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antiproton

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MOYCGM01 FAIR: Challenges Overcome and Still to be Met dipole, superconducting-magnet, ion, vacuum 17
 
  • H. Stöcker
    GSI, Darmstadt
  FAIR will be one of the leading accelerator facilities worldwide making use of a highly sophisticated and cost-effective accelerator concept. The intensity frontier will be pushed by several orders of magnitude for the primary and especially for the secondary beams. To reach the unprecedented beam parameters several technical challenges such as operation with high brightness, high current beams, control of the dynamic vacuum pressure or the design of rapidly cycling superconducting magnets have to be mastered. For most of those challenges solutions have been found and prototypes are being built. The remaining open questions are addressed in close collaborations with the partners of FAIR.  
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MOPC104 A New Method of Beam Stacking in Storage Rings emittance, storage-ring, simulation, synchrotron 307
 
  • C. M. Bhat
    Fermilab, Batavia, Illinois
  Use of barrier buckets at synchrotron storage rings has paved way for development of new techniques for beam stacking in storage rings. The Fermilab Recycler, anit-proton storage ring, has been augmented with multipurpose broad-band barrier rf systems. Recently we have developed a new beam accumulation scheme called "longitudinal phase-space coating" that can be used for stacking beam over already e-cooled high intensity low emittance antiproton beam and demonstrated with beam experiments. Multi-particle beam dynamics simulations convincingly validate the concepts and practicality of the method. Starting with a proof-of-principle beam experiment both protons and anti-protons have been stacked a number of times using this technique in the Recycler. We present the results from both simulations and experiments. The method presented here is the first of its kind.  
 
MOPC111 Lattice Studies for Spin-filtering Experiments at COSY and AD target, quadrupole, proton, lattice 322
 
  • A. Garishvili, A. N. Nass, E. Steffens
    University of Erlangen-Nürnberg, Physikalisches Institut II, Erlangen
  • A. Lehrach, B. Lorentz, R. Maier, F. Rathmann, R. Schleichert, H. Ströher
    FZJ, Jülich
  • P. Lenisa, M. Statera
    INFN-Ferrara, Ferrara
  • S. A. Martin
    UGS, Langenbernsdorf
  In the framework of the FAIR project, the PAX collaboration has proposed a research program based on polarized antiprotons. Polarized antiprotons are to be produced by spin-dependent attenuation on a polarized hydrogen target. For a better understanding of this mechanism it is planned to perform Spin-Filtering studies with protons at COSY (Jülich). In a second phase, it is envisioned to study Spin-Filtering with antiprotons at the AD (CERN). Which will allow for the determination of the total spin-dependent transverse and longitudinal cross sections. In order to achieve the required long storage times, a storage ring section has to be developed which minimizes the spin-independent losses due to Coulomb scattering. The Coulomb-loss cross section for single scattering losses at fixed energy is proportional to the acceptance angle. Therefore, at the target point the beta functions should be as small as possible. Fot the 'low-beta' section, superconducting quadrupole magnets are utilized. It is composed of two (COSY) and three (AD) SC quadrupoles on each side of the target. Results of the lattice studies and requirements for the superconducting quadrupole magnets will be discussed  
 
MOPC112 HESR Linear Lattice Design target, lattice, electron, betatron 325
 
  • B. Lorentz, A. Lehrach, R. Maier, D. Prasuhn, H. Stockhorst, R. Tölle
    FZJ, Jülich
  The High Energy Storage Ring (HESR) is a part of the future Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt. The ring is used for hadron physics experiments with a pellet target and the PANDA detector, and will supply antiprotons of momenta from 1.5 GeV/c to 15 GeV/c. The ring will consist of two 180 degree bending sections (arcs) of 157 m length, each, and two 132 m long straight sections. In one of the straight sections the PANDA experiment will be installed, the other straight section will be equipped with a High Energy Electron Cooler. A longitudinal and transverse stochastic cooling system will be used in the momentum range from 3.8 GeV/c to 15 GeV/c. Adjustment of beta functions at target and electron cooler, to achieve highest beam lifetimes, most efficient cooling and highest luminosities are the main design requirements. The basic design consists of FODO cell structures in the arcs. The arc quadrupole magnets are grouped into four families, to allow a flexible adjustment of transition energy, horizontal and vertical tune, and dispersion. The details of the linear lattice and operation modes will be discussed in this presentation.  
 
MOPC116 On the Possibility of Realizing Shortest Bunches in Low-energy Storage Rings storage-ring, ion, emittance, simulation 334
 
  • A. I. Papash, K.-U. Kuehnel, C. P. Welsch
    MPI-K, Heidelberg
  • A. A. Alzeanidi, M. O.A. El Ghazaly
    KACST, Riyadh
  • A. I. Papash
    JINR, Dubna, Moscow Region
  For some very interesting experiments in future low-energy storage rings it is highly desirable to realize ultra-short bunches in the nanosecond regime. These bunches could then be used for collision studies with atomic or molecular gas jet targets where the time structure of the bunches would be used as a trigger for the experiment. Thus, the control of the longitudinal time structure of the stored beam is of central importance since it directly determines the resolution of the envisaged experiments. Since many years, it has been a significant challenge for the storage ring accelerator-physics community to develop techniques to reduce the duration of bunches. Up to now, all methods that have been developed go along with various difficulties, which can include reduced stored-beam lifetimes. Thus, novel and innovative concepts for the manipulation and control of the longitudinal beam structure have to be developed. In this paper, novel approaches to realize shortest bunches in storage rings are presented.  
 
MOPC125 The HESR RF-system and Tests in COSY target, acceleration, synchrotron, injection 361
 
  • R. Stassen, K. Bongardt, F. J. Etzkorn, H. Stockhorst
    FZJ, Jülich
  • A. Schnase
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  Two RF cavities will be installed in the High-Energy Storage Ring (HESR) of the future International Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt, one “small” cavity for barrier-bucket operation and one “large” cavity to accelerate and decelerate the beam and for bunch rotation. Additionally a barrier bucket with h=1..5 will be formed by this cavity to separate the decelerated beam from the refilled beam in the high luminosity mode (HL). Both prototype cavities have been built and first RF measurements were carried out. The recent results will be presented.  
 
TUXG02 High Luminosity Operation, Beam-Beam Effects and Their Compensation in TEVATRON proton, electron, luminosity, collider 951
 
  • V. D. Shiltsev
    Fermilab, Batavia, Illinois
  During the recent years a remarkable increase of the TEVATRON luminosity was achieved. The presentation discusses the collider performance, how this was achieved and illustrates today's limitations. The TEVATRON will shutdown soon but many ideas that emerged from the TEVATRON are of great interest for future (hadron) colliders. As an example, the experience gained at the TEVATRON in understanding of beam-beam effects in hadron colliders and their compensation is highly relevant for future projects. Experimental results of the Tevatron Electron Lenses will be presented and possible use of similar lenses in LHC and RHIC will be discussed.  
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TUOBM01 Advanced Design of the FAIR Storage Ring Complex ion, storage-ring, injection, electron 1004
 
  • M. Steck, C. Dimopoulou, A. Dolinskii, O. E. Gorda, V. Gostishchev, K. Knie, S. A. Litvinov, I. Nesmiyan, F. Nolden, D. Obradors-Campos, C. Peschke
    GSI, Darmstadt
  The storage ring complex of the FAIR comprises three storage rings with a magnetic rigidity of 13 m. Each of the three rings, CR, RESR, and NESR, serves specific tasks in the preparation of secondary beams, rare isotopes and antiprotons, or for experiments with heavy ion beams. The CR is optimized for fast stochastic pre-cooling of secondary beams. The RESR design has been recently revised for optimum performance of antiproton accumulation. The concept for the installation of both rings in a common building is elaborated. The ion optical and engineering design of the NESR for experiments with heavy ions, the deceleration of ions or antiprotons for a subsequent low energy facility, and the accumulation of rare isotope beams is proceeding. A section for collision experiments with circulating ions and counter propagating electrons or antiprotons has been worked out. This report will give a summary of the various new concepts conceived in the process of the design of this new storage ring facility.  
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TUPC044 Towards Routine Operation of the Digital Tune Monitor in the Tevatron proton, betatron, pick-up, feedback 1155
 
  • V. Kamerdzhiev, V. A. Lebedev, A. Semenov
    Fermilab, Batavia, Illinois
  The digital tune monitor (DTM) was designed to measure bunch-by-bunch tunes in the Tevatron collider. It uses a standard BPM as a pickup. The vertical proton monitor is installed and allows us to gain valuable operational experience. A major upgrade is underway to implement an automatic bunch-by-bunch gain and offset adjustment to maintain the highest possible sensitivity under real operational conditions. Once the system is shown to be able to cope with orbit changes and different bunch intensities in an automatic manner while reliably delivering data it will be expanded to measure horizontal proton as well as antiproton tunes. The motivation and the technical description of the DTM as well as the latest experimental results are presented. Major challenges from the design and operation point of view are discussed.  
 
TUPC056 A Novel Beam Profile Monitor Based on a Supersonic Gas Jet target, ion, storage-ring, extraction 1182
 
  • K.-U. Kuehnel, M. Putignano, C. D. Schroeter, J. Ullrich, C. P. Welsch
    MPI-K, Heidelberg
  At very low residual gas pressure below 10-12 mbar, as foreseen in future low-energy storage rings currently under development at the MPI-K and FAIR, conventional residual gas beam profile monitors cease to work with reasonable count rates. One possible way to overcome this restriction is the use of a supersonic gas jet as a profile monitor. Such a jet could be shaped as a thin curtain, thus providing a uniform target with a variable target density extended over the whole beam. A possible setup of such a device taking into account vacuum considerations, expected count rates and an envisioned detection scheme are presented in this contribution.  
 
TUPC108 DITANET–A European Training Network on Novel Diagnostic Techniques for Future Particle Accelerators diagnostics, ion, storage-ring, instrumentation 1314
 
  • C. P. Welsch
    KIP, Heidelberg
  • C. P. Welsch
    GSI, Darmstadt
  Beam diagnostics systems are essential constituents of any particle accelerator; they reveal the properties of a beam and how it behaves in a machine. Without an appropriate set of diagnostic elements, it would simply be impossible to operate any accelerator complex let alone optimize its performance. Future accelerator projects will require innovative approaches in particle detection and imaging techniques to provide a full set of information about the beam characteristics. The European Training Network DITANET covers the development of advanced beam diagnostic methods for a wide range of existing or future accelerators, both for electrons and ions. The developments in profile, current, and position measurement techniques stretch beyond present technology and will mark the future state of the art. This contribution presents the scientific challenges that will be addressed within the next four years, together with the networks' structure.  
 
WEOCG03 RF Reference Signal Distribution System for FAIR target, controls, linac, ion 1935
 
  • M. Bousonville
    GSI, Darmstadt
  • P. Meissner
    TU Darmstadt, Darmstadt
  For the synchronisation of RF systems in the FAIR (Facility for Antiproton and Ion Research) synchrotrons and storage rings, an RF Reference Signal Distribution System is being developed. The FAIR RF cavities need signals with different phases and frequencies. Furthermore, frequency ramps with RF frequency ratios of up to 7 have to be realized in all rings. To enable this functionality, the distribution system provides two different clock signals to several locations within the facility that will be up to 1 km apart. By means of these clock signals, frequency generators can be synchronised that generate the RF signals needed for the cavities. For the transmission of the clock signals, an optical network based on the DWDM method (Dense Wavelength Division Multiplex) will be used. The delay will permanently be measured and by means of the delay data, a clock regenerator produces a phase synchronous and stable reference signal at the end of each transmission line. A delay measurement accuracy of better than 100 fs has been achieved. The presentation focuses on the design of the system as well as the performance of the prototype.  
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WEOBM01 R&D Activities Aimed at Developing a Curved Fast Ramped Superconducting Dipole for FAIR SIS300 dipole, synchrotron, coupling, ion 1950
 
  • P. Fabbricatore, S. Farinon, R. Musenich
    INFN Genova, Genova
  • F. Alessandria, G. Bellomo, G. Volpini
    INFN/LASA, Segrate (MI)
  • U. Gambardella
    INFN/LNF, Frascati (Roma)
  • J. E. Kaugerts, G. Moritz
    GSI, Darmstadt
  • R. Marabotto
    ASG, Genova
  • M. Sorbi
    Universita' degli Studi di Milano & INFN, Segrate
  One of the basic components of the FAIR facility, under development at GSI, is the synchrotron SIS300 (300 Tm rigidity). In order to reach the required high intensities of proton and heavy ion beams, the magnets of this synchrotron have to be pulsed from the injection magnetic field of 1.5 T up to 4.5 T maximum field at the rate of 1 T/s. These 7.8 m long, cos-teta shaped coils with a 100 mm bore have the particular characteristic to be curved (the sagitta is 114 mm). All these aspects demand for a challenging R&D, aimed at the development of a low loss conductor and of a suitable winding technology for curved coil. Further design issues are related to the optimization of the stress distribution involving materials able to hold 107 cycles and to the maximization of the heat transfer to coolant (supercritical helium at 4.7 K). At the present time, design activities are going on with the aim to design, construct and test a 3.8 m long prototype within 2009. In order to achieve this objective, several intermediate milestones are included in the R&D program. One of the most challenging is the industrial development of a method for winding a curved cos-teta dipole.  
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WEPD011 Development Work for a Short Curved Superconducting Dipole Magnet for the HESR at FAIR dipole, storage-ring, synchrotron, lattice 2425
 
  • F. M. Esser, R. Greven, G. Hansen, F. Klehr, J. Schillings, H. Soltner, R. Tölle
    FZJ, Jülich
  Forschungszentrum Juelich has taken the leadership of a consortium being responsible for the design of the High-Energy Storage Ring (HESR) going to be part of the FAIR project at GSI. Within these activities a design for a short cosine-theta superconducting dipole has been carried out together with industry partners. Its length will be approximately one third of the original HESR dipole whereas all other design parameter will be the same. The main design criterion is the short bending radius of 15.3 m of the magnet implying that the coil itself has a curved shape. Beside the geometrical design of the cold mass, this paper will focus particularly on the finite element calculations from the assembly through the cool down to the operating temperature of the magnet. First manufacturing tests as well as a status report on the achievements so far will be presented and future plans will be discussed.  
 
WEPD017 Full Size Prototype Magnets for Heavy Ion Superconducting Synchrotron SIS100 at GSI: Status of Manufacturing and Test at JINR dipole, quadrupole, synchrotron, ion 2443
 
  • A. D. Kovalenko, N. N. Agapov, A. V. Alfeev, A. V. Bychkov, A. V. Gromov, H. G. Khodzhibagiyan, G. L. Kuznetsov, A. Y. Starikov
    JINR, Dubna, Moscow Region
  • E. S. Fischer, G. Moritz, P. J. Spiller
    GSI, Darmstadt
  • A. V. Shabunov
    JINR/LHE, Moscow
  The SIS100 synchrotron is designed for acceleration of high intensity beams with a pulse repetition rate of 1 Hz. The use of superferric Nuclotron-type dipoles, quadrupoles and corrector magnets is planned in the accelerator magnetic system. The magnet coils are made of hollow NbTi composite cable cooled with two-phase helium flow at 4.5 K. The lattice comprises 108 dipoles, 168 quadrupoles and necessary set of steerer and multipole corrector magnets. We present recent results from the design and optimization of the SIS100 magnetic elements parameters. The status of manufacturing full size prototypes is presented. The essential features of the magnets production and the new test results are discussed.  
 
WEPP120 G4Beamline Particle Tracking in Matter-dominated Beam Lines simulation, collider, target, space-charge 2776
 
  • T. J. Roberts, K. B. Beard
    Muons, Inc, Batavia
  • S. Ahmed, D. M. Kaplan, L. K. Spentzouris
    Illinois Institute of Technology, Chicago, Illinois
  • D. Huang
    IIT, Chicago, Illinois
  Most computer programs that calculate the trajectories of particles in accelerators assume that the particles travel in an evacuated chamber. The development of muon beams, which are needed for future facilities such as muon colliders and neutrino factories, is limited by the lack of user-friendly numerical simulation codes that accurately calculate scattering and energy loss in matter. Geant4 is an internationally supported tracking toolkit that was developed to simulate particle interactions in large detectors for high energy physics experiments, and includes most of what is known about the interactions of particles and matter. Geant4 has been partially adapted in a program called G4beamline to develop muon beam line designs. We are continuing the development of G4beamline to enhance its graphical user-interface and add other features to the program to facilitate its use by a larger set of beam line and accelerator developers.  
 
THYM01 Simulation of Beam-beam Effects and Tevatron Experience proton, beam-beam-effects, emittance, simulation 2937
 
  • A. Valishev
    Fermilab, Batavia, Illinois
  Simulations of beam-beam effects in the Tevatron correctly describe reality, have predictive power and have been used to support a change in the Tevatron working point to near the half integer. The simulation models and tools are discussed, and comparisons made with observations and measurements.  
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THPC011 The CR-RESR Storage Ring Complex of the FAIR Project dynamic-aperture, extraction, injection, quadrupole 2996
 
  • A. Dolinskii, O. E. Gorda, S. A. Litvinov, F. Nolden, C. Peschke, I. Schurig, M. Steck
    GSI, Darmstadt
  • D. Obradors-Campos
    MICINN, Madrid
  In frame of the FAIR project (at GSI, Germany) the CR-RESR storage ring complex has been designed for efficient cooling, accumulation and deceleration of antiproton and rare isotopes beams. The complex consists of the Collector Ring (CR) and the accumulator / decelerator ring RESR. The large acceptance CR will be operated at three different optical modes, two of them providing fast pre-cooling of antiprotons and rare isotopes. This ring will be also used as an instrument for mass measurements of very short-lived nuclei when tuned to an isochronous mode. The RESR will be used as accumulator of the antiprotons by means of the stochastic cooling technique and as a decelerator of rare isotopes. The structure of the CR and RESR lattices and its ion optical properties are described in this contribution. The beam dynamics of these rings at different operation scenario are discussed.  
 
THPC074 Observation of Coherent Oscillations of Colliding Bunches at the Tevatron proton, collider, beam-beam-effects, pick-up 3158
 
  • A. Valishev, V. Kamerdzhiev, V. A. Lebedev
    Fermilab, Batavia, Illinois
  • F. A. Emanov
    BINP SB RAS, Novosibirsk
  Commissioning of the new digital tune monitor (DTM) at the Tevatron made it possible to observe vertical dipole oscillations of individual bunches at any time during an HEP store. Since all the bunches have significantly different collision conditions, this device provides vast possibilities for investigation of coherent beam-beam effects. We present theoretical model and experimental observations of coherent beam-beam modes. Analysis of the DTM data and its agreement with theory are discussed.  
 
THPC117 Measurements and Analysis of Beam Transfer Functions in the Fermilab Recycler Ring Using the Transverse Digital Damper System diagnostics, feedback, pick-up, kicker 3254
 
  • N. Eddy, J. L. Crisp, M. Hu
    Fermilab, Batavia, Illinois
  The Fermilab Recycler Ring Transverse Digital Damper System was designed to facilitate Beam Transfer Function measurements using a Network Analyzer connected to auxiliary system ports for timing and diagnostic purposes. The Digital Damper System has the capability for both open and closed loop measurements. The Beam Transfer Function measurements provide direct measurements of the machine impedance, beam stability, and beam parameters such as betatron tune and chromaticity. An overview of the technique is presented along with analysis and results from open and closed loop measurements in the Fermilab Recycler Ring.  
 
THPP016 Preliminary Design of a Highly-flexible Extraction Scheme for the USR extraction, lattice, septum, storage-ring 3407
 
  • Ph. Schmid, K.-U. Kuehnel, C. P. Welsch
    MPI-K, Heidelberg
  • A. I. Papash
    JINR, Dubna, Moscow Region
  In the future Facility for Low-energy Antiproton and Ion Research (FLAIR) at GSI, the Ultra-low energy electrostatic Storage Ring (USR) will provide cooled beams of antiprotons and possibly also highly charged ions down to energies of only 20 keV/q. Beams with small momentum spread and low emittance will enable a wide range of hitherto impossible experiments. The large variety of planned experiments requires a highly flexible longitudinal time structure of the extracted bunches, ranging from ultra-short pulses in the nanosecond regime to quasi DC beams. In this contribution, a preliminary design of the extraction scheme is presented. Furthermore, possible solutions for the compensation of effects from the extraction region on the very-low energy beam are shown, including results from beam transport calculations.  
 
THPP049 Status of Electron Cooler Design for HESR electron, vacuum, diagnostics, target 3473
 
  • B. Gålnander, T. Bergmark, S. Johnson, T. Johnson, T. Lofnes, G. Norman, T. Peterson, K. Rathsman, D. Reistad
    TSL, Uppsala
  • H. Danared
    MSL, Stockholm
  The HESR-ring of the future FAIR-facility at GSI will include both electron cooling and stochastic cooling in order to achieve the demanding beam parameters required by the PANDA experiment. The high-energy electron cooler will cool antiprotons in the energy range 0.8 GeV to 8 GeV. The design is based on an electrostatic accelerator and shall not exclude a further upgrade to the full energy of HESR, 14.1 GeV. The paper will discuss prototype tests of critical components and recent development in the design including the high-voltage tank, electron gun and collector, magnet system, electron beam diagnostics and the magnetic field measuring system.  
 
THPP051 Stochastic Cooling in the Framework of the FAIR Project at GSI pick-up, storage-ring, vacuum, cryogenics 3479
 
  • F. Nolden, A. Dolinskii, B. Franzke, U. Jandewerth, T. Katayama, C. Peschke, P. Petri, M. Steck
    GSI, Darmstadt
  • D. Möhl
    CERN, Geneva
  Stochastic cooling at FAIR will be one of the instruments to get cooled beams of rare isotopes and antiprotons for high resolution experiments. Stochastic cooling systems will be installed in the CR and RESR storage rings. The Collector Ring CR is a dedicated storage ring for the first step cooling of antiproton beams (3 GeV or β=0.97) produced at the antiproton production target, and of radioactive beams (740 MeV/u or β=0.83) prepared in the Super Fragment Separator. The pick-up and kicker systems have designs which allow very efficient cooling for both particle velocities. There will be different ring optical settings for optimum cooling of antiprotons or rare isotopes. Whereas the next cooling step for rare isotopes will be electron cooling, antiprotons will be accumulated in the RESR using a similar accumulation scheme which was formerly applied at the AA at CERN. The paper presents the CR and RESR system layouts and new hardware developments.  
 
THPP052 Electron Cooling Force Calculations for HESR electron, ion, plasma, beam-transport 3482
 
  • K. Rathsman, B. Gålnander, D. Reistad
    TSL, Uppsala
  • H. Danared
    MSL, Stockholm
  The High energy storage ring HESR at FAIR is being realized by a consortium consisting of Forschungszentrum Jülich, GSI Darmstadt and Uppsala University. An important feature of this new facility is the combination of phase-space cooled beams and dense internal targets. Charmonium spectroscopy, which is one of the main items in the experimental program, requires antiproton momentum up to 8.9 GeV/c with a resolution of dp/p=0.00001. This can only be achived with electron cooling. The electron cooler proposed for HESR allows beam cooling between 1.5 GeV/c and 8.9 GeV/c. Along the 24 m interaction section beween electrons and antiprotons, the electrons are guided by a solenoid field of 0.2 T with a field straightness of 0.00001 radians rms. To predict the final momentum resolution of the antiproton beam in HESR, electron cooling force calculations, simulations of electron cooling and comparison to experimental data are needed. This paper focuses on the force calculations. The method is based on the theory by Derbenev and Skrinsky, (i.e. the Vlasov techique) and the electron cooling force is numerically calulated using adaptive Monte Carlo integration methods.  
 
THPP055 Stochastic Cooling Developments for the HESR at FAIR target, lattice, luminosity, simulation 3491
 
  • H. Stockhorst, R. Maier, D. Prasuhn, R. Stassen
    FZJ, Jülich
  • T. Katayama
    CNS, Saitama
  • L. Thorndahl
    CERN, Geneva
  The High-Energy Storage Ring (HESR) of the future International Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt will be built as an anti-proton cooler ring in the momentum range from 1.5 to 15 GeV/c. An important and challenging feature of the new facility is the combination of phase space cooled beams with internal targets. In addition to electron cooling transverse and longitudinal stochastic cooling are envisaged to accomplish these goals. A detailed numerical analysis of the Fokker-Planck equation for longitudinal filter cooling including an internal target and intrabeam scattering has been carried out to demonstrate the stochastic cooling capability in the newly designed normal conducting ring lattice of the HESR. Theoretical predictions have been compared to experimental cooling results with internal targets at the COSY facility. Recent developments for the HESR stochastic cooling equipment will be discussed. The design of new high sensitive printed loop couplers and ring slot couplers for the (2-4) GHz range as well as prototype measurements with protons in the COSY accelerator will be presented.  
 
THPP101 Investigation of Lifetime of the Electronics and the Fiber Optics inside the Niche and the Tunnel in the Slow Extraction Area of SIS100 extraction, ion, simulation, optics 3599
 
  • A. B. Plotnikov, E. Mustafin, N. Pyka, P. J. Spiller
    GSI, Darmstadt
  The loss of ions in the slow extraction area of the SIS100 accelerator project at FAIR can be dangerous for the electronic equipment and fiber optics situated inside the tunnel and niches around. During the slow extraction lost ions irradiate the yoke of the quadrupole magnets and collimator and produce a neutrons flux, which can damage or make single event upset at the electronic devices. Also fiber optic cores fade under the action of irradiation. In the current work the investigation of the dose distribution and neutron fluxes, as well as the calculation of the lifetime of the electronics and fiber optics in different places of the tunnel have been done. By using these results the design of the niches and shielding is planned.