ORBIT BEAM SIMULATION PROGRESS IN THE 3-GeV RAPID CYCLING SYNCHROTRON OF J-PARC

摘要

We have made a significant progress with ORBIT 3-D particle tracking code for numerous beam simulations in the 3-GeV Rapid Cycling Synchrotron (RCS) of Japan Proton Accelerator Research Complex. Namely, for a single particle dynamics, MAD lattice and the corresponding ORBIT TEAPOT model have been made to give exactly same results to that with SAD model used for the RCS beam commissioning. The time dependent lattice functions of the injection chicane bump magnets and similar other time dependent lattice imperfections, which are already found to cause significant beam losses in the real machine have been successfully introduced. Recently, time dependent transverse and longitudinal impedances of the extraction kicker magnets have also been introduced. As a result, the ORBIT code should proved to be much more matured for beam simulations in synchrotrons. Beam simulation results illustrating these new realistic features are presented.