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Thorndahl, L.

Paper Title Page
MOA1C02 Stochastic Cooling for the HESR at FAIR 30
 
  • 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 is planned 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. The required beam parameters and intensities are prepared in two operation modes: the high luminosity mode with beam intensities up to 1011 and the high resolution mode with 1010 anti-protons cooled down to a relative momentum spread of only a few 10-5. In addition to electron cooling transverse and longitudinal stochastic cooling are envisaged to accomplish these goals. A detailed numerical and analytical approach to the Fokker- Planck equation for momentum cooling including an internal target has been carried out to demonstrate the stochastic cooling capability. Cooling model predictions are compared with the stochastic cooling performance of the operational cooling system in the cooler synchrotron COSY.  
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THAP13 Recent Developments for the HESR Stochastic Cooling System 191
 
  • R. Stassen, P. B. Brittner, R. Greven, H. Singer, H. Stockhorst
    FZJ, Jülich
  • L. Thorndahl
    CERN, Geneva
  
  Two cooling systems 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: an electron cooler (1.5-8 GeV/c) and a stochastic cooling system from 3.8 GeV/c up to the highest momentum of the HESR (15 GeV/c). Both cooler are mandatory for the operation of the HESR with the PANDA pellet target. The relative low aperture (89mm) of the HESR suggests fixed structures without a plunging system. An octagonal layout was chosen to increase the sensitivity of the electrodes. Two different types of electrodes were built and tested. We will report on the comparison of printed λ/4 loops and new broadband slot couplers.