Author: Baumgarten, C.
Paper Title Page
WE2PB03 Transverse-Longitudinal Coupling by Space Charge in Cyclotrons 315
  • C. Baumgarten
    PSI, Villigen PSI, Switzerland
  Based on a linear space charge model and on the results of PIC-simulations with OPAL, we analyze the conditions under which space charge forces support bunch compactness in high intensity cyclotrons and/or FFAGs. For this purpose we compare the simulated emittance increase and halo formation for different matched and mismatched particle distributions injected into a separate sector cyclotron with different phase curves.  
slides icon Slides WE2PB03 [3.187 MB]  
TH1PB02 Tuning of the PSI 590 MeV Ring Cyclotron for Accepting and Accelerating a Rebunched 72 MeV Proton Beam 437
  • J.M. Humbel, C. Baumgarten, J. Grillenberger, W. Joho, H. Muller, H. Zhang
    PSI, Villigen PSI, Switzerland
  In the past year the production of a 1.42 MW proton beam at a relative loss level of 10-4 at PSI’s proton facility became routine operation. In addition, the inaugurated buncher based beam injection into the 590 MeV Ringcyclotron made a remarkable step forward. In particular, an almost dispersion free setting of the beamline region around the 500 MHz rebuncher in the 72 MeV transfer line has been established and a perfect matching of the dispersion into the Ringcyclotron has been achieved. This buncher-operation optimized facility setting could be advanced up to the ordinary stable standard 2.2 mA production proton beam. With the buncher voltage turned on, at the moment the beam extracted from the Ringcyclotron is limited to below 1 mA due to raising losses, mainly generated by space charge induced distortions of the beam bunches. For a better understanding of these effects a substantial effort in modelling of the accelerated beam is under way. In particular, the influence of the trim coil fields is being implemented into the OPAL simulation code and the insertion of an additional time structure measurement probe in the Ringcyclotron is proposed.  
slides icon Slides TH1PB02 [9.281 MB]