A   B   C   D   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   V   W   X   Y   Z  

Kikuchi, T.

Paper Title Page
THAP19 Influences of Space Charge Effect during Ion Accumulation Using Moving Barrier Bucket Cooperated with Beam Cooling 206
 
  • T. Kikuchi, S. Kawata
    Utsunomiya University, Utsunomiya
  • T. Katayama
    GSI, Darmstadt
  
  Space charge effect is important role for stacking of antiprotons and ions in an accumulation ring. The Coulomb force displaces the beam orbits from the designed correct motion. The beam particles kicked out from the ring acceptance by the space charge force are lost. The space charge effect interfere the beam stacking, and the number of the accumulated beam decreases and the emittance is increased. The longitudinal ion storage method by using a moving barrier bucket system with a beam cooling can accumulate the large number of secondary generated beams*. After the multicycle injections of the beam bunch, the stored particles are kicked by the space charge effect of the accumulated beam. Using numerical simulations, we employ the longitudinal particle tracking, which takes into account the barrier bucket voltage, the beam cooling and the space charge effect, for the study of the beam dynamics during the accumulation operations.

*T. Katayama, P. Beller, B. Franzke, I. Nesmiyan, F. Nolden, M. Steck, D. Mohl and T. Kikuchi, AIP Conference Proc. 821 (2005) 196.

 
FRM2C05 Simulation Study of Beam Accumulation with Moving Barrier Buckets and Electron Cooling 238
 
  • T. Katayama, C. Dimopoulou, B. Franzke, M. Steck
    GSI, Darmstadt
  • T. Kikuchi
    Utsunomiya University, Utsunomiya
  • D. Möhl
    CERN, Geneva
  
  An effective ion beam accumulation method in NESR at FAIR project, is investigated with numerical way. The princile of accumulation method is as follows: Ion beam bunch from the collector ring or synchrotron is injected in the longitudinal gap space prepared by moving barrier voltage in NESR. Injected beam becomes instantly coasting beam after switching off the barrier voltage and is migrated with the previously stacked beam. After the momentum spread is well cooled by electron cooling, the barrier voltage is switched on and moved to prepare the empty gap space for the next injection. This process is repeated say 20 times to attain the required intensity. We have investigated this stacking process numerically, including the Intra Beam Scattering effect which might limit the stacking current in the ring. Detailed simulated results will be presented for the NESR case as well as the ESR experimental parameters.  
slides icon Slides