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COSY

Paper Title Other Keywords Page
MOPCH084 From COSY to HESR target, electron, proton, antiproton 226
 
  • D. Prasuhn, J. Dietrich, A. Lehrach, B. Lorentz, R. Maier, H. Stockhorst
    FZJ, Jülich
  The High Energy Storage Ring (HESR) at the proposed Facility for Antiproton and Ion Research (FAIR) puts strong demands on quality and intensity of the stored antiproton beam in the presence of thick internal targets. The existing synchrotron and storage ring COSY in Juelich can be seen as a smaller model of the HESR. In this paper we will discuss possible benchmarking experiments at COSY, involving effects like beam cooling, target heating, intra-beam scattering, etc. The aim of these experiments is to support the design work for the HESR and ensure that the specified beam conditions can be achieved.  
 
MOPCH085 Pickup Structures for the HESR Stochastic Cooling System pick-up, vacuum, kicker, ion 228
 
  • R. Stassen, P.B. Brittner, G. Schug, H.S. Singer
    FZJ, Jülich
  The design of the High-Energy Storage Ring (HESR) of the future International Facility for Antiproton and Ion Research (FAIR) at the GSI in Darmstadt includes electron and stochastic cooling. Simulations have shown that the bandwidth of a 2-4 GHz stochastic cooling system is sufficient to achieve the requested beam parameter at the internal target. New 2-4 GHz pickup structures have been developed and tested. First results of the low impedance, printed loop structures will be presented.  
 
MOPCH186 First Cool Down of the Juelich Accelerator Module Based on Superconducting Half-Wave Resonators vacuum, radiation, shielding, instrumentation 496
 
  • F.M. Esser, B. Laatsch, H.S. Singer, R. Stassen
    FZJ, Jülich
  • R. Eichhorn
    TU Darmstadt, Darmstadt
  In the context of upgrading the existing proton and deuteron accelerator facility COSY at the Forschungszentrum Juelich, an accelerator module based on superconducting half wave resonators is prototyped. Due to beam dynamics, the requirements of cavity operation and a top-loading design for mounting, the cryostat had to be designed very compact and with a separate vacuum system for beam and insulation vacuum. These restricted requirements lead to very short cold-warm transitions in beam port region and to an unconventional design regarding to the shape of the cryostat vessel. This paper will review the design constraints, gives an overview of the ancillary parts of the module (cavities, tuner, etc.) and will present the results of the first cool-down experiments. Furthermore the future work will be presented.  
 
MOPLS018 High-order Effects and Modeling of the Tevatron collider, damping, simulation, lattice 577
 
  • P. Snopok, M. Berz
    MSU, East Lansing, Michigan
  • C. Johnstone
    Fermilab, Batavia, Illinois
  The role and degree of nonlinear contributions to machine performance is a controversial topic in current collider operations and in the design of future colliders. A high-order model has been developed of the Tevatron in COSY, which includes the strongest sources of nonlinearities. Signatures of nonlinear behavior are studied and compared with performance data. The observed nonlinear effects are compared before and after implemention of nonlinear correction schemes.  
 
TUPLS080 The Proposed 2 MeV Electron Cooler for COSY-Juelich electron, acceleration, gun, target 1684
 
  • J. Dietrich
    FZJ, Jülich
  • V.V. Parkhomchuk
    BINP SB RAS, Novosibirsk
  The design, construction and installation of a 2 MeV electron cooling system for COSY-Juelich is proposed to further boost the luminosity even with strong heating effects of high-density internal targets. In addition the design of the 2 MeV electron cooler for COSY is intended to test some new features of the high energy electron cooler for HESR at FAIR/GSI. The design of the 2 MeV electron cooler will be accomplished in cooperation with the Budker Institute of Nuclear Physics in Novosibirsk, Russia. Starting with the boundary conditions of the existing electron cooler at COSY the requirements and a first general scheme of the 2 MeV electron cooler are described.  
 
TUPLS087 Recent Gains in Polarized Beam Intensities for the Cooler Synchrotron COSY at Jülich ion, cyclotron, synchrotron, ion-source 1705
 
  • R. Gebel, O. Felden, R. Maier, P. von Rossen
    FZJ, Jülich
  Since January 1996, the cyclotron JULIC operates as the injector of H(-) or D(-) beams for the cooler synchrotron COSY at the IKP of the Forschungszentrum Juelich. Routinely about 8 microA of unpolarized or 1 microA of pola­rized H(-) ions are delivered for charge-exchange injection into COSY. A polarization in excess of 90 % was measured for protons inside the synchrotron COSY. Additionally, polarized and unpolarized D(-) ions have been delivered to experiments. A sequence of up to eight different polarization states for deuterons has been provided for experiments. By advancing the components of the polarized ion the number of polarized particles for injection into the cyclotron has been increased by a factor of three to 5,5x1012 protons, delivered in a 20 ms pulse with a repetition rate of 2 seconds. This report sums up the charac­teristics of the ion sources and the cyclotron in their present mode of opera­tion and de­scribes the achievements towards higher beam intensities as well as for providing unpolarized and polarized H(-) and D(-) beams with high reliability.  
 
WEPCH067 Implementation of TPSA in the Mathematica Code LieMath lattice, sextupole, octupole, linear-collider 2077
 
  • D. Kaltchev
    TRIUMF, Vancouver
  The Lie Algebra package LieMath written in the Mathematica language constructs the beamline map in a single-exponent Lie generator form. The algorithm (BCH-based map concatenation) has been recently enhanced with Truncated Power Series Algebra (TPSA) techniques.The polynomials produced by the series expansion of the Hamiltonian are replaced with arrays of coefficients (derivative structures) and the Poisson bracket and BCH are defined as operations on such structures. We have confirmed the statement that using automatic differentiation instead of symbolic operations increases the speed by least an order of magnitude. The code is equipped with a MAD parser and a normal form block allowing it to extract nonlinear chromaticity and amplitude detuning. The notebook was applied in FFAG studies and may be useful for the linear collider final focus or collimation systems.