含高次谐波腔的HLS II RF系统高阶模驱动不稳定性的解析模拟
Analytic modeling of instabilities driven by higher-order modes in HLS II RF system with a higher-harmonic cavity
摘要：
在合肥光源二期工程中，无源四次谐波谐振腔的使用对抑制电子储存环中的束流纵向不稳定性起到了关键作用，使束流长度增加了2.6倍。同时，由高阶模（HOM）驱动的不稳定性可能会限制高次谐波腔的性能。本文对窄带寄生模驱动的寄生耦合聚束不稳定性和宽带HOM驱动的微波不稳定性进行了解析建模。分析模型的结果与我们以前的模拟研究是一致的，表明无源四次谐波腔抑制寄生耦合聚束不稳定性和微波不稳定性。模型表明，四次谐波腔可能会成功地用于在合肥光源II。
英文摘要：
The utility of a passive fourth-harmonic cavity plays key role in suppressing longitudinal beam instabilities in the electron storage ring and lengthens the bunch by a factor of 2.6 for the phase II project of Hefei Light Source(HLS II). Meanwhile, instabilities driven by higher-order modes(HOM) may limit the performance of the higher-harmonic cavity. In this paper, the parasitic coupled-bunch instability which is driven by narrow band parasitic modes and the microwave instability which is driven by broadband HOM are both modeled analytically. The analytic modeling results are in good agreement with that of our previous simulation study and indicate that the passive fourth-harmonic cavity suppresses parasitic coupled-bunch instabilities and the microwave instability. The modeling suggests that a fourth-harmonic cavity may be successfully used at HLS II.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
