Transverse Mode-Coupling Instability with Longitudinal Impedance

分类： 核科学技术 >> 辐射物理与技术 提交时间： 2024-04-30

Xu, Haisheng Lin, Chuntao Wang, Na Xu, Jingye Zhang, Yuan

摘要： Transverse mode-coupling instability (TMCI) is a dangerous transverse single-bunch instability that can leadto severe particle loss. The mechanism of TMCI can be explained by the coupling of transverse coherentoscillation modes owing to the transverse short-range wakefield (i.e., the transverse broadband impedance).Recent studies on future circular colliders, e.g., FCC-ee, showed that the threshold of TMCI decreased significantlywhen longitudinal and transverse impedances were included. We performed computations for a circularelectron-positron collider (CEPC) and observed a similar phenomenon. Systematic studies on the influence oflongitudinal impedance on the TMCI threshold were conducted. We concluded that the imaginary part of thelongitudinal impedance, which caused a reduction in the incoherent synchrotron tune, was the primary reasonfor the reduction in the TMCI threshold. Additionally, the real part of the longitudinal impedance assists inincreasing the TMCI threshold.

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