• Open Access

Coupling effects of beam-beam interaction and longitudinal impedance

Chuntao Lin, Kazuhito Ohmi, and Yuan Zhang
Phys. Rev. Accel. Beams 25, 011001 – Published 24 January 2022

Abstract

Recent studies have shown a novel coherent head-tail instability induced by beam-beam interaction with a large Piwinski angle. The instability has become an important issue during the designs of CEPC and FCC-ee. Simulations have further revealed that the longitudinal impedance has a strong impact on the beam stability, squeezing the horizontal stable tune area seriously. The cross-wake force has been introduced to represent beam-beam interaction. A mode coupling theory based on the localized wake (impedance) force has been developed to explain the instability. However, the theory did not consider the effects of longitudinal impedance. In this paper, we develop a new transverse mode coupling analysis method that could be used to study the beam-beam instability with and without longitudinal impedance. The result shows that the distortion of longitudinal phase space trajectory and the incoherent synchrotron tune shift induced by longitudinal impedance would reduce the stable tune area.

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  • Received 25 September 2021
  • Accepted 10 January 2022

DOI:https://doi.org/10.1103/PhysRevAccelBeams.25.011001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Accelerators & Beams

Authors & Affiliations

Chuntao Lin1,2, Kazuhito Ohmi3,*, and Yuan Zhang1,2,†

  • 1Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3KEK, Tsukuba, Ibaraki 305-0801, Japan

  • *Corresponding author.ohmi@post.kek.jp
  • Corresponding author.zhangy@ihep.ac.cn

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Issue

Vol. 25, Iss. 1 — January 2022

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