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

The eighth-order space-charge-induced resonance8νy=171was 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 si...

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Bibliographic Details
Published in:Physical review. Accelerators and beams 2022-12, Vol.25 (12), p.121001, Article 121001
Main Authors: Yasui, Takaaki, Kurimoto, Yoshinori
Format: Article
Language:English
Subjects:
Beam injection
Poincare maps
Proton accelerators
Resonance
Synchrotrons
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Summary:The eighth-order space-charge-induced resonance8νy=171was 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 potentialU^0,8,171were 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.
ISSN:2469-9888
2469-9888
DOI:10.1103/PhysRevAccelBeams.25.121001