Suppression of the eighth-order space-charge-induced resonance

The eighth-order space-charge-induced resonance 8ν_{y}=171 was identified as the source of beam losses and suppressed in the main ring synchrotron of the Japan Proton Accelerator Research Complex. Identification and interpretation were performed using investigations of the lost particles, Poincaré map simulations, and analytical calculations. In addition, the dependencies of the simulated beam loss on the vertical phase advance and resonance potential U[over ^]_{0,8,171} were very similar. Besides validating our assumption, this relationship indicates that the vertical phase advance can be exploited for controlling the beam loss. We, therefore, developed new beam optics by changing the vertical phase advance and successfully reduced the resonance width by a factor of 4. In an experimental study, the new optics reduced the beam loss during the beam injection period by 20% from that of the present optics.

Abstract licence: CC BY

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