Speaker
Description
Third order resonances of 3νx=64 and νx+2νy=64 have been corrected for the high intensity operation of the main ring (MR) of the Japan Proton Accelerator Research Complex (J-PARC). The cause of the third order resonances would be error magnetic fields of the sextupole components. The resonances are corrected using the trim coils of the sextupole magnets and the beam loss in the operation are then significantly reduced. We have performed multi-particle tracking simulations with the space charge effect for further reduction of beam losses. It has been observed that the resonance correction for both on-momentum and off-momentum particles are important. A procedure has been established for the resonance correction for a certain range of momentum deviation. We are able to achieve further beam loss reduction with the consideration of the beam optics modulated by the space charge effect in the procedure.