Instabilities driven by higher-order modes in a radio frequency system with a passive higher-harmonic cavity
Instabilities driven by higher-order modes in a radio frequency system with a passive higher-harmonic cavity
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DOI：
10.1103/physrevstab.8.084401
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发表时间：
2005-08
影响因子：
--
通讯作者：
R. Bosch
中科院分区：
文献类型：
--
作者：
R. Bosch
本文对电子存储环中高阶模对纵束稳定性的影响进行了分析和模拟。考虑了Aladdin和MAX-II电子存储环的窄带寄生模式和宽带阻抗。仿真结果证实了无源谐振腔对寄生耦合束不稳定性的抑制作用，与解析模型一致。在束长超过真空管半径的长束区，解析模型和仿真结果表明，谐振腔对微波不稳定性也有抑制作用。在束长小于真空管半径的短束区，解析模型和仿真结果表明，谐振腔中的调谐可能会加剧微波的不稳定性。
1098-4402= The effect of a higher-order mode upon longitudinal beam stability in an electron storage ring is modeled analytically and with simulations. Narrow band parasitic modes and broadband impedance are considered for the Aladdin and MAX-II electron storage rings. The simulations confirm that a passive harmonic cavity strongly suppresses parasitic coupled-bunch instabilities, in agreement with the analytic model. In the long-bunch regime where the bunch length exceeds the vacuum pipe radius, analytic modeling and simulations indicate that a harmonic cavity also suppresses the microwave instability. In the short-bunch regime where the bunch length is smaller than the vacuum pipe radius, analytic modeling and simulations indicate that tuning in a harmonic cavity may worsen the microwave instability.