A   B   C   D   E   F   H   I   K   L   O   P   Q   R   S   T   V    

sextupole

Paper Title Other Keywords Page
WEAX02 Space charge simulation of J-PARC main ring injection, space-charge, resonance, emittance 177
 
  • A. Y. Molodozhentsev, M. Tomizawa
    KEK, Ibaraki
  The space charge effect in combination with the intrinsic field nonlinearity like the sextupole nonlinearity, used for the chromaticity correction, could lead to significant particle losses in a high beam intensity proton machine. For J-PARC Main Ring (MR) the total particle losses at the ring’s collimator should be less than 1% from the expected maximum beam power of 45kW at the injection energy of 3GeV. To keep the particle losses during the injection process within the required limit it is necessary to optimize the beam parameters from the injector (J-PARC RCS), the collimator aperture of the beam-line from RCS to MR and the collimator aperture of MR. Influence of the structure and non-structure high-order resonances for different working points is discussed. The budget of the beam losses for different MR commissioning scenario is presented.  
 
THBW01 Code benchmarking on induce space charge particle trapping space-charge, emittance, resonance, synchrotron 344
 
  • G. Franchetti, I. Hofmann
    GSI, Darmstadt
  • S. Machida
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  Trapping of particles in a high intensity bunch has been studied by using the MICROMAP. The numerical studies were used to interpret the CERN-PS experiments and explore the underlying beam loss/emittance growth mechanisms. We present in this contributed talk the first attempt of code benchmarking in modeling the long term storage of a high intensity bunch. The code benchmarking is initiated between MICROMAP and SIMPSONS.