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https://doi.org/10.18429/JACoW-SAP2023-MOCXA02
Title Beam-Beam Interaction with Longitudinal Impedance and Its Application in TMCI Study
Authors
  • C.T. Lin
    IASF, Shenzhen, Guangdong, People’s Republic of China
  • K. Ohmi
    KEK, Ibaraki, Japan
  • Y. Zhang
    IHEP, Beijing, People’s Republic of China
Abstract Simulations have showed a novel coherent head-tail instability induced by beam-beam interaction with a large Piwinski angle. The localized cross-wake force has been introduced to explain the instability. The longitudinal impedance would cause coherent and incoherent synchrotron tune shift and distort the particle¿s trajectories in longitudinal phase space. Further beam-beam simulation revealed that the longitudinal impedance has strong impacts on the beam stability, squeezing the horizontal stable tune area seriously. The instability has become an important issue during the designs of CEPC and FCC-ee. In this paper, we develop a transverse mode coupling analysis method that could be used to study beam-beam instability with and without longitudinal impedance. This method can also be applied in synchrotron light sources to study transverse mode coupling instability (TMCI) with longitudinal impedance and harmonic cavity. Some preliminary results at Shenzhen Innovation Light Source (SILF) are also shown.
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Conference SAP2023
Series Symposium on Accelerator Physics (14th)
Location Xichang, China
Date 10-12 July 2023
Publisher JACoW Publishing, Geneva, Switzerland
Editorial Board Volker RW Schaa (GSI, Darmstadt, Germany); Wenhui Huang (TUB, Beijing, China); Xueqing Yan (PKU, Beijing, China); Chuanxiang Tang (TUB, Beijing, China); Lu Li (IMP, Lanzhou, China)
Online ISBN 978-3-95450-265-3
Received 30 June 2023
Accepted 11 July 2023
Issued 23 September 2024
DOI doi:10.18429/JACoW-SAP2023-MOCXA02
Pages 1-3
Copyright
Creative Commons CC logoPublished by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 International license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.