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An, S.

Paper Title Page
WPAT086 Superconducting RF Cavity Frequency and Field Distribution Sensitivity Simulation 4194
 
  • S. An
    ORNL, Oak Ridge, Tennessee
  
  Funding: Under contract DE-AC05-00OR22725 for the U.S. Department of Energy.

Frequency and electromagnetic field distribution sensitivity of a superconducting RF (SRF) cavity due to cavity’s small deformation are the fundamental phyical paramethers in cavity and tuner design. At low temperature, the frequency sensitivity can be obtained by measuring prototype cavity, but it is not easy to test the filed distribution sensitivity. This paper presents and describes a simulation method combining ANSYS and SUPERFISH to calculate the cavity frequency and field distribution variation due to cavity’s small deformation caused by mechanical force, radiation force, thermal expansion etc.. As an example, the simulation results of the frequency and field flatness sensitivity on the SNS cavities were confirmed by their test results.

sun_ancn@yahoo.com

 
FPAE001 Design Work for the High-Energy Storage Ring for Antiprotons of the Future GSI Project 776
 
  • A. Lehrach, S. An, K. Bongardt, J. Dietrich, R. Eichhorn, B. Lorentz, R. Maier, S. Martin, D. Prasuhn, Y. Senichev, E.A. Senicheva, H. Stockhorst, R. Tölle, E. Zaplatin
    FZJ, Jülich
  • O. Boine-Frankenheim, A. Dolinskii, M. Steck
    GSI, Darmstadt
  • B. Gålnander, D. Reistad
    TSL, Uppsala
  • F.H. Hinterberger
    Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik,, Bonn
  
  The High-Energy Storage Ring (HESR) of the future international Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt is planned as an antiproton cooler and storage ring in the momentum range from 1.5 to 15 GeV/c. The design work for the HESR is organized by a consortium with scientists from FZ Jülich, GSI Darmstadt and TSL Uppsala. An important feature of the new facility is the combination of phase space cooled beams with internal targets, resulting in demanding beam parameter in two operation modes: high luminosity mode with beam intensities up to few times 1011, and high resolution mode with a momentum spread down to 10-5, respectively. To reach these beam parameters very powerful phase space cooling is needed, utilizing high-energy electron cooling and high-bandwidth stochastic cooling. In this paper an overview of the design work is given, focusing on recent developments and planned R&D work.