used widely in large cyclic accelerators. Two appendices providing useful supporting material regarding relativistic particle dynamics and synchrotron motion in cyclic accelerators are added to supplement the text

  9. Rf cavity primer for cyclic proton accelerators

    Science.gov (United States)

    Griffin, J. E.

    1988-04-01

    The electrical and mechanical properities of particle accelerator rf cavities are described in a manner which will be useful to physics and engineering graduates entering the accelerator field. The discussion is limited to proton (or antiproton) synchrotron accelerators or storage rings operating roughly in the range of 20 to 200 MHz. The very high gradient, fixed frequency UHF or microwave devices appropriate for electron machines and the somewhat lower frequency and broader bandwidth devices required for heavy ion accelerators are discussed extensively in other papers in this series. While it is common practice to employ field calculation programs such as SUPERFISH, URMEL, or MAFIA as design aids in the development of rf cavities, we attempt here to elucidate various of the design parameters commonly dealt with in proton machines through the use of simple standing wave coaxial resonator expressions. In so doing, we treat only standing wave structures. Although low-impedance, moderately broad pass-band travelling wave accelerating systems are used in the CERN SPS, such systems are more commonly found in linacs, and they have not been used widely in large cyclic accelerators. Two appendices providing useful supporting material regarding relativistic particle dynamics and synchrotron motion in cyclic accelerators are added to supplement the text.

  10. UK @ CERN

    CERN Multimedia

    FI Department

    2008-01-01

    17 – 18 November 2008 9.00 a.m. - 5.00 p.m. on Monday 17 November 9.00 a.m. - 5.00 p.m. on Tuesday 18 November Individual meetings will take place in the technicians’ or engineers’ offices. The companies will contact relevant users/technicians but anyone wishing to arrange an appointment with a specific company can contact Caroline Laignel (caroline.laignel@cern.ch, tel. 73722). A list of the companies is available from all departmental secretariats and on the web here. List of companies: 1. Caburn MDC Europe Ltd. 2. Croft Engineering Services 3. Cryox Ltd. 4. Goodfellow Cambridge Ltd. 5. Gravatom Engineering Systems Ltd. 6. High Voltage Technology 7. Lilco Ltd. 8. Micro Metalsmiths Ltd. 9. Photek Ltd. 10. Shadow Robot Company 11. Sundance Multiprocessor Technology Ltd. 12. Tessella plc 13. Thermal Resources Management Ltd. 14. Torr Scientific Ltd. For further information please contact Mrs C. Laignel, FI-DI, tel. 73722.

  11. Measurements of π±, K±, KS0, Λ and proton production in proton-carbon interactions at 31 GeV/c with the NA61/SHINE spectrometer at the CERN SPS

    International Nuclear Information System (INIS)

    Measurements of hadron production in p + C interactions at 31 GeV/c are performed using the NA61/SHINE spectrometer at the CERN SPS. The analysis is based on the full set of data collected in 2009 using a graphite target with a thickness of 4 % of a nuclear interaction length. Inelastic and production cross sections as well as spectra of π±, K±, p, KS0 and Λ are measured with high precision. These measurements are essential for improved calculations of the initial neutrino fluxes in the T2K long-baseline neutrino oscillation experiment in Japan. A comparison of the NA61/SHINE measurements with predictions of several hadroproduction models is presented. (orig.)

  12. MERIT - The high intensity liquid mercury target experiment at the CERN PS

    CERN Document Server

    Efthymiopoulos, I

    2009-01-01

    The MERIT experiment is a proof-of-principle test of a target system for high power proton beams to be used as front-end for a Neutrino Factory complex or a Muon Collider. The experiment took data in autumn 2007 with the fast extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of about 30 × 1012 protons per pulse. The target system, based on a free mercury jet, allowed investigation of the interseption of a 4-MW proton beam inside a 15-T magnetic field required to capture the low-energy secondary pions as the source of the required intense muon beams. Particle detectors have been installed around the target setup to measure the secondary particle flux out of the target and probe cavitation effects in the mercury jet when exited with a beam of variable intensity. With the analysis of the data ongoing, results will be presented here that demonstrate the validity of the liquid target concept.

  13. The ELENA project at CERN

    CERN Document Server

    Oelert, W

    2015-01-01

    CERN has a longstanding tradition of pursuing fundamental physics on extreme low and high energy scales. The present physics knowledge is successfully described by the Standard Model and the General Relativity. In the anti-matter regime many predictions of this established theory still remain experimentally unverified and one of the most fundamental open problems in physics concerns the question of asymmetry between particles: why is the observable and visible universe apparently composed almost entirely of matter and not of anti-matter? There is a huge interest in the very compelling scientiic case for anti-hydrogen and low energy anti-proton physics, here to name especially the Workshop on New Opportunities in the Physics Landscape at CERN which was convened in May 2009 by the CERN Directorate and culminated in the decision for the final approval of the construction of the Extra Low ENergy Antiproton (ELENA) ring by the Research Board in June 2011. ELENA is a CERN project aiming to construct a small 30 m ci...

  14. The present status of the n-TOF facility at CERN

    International Nuclear Information System (INIS)

    The main aim of the n-TOF facility at CERN is to provide precise neutron cross-section data relevant to the R and D of accelerator driven systems, nuclear astrophysics, etc. It is composed of a spallation neutron source, a 187.5-m flight path, a variety of detectors, a data acquisition system, etc. A 20 GeV proton synchrotron is employed together with a lead target for the spallation neutron source. The measurement of capture and fission cross sections started in 2002 and had been performed until the mid of November in 2004. The capture and fission measurements were performed for 28 and 7 isotopes, respectively. The brief history, present status, and future plan of the n-TOF facility are reported. (author)

  15. Measurement of the multiplicity dependence of charm production in proton--proton collisions at $\\sqrt{s}$=7 TeV with the ALICE experiment at the CERN-LHC

    CERN Document Server

    Rauf, Aamer Wali

    2013-01-01

    Potential of the charm quark as a probe to study the Quark-Gluon Plasma (QGP) is best harnessed when its production mechanisms are disentangled from its propagation through the QGP. Proton-proton (pp) collisions help us to study charmed hadron production mechanisms. The measurement of D-meson yields in pp collisions as a function of the multiplicity of produced particles allows one to gain some insight into the processes occurring in the collision at a microscopic level. Here, the preliminary results are presented from this measurement at \\sqrt{s} = 7 TeV. The analysis strategy, the applied corrections, and the determination of the systematic uncertainties are described. The preliminary results are presented and compared with those from a similar, published, measurement of J/\\psi production.

  16. Google Science Fair winner visits CERN

    CERN Multimedia

    Katarina Anthony

    2012-01-01

    Google Science Fair Grand Prize winner Brittany Michelle Wenger today wrapped up a day-and-a-half's visit of the CERN site. Her winning project uses an artificial neural network to diagnose breast cancer – a non-invasive technique with significant potential for use in hospitals.   Brittany Michelle Wenger at CERN's SM18 Hall. Besides winning a $50,000 scholarship from Google and work experience opportunities with some of the contest hosts, Brittany was offered a personal tour of CERN. “This visit has just been incredible,” she says. “I got to speak with [CERN's Director for Accelerators and Technology] Steve Myers about some of the medical applications and technologies coming out of the LHC experiments and how they can be used to treat cancer. We talked about proton therapy and hadron therapy, which could really change the way patients are treated, improving success rates and making treatment not such an excruciating process. That ...

  17. Hangout with CERN: Welcome to CERN (S01E01)

    CERN Multimedia

    Kahle, Kate

    2012-01-01

    In this first Hangout with CERN "Welcome to CERN" ATLAS physicist Steven Goldfarb, CERN theorist Alvaro De Rujula and Mick Storr from the CERN education group introduce CERN and answer some of the questions received via #askCERN on Twitter and Google+. Recorded live on 1st November 2012.

  18. Virgin Galactic explores CERN

    CERN Multimedia

    2016-01-01

    Virgin Galactic visited CERN with a group of future astronauts and Sir Richard Branson. During their visit the group was shown around various experiments, including the Globe, SM18, AMS and the CERN Control Centre.

  19. Doing business with CERN

    CERN Multimedia

    2015-01-01

    The Procurement Service, in collaboration with the Communications group’s Design team, has recently launched a new information campaign targeted at companies wishing to supply their products and services to CERN. This campaign comprises:   A brochure, available in hard and soft copy:  http://procurement.web.cern.ch/brochures/doing-business-with-cern.   A 6-minute video overview: https://procurement-dev.web.cern.ch/doing-business-with-cern. This campaign is intended for Member State firms with whom CERN is yet to do business. The key objectives are: To emphasise that CERN can be considered a major customer across a wide range of activities;   To present CERN’s procurement procedures in a dynamic and digestible way;   To highlight the information available on CERN’s procurement website: http://procurement.web.cern.ch. Furthermore, a new section called “Having a contract with CERN” is also now ava...

  20. CERN Shop Christmas Sale

    CERN Multimedia

    Visits & Exhibition Service/ETT-VE

    2001-01-01

    11-13.12.2001 Looking for Christmas present ideas? Come to the Reception Shop Special Stand in Meyrin, Main Building, ground floor, from Tuesday 11 to Thursday 13 December from 10.30 to 16.00. CERN Calendar 10.- CERN Sweat-shirts(M, L, XL) 30.- CERN T-shirt (M, L, XL) 20.- New CERN silk tie (2 colours) 35.- Fancy silk tie (blue, bordeau) 25.- Silk scarf (light blue, red, yellow) 35.- Swiss army knife with CERN logo 25.- CERN watch 25.- CERN baseball cap 15.- CERN briefcase 15.- Book 'Antimatter' (English) 35.- Book 'How the web was born' (English) 25.- The Search for Infinity (French, Italian, English, German) 40.-   If you miss this special occasion, the articles are also available at the Reception Shop in Building 33 from Monday to Saturday between 08.30 and 17.30 hrs.

  1. Multipole correction in large synchrotrons

    International Nuclear Information System (INIS)

    A new method of correcting dynamic nonlinearities due to the multipole content of a synchrotron such as the Superconducting Super Collider is discussed. The method uses lumped multipole elements placed at the center (C) of the accelerator half-cells as well as elements near the focusing (F) and defocusing (D) quads. In a first approximation, the corrector strengths follow Simpson's Rule. Correction of second-order sextupole nonlinearities may also be obtained with the F, C, and D octupoles. Correction of nonlinearities by about three orders of magnitude are obtained, and simple solutions to a fundamental problem in synchrotrons are demonstrated. Applications to the CERN Large Hadron Collider and lower energy machines, as well as extensions for quadrupole correction, are also discussed

  2. The CERN Library

    CERN Multimedia

    Hester, Alec G

    1968-01-01

    Any advanced research centre needs a good Library. It can be regarded as a piece of equipment as vital as any machine. At the present time, the CERN Library is undergoing a number of modifications to adjust it to the changing scale of CERN's activities and to the ever increasing flood of information. This article, by A.G. Hester, former Editor of CERN COURIER who now works in the Scientific Information Service, describes the purposes, methods and future of the CERN Library.

  3. Greece at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    1997-01-01

    Greece, one of CERN*'s founding Member States, inaugurated its first Industrial Exhibition at the Meyrin site on Tuesday, 14 October. After a meeting with CERN's Director General, Professor Christopher Llewellyn Smith, Professor Emmanuel Frangoulis, the General Secretary of the Greek Ministry of Industry, accompanied by Prof Emmanuel Floratos, Greek delegate to CERN council visited the DELPHI experiment on the LEP collider, guided by Andromachi Tsirou, a Greek physicist.

  4. France at CERN

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    Rolf Heuer, CERN Director General, visits the exhibition "La France au CERN". The exhibition France at CERN, organized by UBIFRANCE in collaboration with CERN's GS/SEM (Site Engineering and Management) service, took place from Monday 7 to Wednesday 9 June in the Main Building. The 36 French firms taking part came to present their products and technologies related to the Organization's activities. The next exhibition will be "Netherlands at CERN" in November.

  5. The proton microquasar

    OpenAIRE

    Vila, Gabriela S.; Romero, Gustavo E.

    2008-01-01

    We present a model for high-energy emission in microquasars where the energy content of the jets is dominated by relativistic protons. We also include a primary leptonic component. Particles are accelerated up to relativistic energies in a compact region located near the base of the jet, where most of the emission is produced. We calculate the production spectrum due to proton and electron synchrotron radiation and photohadronic interactions. The target field for proton-photon collisions is p...

  6. CERN Photowalk 2015

    CERN Multimedia

    2015-01-01

    CERN is organising a Photowalk on Friday 25 September 2015. At this event a few selected photographers will get the chance to come to CERN, the European Organization for Nuclear Research, for an exclusive behind-the-scenes tour of the laboratory. For more information: http://photowalk2015.web.cern.ch/

  7. In the CERN Library

    CERN Multimedia

    1963-01-01

    Seen in this picture is Noria Christophoridou, librarian of the Greek Atomic Energy Commission, who has been sent by her government to CERN for a year to widen her experience of library and documentation services. In the photograph she is providing information to Kurt Gottfried, a CERN visiting scientist from Harvard University, who is spending a year with CERN's Theory Division

  8. Mapping of the thermal neutron distribution in the lead block assembly of the PS-211 experiment at CERN, using thermoluminescence and nuclear track detectors

    CERN Document Server

    Savvidis, E; Kitis, G

    2002-01-01

    The main purpose of the TARC (transmutation by adiabatic resonance crossing) experiment (PS-211), was to demonstrate the possibility to destroy efficiently long-lived fission fragments (LLFF) in accelerator driven systems (ADS). The experimental set-up which consisted of a lead block with dimensions 3.3 * 3.3 * 3 m/sup 3/, was installed in a CERN proton synchrotron (PS) beam line. The proton beam at 2.5 GeV/c and 3.5 GeV/c, was incident in the centre of the lead block assembly producing neutrons via spallation reactions. Neutron flux measurements are presented in the lead block assembly using thermoluminescence and nuclear track detectors. The results are in good agreement with Monte Carlo calculations as well as with the results of the other methods used in the framework of the TARC experiment. (5 refs).

  9. Collide@CERN Geneva

    CERN Document Server

    CERN. Geneva; Kieffer, Robert; Blas Temino, Diego; Bertolucci, Sergio; Mr. Decelière, Rudy; Mr. Hänni, Vincent

    2014-01-01

    CERN, the Republic and Canton of Geneva, and the City of Geneva are delighted to invite you to “Collide@CERN Geneva Music”. Come to the public lecture about collisions between music and particle physics by the third winners of Collide@CERN Geneva, Vincent Hänni & Rudy Decelière, and their scientific inspiration partners, Diego Blas and Robert Kieffer. The event marks the beginning of their residency at CERN, and will be held at the CERN Globe of Science and Innovation on 16 October 2014 at 19.00. Doors will open at 18.30.

  10. CERN Cricket Club

    CERN Multimedia

    CERN Cricket Club

    2010-01-01

    CERN Cricket Club Match Reports The cricket season is well under way, despite the weather, and several matches have been played. The match reporters have, however, found it too difficult to limit their reports to ¼ of a page, hence the reports have not appeared in the bulletin. All reports can be found at http://cern.ch/Club-Cricket/reports/reports.html The list of forthcoming matches can be consulted at http://cern.ch/Club-Cricket/fixtures.html Further information about the CERN Cricket Club can be found at http://cern.ch/Club-Cricket/

  11. Britain at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    1996-01-01

    On 8 October, H.E. Mr David Beattie, British Ambassador to Switzerland, Mr John R. Nichols, H.M. Consul-General in Geneva and, Prof. Christopher Llewellyn Smith, CERN*'s Director General, formally opened the industrial exhibition of thirty-three British hi-tech companies at CERN, which takes place from 8 to 11 October, 1996. The exhibition offers British companies the opportunity to display their products in fields that are of immediate importance to the scientists, engineers and technicians working at CERN, and also to scientists from non-Member States who take part in research projects at CERN.

  12. People and things. CERN Courier, May 1982, v. 22(4)

    International Nuclear Information System (INIS)

    The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. The 1982 Summer Workshop on Proton Decay Experiments will be held from 7-11 June at Argonne National Laboratory. Its purpose is to bring together experimenters and theorists with an active interest in the next generation of proton decay experiments. A workshop will be held at Los Alamos from 19-22 July to discuss the LAMPF II project for a rapid cycling 16 GeV synchrotron providing 1013 protons per pulse. 'The challenge of attaining ultra high energies' - This is the title of a meeting to review limitations and possibilities in particle acceleration to ultra high energies, organized jointly by ECFA and the Rutherford Laboratory. The topics for discussion will include the use of high electric fields generated in plasmas, external fields in short wave r.f. linacs, and laser illuminated gratings

  13. CERN honours Georges Charpak

    CERN Multimedia

    2009-01-01

    CERN pays tribute to the work of Georges Charpak at a colloquium in honour of his 85th birthday. var flash_video_player=get_video_player_path(); insert_player_for_external('Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-0753-kbps-480x360-25-fps-audio-64-kbps-44-kHz-stereo', 'mms://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-Multirate-200-to-753-kbps-480x360.wmv', 'false', 480, 360, 'https://mediastream.cern.ch/MediaArchive/Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-posterframe-480x360-at-10-percent.jpg', '1167500', true, 'Video/Public/Movies/2009/CERN-MOVIE-2009-008/CERN-MOVIE-2009-008-0600-kbps-maxH-360-25-fps-audio-128-kbps-48-kHz-stereo.mp4'); Watch the video conference of Georges Charpak.   On 9 March CERN’s Main Auditorium was the venue for a fascinating and moving celebration marking the 85th birthday of Georges Charpak, who was awarded the Nobel Prize for Physics in 1992 for his inven...

  14. Multiharmonic rf feedforward system for compensation of beam loading and periodic transient effects in magnetic-alloy cavities of a proton synchrotron

    Science.gov (United States)

    Tamura, Fumihiko; Ohmori, Chihiro; Yamamoto, Masanobu; Yoshii, Masahito; Schnase, Alexander; Nomura, Masahiro; Toda, Makoto; Shimada, Taihei; Hasegawa, Katsushi; Hara, Keigo

    2013-05-01

    Beam loading compensation is a key for acceleration of a high intensity proton beam in the main ring (MR) of the Japan Proton Accelerator Research Complex (J-PARC). Magnetic alloy loaded rf cavities with a Q value of 22 are used to achieve high accelerating voltages without a tuning bias loop. The cavity is driven by a single harmonic (h=9) rf signal while the cavity frequency response also covers the neighbor harmonics (h=8,10). Therefore the wake voltage induced by the high intensity beam consists of the three harmonics, h=8,9,10. The beam loading of neighbor harmonics is the source of periodic transient effects and a possible source of coupled bunch instabilities. In the article, we analyze the wake voltage induced by the high intensity beam. We employ the rf feedforward method to compensate the beam loading of these three harmonics (h=8,9,10). The full-digital multiharmonic feedforward system was developed for the MR. We describe the system architecture and the commissioning methodology of the feedforward patterns. The commissioning of the feedforward system has been performed by using high intensity beams with 1.0×1014 proteins per pulse. The impedance seen by the beam is successfully reduced and the longitudinal oscillations due to the beam loading are reduced. By the beam loading compensation, stable high power beam operation is achieved. We also report the reduction of the momentum loss during the debunching process for the slow extraction by the feedforward.

  15. CERN Holiday Gift Guide

    CERN Multimedia

    2013-01-01

    Do you have last-minute gifts to get? Stuck for ideas? The CERN Shop and the ATLAS and CMS secretariats have some wonderfully unique gifts and stocking-fillers for sale this year - perfect for the physics fanatics in your life. Let's take a look...   1. CERN Notebook, 10 CHF - 2. CERN Pop-up book, 30 CHF - 3. USB Stick 8GB, 25 CHF - 4. CERN Tumbler, 12 CHF 5. ATLAS 3D Viewer, 5 CHF - 6. ATLAS Puzzle, 15 CHF - 7. CMS Umbrella, 25 CHF   These gifts are all available at the CERN Shop, with the exception of the ATLAS 3D Viewer and the CMS umbrella, which are only available from the respective secretariats. Don’t forget! If you’re from CERN, you still have time to take advantage of a 10% off discount at the CERN shop. Offer ends 20 December.

  16. On the feasibility of establishing the provenance of Australian Aboriginal artefacts using synchrotron radiation X-ray diffraction and proton-induced X-ray emission

    International Nuclear Information System (INIS)

    Museums and galleries in Australia have extensive collections of Aboriginal artefacts in their custody. In particular, the National Museum of Australia and the National Gallery of Australia are custodians of works of very considerable significance, in both cultural and financial terms. Art fraud can occur, documentation relating to artefacts can be mislaid, or the artefacts can be incorrectly filed. Because of this, it has become essential to establish protocols for the objective determination of the provenance of artefacts through scientific tests. For the work reported here we are concerned with the comparison of very small quantities of materials, paint scrapings from artefacts. Scrapings from artefacts of unknown provenance are compared with those from artefacts of known provenance, and the database established using an extended set of analytical techniques by Kubik. We describe here our use of synchrotron radiation X-ray diffraction (SR-XRD) to determine the mineral phase compositions of very small amounts of pigment material (<50 μg), and the use of PIXE to give their atomic compositions to a threshold level of 1 ppm for similar masses of material

  17. On the feasibility of establishing the provenance of Australian Aboriginal artefacts using synchrotron radiation X-ray diffraction and proton-induced X-ray emission

    Energy Technology Data Exchange (ETDEWEB)

    Creagh, D.C. [Division of Health, Design and Science University of Canberra, CANBERRA ACT 2601 (Australia)], E-mail: dcreagh@bigpond.net.au; Kubik, M.E. [Research School of Chemistry, Australian National University (Australia); Sterns, M. [Department of Chemistry, Australian National University (Australia)

    2007-09-21

    Museums and galleries in Australia have extensive collections of Aboriginal artefacts in their custody. In particular, the National Museum of Australia and the National Gallery of Australia are custodians of works of very considerable significance, in both cultural and financial terms. Art fraud can occur, documentation relating to artefacts can be mislaid, or the artefacts can be incorrectly filed. Because of this, it has become essential to establish protocols for the objective determination of the provenance of artefacts through scientific tests. For the work reported here we are concerned with the comparison of very small quantities of materials, paint scrapings from artefacts. Scrapings from artefacts of unknown provenance are compared with those from artefacts of known provenance, and the database established using an extended set of analytical techniques by Kubik. We describe here our use of synchrotron radiation X-ray diffraction (SR-XRD) to determine the mineral phase compositions of very small amounts of pigment material (<50 {mu}g), and the use of PIXE to give their atomic compositions to a threshold level of 1 ppm for similar masses of material.

  18. On the feasibility of establishing the provenance of Australian Aboriginal artefacts using synchrotron radiation X-ray diffraction and proton-induced X-ray emission

    Science.gov (United States)

    Creagh, D. C.; Kubik, M. E.; Sterns, M.

    2007-09-01

    Museums and galleries in Australia have extensive collections of Aboriginal artefacts in their custody. In particular, the National Museum of Australia and the National Gallery of Australia are custodians of works of very considerable significance, in both cultural and financial terms. Art fraud can occur, documentation relating to artefacts can be mislaid, or the artefacts can be incorrectly filed. Because of this, it has become essential to establish protocols for the objective determination of the provenance of artefacts through scientific tests. For the work reported here we are concerned with the comparison of very small quantities of materials, paint scrapings from artefacts. Scrapings from artefacts of unknown provenance are compared with those from artefacts of known provenance, and the database established using an extended set of analytical techniques by Kubik. We describe here our use of synchrotron radiation X-ray diffraction (SR-XRD) to determine the mineral phase compositions of very small amounts of pigment material (<50 μg), and the use of PIXE to give their atomic compositions to a threshold level of 1 ppm for similar masses of material.

  19. CERN Table Tennis Club

    CERN Multimedia

    CERN Table Tennis Club

    2014-01-01

    CERN Table Tennis Club Announcing CERN 60th Anniversary Table Tennis Tournament to take place at CERN, from July 1 to July 15, 2014   The CERN Table Tennis Club, reborn in 2008, is encouraging people at CERN to take more regular exercise. This is why the Club, thanks to the strong support of the CERN Staff Association, installed last season a first outdoor table on the terrace of restaurant # 1, and will install another one this season on the terrace of Restaurant # 2. Table tennis provides both physical exercise and friendly social interactions. The CERN Table Tennis club is happy to use the unique opportunity of the 60th CERN anniversary to promote table tennis at CERN, as it is a game that everybody can easily play, regardless of level. Table tennis is particularly well suited for CERN, as many great physicists play table tennis, as you might already know: “Heisenberg could not even bear to lose a game of table tennis”; “Otto Frisch played a lot of table tennis;...

  20. Feasibility study for a biomedical experimental facility based on LEIR at CERN

    International Nuclear Information System (INIS)

    In light of the recent European developments in ion beam therapy, there is a strong interest from the biomedical research community to have more access to clinically relevant beams. Beamtime for pre-clinical studies is currently very limited and a new dedicated facility would allow extensive research into the radiobiological mechanisms of ion beam radiation and the development of more refined techniques of dosimetry and imaging. This basic research would support the current clinical efforts of the new treatment centres in Europe (for example HIT, CNAO and MedAustron). This paper presents first investigations on the feasibility of an experimental biomedical facility based on the CERN Low Energy Ion Ring LEIR accelerator. Such a new facility could provide beams of light ions (from protons to neon ions) in a collaborative and cost-effective way, since it would rely partly on CERN's competences and infrastructure. The main technical challenges linked to the implementation of a slow extraction scheme for LEIR and to the design of the experimental beamlines are described and first solutions presented. These include introducing new extraction septa into one of the straight sections of the synchrotron, changing the power supply configuration of the magnets, and designing a new horizontal beamline suitable for clinical beam energies, and a low-energy vertical beamline for particular radiobiological experiments. (author)

  1. CERN: ALICE in the looking-glass

    International Nuclear Information System (INIS)

    While proton-proton collisions will provide the main research thrust at CERN's planned LHC high energy collider to be built in the LEP tunnel, its 27-kilometre superconducting magnet ring will also be able to handle all the other high energy beams on the CERN menu, opening up the possibility of both heavy ion and electron-proton collisions to augment the LHC research programme. A major new character in the LHC cast - ALICE (A Large Ion Collider Experiment) - has recently published a letter of intent, announcing its intention to appear on the LHC stage. Three letters of intent for major LHC proton-proton experiments were aired last year (January, page 6), and ALICE, if approved, would cohabit with the final solution for the protonproton sector (see box). Only a single major heavy ion experiment is envisaged. The protonproton detectors have some heavy ion capability, but could only look at some very specific signals. (Detailed plans for LHC's electron proton collision option are on hold, awaiting the initial exploration of this field by the new HERA collider which came into operation last year at the DESY Laboratory in Hamburg.) Describing the ALICE detector and its research aims, spokesman Jurgen Schukraft echoes T.D.Lee's observations on the state of particle physics. It is becoming increasingly clear that resolving some of today's particle puzzles require a deeper understanding of the vacuum

  2. The AWAKE Experimental Facility at CERN

    CERN Document Server

    Gschwendtner, E; Bracco, C; Butterworth, A; Cipiccia, S; Doebert, S; Fedosseev, V; Feldbaumer, E; Hessler, C; Hofle, W; Martyanov, M; Meddahi, M; Osborne, J; Pardons, A; Petrenko, A; Vincke, H

    2014-01-01

    AWAKE, an Advanced Wakefield Experiment is launched at CERN to verify the proton driven plasma wakefield acceleration concept. Proton bunches at 400 GeV/c will be extracted from the CERN SPS and sent along a 750 m long proton line to a plasma cell, a Rubidium vapour source, where the proton beam drives wakefields reaching accelerating gradients of several gigavolts per meter. A high power laser pulse will copropagate within the proton bunch creating the plasma by ionizing the (initially) neutral gas. An electron beam will be injected into the plasma cell to probe the accelerating wakefield. The AWAKE experiment will be installed in the CNGS facility. First proton beam to the plasma cell is expected by end 2016. The installation planning and the baseline parameters of the experiment are shown. The design of the experimental area and the integration of the new beam-lines as well as the experimental equipment are presented. The needed modifications of the infrastructure in the facility and a few challenges are h...

  3. Synchrotron radiation

    International Nuclear Information System (INIS)

    This report details the activities in synchrotron radiation and related areas at Daresbury Laboratory during 1989/90. The number and scope of the scientific reports submitted by external users and in-house staff is a reflection of the large amount of scheduled beamtime and high operating efficiency achieved at the Synchrotron Radiation Source (SRS) during the past year. Over 4000 hours of user beam were available, equivalent to about 80% of the total scheduled time. Many of the reports collected here illustrate the increasing technical complexity of the experiments now being carried out at Daresbury. Provision of the appropriate technical and scientific infrastructure and support is a continuing challenge. The development of the Materials Science Laboratory together with the existing Biological Support Laboratory will extend the range of experiments which can be carried out on the SRS. This will particularly facilitate work in which the sample must be prepared or characterised immediately before or during an experiment. The year 1989/90 has also seen a substantial upgrade of several stations, especially in the area of x-ray optics. Many of the advantages of the High Brightness Lattice can only be exploited effectively with the use of focusing optics. As the performance of these stations improves, the range of experiments which are feasible on the SRS will be extended significantly. (author)

  4. Physics at the CERN p bar p collider

    International Nuclear Information System (INIS)

    This paper reports that the transformation of the 450 GeV Super Proton Synchrotron (SPS) at CERN into a proton-antiproton collider was originally proposed as a cheap way to observe experimentally the production and decay of the weak Intermediate Vector Bosons (IVBs), W± and Z, postulated by the unified electroweak theory. The first p bar p collisions at a centre-of-mass energy square root of s = 546 GeV were observed in July 1981, three years after the approval of the project. In the first physics run, which took place at the end of 1981, the production of high transverse momentum (pT) jets in hadron collisions was observed unambiguously for the first time. By the end of 1982, the machine luminosity was high enough to permit the observation of W production, followed by the decay W → ev. In a subsequent run during the spring of 1983, the decays Z → e+e- and Z → μ+μ- were observed. Following these historical discoveries, the machine energy was increased to the value of 630 GeV, and two more physics runs took place in the autumn of 1984 and of 1985. These runs have allowed the two major experiments, UA1 and UA2, to collect a large amount of data, which have greatly contributed to our understanding of quantum chromodynamics (QCD) and of the electroweak theory based on SU(2) x U(1) gauge invariance and on spontaneous symmetry breaking by means of the Higgs mechanism (the so-called Standard Model)

  5. CERN and the environment

    CERN Multimedia

    Corinne Pralavorio

    2016-01-01

    New webpages answer common questions about CERN and the environment.   One of the new public webpages dedicated to CERN and the environment. Do your neighbours ever ask you about CERN’s environmental impact? And about radiation in particular? If so, the answers to those questions can now be found online on a new set of public webpages dedicated to CERN and the environment. These pages, put together by the Occupational Health, Safety and Environmental Protection (HSE) unit and the groups responsible for CERN's site maintenance, contain a wealth of information on topics linked to the environment, such as biodiversity at CERN, waste management, ionising radiation, and water and electricity consumption. “CERN forms part of the local landscape, with its numerous sites and scientific activities. It’s understandable that people living nearby have questions about the impact of these activities and it’s important that we respond with complete transp...

  6. German visits to CERN

    CERN Multimedia

    2007-01-01

    State secretary to Germany's Federal Ministry of Education and Research, Frieder Meyer-Krahmer, with CERN's Director-General Robert Aymar.On 21 February, Professor Frieder Meyer-Krahmer, State Secretary to Germany's Federal Ministry of Education and Research, came to CERN. He visited the ALICE and ATLAS experiments and the computing centre before meeting the CERN's Director-General, some German physicists and members of the top management. The Minister of Science, Research and the Arts of the Baden-Württemberg regional government, Peter Frankenberg, and CERN's Director-General, Robert Aymar, signing an agreement on education. In the background: Sigurd Lettow, CERN's Director of Finance and Human Resources, and Karl-Heinz Meisel, Rector of the Fachhochschule Karlsruhe. The Minister of Science, Research and the Arts of the Baden-Württemberg regional government, Prof. Peter Frankenberg, visited CERN on 23 February. He was accompanied by the Rector of the Fachhochschule Karlsruhe, Prof. Karl-Heinz Meisel, and b...

  7. Germany at CERN

    CERN Multimedia

    2005-01-01

    From left to right: Maximilian Metzger, CERN's Secretary-General, Hermann Schunck, Director at the German Federal Ministry of Education and Research, and Robert Aymar, CERN's Director-General, talking to Wolfgang Holler from Butting, one of the companies at the "Germany at CERN" exhibition. Far right : Susanne-Corinna Langer-Greipl from BMBF, delegate to the CERN Finance Committee. For three days, CERN's Main Building was transformed into a showcase for German industry. Twenty-nine companies from sectors related to particle physics (electrical engineering, vacuum and low temperature technology, radiation protection, etc.) were here for the ninth "Germany at CERN" exhibition, organised by the German Federal Ministry of Education and Research (BMBF), which gave them the opportunity to meet scientists and administrators from the Laboratory. On 1 March the exhibition was visited by a German delegation headed by Dr Hermann Schunck, Director at BMBF.

  8. Young Artists@ CERN

    CERN Document Server

    2004-01-01

    In view of 50th anniversary of CERN, about 20 young artists will be visiting CERN from 26 to 31 January to learn about the laboratory's research and the mysterious world of particle physics. The impressions they take home will be the main inspiration for the artwork they will then produce for an exhibition to be inaugurated in October 2004 as part of CERN's 50th anniversary celebration. We are looking for scientists who are interested in the Art-Science synergy and who can volunteer to discuss their work at CERN to these young artists during this week (25-31/01). Please contact renilde.vanden.broeck@cern.ch if you are interested. The project is called Young Artists@ CERN and for more information look at this website: http://www.hep.ucl.ac.uk/~andy/CERNart/

  9. CERN Cricket club

    CERN Multimedia

    CERN Cricket club

    2015-01-01

    The CERN Cricket Club 2015 season begins soon, the first net practice is scheduled (weather permitting) for Thursday April 16th, at 18:00! The club is always looking for new players and newcomers will be made very welcome. Anyone who is interested in joining the club should sign up on our web site: http://cern.ch/Club-Cricket/ or turn up for net practice, which takes place each Thursday evening from April 16th (apart from CERN official holidays) until the end of September (starting at 18:00 to around 19:30) at the CERN Prévessin site: http://club-cricket.web.cern.ch/Club-Cricket/CERN-Ground.html The first match will be at home on Sunday, April 19th against Rhone CC from Lyon.

  10. CERN Relay Race

    CERN Multimedia

    CERN Running Club

    2010-01-01

    The CERN relay race will take place around the Meyrin site on Thursday 20 May, starting at 12.15. If possible, please avoid driving on the site during this 20-minute period. If you do meet runners while driving your car, please STOP until they have all passed. Thank you for your cooperation. Details on the route, and how to register your team for the relay race, can be found at: https://espace.cern.ch/Running-Club/CERN-Relay

  11. The CERN PC farm

    CERN Multimedia

    Serge Bellegarde

    2005-01-01

    Housed in the CERN Computer Centre, these banks of computers process and store data produced on the CERN systems. When the LHC starts operation in 2008, it will produce enough data every year to fill a stack of CDs 20 km tall. To handle this huge amount of data, CERN has also developed the Grid, allowing the processing power to be shared between computer centres around the world.

  12. Sharing resources@CERN

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    The library is launching a 'sharing resources@CERN' campaign, aiming to increase the library's utility by including the thousands of books bought by individual groups at CERN. This will improve sharing of information among CERN staff and users. Photo 01: L. to r. Eduardo Aldaz, from the PS division, Corrado Pettenati, Head Librarian, and Isabel Bejar, from the ST division, read their divisional copies of the same book.

  13. Radiation protection at CERN

    OpenAIRE

    Forkel-Wirth, Doris; Roesler, Stefan; Silari, Marco; Streit-Bianchi, Marilena; Theis, Christian; Vincke, Heinz; Vincke, Helmut

    2013-01-01

    This paper gives a brief overview of the general principles of radiation protection legislation; explains radiological quantities and units, including some basic facts about radioactivity and the biological effects of radiation; and gives an overview of the classification of radiological areas at CERN, radiation fields at high-energy accelerators, and the radiation monitoring system used at CERN. A short section addresses the ALARA approach used at CERN.

  14. People and things. CERN Courier, September 1980, v. 20(6)

    International Nuclear Information System (INIS)

    The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events: ; At the 66th Session of the CERN Council on 27 June the project to construct a large electron-positron storage ring, known as LEP, as Europe's next major facility for high energy physics research was formally presented for the first time; A meeting, organized jointly by DESY and the Max-Planck Institute in Munich, will be held in Munich on 24-25 October for those interested in the construction and later use of the proposed HERA electron-proton colliding ring; On 19 June papers were signed at Fermilab extending the collaboration in high energy physics between the USA and China which first took formal form early in 1979; At the end of May, a second International Symposium on the History of Particle Physics was held at Fermilab; The Government of the Canadian province of Alberta has given interim funding for the conceptual design of an accelerator complex which will consist primarily of a heavy ion synchrotron giving ions up to A = 40 and 600 MeV/amu. The project has the acronym 'MARIA' — Medical Accelerator Research Institute, Alberta; On 16, 17 June a Cryogenic Workshop was held at Fermilab to focus on helium refrigeration systems for superconducting high energy accelerators. ; A few years ago, when the 5 GeV electron synchrotron NINA at the Daresbury Laboratory was in its final years of operation, the magnets of NINA seemed to be built into every new accelerator proposal then emerging in Europe. Now, with the machine closed down, the magnets remain available and Daresbury would like to see them in action again if anyone could make good use of them

  15. CERN - better than science fiction!

    CERN Multimedia

    2007-01-01

    From left to right: Allan Cameron (Production Designer), Sam Breckham (Location Manager), James Gillies (Head of Communication at CERN), Jacques Fichet (from the CERN audiovisual service), Rolf Landua (former spokesman of the ATHENA antihydrogen experiment at CERN and Head of CERN's Education Group), Ron Howard, and Renilde Vanden Broeck (CERN press officer).

  16. Progress of the Proton-Ion Medical Machine Study (PIMMS)

    International Nuclear Information System (INIS)

    The Proton-Ion Medical Machine Study (PIMMS) was set up following an agreement between Professor M. Regler of the Med-AUSTRON (Austria) and Professor U. Amaldi of the TERA Foundation (Italy) to join their efforts in the design of a medical synchrotron that could later be adapted to individual national needs. CERN agreed to host this study inside its PS Division and to contribute one full-time member to the study team. The study group has worked in collaboration with GSI (Germany) and was more recently joined by Onkologie 2000 (Czech Republic). Work started in January 1996 and is expected to finish during 1998. The agreed aim of the study was to investigate and design a generic facility that would allow the direct clinical comparison of protons and carbon ions for cancer treatment. The accelerator was to be designed primarily for high-precision active beam scanning with both protons and ions, but was also to be capable of delivering proton beams with passive spreading. (orig.)

  17. Integrity at CERN

    CERN Document Server

    Department, HR

    2015-01-01

    In the fulfillment of its mission, CERN relies upon the trust and material support of its Member States and partners, and is committed to exercising exemplary stewardship of the resources with which it is entrusted. Accordingly, CERN expects the highest level of integrity from all its contributors (whether members of the personnel, consultants, contractors working on site, or persons engaged in any other capacity at or on behalf of CERN). Integrity is a core value of CERN, defined in the Code of Conduct as “behaving ethically, with intellectual honesty and being accountable for one’s own actions”.

  18. Britain at CERN

    CERN Multimedia

    2000-01-01

    H. E. Mr Christopher Hulse, Ambassador of United Kingdom in Switzerland, CERN Director General Luciano Maiani, Sir David Wright, Chief Executive of British Trade International and Roger Cashmore, CERN Director of research visit the Britain at CERN exhibition. From 14 to 17 November 30 British companies exhibited leading edge technologies at CERN. This is Britain's 18th exhibition at CERN since 1968. Out of the 30 companies, which attended the Britain at CERN exhibition in 1998, 25 have received an order or a contract relating to CERN during the last two years. The exhibition was inaugurated on Tuesday by Sir David Wright, Chief Executive of British Trade International. He was accompanied by H.E. Mr Christopher Hulse CMG, OBE, Her Majesty's Ambassador to Switzerland, and Mr. David Roberts, Deputy Head of Mission and Director of Trade Promotion at the British Embassy in Bern. CERN Director-General, Professor Luciano Maiani, underlined the major contribution of British physicists to CERN, pointing out the fact ...

  19. Dear CERN Computing Community,

    CERN Multimedia

    2003-01-01

    This is to remind you that LXPLUS6 cluster will be switched off on: Friday May 30th 2003 12:00 CET Please start using lxplus.cern.ch now to avoid unnecessary problems at the last minute. Note especially, that telnet and ftp to lxplus.cern.ch are not provided and will not work, instead secure protocols such as ssh and sftp should be used. Also LINUX6 resources in LXBATCH will no longer be available from the same date - Friday May 30th 2003 8:00 CET. See: http://cern.ch/plus/issues.html for other know issues. Vladimir Bahyl CERN/IT/FIO/FS

  20. Dear CERN Computing Community,

    CERN Multimedia

    2003-01-01

    This is to remind you that LXPLUS6 cluster will be switched off on: Friday May 30th 2003 12:00 CETPlease start using lxplus.cern.ch now to avoid unnecessary problems at the last minute. Note especially, that telnet and ftp to lxplus.cern.ch are not provided and will not work, instead secure protocols such as ssh and sftp should be used. Also LINUX6 resources in LXBATCH will no longer be available from the same date - Friday May 30th 2003 8:00 CET. See: http://cern.ch/plus/issues.html for other know issues. Vladimir Bahyl CERN/IT/FIO/FS

  1. Synchrotron radiation

    International Nuclear Information System (INIS)

    Synchrotron radiation (SR) from the bending magnet of a circular electron (positron) accelerator is a brilliant source in the vacuum ultraviolet, soft- and hard-x ray regions. First the characteristics of the bending SR are delete discussed. Though the brilliance of SR was improved dramatically in the last decade, neither bending, wiggler SR nor undulator SR is coherent. Coherent far infrared radiation in the mm wavelength region has recently been observed from a short electron bunch (∼ 2.5 mm long) in a bending magnet connected to a linac at Tohoku University. Coherent radiation due to higher harmonics generation by laser excitation of electron bunches in an undulator is then described. Finally a free electron laser (FEL) using optical klystron in a storage ring is reviewed. (author)

  2. The use of slow-cycling synchrotrons in injection systems

    CERN Multimedia

    1966-01-01

    The PS improvement programme is concerned with increasing the potential of the PS for high energy physics. It involves developing the performance of the proton synchrotron itself and providing major items of experimental equipment to be used on the machine.

  3. Injection System design for a hadron therapy Synchrotron

    Institute of Scientific and Technical Information of China (English)

    ZHANG Jin-Quan; SONG Ming-Tao; WEI Bao-Wen

    2008-01-01

    A synchrotron is designed for tumour therapy with C6+ ions or proton.Its injector is a cyclotron, which delivers C5+or H+2 ions to the synchrotron.After comparing the methods of the single-turn injection, the multi-turn injection and the stripping injection,this paper chooses the stripping injection method.In addition,the concept design of the injection system is presented,in which the synchrotron lattice is optimized.

  4. CERN: Superhigh electromagnetic fields; First results from new ISOLDE

    International Nuclear Information System (INIS)

    Last year, CERN's ISOLDE on-line isotope separator, with a quarter of a century of history behind it, began a new lease of life in its new home at the Proton Synchrotron Booster (July 1992, page 5). Initial physics results are already emerging. The first new ISOLDE Booster study, on nuclear beta decay, was extremely compact for a beamline experiment, occupying altogether less than one cubic metre! In the beta decay of marginally bound excited nucleons, the large spatial extent of their orbits should affect the decay rates. At ISOLDE, the beta decay of neon- 17 (10 protons) into the first excited state of fluorine-17 (9 protons) was compared to the well known mirror decay of nitrogen-17 (10 neutrons) into the same state of oxygen-17 (9 neutrons). In one of the largest beta decay asymmetries ever seen, neon was found to decay about twice as fast as nitrogen. This suggests that the produced fluorine-17 is an oxygen- 16 core with a remote 'halo' proton, and demonstrates the usefulness of beta decay for probing outlying nuclear structure. A somewhat larger installation taking data last year was a laser spectroscopy experiment to investigate a wide range of properties, from charge radius to magnetic dipole moments, of very unstable isotopes. Hyperfine structure information comes from the resonances in atomic transitions induced by a tuned laser beam collinear with the ISOLDE beam. First results covered the isotopes argon-32 to 35 and argon-45. These delicate beams required a new sensitive detection technique, based on selective ionization followed by radioactivity measurement. Users are increasingly using the almost unlimited choice of ISOLDE beams to investigate very low concentrations of impurities in materials. Due to its considerable technological and economic importance, the major topic is impurity implantation in semiconductors, where the localized impurities essential for electronic functioning can also be responsible for semiconductor deterioration

  5. LHC Injectors Upgrade (LIU) Project at CERN

    CERN Document Server

    Shaposhnikova, Elena; Damerau, Heiko; Funken, Anne; Gilardoni, Simone; Goddard, Brennan; Hanke, Klaus; Kobzeva, Lelyzaveta; Lombardi, Alessandra; Manglunki, Django; Mataguez, Simon; Meddahi, Malika; Mikulec, Bettina; Rumolo, Giovanni; Scrivens, Richard; Vretenar, Maurizio

    2016-01-01

    A massive improvement program of the LHC injector chain is presently being conducted under the LIU project. For the proton chain, this includes the replacement of Linac2 with Linac4 as well as all necessary upgrades to the Proton Synchrotron Booster (PSB), the Proton Synchrotron (PS) and Super Proton Synchrotron (SPS), aimed at producing beams with the challenging High Luminosity LHC (HL-LHC) parameters. Regarding the heavy ions, plans to improve the performance of Linac3 and the Low Energy Ion Ring (LEIR) are also pursued under the general LIU program. The full LHC injection chain returned to operation after Long Shutdown 1, with extended beam studies taking place in Run 2. A general project Cost and Schedule Review also took place in March 2015, and several dedicated LIU project reviews were held to address issues awaiting pending decisions. In view of these developments, 2014 and 2015 have been key years to define a number of important aspects of the final LIU path. This paper will describe the reviewed LI...

  6. Inside CERN : Devoiler l'inaccessible

    CERN Multimedia

    Denis Postle; Edwin Shaw

    1974-01-01

    Presentation of what goes on at CERN. Animation of protons going around a ring, then sent to a target and detectors look at them. SC. PS. ISR. Interesting animation: a red light is superimposed on the accelerator to indicate the beam path. (PS and ISR) BEBC. Scanning, with a nice moment of the tracks arriving. Omega. Tracks. Map showing where SPS will be. The Robbins. Other aspects of SPS construction: magnets, RF cavaties, vacuum tube.

  7. Results from the CERN pilot CLOUD experiment

    Directory of Open Access Journals (Sweden)

    J. Duplissy

    2010-02-01

    Full Text Available During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving OUtdoor Droplets (CLOUD experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm detection threshold of between 0.1 and 100 cm−3s−1, and growth rates between 2 and 37 nm h−1. The corresponding H2O concentrations were typically around 106 cm−3 or less. The experimentally-measured formation rates and htwosofour concentrations are comparable to those found in the atmosphere, supporting the idea that sulphuric acid is involved in the nucleation of atmospheric aerosols. However, sulphuric acid alone is not able to explain the observed rapid growth rates, which suggests the presence of additional trace vapours in the aerosol chamber, whose identity is unknown. By analysing the charged fraction, a few of the aerosol bursts appear to have a contribution from ion-induced nucleation and ion-ion recombination to form neutral clusters. Some indications were also found for the accelerator beam timing and intensity to influence the aerosol particle formation rate at the highest experimental SO2 concentrations of 6 ppb, although none was found at lower concentrations. Overall, the exploratory measurements provide suggestive evidence for ion-induced nucleation or ion-ion recombination as sources of aerosol particles. However in order to quantify the conditions under which ion processes become significant, improvements are needed in

  8. Results from the CERN pilot CLOUD experiment

    Directory of Open Access Journals (Sweden)

    J. Duplissy

    2009-09-01

    Full Text Available During a 4-week run in October–November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the CLOUD1 experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm detection threshold of between 0.1 and 100 cm−3s−1, and growth rates between 2 and 37 nm h−1. The corresponding H2SO4 concentrations were typically around 106 cm−3 or less. The experimentally-measured formation rates and H2SO4 concentrations are comparable to those found in the atmosphere, supporting the idea that sulphuric acid is involved in the nucleation of atmospheric aerosols. However, sulphuric acid alone is not able to explain the observed rapid growth rates, which suggests the presence of additional trace vapours in the aerosol chamber, whose identity is unknown. By analysing the charged fraction, a few of the aerosol bursts appear to have a contribution from ion-induced nucleation and ion-ion recombination to form neutral clusters. Some indications were also found for the accelerator beam timing and intensity to influence the aerosol particle formation rate at the highest experimental SO2 concentrations of 6 ppb, although none was found at lower concentrations. Overall, the exploratory measurements provide suggestive evidence for ion-induced nucleation or ion-ion recombination as sources of aerosol particles. However in order to quantify the conditions under which ion processes become significant, improvements are needed in

  9. Results from the CERN pilot CLOUD experiment

    International Nuclear Information System (INIS)

    During a 4-week run in October-November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving Outdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm detection threshold of between 0.1 and 100 cm-3 s-1, and growth rates between 2 and 37 nm h-1. The corresponding H2SO4 concentrations were typically around 106 cm-3 or less. The experimentally-measured formation rates and H2SO4 concentrations are comparable to those found in the atmosphere, supporting the idea that sulphuric acid is involved in the nucleation of atmospheric aerosols. However, sulphuric acid alone is not able to explain the observed rapid growth rates, which suggests the presence of additional trace vapours in the aerosol chamber, whose identity is unknown. By analyzing the charged fraction, a few of the aerosol bursts appear to have a contribution from ion-induced nucleation and ion-ion recombination to form neutral clusters. Some indications were also found for the accelerator beam timing and intensity to influence the aerosol particle formation rate at the highest experimental SO2 concentrations of 6 ppb, although none was found at lower concentrations. Overall, the exploratory measurements provide suggestive evidence for ion-induced nucleation or ion-ion recombination as sources of aerosol particles. However in order to quantify the conditions under which ion processes become significant, improvements are needed in controlling the experimental variables and in the reproducibility of the experiments. Finally, concerning technical aspects, the most

  10. Results from the CERN pilot CLOUD experiment

    Energy Technology Data Exchange (ETDEWEB)

    Duplissy, J.; David, A.; Hahn, F.; Kirkby, J.; Onnela, A.; Veenhof, R.; Wilhelmsson, M. [CERN, PH Dept., Geneva (Switzerland); Enghoff, M.B.; Avngaard, M.; Bondo, T.; Marsh, N.D.; Pedersen, O.P.; Polny, J.; Svensmark, H.; Svensmark, J. [DTU Space, National Space Inst., Center for Sun-Climate Research, Copenhagen (Denmark); Aplin, K.L.; Bingham, R.; Kellett, B.; Lockwood, M. [Rutherford Appleton Lab., Space Science and Technology Dept., Chilton (United Kingdom); Arnold, F.; Aufmhoff, H.; Reichl, U. [Max-Planck Inst. for Nuclear Physics, Heidelberg (Germany); Verheggen, B. [Dept. of Air Quality and Climate Change, Energy Research Centre of the Netherlands ECN, Petten (Netherlands); Baltensperger, U.; Wehrle, G.; Weingartner, E. [Paul Scherrer Inst., Lab. of Atmospheric Chemistry, Villigen (Switzerland); Carslaw, K. [Univ. of Leeds, School of Earth and Environment, Leeds (United Kingdom); Curtius, J. [Goethe-Univ. of Frankfurt, Inst. for Atmospheric and Environmental Sciences, Frankfurt am Main (Germany); Fastrup, B.; Pedersen, E. [Univ. of Aarhus, Inst. of Physics and Astronomy, Aarhus (Denmark); Gagne, S.; Kulmala, M.; Laakso, L.; Nieminen, T.; Sipila, M. [Helsinki Inst. of Physics and Univ. of Helsinki, Dept. of Physics, Helsinki (Finland); Harrison, R.G. [Univ. of Reading, Dept. of Meteorology, Reading (United Kingdom); Laaksonen, A. [Univ. of Kuopio, Dept. of Physics, Kuopio (Finland); Lillestol, E. [Univ. of Bergen, Inst. of Physics, Bergen (Norway); Makela, J. [Tampere Univ. of Technology (Finland); Makhmutov, V.; Stozhkov, Y. [Lebedev Physical Inst., Solar and Cosmic Ray Research Lab., Moscow (Russian Federation); Seinfeld, J.H. [California Inst. of Tech., Div. of Chemistry and Chemical Engineering, Pasadena, CA (United States); Stratmann, F.; Wex, H. [Leibniz Inst. for Tropospheric Research, Leipzig (Germany); Viisanen, Y. [Finnish Meteorological Inst., Helsinki (Finland); Wagner, P.E.; Winkler, P.M. [Univ. of Vienna (Austria)

    2010-02-15

    During a 4-week run in October-November 2006, a pilot experiment was performed at the CERN Proton Synchrotron in preparation for the Cosmics Leaving Outdoor Droplets (CLOUD) experiment, whose aim is to study the possible influence of cosmic rays on clouds. The purpose of the pilot experiment was firstly to carry out exploratory measurements of the effect of ionising particle radiation on aerosol formation from trace H2SO4 vapour and secondly to provide technical input for the CLOUD design. A total of 44 nucleation bursts were produced and recorded, with formation rates of particles above the 3 nm detection threshold of between 0.1 and 100 cm{sup -3} s{sup -1}, and growth rates between 2 and 37 nm h{sup -1}. The corresponding H2SO4 concentrations were typically around 106 cm{sup -3} or less. The experimentally-measured formation rates and H2SO4 concentrations are comparable to those found in the atmosphere, supporting the idea that sulphuric acid is involved in the nucleation of atmospheric aerosols. However, sulphuric acid alone is not able to explain the observed rapid growth rates, which suggests the presence of additional trace vapours in the aerosol chamber, whose identity is unknown. By analyzing the charged fraction, a few of the aerosol bursts appear to have a contribution from ion-induced nucleation and ion-ion recombination to form neutral clusters. Some indications were also found for the accelerator beam timing and intensity to influence the aerosol particle formation rate at the highest experimental SO2 concentrations of 6 ppb, although none was found at lower concentrations. Overall, the exploratory measurements provide suggestive evidence for ion-induced nucleation or ion-ion recombination as sources of aerosol particles. However in order to quantify the conditions under which ion processes become significant, improvements are needed in controlling the experimental variables and in the reproducibility of the experiments. Finally, concerning technical

  11. CERN technology in the service of medicine

    CERN Multimedia

    2001-01-01

    The prototype of the first module of the LInac BOster (LIBO) has been constructed and tested at CERN. This new medical accelerator offers new perspectives in deep-seated tumour treatment.   Accelerator technology developed at CERN is set to bring about important advances in cancer therapy. The linac booster - LIBO - project aims to build a 3GHz proton linear accelerator to boost to 200 MeV the energy of the beam from 50-70 MeV cyclotrons, existing in several hospitals and laboratories. This will allow deep-seated tumours to be treated (see box). The prototype of the first LIBO module has just passed high power RF tests at CERN. Two members of the LIBO collaboration, Riccardo Zennaro and Paolo Berra, with the first LIBO module installed in the LIL tunnel. The LIBO idea goes back to 1993 when it was conceived by CERN's Ugo Amaldi, founder of Italy's TERA foundation. From the beginning, Mario Weiss, a former CERN staff member has led the project. A decisive step was taken in 1998 when a collaboration...

  12. Supervision application for the new power supply of the CERN PS (POPS)

    International Nuclear Information System (INIS)

    The power supply system for the magnets of the CERN PS (Proton Synchrotron) has been recently upgraded to a new system called POPS (Power for PS). The old mechanical machine has been replaced by a system based on capacitors. The equipment as well as the low level controls have been provided by an external company (CONVERTEAM). The supervision application has been developed at CERN reusing the technologies and tools used for the LHC Accelerator and Experiments (UNICOS and JCOP frameworks, SIMATIC WinCC Open Architecture SCADA tool). The POPS control system architecture is a 3 layer control system. The first layer is the field layer with remote input/output module connected to the control layer. This layer is composed of WAGO modules interfaced with the control layer via the PROFIBUS field-bus. The second layer is the control layer with CONVERTEAM hardware and software based on VME cards, holding the closed control loops and the voltage and capacitors control. The CONVERTEAM control system is distributed over four CPUs and remote IO modules. Each CPU is monitoring the link with the Supervision layer; the interruption of the communication stops the powering of the system. The third layer is the supervision layer. In this layer, process views are provided for the monitoring and the control/command interface of the control system. Other typical functions (e.g. archiving, trending, alarm handling) are also provided by this layer. The paper describes the full architecture of the control application, and the challenges faced for the integration with an out-sourced system. The benefits of reusing the CERN industrial control frameworks and the required adaptations will be discussed. Finally, the initial operational experience will be presented

  13. Romanian Visit to CERN

    CERN Multimedia

    2001-01-01

    Romanian Minister for Foreign Affairs, Mr Mircea Dan Geoana, visited CERN on 30 March to discuss collaboration between his country and the Laboratory. Above, Mr Dan Geoana signs the visitors' book in the presence of CERN Director General Luciano Maiani and Mrs Anda Flip, Ambassador and permanent representative of Romania at the United Nations.

  14. CERN's Early History Revisited

    CERN Multimedia

    Schopper, Herwig Franz; Krige, Gerhard John

    2005-01-01

    As a member of the group of historians charged to write the history of the founding of CERN, John Krige particularly underlines the important role I.I. Rabi played. The first author, former Director General of CERN add a few comments. S.A. Khan gives precisions about the role played by E. Amaldi and P. Auger; then J. Krige replies

  15. ESO: The CERN Years

    CERN Multimedia

    Schaeffer, A

    2012-01-01

    In 1970, CERN and ESO signed a collaboration agreement for the construction of the Observatory’s first telescope. That same year, ESO’s Telescope Division and Sky Atlas laboratory settled on the CERN site in Meyrin. Let’s turn back to the beginnings of this lasting and fruitful alliance.

  16. Punctualizaciones del CERN

    CERN Multimedia

    2002-01-01

    "Viene de la pagina anterior. Puntualizaciones del CERN. La valoracion que me merece la aprobacion en el Consejo de Ministros el 24 de mayo de un acuerdo de colaboracion entre el MCYT y el CERN para el proyecto de neutrinos al Gran Sasso es positiva" (1 page).

  17. Integration of CERN staff

    CERN Multimedia

    1965-01-01

    An example of the integration of CERN staff in the neighbouring communes is provided by the hamlet of Bugnon at St-Genis-Pouilly (Ain), FRance. The CERN installation on the Swiss site are visible on the left in the background. Behind them the Saleve mountain in Haute-Savoie.

  18. Child Care at CERN

    CERN Document Server

    CERN, Child Care Initiative

    2008-01-01

    This is a document summarizing a survey of child care needs of CERN staff and users which was performed in February 2008 by the CERN Child Care Initiative. The document presents the analysis of this data. Conclusions on the minimal facilities size are derived and possible funding source at the European Union are discussed.

  19. The CERN Accelerator School

    CERN Multimedia

    2016-01-01

    Introduction to accelerator physics This course will take place in Budapest, Hungary, from 2 to 14 October 2016. It is now open for registration and further information can be found at: http://cas.web.cern.ch/cas/Hungary2016/Hungary-advert.html and http://indico.cern.ch/event/532397/.

  20. CERN and the LHC

    CERN Multimedia

    Cramer, J G

    1992-01-01

    CERN, a high-energy physics laboratory in Europe, is planning to build a more powerful particle accelerator, the Large Hadronic Collider. The US spreads its accelerators around the country while most of Europe's research is conducted at and around CERN.

  1. CERN openlab Open Day

    CERN Multimedia

    Purcell, Andrew Robert

    2015-01-01

    The CERN openlab Open Day took place on 10 June, 2015. This was the first in a series of annual events at which research and industrial teams from CERN openlab can present their projects, share achievements, and collect feedback from their user communities.

  2. UK Mission to CERN

    CERN Multimedia

    2004-01-01

    At the end of June, nine experts from UK industry visited CERN to study techniques for developing distributed computing systems and to look at some specific applications. In a packed three-day programme, almost 40 CERN experts presented a comprehensive survey of achievements.

  3. France at CERN

    CERN Multimedia

    2001-01-01

    From 19 to 22 June, for the 8th edition of France at CERN, 31 French companies presented their latest technology to the Laboratory. Demonstrating the latest in French technology during France at CERN. The France at CERN exhibition was inaugurated by Mr. Bernard Frois, Director of the Department Energy, Transport, Environment and Natural Resources at the Technology Directorate of the Ministry of Research. 'France is happy to be a Member of CERN, which is a successful example of the construction of scientific Europe,' he declared during the inauguration, 'this exhibition is an excellent opportunity to put fundamental research and advanced technology in contact.' Mr. Philippe Petit, French Ambassador to Switzerland, and Mr. Alexandre Defay, technical adviser of the Minister of Research, were also present to represent France and its industry. Representing CERN at the 19 June opening of the exhibition was Claude Detraz, who said, 'I hope that this exhibition will make it possible to weave stronger links between ...

  4. CERN in the park

    CERN Multimedia

    2002-01-01

    CERN will be the centre of debate at a 'Café scientifique' on Monday 29 April. The aim of the Cafés scientifiques, which are organised by the association of Bancs Publics, is to kindle discussion between ordinary people and specialists in a scientific field. This Monday, Maurice Bourquin, President of the CERN Council, Hans Hoffmann, Director of Technology Transfer and Scientific Computing at CERN, Gilbert Guignard, a physicist at CERN, and Ruhal Floris, who teaches mathematical didactics at the University of Geneva, will explain the usefulness and contributions to science of the world's biggest laboratory for particle physics. What is CERN for? Monday 29 April at 18.30 Musée d'histoire des sciences, Geneva (in the park Perle du Lac) Entry free Wine and buffet after the discussion

  5. Romanian President Visits CERN

    CERN Multimedia

    2001-01-01

    Director General Luciano Maiani watches as Romanian President Ion Iliescu signs the CERN guest book. On Friday the 12th of October, Romanian President Ion Iliescu arrived at CERN and was warmly greeted by Director General Luciano Maiani at the steps of building 500. After initial greetings and a general presentation of the laboratory, President Iliescu and his entourage embarked on a whistle stop tour of the CERN facilities. They visited the CMS magnet assembly hall and civil engineering work where presentations were made by CMS spokesperson Michel Della Negra and the ATLAS Tile Calorimeter where the president was introduced to Romanian physicists working here at CERN. Michel Della Negra explains some of the general principles behind CMS to President Iliescu during his visit last week. The Romanian teams working on CERN projects make very visible contributions, for example to the construction of the ATLAS experiment and to the preparation of its eventual scientific exploitation. 'Those of us on the ATLAS ...

  6. CERN Mobility Survey

    CERN Multimedia

    GS Department

    2011-01-01

    The Institute of Shipping and Transport of the University of the Aegean and the National Technical University of Athens are partners with CERN in a study of mobility patterns between and within the CERN sites and to that effect have realized a mobility survey dedicated to the CERN community.         The study aims to understand: How you presently get around the CERN sites; What problems you encounter regarding mobility; What your needs are; What improvements you’d like to see; What measures you would like to see implemented most. The replies we receive will enable us to define a general policy promoting the diversity of mobility at CERN and to establish and quantify the strategic actions to be implemented for both the short and medium term. The objectives of the transport mobility plans are to: Facilitate mobility within and between the CERN sites by identifying adequate solutions in response to individual ...

  7. Lectures for CERN pensioners

    CERN Multimedia

    GS Department

    2009-01-01

    The CERN Medical Service and the Pensioners Association are pleased to invite CERN pensioners to a series of lectures given by professors and specialists from the Teaching Hospitals and the Faculty of Medicine of the University of Geneva on the following topic: PROMOTION OF OPTIMUM BRAIN AGEING The lectures will take place in the Main CERN Auditorium (Building 60) from 2.30 p.m. to 4.30 p.m. on the following dates: Thursday 15 January 2009: Diagnosing and treating Alzheimer’s disease Pr Gabriel GOLD Wednesday 25 February 2009: What is the brain reserve? Speaker’s name to be announced at a later date. The lectures will be given in French, with transparencies in English, and will be followed by a wide-ranging debate with the participants. CERN Medical Service - Pensioners Association - CERN-ESO (GAC-EPA)

  8. Synchrotron radiation

    International Nuclear Information System (INIS)

    Work at the Daresbury SRS has of necessity been interrupted this year (1991/92) due to the incorporation of Wiggler II. However, considerable beamtime was awarded before the shutdown and the major part of this appendix is concerned with the progress reports of the research undertaken then. The reports have been organised under the following broad headings: Molecular Science (19 papers), Surface and Materials Science (169 papers), Biological Science (85 papers), Instrumental and Technique Developments (13 papers) and Accelerator Physics (3 papers). It is hoped that in time the number of contributions on accelerator physics will grow to reflect the in-house activity on, for example, accelerator improvement and design. The research reports are preceded by the Annual Report of the Synchrotron Radiation Facilities Committee, which outlines the research highlights identified by that Committee (also included are details of the current membership of the SRFC and the chairmen of the Beamtime Allocation Panels). Following the reports are the specifications for the beamlines and stations. This year Section 3 contains 289 reports (nearly 100 more than last year) and the number of publications, generated by scientists and engineers who have used or are associated with Daresbury Laboratory facilities, has topped 500 for the first time. (author)

  9. Commissioning of the New Spallation Target for the nTOF facility at CERN

    International Nuclear Information System (INIS)

    The neutron Time of Flight (nTOF) facility at CERN is a source of high flux of neutrons obtained by the spallation process of 20 GeV/c protons onto a solid lead target and the remarkable beam density of the Protons Synchrotron (PS). From Nov 2008 the nTOF facility resumed operation after a halt of 4 years due to radio-protection issues. It features a new lead spallation target with a more robust design, more efficient cooling, separate moderator circuit and most important without any loss of the unique neutron performances of the previous target. The outstanding characteristics of this facility: high neutron flux 106n/cm/s.c. at 185 m, wide spectral function from thermal up to GeV, low repetition rates 1.2 s-1 1 and the excellent energy resolution of 2 x 104 open new possibilities for high precision cross section measurements, using radioactive samples of modest mass. Moreover the separate moderator circuit will permit in the future the use of borated or heavy water instead of normal water to reduce the 2.2 MeV γ background for the neutron capture measurements. The facility has been commissioned in Nov. 2008, with performances similar of the previous target and predicted by Monte Carlo simulations. (author)

  10. CERN: Digitally open, too

    CERN Multimedia

    Computer Security Team

    2013-01-01

    The Open Days are here!! From tomorrow onwards, we will be welcoming thousands of people to CERN. No barriers, no boundaries!   For decades, we have welcomed researchers and visitors from around the world to work at CERN, discuss physics research and attend our training sessions, lectures and conferences. This is how fundamental research should be conducted!!! But have you ever noticed how you are welcome at CERN in the digital world, too? Once you are affiliated and are registered with CERN, you receive a CERN computing account and e-mail address.  You can register your laptops, PCs and smartphones to use our (wireless) network, you can easily create your personal webpage, and profit from a vast disk space for file storage (AFS and DFS). CERN is indeed an Open Campus and not only during the Open Days. CERN is an Open Campus in the digital world. This digital Open Campus culture is exactly the reason why “computer security” has been dele...

  11. CERN in 2030

    CERN Multimedia

    Laëtitia Pedroso

    2011-01-01

    A competition will soon be launched to select the architect, urban planner or landscape designer to undertake the first phase of redevelopment of the parking area by the flagpoles, between Entrances A and B. This will be the first stage in a wider development project aimed at sprucing up the CERN site and enhancing its image. Work to create a pleasant and harmonious area at the CERN entrance will start in 2013 while preparatory work for other developments inside the CERN site has already begun…   CERN as it is today.  By 2030, CERN will be a greener place, much like a university campus. The arrival of the tramway on 30 April will be an opportunity to forge ahead with the urban plan aimed at rejuvenating the CERN site and redefining how it is organised. "Nearly sixty years after CERN's first buildings went up, this plan will help transform the site and give it a welcoming, friendly face, a bit like a university campus," explains Thierry Chanard, urban plannin...

  12. The 1956 CERN Symposium

    CERN Document Server

    Jarlskog, Cecilia

    2014-01-01

    CERN, currently the largest organization in the world for particle physics, was founded in 1954. Originally located in Meyrin, at the outskirts of the city of Geneva in Switzerland, it has with time extended into neighboring France. The Theoretical Study Division of CERN, however, was created already in 1952, i.e., before the official inauguration of CERN. It was situated in Copenhagen. Christian Møller [1] was appointed (part-time) as the Director and there were two full time senior staff members, Gunnar Källén and Ben R. Mottelson. While constructing buildings and accelerators were in progress, an international conference was organized by CERN in the city of Geneva. This “CERN Symposium on High Energy Accelerators and Pion Physics”, 11–23 June 1956, attracted about 250 participants from outside CERN, among them at least 18 Nobel Laureates or future Laureates. Unfortunately, the participants from CERN are not listed in the Proceedings [2]. The conference focused on measuring devices such as bubbl...

  13. CERN honours its guides

    CERN Multimedia

    2004-01-01

    At the end of January, CERN's guides were rewarded for their devotion to the Laboratory. They have a passion for their work, know CERN inside-out and for 40 years have shown people of all ages and nationalities, from all walks of life, around the Laboratory. Who are they? Why, the CERN guides, of course. On 27 January, ten of CERN's 180 guides received special honours for their impressive number of guided tours in 2003. Presenting the awards in the Microcosm hall, CERN's Director-General Robert Aymar congratulated the winners on the key role they play with respect to the general public. "CERN would be nothing without you who show them its activities," he stressed. CERN's Director-General Robert Aymar congratulates Alberto Ribon for his tally of over 40 visits in the course of 2003.One of the prizes was the book «The Particle Odyssey». Here the book's co-author Christine Sutton dedicates it for Sijin Qian. Tzanko Spassoff (PH) and retired staff members Klaus Batzner and Antonio Francano wo...

  14. Radiation protection studies for a high-power 160 MeV proton linac

    CERN Document Server

    Mauro, Egidio

    2009-01-01

    CERN is presently designing a new chain of accelerators to replace the present Proton Synchrotron (PS) complex: a 160 MeV room-temperature H− linac (Linac4) to replace the present 50 MeV proton linac injector, a 3.5 GeV Superconducting Proton Linac (SPL) to replace the 1.4 GeV PS Booster (PSB) and a 50 GeV synchrotron (named PS2) to replace the 26 GeV PS. Linac4 has been funded and the civil engineering work started in October 2008, whilst the SPL is in an advanced stage of design. Beyond injecting into the future 50 GeV PS, the ultimate goal of the SPL is to generate a 4 MW beam for the production of intense neutrino beams. The radiation protection design is driven by the latter requirement. This work summarizes the radiation protection studies conducted for Linac4. FLUKA Monte Carlo simulations, complemented by analytical estimates, were performed to evaluate the propagation of neutrons through the waveguide, ventilation and cable ducts placed along the accelerator, to estimate the radiological impact of ...

  15. Conceptual Design of the Low-Power and High-Power SPL A Superconducting H$^-$ Linac at CERN

    CERN Document Server

    Atieh, S; Aviles Santillana, I; Bartmann, W; Borburgh, J; Brunner, O; Calatroni, S; Capatina, O; Chambrillon, J; Ciapala, E; Eshraqi, M; Ferreira, L; Garoby, R; Goddard, B; Hessler, C; Hofle, W; Horvath-Mikulas, S; Junginger, T; Kozlova, E; Lebbos, E; Lettry, J; Liao, K; Lombardi, A M; Macpherson, A; Montesinos, E; Nisbet, D; Otto, T; Paoluzzi, M; Papke, K; Parma, V; Pillon, F; Posocco, P; Ramberger, S; Rossi, C; Schirm, K; Schuh, M; Scrivens, R; Torres Sanchez, R; Valuch, D; Valverde Alonso, N; Wegner, R; Weingarten, W; Weisz, S

    2014-01-01

    The potential for a superconducting proton linac (SPL) at CERN started to be seriously considered at the end of the 1990s. In the first conceptual design report (CDR), published in 2000 [1], most of the 352 MHz RF equipment from LEP was re-used in an 800 m long linac, and the proton beam energy was limited to 2.2 GeV. During the following years, the design was revisited and optimized to better match the needs of a high-power proton driver for neutrino physics. The result was a more compact (470 m long) accelerator capable of delivering 5 MW of beam power at 3.5 GeV, using state-of-the-art superconducting RF cavities at 704 MHz. It was described in a second CDR, published in 2006 [2]. Soon afterwards, when preparation for increasing the luminosity of the LHC by an order of magnitude beyond nominal became an important concern, a low-power SPL (LP-SPL) was studied as a key component in the renovation of the LHC injector complex. The combination of a 4 GeV LP-SPL injecting into a new 50 GeV synchrotron (PS2) was ...

  16. La Hollande au CERN

    CERN Document Server

    CERN Press Office. Geneva

    1995-01-01

    On 17 October the third industrial exhibition, "Holland at CERN" was officially opened by Dr R.J. van Duinen, President of the Dutch Organisation for Scientific Research (NWO). In his opening speech he encouraged scientific organisations such as CERN to take full advantage of industry's ability to design and invent new processes and equipment stressing that the purpose of the "Holland at CERN" exhibition was not simply to sell equipment, but to establish an efficient cross-fertilisation between fundamental science and industry.

  17. CERN Control Centre Animations

    CERN Multimedia

    2014-01-01

    The journey of the LHC protons begin in a hydrogen bottle. Hydrogen is the simplest element: its atom has a single proton with one electron orbiting around it. The pressure in the bottle forces the hydrogen atoms out, where they are captured in a device, the proton source. Inside, a powerful electrical discharge strips the electrons away from the protons. Under the force of an electric field, the protons whizz off into a cavity where they are accelerated and concentrated.

  18. People and things. CERN Courier, May 1985, v. 25(4)

    International Nuclear Information System (INIS)

    The article reports on achievements of various people, staff changes and position opportunities within the CERN organization and contains news updates on upcoming or past events. A workshop is being arranged to discuss the potential of the CERN SPS proton-antiproton Collider for the early 90s in view of the then simultaneous operation of the Tevatron at Fermilab, LEP at CERN and HERA at DESY, and to evaluate the need for a new Collider detector

  19. Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

    Energy Technology Data Exchange (ETDEWEB)

    Bandiera, L.; Mazzolari, A.; Bagli, E.; Germogli, G.; Guidi, V. [Universita di Ferrara, Dipartimento di Fisica, Ferrara (Italy); INFN, Ferrara (Italy); Sytov, A. [Universita di Ferrara, Dipartimento di Fisica, Ferrara (Italy); Belarusian State University, Research Institute for Nuclear Problems, Minsk (Belarus); INFN, Ferrara (Italy); Kirillin, I.V. [National Science Center ' ' Kharkov Institute of Physics and Technology' ' , Akhiezer Institute for Theoretical Physics, Kharkov (Ukraine); Shul' ga, N.F. [National Science Center ' ' Kharkov Institute of Physics and Technology' ' , Akhiezer Institute for Theoretical Physics, Kharkov (Ukraine); V.N. Karazin Kharkov National University, Kharkov (Ukraine); Berra, A.; Lietti, D.; Prest, M. [Universita dell' Insubria, Como (Italy); INFN Sezione di Milano Bicocca, Milan (Italy); De Salvador, D. [INFN Laboratori Nazionali di Legnaro, Legnaro (Italy); Universita di Padova, Dipartimento di Fisica, Padua (Italy); Vallazza, E. [INFN Sezione di Trieste, Trieste (Italy)

    2016-02-15

    An investigation on the mechanism of relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal was carried out at the extracted line H8 from CERN Super Proton Synchrotron. The experimental results were critically compared to computer simulations, showing a good agreement. We identified a necessary condition for the exploitation of axial confinement or its relaxation for particle beam manipulation in high-energy accelerators. We introduce the idea of using a short bent crystal, aligned with one of its main axis to the beam direction, as a beam steerer or a beam splitter with adjustable intensity in the field of particle accelerators. In particular, in the latter case, a complete relaxation from axial confinement to planar channeling takes place, resulting in beam splitting into the two strongest skew planar channels. (orig.)

  20. Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

    CERN Document Server

    Bandiera, L; Bagli, E; Germogli, G; Guidi, V; Sytov, A; Kirillin, I V; Shul'ga, N F; Berra, A; Lietti, D; Prest, M; De Salvador, D; Vallazza, E

    2016-01-01

    An investigation on the mechanism of relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal was carried out at the extracted line H8 from CERN Super Proton Synchrotron. The experimental results were critically compared to computer simulations, showing a good agreement. We firmly individuated a necessary condition for the exploitation of axial confinement or its relaxation for particle beam manipulation in high-energy accelerators. We demonstrated that with a short bent crystal, aligned with one of its main axis to the beam direction, it is possible to realize either a total beam steerer or a beam splitter with adjustable intensity. In particular, in the latter case, a complete relaxation from axial confinement to planar channeling takes place, resulting in beam splitting into the two strongest skew planar channels.

  1. Relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal

    Science.gov (United States)

    Bandiera, L.; Mazzolari, A.; Bagli, E.; Germogli, G.; Guidi, V.; Sytov, A.; Kirillin, I. V.; Shul'ga, N. F.; Berra, A.; Lietti, D.; Prest, M.; De Salvador, D.; Vallazza, E.

    2016-02-01

    An investigation on the mechanism of relaxation of axially confined 400 GeV/c protons to planar channeling in a bent crystal was carried out at the extracted line H8 from CERN Super Proton Synchrotron. The experimental results were critically compared to computer simulations, showing a good agreement. We identified a necessary condition for the exploitation of axial confinement or its relaxation for particle beam manipulation in high-energy accelerators. We introduce the idea of using a short bent crystal, aligned with one of its main axis to the beam direction, as a beam steerer or a beam splitter with adjustable intensity in the field of particle accelerators. In particular, in the latter case, a complete relaxation from axial confinement to planar channeling takes place, resulting in beam splitting into the two strongest skew planar channels.

  2. Star spotting at CERN

    CERN Multimedia

    2008-01-01

    This June, two American celebrities (and physics enthusiasts!) came to CERN. Brian Cox gave Mike Einziger (right), lead guitarist with the rock band Incubus, the star treatment in the ATLAS cavern. Jesse Dylan embraces the spirit of ATLAS! Mike Einziger, lead guitarist with the rock band Incubus, visited CERN on Friday 13 June between concerts in Finland and England. Einziger, a lifelong science enthusiast descended into the ATLAS and CMS caverns and visited the SM18 test magnet facility during his brief tour of CERN. Einziger learned about the LHC through watching online lectures from University of Manchester and ATLAS physicist Brian Cox, and was thrilled to have the chance to see the detectors in person. The musician has created an orchestral piece, inspired in part by the work being done at CERN for the LHC, which will have its debut in Los Angeles on 23 August. Just over a week earlier, Jesse Dylan, Hollywood film director a...

  3. Ex / Noise / CERN / Deerhoof

    CERN Multimedia

    CERN, SM18,

    2015-01-01

    Indie rockers Deerhoof battled with the noise of CERN’s magnet test facilities on 30 August 2015. The band visited CERN at the invitation of ATLAS physicist James Beacham, whose pilot project Ex/Noise/CERN collides experimental music artists with experimental particle physics. Credits: -Producer- CERN Video Productions James Beacham François Briard -Director- Noemi Caraban -Camera- Yann Krajewski Piotr Traczyk Noemi Caraban -Crane operator- Antonio Henrique Jorge-Costa -Live recording at CERN- Mixing at Rec studio/Geneva By Serge Morattel -Infography- Daniel Dominguez Noemi Caraban -Deerhoof- John Dieterich Satomi Matsuzaki Ed Rodriguez Greg Saunier w/Deron Pulley SPECIAL THANKS TO: Michal Strychalski Marta Bajko Maryline Charrondiere Luca Bottura Christian Giloux Rodrigue Faes Mariane Catallon Georgina Hobgen Hailey Reissman Marine Bass

  4. Britain exhibition at CERN

    CERN Multimedia

    Bertin; CERN PhotoLab

    1969-01-01

    The United Kingdom inaugurated the Industrial Exhibitions in 1968, and it wasn't till 1971 that other countries staged exhibitions at CERN. This photo was taken in 1969, at the second British exhibition, where 16 companies were present.

  5. Indian President visits CERN

    CERN Multimedia

    Katarina Anthony

    2011-01-01

    On 1 October, her Excellency Mrs Pratibha Devisingh Patil, President of India, picked CERN as the first stop on her official state visit to Switzerland. Accompanied by a host of Indian journalists, a security team, and a group of presidential delegates, the president left quite an impression when she visited CERN’s Point 2!   Upon arrival, Pratibha Patil was greeted by CERN Director General Rolf Heuer, as well as senior Indian scientists working at CERN, and various department directors. After a quick overview of the Organization, Rolf Heuer and the President addressed India’s future collaboration with CERN. India is currently an Observer State of the Organization, and is considering becoming an Associate Member State. A short stop in LHC operations gave Steve Myers and the Accelerator team the opportunity to take the President on a tour through the LHC tunnel. From there, ALICE’s Tapan Nayak and Spokesperson Paolo Giubellino took Pratibha Patil to the experiment&am...

  6. Open Hardware at CERN

    CERN Multimedia

    CERN Knowledge Transfer Group

    2015-01-01

    CERN is actively making its knowledge and technology available for the benefit of society and does so through a variety of different mechanisms. Open hardware has in recent years established itself as a very effective way for CERN to make electronics designs and in particular printed circuit board layouts, accessible to anyone, while also facilitating collaboration and design re-use. It is creating an impact on many levels, from companies producing and selling products based on hardware designed at CERN, to new projects being released under the CERN Open Hardware Licence. Today the open hardware community includes large research institutes, universities, individual enthusiasts and companies. Many of the companies are actively involved in the entire process from design to production, delivering services and consultancy and even making their own products available under open licences.

  7. CERN stationery rejuvenated

    CERN Multimedia

    Anaïs Schaeffer

    2013-01-01

    With the introduction of CERN’s new graphic charter, our complete range of official communications stationery has been redesigned. Discover the newly harmonised and standardised range of CERN stationery.   As the Director-General announced in Bulletin 41-42/2012, a new graphic charter is now in force at CERN. The graphics team has taken this opportunity to redesign all the official CERN stationery, such as business cards, correspondence cards, letterheads, envelopes and file holders, all of which will now boast the same, unified format. In keeping with CERN’s new graphic charter, even the business cards have had a makeover: of a better quality than their predecessors, they now elegantly display the CERN colours (namely the familiar Pantone 286 blue). These new cards, which all follow a standardised format, help to project a standardised corporate image of the Organization. Order them online now! As the Director-General highlighted, “it's increasingly imp...

  8. CERN meets Facebook

    CERN Multimedia

    2012-01-01

    Social networking sites like LinkedIn, MySpace, Google+ and Facebook are on the rise. In particular, the life of youngsters revolves more and more around these sites as they facilitate communication, networking and the exchange of niceties. Who does not today already have an account registered with one of them? A Facebook profile can contain photos, listings of hobbies, job information, preferences…   The on-going effort to externalise some of CERN's computing resources continues, and in order to promote a unified interface for personal information, CERN has decided to establish a partnership with Facebook starting on 1stApril. "CERN is a public and trustworthy international organisation, and as such, our staff and users have nothing to hide from the general public," said Alexi Spiner (IT), project leader responsible for this migration: * The computer profiles of all CERN users will be integrated into the Facebook portal; * In addition, we will also ...

  9. Rejuvenating CERN's Accelerators

    CERN Multimedia

    2004-01-01

    In the coming years and especially in 2005, CERN's accelerators are going to receive an extensive renovation programme to ensure they will perform reliably and effectively when the LHC comes into service.

  10. CERN Science and Technology

    OpenAIRE

    Di Meglio, Alberto

    2015-01-01

    A high-level overview of the relationship between science and technology at CERN and the impact of technology on research with a focus on ICT technologies. Presented as a 12-minute "power-talk" at CIOCity 2015, Brussels

  11. PACMAN at CERN

    CERN Multimedia

    2015-01-01

    PACMAN Particle Accelerator Components Metrology and Alignment to the Nanometre scale. PACMAN is an Innovative Doctoral Program Network, offering training to 10 Early Stage Researchers hosted by CERN thanks to The European Commission FP7 Marie Curie Actions.

  12. YOUR LIFE@CERN

    CERN Multimedia

    Guinot, Genevieve

    2016-01-01

    Balancing work and home life, getting support for your family and thriving in an inclusive and respectful workplace: find out more about the support structures in place to enhance your working life@CERN!

  13. CERN at ESOF 2016

    CERN Multimedia

    James Gillies

    2016-01-01

    CERN had a major presence at the ESOF2016 conference this week, largely in collaboration with our EIROforum partners. A keynote session featuring the CERN Director-General, Fabiola Gianotti, EMBL Director-General, Iain Mattaj, and ESO Director for Science, Rob Ivison, and chaired by BBC science correspondent Pallab Ghosh debated the value of European collaboration in science.   The focal point of EIROforum’s presence was a stand highlighting the societal benefit of EIROforum science. (Image: Matt Wilkinson Photography/ ESOF 2016) A double session covered the science of the EIROs, with ATLAS physicist Claire Lee representing CERN, and there was a session exploring the ways that the EIROforum organisations create business value locally, with the leader of the Knowledge Transfer group, Giovanni Anelli, representing CERN. The focal point of EIROforum’s presence was a stand highlighting the societal benefit of EIROforum science. Side events linked to the stand discussed subjects su...

  14. La nascita del CERN

    CERN Multimedia

    Fidecaro, Giuseppe

    2004-01-01

    CERN was born on 30th September 1954, after the ratification of the Convention by the Member States. After the war, there was a need for international collaboration to rebuild the half-destroyed Europe (2 pages)

  15. Iran approaches CERN

    CERN Multimedia

    2002-01-01

    Members of Parliament from the Islamic Republic of Iran visit SM18. From left to right : Ali Mojtahed-Shabestari, Deputy Ambassador of the Islamic Republic of Iran in Geneva, Diether Blechschmidt, from CERN, Abdol-Rahim Baharvand and Hossain Amiri, from the Iranian Parliament, Norbert Siegel, from CERN, Hossain Afarideh, Rasool Seddighi and Ahmad Shirzad from the Iranian Parliament. Five members of the Parliament of the Islamic Republic of Iran visited CERN for three days at the beginning of May. All of them have PhD's in Physics, as well as holding their job in politics. They are involved in legislation for science, research and education funding in Iran. Apart from their interest in CERN in general, they were especially attracted to the CMS detector, since an Iranian contribution to the LHC is now starting through a collaboration with the Institute for Studies in Theoretical Physics and Mathematics in Tehran.

  16. CERN 1981-8

    International Nuclear Information System (INIS)

    At the CERN Council Meeting in December, the Director General traditionally gives an end-of-year review. This time the presentation took on added significance as it marked the end of the eight-year mandate of Herwig Schopper, who handed over on 1 January to Carlo Rubbia. Looking back over those eight years, Schopper pointed out several major trends. The dramatic growth in CERN 'users' (the scientists coming to the Laboratory to do their research) has led to CERN's research programme becoming really worldwide. The attrition of having to operate an expanding Laboratory under a constant budget has produced in its wake a healthy increase in the efficiency of CERN's big machines and experimental facilities

  17. CERN recognises LHC suppliers

    CERN Multimedia

    2002-01-01

    CERN has just presented the first awards recognising LHC suppliers. The Russian institute BINP, the Belgian firm Cockerill-Sambre and the US company Wah-Chang are the recipients of the first 'Golden Hadrons'.

  18. CERN scientists predict supernova

    CERN Multimedia

    2003-01-01

    "A team of theoretical physicists working at CERN and the Technion Institute of Technology in Israel has developed a theory to account for the mysterious gamma ray bursts that come from the depths of the Universe" (1/2 page).

  19. CERN confirms LHC schedule

    CERN Multimedia

    2003-01-01

    The CERN Council held its 125th session on 20 June. Highlights of the meeting included confirmation that the LHC is on schedule for a 2007 start-up, and the announcement of a new organizational structure in 2004.

  20. Safety at CERN

    CERN Multimedia

    2009-01-01

    Safety is an integral part of our working lives, and should be in our minds whatever job we do at CERN. Ultimately, safety is the responsibility of the Director General – your safety is my concern. That’s why I have this week appointed a new Safety Policy Committee (SAPOCO) that reflects the new Organizational structure of CERN. CERN’s Staff Rules and Regulations clearly lay out in chapter 3 the scope of safety at CERN as well as my responsibilities and yours in safety matters. At CERN, safety is considered in the broadest sense, encompassing occupational Health and Safety, environmental protection, and the safety of equipment and installations. It is my responsibility to put appropriate measures in place to ensure that these conditions are met. And it is the responsibility of us all to ensure that we are fully conversant with safety provisions applicable in our areas of work and that we comply with them. The appointment of a n...

  1. Fusion Revisits CERN

    CERN Multimedia

    2001-01-01

    It's going to be a hot summer at CERN. At least in the Main Building, where from 13 July to 20 August an exhibition is being hosted on nuclear fusion, the energy of the Stars. Nuclear fusion is the engine driving the stars but also a potential source of energy for mankind. The exhibition shows the different nuclear fusion techniques and research carried out on the subject in Europe. Inaugurated at CERN in 1993, following collaboration between Lausanne's CRPP-EPFL and CERN, with input from Alessandro Pascolini of Italy's INFN, this exhibition has travelled round Europe before being revamped and returning to CERN. 'Fusion, Energy of the Stars', from 13 July onwards, Main Building

  2. CERN expositions permanentes

    CERN Document Server

    2016-01-01

    Explore by yourself the issues CERN's physicists are trying to solve: given that the entire universe is made of particles, where do they come from? Why do they behave in the way they do? Discover the massive apparatus used by physicists at CERN, like the LHC, and see how each part works. And if you have more time on site, follow the LHC circuit at ground level to understand in situ this giant machine. Enter our exhibitions. Welcome!

  3. Future Perspectives at CERN

    OpenAIRE

    Ellis, John

    2002-01-01

    Current and future experiments at CERN are reviewed,with emphasis on those relevant to astrophysics and cosmology. These include experiments related to nuclear astrophysics, matter-antimatter asymmetry, dark matter, axions, gravitational waves, cosmic rays, neutrino oscillations, inflation, neutron stars and the quark-gluon plasma. The centrepiece of CERN's future programme is the LHC, but some ideas for perspectives after the LHC are also presented.

  4. Cern Women's Club

    CERN Multimedia

    Cern Women's Club

    2014-01-01

      CERN WOMEN’S CLUB   Coffee Morning Tuesday 10th  June 2014, 12:30   Annual Club Lunch at the restaurant “Le Coq Rouge” in St-Genis-Pouilly Those interested in helping should come along. New arrivals and all members are cordially invited. You can enrol for membership, renew membership, find out about and sign up for our activities. Visit our website: http://web.cern.ch/Club-WomensClub/

  5. Cern women's club

    CERN Document Server

    Club des cernoises

    2014-01-01

    CERN WOMEN’S CLUB Coffee Morning Tuesday 13th  May 2014, 9:30 Bldg 504,  (Restaurant No 2 – DSR) 1st Floor, Club Room 3   Annual General Meeting Those interested in helping should come along. New arrivals and all members are cordially invited. You can enrol for membership, renew membership, find out about and sign up for our activities. Visit our website: http://cern.ch/Club-WomensClub/

  6. CERN, Accelerating Science

    CERN Multimedia

    De Melis, Cinzia

    2015-01-01

    What is the Universe made of? Where did it come from, where is it going and why does it behave the way it does? These are some of the questions that CERN set out to address when a small number of pioneering scientists created Europe’s first scientific international organization. Founded in 1954, in the aftermath of the Second World War, CERN is not only a first-class centre for fundamental research but also a pioneering adventure in international collaboration.

  7. CERN permanent exhibitions

    CERN Multimedia

    2016-01-01

    Explore by yourself the issues CERN's physicists are trying to solve: given that the entire universe is made of particles, where do they come from? Why do they behave in the way they do? Discover the massive apparatus used by physicists at CERN, like the LHC, and see how each part works. And if you have more time on site, follow the LHC circuit at ground level to understand in situ this giant machine. Enter our exhibitions. Welcome!

  8. The CERN's year

    International Nuclear Information System (INIS)

    CERN, the European organization for nuclear research, has just celebrated its fifty years of existence. Its first goal was to counterbalance the migration of physics scientists towards the USA by the creation of a physics laboratory gathering scientists from the different European countries. Today, the CERN's mission has changed and has overcome all the expectations of its founders. In 2008, it will become, with the LHC (Large Hadron Collider), the biggest particle accelerator in the world. The CERN employs about 3000 physicists, engineers, technicians and workers. There is also 6500 people from 80 different countries who use the CERN's facilities during the year. The CERN is controlled by 20 European member states and 6 observer countries, and 20 non-member countries participate to the programs in progress. The CERN's power comes from its international and cosmopolitan spirit. The whole most famous physicists of the world can work together for the progress of science and for a better understanding of matter, of its interactions and of our universe. Two Nobel prices of physics come from the CERN: C. Rubbia and S. Van der Meer in 1983 for the discovery of W+, W- and Z0 bosons, and G. Charpak for the development of particle detectors. One can foresee that the LHC will allow new scientific achievements, like for instance, during experiments for the quest of the famous Higgs boson. It is important also to mention that the CERN has been at the origin of several technological innovations in all technical and engineering domains in the framework of its fundamental physics researches. (J.S.)

  9. CERN Library | Agnes Chavez @ CERN | 3 May

    CERN Multimedia

    CERN Library

    2016-01-01

    Agnes Chavez is an artist and educator participating in a two-week research stay through the ATLAS Experiment at CERN.   Tuesday 3 May at 4 p.m. CERN Library (52 1-052) Artist/educator, Agnes Chavez will share video outcomes from Projecting Particles, an Art + Science + Education collaboration with ATLAS. The Sci-Art project combines the International Masterclass with Projection Art in a series of teen-led youth workshops and projection events. In this presentation Chavez will share her vision and describe the research and development behind the project, now in its third year.  For the Projecting pARTicles series of art installations she has formed an interdisciplinary team of programmers, artists, scientists and educators to investigate how we can create art and education interventions inspired by emerging particle physics theories. Chavez’s art experiments with data visualization, sound and projections to create participatory environments. She collaborates with programmers t...

  10. CREATIVE COLLISIONS: ARTS @CERN

    CERN Document Server

    CERN. Geneva

    2012-01-01

    In 2000, CERN hosted Signatures of the Invisible – one of the landmark initiatives in arts and science. In 2012, CERN is now initiating its own science/arts programme Collide@CERN in different arts disciplines. The first of these is in digital arts, and the international competition to find the winning artist is called the Prix Ars Electronica Collide@CERN. It was announced September 2011 at CERN’s first collaboration with an international arts festival – Ars Electronica in Linz. The competition attracted over 395 entries from 40 countries around the world. The winning artist, Julius Von Bismarck, will begin his two month residency here at CERN next month. Ariane Koek who leads on this initiative, discusses the residency programme, as well as the background about Art@CERN. History has shown that particle physics and the arts are great inspiration partners. The publication of the paper by Max Planck which gave birth to quantum mechanics as well as those by Einstein, heavily influenced some of the grea...

  11. Sharing resources@CERN

    CERN Multimedia

    2002-01-01

    The library is launching a 'sharing resources@CERN' campaign, aiming to increase the library's utility by including the thousands of books bought by individual groups at CERN. This will improve sharing of information among CERN staff and users. Until now many people were unaware that copies of the same book (or standard, or journal) are often held not only by the library but by different divisions. (Here Eduardo Aldaz, from the PS division, and Isabel Bejar, from the ST division, read their divisional copies of the same book.) The idea behind the library's new sharing resources@CERN' initiative is not at all to collect the books in individual collections at the CERN library, but simply to register them in the Library database. Those not belonging to the library will in principle be unavailable for loan, but should be able to be consulted by anybody at CERN who is interested. "When you need a book urgently and it is not available in the library,' said PS Division engineer Eduardo Aldaz Carroll, it is a sham...

  12. CERN openlab Open Day

    CERN Multimedia

    Andrew Purcell

    2015-01-01

    CERN openlab is the unique public-private partnership between CERN and leading companies in the field of information and communication technology. The programme is now entering an exciting new phase and is expanding to include other public research organisations for the first time. A special event will be held at CERN to mark this occasion.   CERN openlab was created in 2001 and is now entering its fifth three-year phase (2015-2017). Its mission is to accelerate the development of cutting-edge solutions to be used by the scientific community to control the operations of complex machines and to analyse the vast amounts of data produced by physics experiments. During Run 2 of the LHC, it is expected that the CERN Data Centre will store more than 30 petabytes of data per year from the LHC experiments, which is equivalent to about 1.2 million Blu-ray discs, or 250 years of HD video. Testing in this demanding environment provides the companies collaborating in CERN openlab with valuable feedback o...

  13. CERN Relay Race

    CERN Multimedia

    Running Club

    2010-01-01

    This year’s CERN Relay Race will take place around the Meyrin site on Thursday 20th May at 12h00. This annual event is for teams of 6 runners covering distances of 1000m, 800m, 800m, 500m, 500m and 300m respectively. Teams may be entered in the Seniors, Veterans, Ladies, Mixed or Open categories. The registration fee is 10 CHF per runner, and each runner receives a souvenir prize. As usual, there will be a programme of entertainments from 12h in the arrival area, in front of the Restaurant no. 1. Drinks, food, CERN club information and music will be available for the pleasure of both runners and spectators. The race starts at 12h15, with results and prize giving at 13:15.   For details of the race, and of how to sign up a team, please visit: https://espace.cern.ch/Running-Club/CERN-Relay The event is organised by the CERN Running Club with the support of the CERN Staff Association.  

  14. CERN Pensioners Association

    CERN Multimedia

    The GAC Committee

    2004-01-01

    Open Day To all CERN retired staff As part of the celebrations organised for the 50th anniversary of CERN, an Open Day will be held on Saturday 16 October 2004. Anyone willing to act as a guide, either to help and inform visitors at the reception points or to guide groups of visitors, sharing your knowledge with them, is invited to fill in the attached form. A preparatory meeting will be arranged for those who left CERN some time ago and whose knowledge of the site may no longer be quite up-to-date. The Open Day organisers need your help, which will be very much appreciated. We hope that many pensioners will participate. People with internet access may enrol directly without coming to CERN, http://www.cern.ch/CERN50/openday The GAC Committee OPEN DAY : CALL FOR VOLUNTEERS 16th October 2004 So now you are excited about the Open Day, how can you participate? As you can imagine, for such a large number of activities, we need many volunteers. Please return the following form to Elena Battis...

  15. CERN In Focus

    CERN Multimedia

    CERN audiovisual service

    2008-01-01

    First edition 2008 of Cern in Focus. On behalf of the audiovisual team, a selection of the latest videos filmed at CERN. Every six weeks, we will bring you the latest in CERN's activities, from LHC start up to the Computing Grid, featuring the experiments and many other goings-on at CERN. The agenda of this first edition of CERN in Focus features the visit of the prime minister of Malta, Lawrence Gonzi... CMS and the final descent of the YE-1 end cap... The departure of UA1 magnets to Japan... The start up of sectors 4 and 5... And finally, in our sports round up... We'll talk about football. New in brief this month... The final bolt is in place : On 7th November, in the bowels of the LHC tunnel, CERN's Director General Robert Aymar tightened a gold-plated bolt for the last arc interconnection of sector 1-2. This symbolic gesture marks the completion of all the arc interconnections of the LHC. Last welding work: it was never going to be an easy task. On this day last year just one sector had been completed,...

  16. Proton movies

    CERN Multimedia

    2009-01-01

    A humorous short film made by three secondary school students received an award at a Geneva film festival. Even without millions of dollars or Hollywood stars at your disposal, it is still possible to make a good science fiction film about CERN. That is what three students from the Collège Madame de Staël in Carouge, near Geneva, demonstrated. For their amateur short film on the LHC, they were commended by the jury of the video and multimedia festival for schools organised by the "Media in education" service of the Canton of Geneva’s Public Education Department. The film is a spoof of a television news report on the LHC start-up. In sequences full of humour and imagination, the reporter conducts interviews with a very serious "Professor Sairne", some protons preparing for their voyage and even the neutrons that were rejected by the LHC. "We got the idea of making a film about CERN at the end of the summer," explains Lucinda Päsche, one of the three students. "We did o...

  17. 90 deg.Neutron emission from high energy protons and lead ions on a thin lead target

    CERN Document Server

    Agosteo, S; Foglio-Para, A; Mitaroff, W A; Silari, Marco; Ulrici, L

    2002-01-01

    The neutron emission from a relatively thin lead target bombarded by beams of high energy protons/pions and lead ions was measured at CERN in one of the secondary beam lines of the Super Proton Synchrotron for radiation protection and shielding calculations. Measurements were performed with three different beams: sup 2 sup 0 sup 8 Pb sup 8 sup 2 sup + lead ions at 40 GeV/c per nucleon and 158 GeV/c per nucleon, and 40 GeV/c mixed protons/pions. The neutron yield and spectral fluence per incident ion on target were measured at 90 deg.with respect to beam direction. Monte-Carlo simulations with the FLUKA code were performed for the case of protons and pions and the results found in good agreement with the experimental data. A comparison between simulations and experiment for protons, pions and lead ions have shown that--for such high energy heavy ion beams--a reasonable estimate can be carried out by scaling the result of a Monte-Carlo calculation for protons by the projectile mass number to the power of 0.80-0...

  18. CERN Academic Training Programme 2011

    CERN Multimedia

    PH Department

    2011-01-01

    LECTURE SERIES 1, 2 and 3 February 2011 11:00-12:00 - Bldg. 222-R-001 - Filtration Plant LHC 2010: Summary of the Odyssey So Far and Near-Term Prospects by Paris Sphicas (CERN) In 2010, the LHC delivered proton-proton collisions at an energy of 7 TeV, significantly higher than what was previously attained. This has allowed the experiments to complete the commissioning of the detectors and to perform early measurements of key standard model processes. The inclusive production of particles, jets and photons, the observation of onia and heavy-flavored meson decays, the measurement of the W and Z cross sections, and the observation of top-quark production and decay constitute a full set of measurements which form the base from which searches for physics beyond the standard model can be launched. The results from a number of searches for supersymmetry and some exotic signatures are now appearing. The lectures will review this impressive list of physics achievements from 2010 and consider briefly what 2011 m...

  19. An on-line evaluation of the relative mean radial position of the CERN PS beam using a high-precision chronometer

    International Nuclear Information System (INIS)

    A method of evaluating on-line the relative Mean Radial Position (MRP) of the beam in the CERN Proton Synchrotron based on the radio-frequency acceleration of the beam is discussed. A high-precision chronometer capable of measuring the time for a set number of periods of oscillation of the acceleration radio frequency with an accuracy of -+0.5 nsecs is used. This high accuracy means that the evaluation may be carried out without recourse to the computation of the first differentials with respect to time of frequency or flux density and with an accuracy better than 0.2 mm. This method of MRP measured is much simpler than previous procedures and permits a continuous measurement every cycle or supercycle depending on the synchronization used. (U.K.)

  20. Spotlight on CERN : Recruitment and professions at CERN

    CERN Multimedia

    CERN video productions

    2010-01-01

    Spotlight on CERN No. 3 Recruitment and professions at CERN Welcome to the Globe of Science and Innovation for this third edition of "Spotlight on CERN". When one thinks about professions at CERN, what springs to mind? Physicists? Engineers? In fact, the smooth operation of the Organisation relies on a diversity of professions and this in itself, poses a real challenge in terms of recruitment in CERN member states. Today, to tell us more about this challenge and about CERN professions in general, we welcome James Purvis, Head of the HR Recruitment, Programmes and Monitoring group, and Lore Taillieu, leader of the group's Recruitment section.

  1. The CERN Neutrino beam to Gran Sasso (NGS)

    CERN Document Server

    Bailey, R; Ball, A E; Bonnal, P; Buhler-Broglin, Manfred; Détraz, C; Elsener, Konrad; Ereditato, A; Faugeras, Paul E; Ferrari, A; Fortuna, G; Grant, A L; Guglielmi, A M; Hilaire, A; Hübner, Kurt; Jonker, M; Kissler, Karl Heinz; López-Hernandez, L A; Maugain, J M; Migliozzi, P; Palladino, Vittorio; Pietropaolo, F; Revol, Jean Pierre Charles; Sala, P R; Sanelli, C; Stevenson, Graham Roger; Vassilopoulos, N; Vincke, H H; Weisse, E; Wilhemsson, M

    1999-01-01

    The conceptual technical design of the NGS (CERN neutrino beam to Gran Sasso) facility has been presented in the report CERN 98-02 / INFN-AE/98-05. Additional information, in particular an update on various neutrino beam options for the NGS facility, has been provided in a memorandum to the CERN-SPSC Committee (CERN-SPSC/98-35). In the present report, further improvements on the NGS design and performance, in particular new scenarios for SPS proton cycles for NGS operation and a new version of the NGS "high energy" neutrino beam for nt appearance experiments, are described. This new NGS reference beam is estimated to provide three times more nt events per year than the beam presented in the 1998 report. The radiological aspects of the NGS facility have been re-examined with the new beam design. An updated version of the construction schedule is also presented.

  2. Beam diagnostics with synchrotron radiation

    International Nuclear Information System (INIS)

    Synchrotron radiation is often used to measure the dimensions of an electron beam. The transverse size is obtained from an image of the beam cross section formed by means of the emitted synchrotron radiation. Because of the small natural opening angle the resolution is limited by diffraction. The angular spread of the particles in the beam can be measured by observing the radiation directly. Here, the resolution is limited by the natural opening angle of the emitted light. Measuring both beam cross section and angular spread gives the emittance of the beam. However, in most cases only one of these two parameters is observed and the other deduced from the known particle beam optics at the source of the radiation. Usually one observes radiation emitted in long bending magnets. However, short magnets and undulators are also useful sources for these measurements. For practical reasons the beam diagnostics is carried out using visible or ultraviolet light. This part of the spectrum is usually far below the critical frequency, and corresponding approximations can be applied. Synchrotron radiation is an extremely useful tool for diagnostics in electron (or positron) rings. In some cases it has also served in proton rings using special magnets. (author)

  3. HOM Couplers for CERN SPL Cavities

    CERN Document Server

    Papke, Kai; Van Rienen, U

    2013-01-01

    Higher-Order-Modes (HOMs) may affect beam stability and refrigeration requirements of superconducting proton linacs such as the SPL, which is studied at CERN as the driver for future neutrino facilities. In order to limit beam-induced HOM effects, CERN considers the use of HOM couplers on the cut-off tubes of the 5-cell superconducting cavities. These couplers consist of resonant antennas shaped as loops or probes, which are designed to couple to modes of a specific frequency range. In this paper the design process is presented and a comparison is made between various design options for the medium and high-beta SPL cavities, both operating at 704.4 MHz. The RF characteristics and thermal behaviour of the various designs are discussed.

  4. Progress report on CERN activities (June 1981)

    International Nuclear Information System (INIS)

    Selected topics illustrate results obtained at CERN, mostly during the first half of 1981. The report deals first with the development of facilities for antiproton accumulation and acceleration, and for colliding beams of antiprotons and protons. Other developments of accelerators and of particle detectors are also presented. An outline is then given of the current understanding of the constituents of matter and of the forces acting between them. This framework is used for the presentation of CERN's experimental results. The topics covered include tests of the quark-parton model, properties of the new particles containing charm or beauty quarks, studies of the structure of the nucleon, tests of quantum chromodynamics (QCD), and investigations of the weak interaction. (orig.)

  5. CAS CERN Accelerator School second advanced accelerator physics course

    International Nuclear Information System (INIS)

    The advanced course on general accelerator physics given in West Berlin closely followed that organised by the CERN Accelerator School at Oxford in September 1985 and whose proceedings were published as CERN Yellow Report 87-03 (1987). However, certain subjects were treated in a different way, improved or extended, while some new ones were introduced and it is all of these which are included in the present proceedings. The lectures include particle-photon interactions, high-brilliance lattices and single/multiple Touschek effect, while the seminars are on the major accelerators presently under construction or proposed for the near future, applications of synchrotron radiation, free-electron lasers, cosmic accelerators and crystal beams. Also included are errata, and addenda to some of the lectures, of CERN 87-03. (orig.)

  6. Performance of the ALICE experiment at the CERN LHC

    NARCIS (Netherlands)

    Meddi, F.; Menchaca-Rocha, A.; Meninno, E.; Mercado Pérez, J.; Meres, M.; Miake, Y.; Mikhaylov, K.; Milano, L.; Milosevic, J.; Mischke, A.; Mishra, A. N.; Mis̈kowiec, D.; Mitu, C. M.; Mlynarz, J.; Mohanty, B.; Molnar, L.; Montano Zetina, L.; Montes, E.; Morando, M.; Moreira De Godoy, D. A.; Moretto, S.; Morreale, A.; Morsch, A.; Muccifora, V.; Mudnic, E.; Muhuri, S.; Mukherjee, M.; Müller, H.; Munhoz, M. G.; Murray, S.; Musa, L.; Musinsky, J.; Nandi, B. K.; Nania, R.; Nappi, E.; Nattrass, C.; Nayak, T. K.; Nazarenko, S.; Nedosekin, A.; Nicassio, M.; Niculescu, M.; Nielsen, B. S.; Nikolaev, S.; Nikulin, S.; Nikulin, V.; Nilsen, B. S.; Noferini, F.; Nomokonov, P.; Nooren, G.; Nyanin, A.; Nystrand, J.; Oeschler, H.; Oh, S.; Oh, S. K.; Okatan, A.; Olah, L.; Oleniacz, J.; Oliveira Da Silva, A. C.; Onderwaater, J.; Oppedisano, C.; Ortiz Velasquez, A.; Oskarsson, A.; Twinowski, J.; Oyama, K.; Sahoo, P.; Pachmayer, Y.; Pachr, M.; Pagano, P.; Paić, G.; Painke, F.; Pajares, C.; Pal, S. K.; Palmeri, A.; Pant, D.; Papikyan, V.; Pappalardo, G. S.; Pareek, P.; Park, W. J.; Parmar, S.; Passfeld, A.; Patalakha, D. I.; Paticchio, V.; Paul, B.; Pawlak, T.; Peitzmann, T.; Pereira Da Costa, H.; Pereira De Oliveira Filho, E.; Peresunko, D.; Pérez Lara, C. E.; Pesci, A.; Pestov, Y.; Petráček, V.; Petran, M.; Petris, M.; Petrovici, M.; Petta, C.; Piano, S.; Pikna, M.; Pillot, P.; Pinazza, O.; Pinsky, L.; Piyarathna, D. B.; Ploskoń, M.; Planinic, M.; Pluta, J.; Pochybova, S.; Podesta-Lerma, P. L M; Poghosyan, M. G.; Pohjoisaho, E. H O; Polichtchouk, B.; Poljak, N.; Pop, A.; Porteboeuf-Houssais, S.; Porter, J.; Pospisil, V.; Potukuchi, B.; Prasad, S. K.; Preghenella, R.; Prino, F.; Pruneau, C. A.; Pshenichnov, I.; Puccio, M.; Puddu, G.; Punin, V.; Putschke, J.; Qvigstad, H.; Rachevski, A.; Raha, S.; Rak, J.; Rakotozafindrabe, A.; Ramello, L.; Raniwala, R.; Raniwala, S.; Räsänen, S. S.; Rascanu, B. T.; Rathee, D.; Rauf, A. W.; Razazi, V.; Read, K. F.; Real, J. S.; Redlich, K.; Reed, R. J.; Rehman, A.; Reichelt, P.; Reicher, M.; Reidt, F.; Renfordt, R.; Reolon, A. R.; Reshetin, A.; Rettig, F.; Revol, J. P.; Reygers, K.; Riabov, V.; Ricci, R. A.; Richert, T.; Richter, M.; Riedler, P.; Riegler, W.; Riggi, F.; Rivetti, A.; Rocco, E.; Rodríguez Cahuantzi, M.; Rodriguez Manso, A.; Rd, K.; Rogochaya, E.; Rohni, S.; Rohr, D.; Röhrich, D.; Romita, R.; Ronchetti, F.; Ronflette, L.; Rosnet, P.; Rossegger, S.; Rossi, A.; Roukoutakis, F.; Roy, A.; Roy, C.; Roy, P.; Rubio Montero, A. J.; Rui, R.; Russo, R.; Ryabinkin, E.; Ryabov, Y.; Rybicki, A.; Sadovsky, S.; Safarík, K.; Sahlmuller, B.; Sahoo, R.; Sahu, P. K.; Saini, J.; Salgado, C. A.; Salzwedel, J.; Sambyal, S.; Samsonov, V.; Sanchez Castro, X.; Sánchez Rodríguez, F. J.; Sándor, L.; Sandoval, A.; Sano, M.; Santagati, G.; Sarkar, D.; Scapparone, E.; Scarlassara, F.; Scharenberg, R. P.; Schiaua, C.; Schicker, R.; Schmidt, C.; Schmidt, H. R.; Schuchmann, S.; Schukraft, J.; Schulc, M.; Schuster, T.; Schutz, Y.; Schwarz, K.; Schweda, K.; Scioli, G.; Scomparin, E.; Scott, P. A.; Scott, R.; Segato, G.; Seger, J. E.; Selyuzhenkov, I.; Seo, J.; Serradilla, E.; Sevcenco, A.; Shabetai, A.; Shabratova, G.; Shahoyan, R.; Shangaraev, A.; Sharma, N.; Sharma, S.; Shigaki, K.; Shtejer, K.; Sibiriak, Y.; Siddhanta, S.; Siemiarczuk, T.; Silvermyr, D.; Silvestre, C.; Simatovic, G.; Singaraju, R.; Singh, R.; Singha, S.; Singhal, V.; Sinha, C. B.; Sinha, T.; Sitar, B.; Sitta, M.; Skaali, T. B.; Skjerdal, K.; Smakal, R.; Smirnov, N.; Snellings, R. J M; Saard, C.; Soltz, R.; Song, J.; Song, M.; Soramel, F.; Sorensen, S.; Spacek, M.; Sputowska, I.; Spyropoulou-Stassinaki, M.; Srivastava, B. K.; Stachel, J.; Stan, I.; Stefanek, G.; Steinpreis, M.; Stenlund, E.; Steyn, G.; Stiller, J. H.; Stocco, D.; Stolpovskiy, M.; Strmen, P.; Suaide, A. A P; Subieta Vasquez, M. A.; Sugitate, T.; Suire, C.; Suleymanov, M.; Sultanov, R.; Sumbera, M.; Susa, T.; Symons, T. J M; Szanto De Toledo, A.; Szarka, I.; Szczepankiewicz, A.; Szymanski, M.; Takahashi, J.; Tangaro, M. A.; Tapia Takaki, J. D.; Tarantola Peloni, A.; Tarazona Martinez, A.; Tarzila, M. G.; Tauro, A.; Tejeda Muñoz, G.; Telesca, A.; Terrevoli, C.; Ter Minasyan, A.; Thäder, J.; Thomas, D.; Tieulent, R.; Timmins, A. R.; Toia, A.; Torii, H.; Trubnikov, V.; Trzaska, W. H.; Tsuji, T.; Tumkin, A.; Turrisi, R.; Tveter, T. S.; Ulery, J.; Ullaland, K.; Uras, A.; Usai, G. L.; Vajzer, M.; Vala, M.; Valencia Palomo, L.; Vallero, S.; Vande Vyvre, P.; Vannucci, L.; Van Der Maarel, J.; Van Hoorne, J. W.; Van Leeuwen, M.; Vargas, A.; Varma, R.; Vasileiou, M.; Vasiliev, A.; Vechernin, V.; Veldhoen, M.; Velure, A.; Venaruzzo, M.; Vercellin, E.; Vergara Limón, S.; Vernet, R.; Verweij, M.; Vickovic, L.; Viesti, G.; Viinikainen, J.; Vilakazi, Z.; Villalobos Baillie, O.; Vinogradov, A.; Vinogradov, L.; Vinogradov, Y.; Virgili, T.; Vislavicius, V.; Viyogi, P. Y.; Vodopyanov, A.; Völkl, M. A.; Voloshin, K.; Voloshin, S. A.; Volpe, G.; Von Haller, B.; Vorobyev, I.; Vranic, D.; Vrláková, J.; Vulpescu, B.; Vyushin, A.; Wagner, B.; Wagner, J.; Wagner, V.; Wang, M.; Wang, Y.; Watanabe, D.; Weber, M.; Weber, S. G.; Wessels, J. P.; Westerhoff, U.; Wiechula, J.; Wikne, J.; Wilde, M.; Wilk, G.; Wilkinson, J.; Williams, M. C S; Windelband, B.; Winn, M.; Xiang, C.; Yaldo, C. G.; Yamaguchi, Y.; Yang, H.; Yang, P.; Yang, S.; Yano, S.; Yasnopolskiy, S.; Yi, J.; Yin, Z.; Yoo, I. K.; Yushmanov, I.; Zaccolo, V.; Zach, C.; Zaman, A.; Zampolli, C.; Zaporozhets, S.; Zarochentsev, A.; Závada, P.; Zaviyalov, N.; Zbroszczyk, H.; Zgura, I. S.; Zhalov, M.; Zhang, H.; Zhang, X.; Zhang, Y.; Zhao, C.; Zhigareva, N.; Zhou, D.; Zhou, F.; Zhou, Y.; Zhu, H.; Zhu, J.; Zhu, X.; Zichichi, A.; Zimmermann, A.; Zimmermann, M. B.; Zinovjev, G.; Zoccarato, Y.; Zynovyev, M.; Zyzak, M.

    2014-01-01

    ALICE is the heavy-ion experiment at the CERN Large Hadron Collider. The experiment continuously took data during the first physics campaign of the machine from fall 2009 until early 2013, using proton and lead-ion beams. In this paper we describe the running environment and the data handling proced

  7. A Ring Imaging Cerenkov detector for the CERN OMEGA spectrometer

    International Nuclear Information System (INIS)

    A large acceptance Ring Imaging Cerenkov detector has been constructed for use at the CERN Omega Spectrometer. The design of the detector is discussed, with attention paid to its principal components, and preliminary results are given which show that the detector is capable of identifying pions and protons at 100 GeV/c. (author)

  8. CERN: End of an era; Scintillating fibre tracking in action

    International Nuclear Information System (INIS)

    After twelve years, the UA1 experiment at CERN's proton-antiproton collider is over. The idea of a big detector to provide information on all emerging particles was an integral part of Carlo Rubbia's bold 1976 proposal to harness antimatter for research

  9. CERN Relay Race

    CERN Document Server

    2009-01-01

    The CERN relay race, now in its 39th year, is already a well-known tradition, but this year the organizers say the event will have even more of a festival feeling. Just off the starting line of the CERN relay race.For the past few years, spectators and runners at the CERN relay race have been able to enjoy a beer while listening to music from the CERN music and jazz clubs. But this year the organizers are aiming for "even more of a festival atmosphere". As David Nisbet, President of the CERN running club and organizer of the relay race, says: "Work is not just about getting your head down and doing the theory, it’s also about enjoying the company of your colleagues." This year, on top of music from the Santa Luis Band and the Canettes Blues Band, there will be demonstrations from the Aikido and softball clubs, a stretching session by the Fitness club, as well as various stalls and of course, the well-earned beer from AGLUP, the B...

  10. Inspired by CERN

    CERN Multimedia

    2004-01-01

    Art students inspired by CERN will be returning to show their work 9 to 16 October in Building 500, outside the Auditorium. Seventeen art students from around Europe visited CERN last January for a week of introductions to particle physics and astrophysics, and discussions with CERN scientists about their projects. A CERN scientist "adopted"each artist so they could ask questions during and after the visit. Now the seeds planted during their visit have come to fruition in a show using many media and exploring varied concepts, such as how people experience the online world, the sheer scale of CERN's equipment, and the abstractness of the entities scientists are looking for. "The work is so varied, people are going to love some pieces and detest others," says Andrew Charalambous, the project coordinator from University College London who is also curating the exhibition. "It's contemporary modern art, and that's sometimes difficult to take in." For more information on this thought-provoking show, see: htt...

  11. Spaceflight participant visits CERN!

    CERN Multimedia

    Kathryn Coldham

    2016-01-01

    On 15 July, CERN welcomed spaceflight participant Anousheh Ansari.   Anousheh Ansari’s grin stretches from ear to ear, during an intriguing conversation with Nobel laureate Samuel C.C. Ting at AMS POCC. (Image: Maximilien Brice/CERN) Iranian-American Anousheh Ansari was the first-ever female spaceflight participant, spending eight days on the International Space Station (ISS) in 2006. She now has a new addition to her list of extraordinary sights ­– the home of the world’s largest particle accelerator: CERN.   On 15 July, Anousheh Ansari came to CERN and, unsurprisingly, visited the control room of the experiment attached to the ISS: the AMS. At the AMS Payload Operations Control Centre (AMS POCC) on CERN’s Prévessin site, she met the Nobel laureate Samuel Ting, spokesperson of the AMS experiment. Ansari and her accompanying guests were thrilled to expand their knowledge about CERN, its research and its...

  12. CERN CAR STICKERS

    CERN Multimedia

    Service Accueil et Controle d'Accès; ST Division

    1999-01-01

    In accordance with Operational Circular n¡ 2, paragraph 21, CERN car stickers are to be renewed. The new stickers are now available and will be valid for a year.Youare therefore requested:either to obtain them from the distribution points for new stickers (see below); or to send us the application form below, duly completed, via the internal mail; or to complete the application form directly via the Web at the address: http://cern.ch/registration-stickers. Each vehicle has to carry a sticker and needs a separate application form.Vehicles bearing CERN diplomatic plates (CD07, 431K and CD series) do not need a sticker for access to the CERN areas.Thank you.List of distribution points:Registration Service (bldg 55 1st floor), open from 07h30 to 16h30. Building 33 (entrance hall), open from 08h00 to 18h00. Building 120 (ground floor), outside working hours.Name Surname CERN identification number Vehicle registration plates Country issuing the plates Vehicle ma...

  13. Radiography at CERN

    CERN Multimedia

    HSE Unit

    2014-01-01

    What is industrial radiography? It is a non-destructive method with a wide variety of applications, such as inspecting the quality of a weld. It uses high-energy radioactive sources or an X-ray generator.   Is this inspection technique used at CERN? Yes, it is widely used at CERN by the EN-MME Group, which outsources the work to one or more companies, depending on the workload. Is it possible to carry out radiography anywhere at CERN? Yes, it is possible to carry out radiography in any building/accelerator/experiment area at CERN (including in areas which are not normally subject to radiological hazards). When is radiography carried out? It normally takes place outside of working hours (7 p.m. to 6 a.m.). How will I know if radiography is taking place in my building? If this activity is planned in a CERN building, notices will be affixed to all of its main entrance doors at least 24 hours in advance. What are the risks? There is a risk of exposure to very high levels of radiation, dep...

  14. Apprenticeship at CERN

    CERN Multimedia

    Staff Association

    2016-01-01

    In 1961, based on the finding that the evolution of the labour market created a growing need for qualified staff, a first agreement between the Republic and Canton of Geneva and CERN was signed. One of the objectives of this agreement was the vocational training of young electronics and physics laboratory technicians. CERN, an important stakeholder in the local economy, highlighted with this agreement its willingness to participate in the local social and economic development. The first apprentice arrived at CERN in 1965. In 1971, the apprenticeship centre was created; it now hosts over twenty apprentices in total and welcomes about six new apprentices each year. These apprenticeships are for young people aged between 15 and 21 years, coming from one of the CERN Member States, and having completed their mandatory education, e.g. 11th grade in Switzerland or 3ème in France. The training is divided between working time at CERN and one or two days per week at school (CFPT in Geneva for electronics or ...

  15. CERN television news

    CERN Document Server

    2002-01-01

    CERN events brought right to your desktop by the new video bulletin.   CERN now has its very own news broadcast , or rather 'webcast', with a host of special reports and even a star presenter. From today onwards, just go to the Bulletin's web page, click on the 'video news' link and sit back and enjoy the latest news about CERN, presented in images by Wendy Korda. The ten-minute newscast in both French and English, the Organization's two official languages, presents interviews, pictures of experiments and computer-generated graphics, bringing you right up to date with some of the Laboratory's latest stories. The show concludes with a selection of the best snapshots taken by the CERN Photo Lab. So every one or two months CERN's Audio-Video Service (ETT/DH) will be putting together a video news report that you can watch on your own desktop computer. Daniel Boileau, Patrick Gilbert de Vautibault and Jacques Fichet, the Service's three technicians, came up with the idea of producing this regular feat...

  16. EU Commissioner visits CERN

    CERN Multimedia

    2005-01-01

    European Commissioner Viviane Reding in front of one of the computers showing how the Grid works and, from left to right, Robert Aymar, CERN's Director-General, Wolfgang von Rüden, Head of the Information Technology Department, and Bob Jones, the newly appointed director of the EGEE project since 1st November. Viviane Reding, European Commissioner for Information Society and Media, visited CERN on 28 October. Accompanied throughout by CERN's Director-General, Robert Aymar, and the Head of the Information Technology Department, Wolfgang von Rüden, the Commissioner visited the ATLAS cavern before going on to the Information Technology Department, where she was given a complete overview of CERN's activities in the strategic field of Grid computing. Viviane Reding's visit coincided with the end of the EGEE (Enabling Grids for E-sciencE) conference, which took place in Pisa in Italy. Co-ordinated by CERN and funded by the European Commission, the EGEE project aims to set up a worldwide grid infrastructure for sc...

  17. Lectures for CERN pensioners

    CERN Multimedia

    SC Unit

    2008-01-01

    The CERN Medical Service and the Pensioners Association are pleased to invite CERN pensioners to a series of lectures given by professors and specialists from the Teaching Hospitals and the Faculty of Medicine of the University of Geneva on the following topic: PROMOTION OF OPTIMUM BRAIN AGEING The lectures will take place in the Main CERN Auditorium (Building 60) from 2.30 p.m. to 4.30 p.m. on the following dates: Wednesday 12 November 2008: Assessing the extent of brain ageing Dr Dina ZEKRY Friday 12 December 2008: Can memory decline be prevented? Pr Jean-Pierre MICHEL Thursday 15 January 2009: Diagnosing and treating Alzheimer’s disease Pr Gabriel GOLD Wednesday 25 February 2009: What is the brain reserve? Speaker’s name to be announced at a later date The lectures will be given in French, with transparencies in English, and will be followed by a wide-ranging debate with the participants. CERN Medical Service - Pensioners Association - CERN-ESO (GAC-EPA)

  18. CERN Phonebook evolution

    CERN Multimedia

    Sébastien Dellabella

    2012-01-01

    Consolidating phonebooks at CERN We have had many phonebooks in the past, Xwho (now decommissioned), the NICE phonebook on Windows PCs, and more recently the web site people.cern.ch. However, diversity doesn’t always equate to improved efficiency or quality. So in order to reduce the maintenance effort and to improve the user experience, we have consolidated these various phonebooks into a single web application: phonebook.cern.ch Motivations for change The NICE Phonebook was introduced in the year 2000 when Windows 95 was the major desktop platform. Since then, a lot has changed not only in technology and the desktop landscape but also in the variety of devices used to access the data (notably smartphones and tablets). Updating the NICE phonebook is slow. Once the master database is modified it can take up to two days for the data to propagate to the application. Thus, we are now planning the retirement of the NICE phonebook application. The new Phonebook.cern.ch The new phonebook.cern.ch...

  19. IMPEDANCE CONSIDERATIONS FOR THE DESIGN OF THE VACUUM SYSTEM OF THE CERN PS2

    Energy Technology Data Exchange (ETDEWEB)

    Bane, K.L.F.; Stupakov, G.; Wienands, U.; Benedikt, M.; Grudiev, A.; Mahner, E.; /SLAC /CERN

    2010-08-26

    In order for the LHC to reach an ultimate luminosity goal of 10{sup 35}/cm{sup 2}/s, CERN is considering upgrade options for the LHC injector chain, including a new 50 GeV synchrotron of about 1.3 km length for protons and heavy ions, to be called the PS2 [1]. The proton energy will be ramped from 4 GeV to 50 GeV in 1.2 s, and the design proton current for LHC operation is 2.7 A. In the LARP framework, we are studying the instability thresholds and the impedance requirements of the vacuum system for the PS2. Goal of this study is to develop an impedance budget for the machine. We consider the standard single and multi-bunch collective effects that may be an issue in the PS2. For single bunch, we study the microwave instability and the transverse mode coupling instability (TMCI); for multi-bunch, the transverse coupled bunch instability. While the impedance budget will include many components in the machine, at present, we only have sufficient information to include the resistance of the beam pipe, the vacuum flanges that connect the various pieces of the vacuum chamber, and space charge impedance in our estimate. Note that earlier estimates of the impedance and its effects in the PS2 can be found in Ref. [2]. Table 1 presents selected PS2 parameters that will be used in the calculations. The equations used, unless indicated otherwise, can be found in Ref. [3].

  20. CERN/KEK: Very high accelerating gradients

    International Nuclear Information System (INIS)

    Full text: A world-wide effort is under way to develop linear electron-positron colliders so that physics experiments can be extended into a range of energies where circular machines (necessarily much larger than CERN's 27-kilometre LEP machine) would be crippled by synchrotron radiation. CERN is studying the feasibility of building a 2 TeV machine called CLIC powered not by individual klystrons, but by a high intensity electron 'drive' linac running parallel to the main linac (November 1990, page 7). This drive linac will itself be powered by similar superconducting cavities to those developed for LEP. A high gradient is an obvious design aim for any future high energy linear collider because it makes it shorter and therefore cheaper - the design figure for the CLIC machine is 80 MV/m. The CLIC study group has taken a significant step forward in demonstrating the technical feasibility of their machine by achieving peak and average accelerating gradients of 137 MV/m and 84 MV/m respectively in a short section of accelerating structure during high gradient tests at the Japanese KEK Laboratory last year. This result obtained within the framework of a CERN/KEK collaboration on linear colliders was obtained using a 20-cell accelerating section built at CERN using state-of the- art technology which served both as a model for CLIC studies as well as a prototype for the Japanese Linear Collider studies. The operating frequency of the model accelerating section is 2.6 times lower than the CLIC frequency but was chosen because a high power r.f. source and pulse compression scheme has been developed for this frequency at KEK. Testing CLIC models at 11.4 GHz is however more stringent than at 30 GHz because the chance of electrical breakdown increases as the frequency is lowered. This recent result clearly demonstrates that a gradient of 80 MV/m is feasible

  1. Dalai Lama at CERN

    International Nuclear Information System (INIS)

    On 30 August CERN turned aside from its usual day-to-day preoccupations when Director-General Herwig Schopper played host to the Dalai Lama of Tibet and his entourage during the holy man's 1983 visit to Europe. In welcoming his visitor, Professor Schopper stressed the role of particle physics in helping to understand man's place in the cosmos, and how the Dalai Lama's interest would further the interrelation of science, philosophy and religion. The Dalai Lama visited the UA 1 experiment (rolled back into its 'garage' during the present fixed target operations at CERN) and the large installations for the neutrino experiments in the West Area of the SPS machine. There was an intriguing exchange of views with CERN theorists, who described how science has continually modified our view of the world around us

  2. Safety alarms at CERN

    CERN Document Server

    Ninin, P; Henny, L

    1998-01-01

    In order to operate the CERN accelerators complex safely, the acquisition, transport and management of safety alarms is of crucial importance. The French regulatory authority [Direction de Sûreté des Installations Nucléaires de Base (INB)] defines them as Level 3 alarms; they represent as such a danger for the life and require an immediate intervention of the Fire Brigade. Safety alarms are generated by fire and flammable gas detection systems, electrical emergency stops, and other safety related systems. Level 3 alarms are transmitted for reliability reasons to their operation centre: the CERN Safety Control Room (SCR) using two different media: the hard-wired network and a computer based system. The hard-wired networks are connected to local panels summarizing in 34 security areas the overall CERN geography. The computer based system offers data management facilities such as alarm acquisition, distribution, archiving and information correlation. The Level 3 alarms system is in constant evolution in order...

  3. CERN welcomes European science

    CERN Multimedia

    2002-01-01

    On 3 and 4 October CERN will host a special workshop for Marie Curie fellows. This programme is a key plank in the EU's strategy for creating a European research area.     With thousands of scientists from all over the continent working together, CERN is already an exemplary European science showcase. On 3 and 4 October, the Laboratory will contribute further to unifying all European science by hosting a special workshop for EU-funded Marie Curie fellows. This scheme gives young researchers from around the continent the mobility to go to wherever Europe's best facilities in their chosen field happen to be. The event that will take place at CERN, entitled 'Special workshop of Marie Curie Fellows on research and training in physics and technology', organised together with the European Commission, is a continuation of a series of workshops with the aim, among others, of promoting young researchers, supporting their training and mobility, and facilitating the interdisciplinary dissemination of knowledge. Dur...

  4. CERN UN Roundtable

    CERN Document Server

    CERN. Geneva; Del Rosso, Antonella; Gillies, James

    2014-01-01

    In the spirit of strengthening links and sharing best practices among the two Organizations, UNOG and CERN will be jointly organizing a round table discussion on the issue of “The challenge of communicating science and technology to the world: issues and solutions”. It is hoped that the discussions can highlight the experience of various organizations and institutions in their efforts to communicate and inform in several languages on topics – science and technology – that are often perceived as distant and arduous by the layman. ==>> Please note that registrations are now closed. It is not necessary to register for this event if you plan to watch it live on http://webcast.cern.ch. Send your questions to the speakers by email to: question@cern.ch

  5. CERN's new safety policy

    CERN Multimedia

    2014-01-01

    The documents below, published on 29 September 2014 on the HSE website, together replace the document SAPOCO 42 as well as Safety Codes A1, A5, A9, A10, which are no longer in force. As from the publication date of these documents any reference made to the document SAPOCO 42 or to Safety Codes A1, A5, A9 and A10 in contractual documents or CERN rules and regulations shall be deemed to constitute a reference to the corresponding provisions of the documents listed below.   "The CERN Safety Policy" "Safety Regulation SR-SO - Responsibilities and organisational structure in matters of Safety at CERN" "General Safety Instruction GSI-SO-1 - Departmental Safety Officer (DSO)" "General Safety Instruction GSI-SO-2 - Territorial Safety Officer (TSO)" "General Safety Instruction GSI-SO-3 - Safety Linkperson (SLP)" "General Safety Instruction GSI-SO-4 - Large Experiment Group Leader In Matters of Safety (LEXGLI...

  6. Kandinsky College Visits CERN

    CERN Multimedia

    CERN Video productions; Angelos Alexopoulos

    2012-01-01

    This video documents the visit of nine senior high school students of the Kandinsky College in Nijmegen (Netherelands) to CERN. The students visited many of CERN's experimental facilities, took part in a Cloud Chamber workshop, attended talks and roundtable discussions of SpacePart12 and worked on the evaluation of the Microcosm exhibition as part of a school inquiry-based research project. The students and their teacher, Paul de Haas (a participant of the High School Teachers 2012 Programme at CERN) were connected with Prof. Christine Kourkoumelis and George Vasileiadis at the University of Athens and learned hands-on how to analyse real physics events, including Higgs-like ones, from the ATLAS experiment at the LHC using the HYPATIA Applet.

  7. Cern Cricket Club

    CERN Multimedia

    Cern Cricket Club

    2014-01-01

      Cern Cricket Club The CERN Cricket Club 2014 season has started earlier than usual, with a game scheduled for the first time ever on Easter Sunday.  Due to repair work for the damage done to the ground because of the “Bosons&More” party at the end of September, all games until June have had to be scheduled away. Net practice, which normally takes place on the ground from mid-April, will not start until mid-June. The club is always looking for new players and newcomers will be made very welcome. Anyone who is interested in joining the club should sign up on our web site: http://cern.ch/Club-Cricket/    

  8. CERN Relay Race

    CERN Multimedia

    2005-01-01

    The CERN Relay Race will take place around the Meyrin site on Wednesday 18 May between 12.15 and 12.35. This year, weather permitting, there will be some new attractions in the start/finish area on the field behind the Main Building. You will be able to: listen to music played by the CERN Jazz Club; buy drinks at the bar organised by the CERN Running Club; buy lunch served directly on the terrace by the restaurant Novae. ATTENTION: concerning traffic, the recommendations are the same as always: If possible, please avoid driving on the site during this 20 minute period. If you do meet runners in your car, please STOP until they all have passed. Thank you for your understanding.

  9. The MedAustron Project at CERN, Status Report, May 2013

    CERN Document Server

    Benedikt, M; Gutleber, J

    2013-01-01

    MedAustron is a light ion-therapy and research centre based on a synchrotron accelerator complex under construction in Austria. It is the first large-scale accelerator facility in Austria. For the implementation of the required accelerator technologies, the county of Lower Austria and the company EBG MedAustron have set up dedicated agreements with CERN. These cover the assistance of CERN for the design and manufacturing follow-up of accelerator components and training of MedAustron personnel. CERN contributed to the MedAustron construction in particular by providing domain expertise, infrastructure, and manpower in relation with the design, the tendering and procurement processes.\

  10. CERN Relay Race

    CERN Document Server

    2008-01-01

    The CERN relay race will take place around the Meyrin site on Thursday 5 June starting at 12:15 p.m. If possible, please avoid driving on the site during this 20-minute period. If you do meet runners while driving your car, please STOP until they have all passed. Thank you for your cooperation. Details on how to register your team for the relay race are given on the Staff Association Bulletin web site. You can access the online registration form at: http://cern.ch/club-running-relay/form.html

  11. The significance of Cern

    CERN Multimedia

    Weisskopf,V

    Le Prof. V.Weisskopf, DG du Cern de 1961 à 1965, est né à Vienne, a fait ses études à Göttingen et a une carrière académique particulièrement riche. Il a travaillé à Berlin, Copenhague et Berlin et est parti aux Etats Unis pour participer au projet Manhattan et était Prof. au MTT jusqu'à 1960. Revenu en Europe, il a été DG du Cern et lui a donné l'impulsion que l'on sait.

  12. CERN Technical Training : Vista !

    CERN Multimedia

    HR Department

    2009-01-01

    Are you running Vista on your new PC – or are you planning to install it? The Technical Training service is organizing a half-day training course on the new features of the VISTA operating system. This course introduces the new interfaces and presents the new functionalities for people who are experienced in the use of Windows XP. The next bilingual session of this course will take place on 30 January 2009. Register using our catalogue: http://cta.cern.ch/cta2/f?p=110:9 or contact us with your questions/comments at mailto:Technical.Training@cern.ch

  13. CERN Technical Training : Vista !

    CERN Multimedia

    HR Department

    2008-01-01

    Are you running Vista on your new PC – or are you planning to install it? The Technical Training service is organizing a half-day training course on the new features of the VISTA operating system. This course introduces the new interfaces and presents the new functionalities for people who are experienced in the use of Windows XP. The next bilingual sessions of this course will take place on 12 December 2008 and 30 January 2009. Register using our catalogue: http://cta.cern.ch/cta2/f?p=110:9 or contact us with your questions/comments at mailto:Technical.Training@cern.ch

  14. CERN Technical Training : Vista !

    CERN Multimedia

    HR Department

    2008-01-01

    You are running Vista on your new PC – or are planning to install it? The Technical Training service is organizing a half-day training course on the new features of the VISTA operating system. This course introduces the new interfaces and presents the new functionalities for people who are experienced in the use of Windows XP. The next bilingual sessions of this course will take place on 12 December 2008 and 30 January 2009. Register using our catalogue: http://cta.cern.ch/cta2/f?p=110:9 or contact us with your questions/comments at mailto:Technical.Training@cern.ch

  15. CERN Technical Training : Vista !

    CERN Multimedia

    HR Department

    2008-01-01

    Are you running Vista on your new PC – or are planning to install it? The Technical Training service is organizing a half-day training course on the new features of the VISTA operating system. This course introduces the new interfaces and presents the new functionalities for people who are experienced in the use of Windows XP. The next bilingual sessions of this course will take place on 12 December 2008 and 30 January 2009. Register using our catalogue: http://cta.cern.ch/cta2/f?p=110:9 or contact us with your questions/comments at Technical.Training@cern.ch

  16. CERN Technical Training : Vista !

    CERN Multimedia

    HR Department

    2008-01-01

    You are running Vista on your new PC – or are planning to install it? The Technical Training service is organizing a half-day training on the new features of the VISTA operating system. This course introduces the new interfaces and presents the new functionalities for people who are experienced using Windows XP. The next bilingual sessions of this course will take place on December 12, 2008 and January 30, 2009. Register using our catalogue : http://cta.cern.ch/cta2/f?p=110:9 or contact us with your questions/comments at Technical.Training@cern.ch

  17. Poland at CERN

    CERN Multimedia

    CERN Press Office. Geneva

    2000-01-01

    On 17 October 2000, the second Polish industrial and technological exhibition opens at CERN*. The first one was held five years ago and nine of the companies that were present then have come back again this year. Six of those companies were awarded contracts with CERN in 1995. Three Polish officials were present at the Opening Ceremony today: Mrs Malgorzata Kozlowska, Under-secretary of State in the State Committee for Scientific Research, Mr Henryk Ogryczak, Under-secretary of State in Ministry of Economy and Prof. Jerzy Niewodniczanski, President of National Atomic Energy Agency.

  18. CERN firemen share their expertise

    CERN Multimedia

    Maximilien Brice

    2002-01-01

    Firemen from local fire brigades have been coming to CERN to learn modern fire-fighting techniques. This apparatus allows the simulation of the spectacular backdraft phenomenon, so firemen training at CERN learn to understand it.

  19. CHINA Continuing cooperation with CERN

    International Nuclear Information System (INIS)

    During a visit to China in July, CERN Director General Carlo Rubbia signed an agreement with the Chinese Academy of Sciences which provides a reciprocal framework for CERN and China to continue and develop their scientific and technical cooperation

  20. CERN Diversity Newsletter - March 2016

    CERN Document Server

    Kaltenhauser, Kristin; CERN. Geneva. HR Department

    2016-01-01

    Quarterly CERN Diversity Newsletter, informing on recent and ongoing diversity activities, and interesting reads, videos and other links related to diversity. Subscribe here: https://diversity.web.cern.ch/2015/07/subscribe-diversity-newsletter

  1. CERN Diversity Newsletter - November 2015

    CERN Document Server

    Kaltenhauser, Kristin; CERN. Geneva. HR Department

    2015-01-01

    Quarterly CERN Diversity Newsletter, informing on recent and ongoing diversity activities, and interesting reads, videos and other links related to diversity. Subscribe here: https://diversity.web.cern.ch/2015/07/subscribe-diversity-newsletter

  2. Une flamme pour le CERN

    CERN Multimedia

    2004-01-01

    For the 50th anniversary of CERN, letters posted from Saint Genis will bear a postmark to celebrate CERN's anniversary. Envelopes are also available from the Saint-Genis-Pouilly (France) post office (3 paragraphs)

  3. CERN AWAKE Facility Readiness for First Beam

    CERN Document Server

    Bracco, Chiara; Butterworth, Andrew; Damerau, Heiko; Döbert, Steffen; Fedosseev, Valentin; Feldbaumer, Eduard; Gschwendtner, Edda; Höfle, Wolfgang; Pardons, Ans; Shaposhnikova, Elena; Vincke, Helmut

    2016-01-01

    The AWAKE project at CERN was approved in August 2013 and since then a big effort was made to be able to probe the acceleration of electrons before the "2019-2020 Long Shutdown". The next steps in this challenging schedule will be a dry run of all the beam line systems, at the end of the HW commissioning in June 2016, and the first proton beam sent to the plasma cell one month later. The current status of the project is presented together with an outlook over the foreseen works for operation with electrons in 2018.

  4. The CERN p-anti p complex

    International Nuclear Information System (INIS)

    CERN is currently extending its accelerator complex and experimental facilities to perform experiments with antiprotons from almost zero up to 540 GeV centre of mass energies. The key part of the enterprise is a 3.5 GeV accumulating ring (AA) relying entirely on stochastic cooling. Antiprotons will be collided against protons at centre of mass energies up to 540 GeV in the SPS, and up to 62 GeV in the ISR. A small additional machine, LEAR, will make a wealth of experiments possible at kinetic energies ranging from 5 MeV to 1.3 GeV. (Auth.)

  5. Spotlight on CERN : LHC is back !

    CERN Multimedia

    CERN video productions

    2009-01-01

    Welcome to the CERN Control Centre, which this weekend witnessed the restart of the LHC, more than a year after the initial launch on 10 September 2008. The atmosphere was electric as all eyes were trained on the monitors showing protons circulating in opposite directions at the injection energy of 450 giga-electronvolts. Today, I'm delighted to welcome Steve Myers, Director for Accelerators and Technology, who's here to tell us all about the restart of the LHC. But first let's enjoy some of the images that marked this historic day for the Organization.

  6. Inside CERN : Grosse Maschinen fur kleinste teilchen

    CERN Multimedia

    CERN Public Information Office

    1974-01-01

    A service station with a difference. Presentation of what goes on at CERN. Animation of protons going around a ring, then sent to a target and detectors look at them. SC. PS. ISR. Interesting animation: a red light is superimposed on the accelerator to indicate the beam path. (PS and ISR) BEBC. Scanning, with a nice moment of the tracks arriving. Omega. Tracks. Map showing where SPS will be. The Robbins. Other aspects of SPS construction: magnets, RF cavaties, vacuum tube.Comments : Calm, well constructed presentation without much film imagination, aside from the red light/beam animation.

  7. Hadron collider physics at the CERN SPS

    International Nuclear Information System (INIS)

    The results of the experiments of the CERN antiproton-proton collider, collected during the 1988 and 1989 runs, are summarized. The results of the W and Z hadronic decays are discussed. The results obtained from samples of W → e ν and Z → e+e- events for the W and Z production cross section times branching ratio and for pT are in good agreement with theoretical expectations. The measurements of W and Z mass are discussed. Lower limits of 61 GeV/c2 (UA1) and of 67 GeV/c2 (UA2) are reported for the mass of the top quark

  8. 1985 CERN-JINR school of physics

    International Nuclear Information System (INIS)

    The CERN School of Physics is intended to give young experimental physicists an introduction to the theoretical aspects of recent advances in elementary particle physics. These Proceedings contain reports of lecture series on the following topics: introduction to gauge fields, perturbative QCD, proton-antiproton collider physics, lattice quantum field theories, experiments on weak decays of leptons and quarks, lepton-hadron interactions, supersymmetry, grand unified theories and cosmology. They also include reports of special lectures on sum rules and hadron properties in QCD, on quark distribution in nuclei, and on the scientific programme of JINR. (orig.)

  9. Characterization of p-in-n ATLAS silicon microstrip detectors fabricated by Hamamatsu Photonics and irradiated with 24 GeV/c protons to $3*10^{14} pcm^{-2}$

    CERN Document Server

    Morgan, D; Carter, J R; Dawson, I; Hara, K; Harper, R; Iwata, Y; Kohriki, T; Kondo, T; Ohsugi, T; Robinson, D; Shimojima, M; Terada, S; Unno, Y

    1999-01-01

    P-in-n silicon microstrip prototype detectors for the ATLAS experiment at CERN have been designed and manufactured by Hamamatsu Photonics. Detectors were irradiated at the CERN Proton Synchrotron facility to a fluence of 3*10/sup 14/ pcm/sup -2/, corresponding to the total fluence anticipated after ten years of operation in the ATLAS semiconductor tracker. They were subsequently annealed for 7 days at 25 degrees C in order to reach the end of the beneficial annealing period and hence the minimum in depletion voltage. The characteristics of 4 different detector designs have been evaluated. The pre-irradiation behaviour of all detectors is consistent and well within the specifications for ATLAS detectors. Similarly, the post- irradiation and anneal performance for all detectors shows excellent behaviour. This is in terms of both the leakage current characteristics and the signal and noise performance as determined from LHC speed readout electronics. Tile detector characteristics are such that operation within t...

  10. CERN: Real and imaginary parts

    International Nuclear Information System (INIS)

    Full text: Elastic scattering (where particles bounce off each other) has implications which go far beyond the deceptive simplicity and inconsequence of this process. Several years ago, an elastic scattering result by the UA4 experiment at CERN's proton-antiproton collider (January 1988, page 32) set the high energy world talking. In quantum mechanics, the forward elastic scattering amplitude is a complex number whose real and imaginary parts can be related. The powerful 'optical theorem' relates the total reaction rate (cross-section) to the imaginary part of the forward scattering amplitude, while the ratio of the real and imaginary parts gives an indication of where the total reaction rate is going at higher energies, independent of what the actual mechanisms are. Thus, for example, elastic scattering measurements at CERN's Intersecting Storage Rings pointed the way to the behaviour eventually seen at the proton-antiproton collider. In the 1985 run, UA4 found the ratio (rho) between the real and the imaginary parts to be 0.24, about twice the theoretical prediction. At face value, this suggested that the total reaction rate would increase dramatically at higher collision energies. With such a prediction at stake, confirmation with a more precise measurement was necessary and the UA4/2 experiment (Genoa/ Palaiseau/Prague/Rome/Valencia collaboration) was launched. The real part of the scattering amplitude is obtained via measurements of elastic scattering in a four momentum transfer domain where strong and electromagnetic interactions are comparable. This corresponds to scattering angles of 100 microradians, with the detectors inside ''Roman pots'' close to the circulating beams, and using special beam optics. The new experiment took place in a five-week run late in 1991. With the Roman pots within 2mm of the beams, about a million elastic events were recorded. Several months later, a special dedicated run fixed the SPS

  11. Space-charge calculations in synchrotrons

    Energy Technology Data Exchange (ETDEWEB)

    Machida, S.

    1993-05-01

    One obvious bottleneck of achieving high luminosity in hadron colliders, such as the Superconducting Super Collider (SSC), is the beam emittance growth, due to space-charge effects in low energy injector synchrotrons. Although space-charge effects have been recognized since the alternating-gradient synchrotron was invented, and the Laslett tune shift usually calculated to quantify these effects, our understanding of the effects is limited, especially when the Laslett tune shift becomes a large fraction of the integer. Using the Simpsons tracking code, which we developed to study emittance preservation issues in proton synchrotrons, we investigated space-charge effects in the SSC Low Energy Booster (LEB). We observed detailed dependence on parameters such as beam intensity, initial emittance, injection energy, lattice function, and longitudinal motion. A summary of those findings, as well as the tracking technique we developed for the study, are presented.

  12. WILL I AM visits CERN

    CERN Multimedia

    Noemi Caraban

    2013-01-01

    Will.i.am visited CERN in December 2013, fulfilling a wish he made in a video-link appearance at TEDxCERN earlier that year http://tedxcern.web.cern.ch/video/choral-performance-reach-stars-william. During his visit, he was shown the Antimatter Decelerator, the underground ATLAS experiment cavern and the CERN Control Centre. He also took the opportunity to promote CERN’s beam line for schools competition.

  13. Proton Induced Effects on Tungsten Powder

    CERN Multimedia

    2012-01-01

    In the HRMT-10 experiment, that took place in HiRadMat facility of CERN/SPS, the effects of a high-power incident proton beam on a tungsten powder target were investigated. In this video, 1.3E11 protons @ 440 GeV are impinging on the target.

  14. Proton Induced Effects on Tungsten Powder

    CERN Multimedia

    2012-01-01

    In the HRMT-10 experiment, that took place in HiRadMat facility of CERN/SPS, the effects of a high-power incident proton beam on a tungsten powder target were investigated. In this video, 1.85E11 protons @ 440 GeV are impinging on the target.

  15. Proton Induced Effects on Tungsten Powder

    CERN Multimedia

    2012-01-01

    In the HRMT-10 experiment, that took place in HiRadMat facility of CERN/SPS, the effects of a high-power incident proton beam on a tungsten powder target were investigated. In this video, 2E11 protons @ 440 GeV are impinging on the target.

  16. Proton Induced Effects on Tungsten Powder

    CERN Multimedia

    HiRadMat facility of CERN/SPS

    2012-01-01

    In the HRMT-10 experiment, that took place in HiRadMat facility of CERN/SPS, the effects of a high-power incident proton beam on a tungsten powder target were investigated. In this video, 1.7E11 protons @ 440 GeV are impinging on the target.

  17. Proton Induced Effects on Tungsten Powder

    CERN Multimedia

    2012-01-01

    In the HRMT-10 experiment, that took place in HiRadMat facility of CERN/SPS, the effects of a high-power incident proton beam on a tungsten powder target were investigated. In this video, 2.64E11 protons @ 440 GeV are impinging on the target.

  18. Vacuum chambers full of ideas for the Swedish synchrotron

    CERN Multimedia

    Corinne Pralavorio

    2016-01-01

    CERN’s Vacuum, Surfaces and Coatings group has contributed to the development of vacuum chambers for the MAX IV synchrotron, which has just been officially opened in Sweden.   A section of the new 3 GeV MAX IV synchrotron at the time of installation. In the centre of the magnets you can see the vacuum chamber developed in collaboration with CERN. (Photo: Marek Grabski, MAX IV Vacuum group) On 21 June, the King and the Prime Minister of Sweden officially opened MAX IV, a brand-new synchrotron in Lund, Sweden. The summer solstice, the longest day of the year, was deliberately chosen for the ceremony: MAX IV, a cutting-edge synchrotron, will deliver the brightest X-rays ever produced to more than 2000 users. Some 1500 kilometres away, a team at CERN followed the opening ceremony with a touch of pride. The Vacuum, Surfaces and Coatings group in the Technology department (TE-VSC) participated in the construction of this new synchrotron. Its contribution lies at the very hea...

  19. Calculations of dose attenuation in slowly curving tunnel geometries at a high-energy proton accelerator

    CERN Document Server

    Vincke, Helmut H

    2003-01-01

    The CERN Neutrino beam to Gran Sasso (CNGS) project and the Large Hadron Collider (LHC) will receive 450 GeV/c protons extracted from the Super Proton Synchrotron (SPS). In the tunnels leading to the CNGS target and the LHC accelerator there is a 150 m straight section where a beam dump (TED) can be moved into the beam chamber, intercepting the proton beam. After the TED, the beam is routed into either the 700m slowly curving TT41 tunnel (CNGS) or the TI8 tunnel consisting of a 400 m straight section followed by a curved 1.5 km long tunnel (LHC). The curved tunnels have a radius of approximately 1 km. During tests a proton beam of 1.2 multiplied by 10**1**3 s**- **1 could be sent to the dump. The question posed was how close to the TED could access be allowed during dumping operations. Initial simulations using the FLUKA Monte-Carlo transport program were optimised assuming that the high-energy muon contribution dominates. Discrepancies with an analytically based calculation led to a revision of this optimisa...

  20. A High-power Superconducting H$^-$ Linac (SPL) at CERN

    CERN Document Server

    Chiaveri, Enrico

    2001-01-01

    The conceptual design of a superconducting H^- linear accelerator at CERN for a beam energy of 2.2 GeV and a power of 4 MW is presented. Using most of the superconducting RF cavities available after the decommissioning of LEP, it operates at 352 MHz and delivers 10^16 protons per second. At an early stage it will upgrade the performance of the PS complex by replacing Linac2 and the PS booster, by injecting protons directly into the PS. The brilliance of the LHC beam will thus be tripled. The present ISOLDE facility can be supplied with five times more beam current than to-day. In conjunction with an accumulator and a compressor, the purpose of its design is to be the proton driver of a neutrino factory at CERN.