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Development of a Beam Dynamic Design Code for Proton Travelling Wave Linacs

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摘要:  The field of proton accelerators research is experiencing a surge of interest as proton beams find wide applications in areas like cancer therapy, industrial applications, and scientific researches. The recent advancements in high gradient radio frequency standing wave and travelling wave ion accelerating structures, reaching frequencies of several GHz in the past few years, have paved the way for compact linear ion accelerators with high gradients. Compared with the abundant design code for standing wave ion linacs, the design code for travelling wave structure is very limited. We developed a new type of particle dynamics tracking (PDT) code, which can be used in beam dynamics design for both standing wave and travelling wave structures based on the electromagnetic field distribution of the unit cell. The benchmark with the widely used commercial linac beam dynamics simulation code TraceWin shows its accuracies both in energy gain and envelopes are good. The code has been applied in the beam dynamics design of a low current backward travelling wave proton linac, which operates at RF frequency of 2.856 GHz and working at 5π/6 mode. The linac spans a total length of approximately 3 m, comprising 10 tanks and 10 PMQs (Permanent Magnet Quadrupoles). It operates with a 30 MV/m accelerating gradient, characterized by full transmission and minimal emittance growth.

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[V1] 2023-12-05 22:13:13 ChinaXiv:202312.00081V1 下载全文
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