New space-charge methods in Accsim and their application to injection in the CERN PS Booster

The tracking and simulation code Accsim has recently been upgraded with new treatments of transverse space charge, one based on a conventional multiple-Fourier-transform technique and another using a new hybrid-fast-multipole (HFM) method. We present the application of the code to the study of multiturn injection in the CERN PS Booster in its LHC-injector-chain operation scenario. In particular, the ability of the HFM method to accurately model the turn-by-turn stacking and subsequent development of the beam is evaluated, especially its development near the sharp cutoff produced by beam loss on the injection septum. Results are compared with measured injection efficiencies and betatron amplitude distributions. (6 refs) .