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Description
The longitudinal localized excitation slow extraction method reduces the energy spread of the extracted beam by applying transverse excitation exclusively within specific phase intervals at the edges of the longitudinal phase space of the bunch. For localized square-wave excitation, conventional amplitude modulation formula struggles to achieve uniform beam spill, while the temporal uniformity of the extracted beam is crucial in radiotherapy and related physics experiments.
The XiPAF-Upgrading Synchrotron (with a circumference of 39.96 m), developed from Xi’an 200 MeV Proton Application Facility, serves as a dedicated platform for the study and evaluation of single-event effects on core electronics for astronautics. We simulated the localized square-wave excitation slow extraction process using the SynTrack particle tracking code based on the XiPAF-Upgrading Synchrotron's parameters to extract low energy spread beam. Furthermore, a Bayesian optimization method was employed to refine the amplitude modulation curve of the excitation signa, thereby achieving highly uniform beam spill under low-energy slow extraction conditions.
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