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Impact of coherent wiggler radiation impedance in Tau-Charm factories

Tianlong He1,*, Ye Zou2,†, Demin Zhou3,4,‡, Hao Zhou2, Hangzhou Li1, Linhao Zhang2, Tao Liu2, Weiwei Li1, and Jingyu Tang1,2

  • *Contact author: htlong@ustc.edu.cn
  • †Contact author: zouye@ustc.edu.cn
  • ‡Contact author: dmzhou@post.kek.jp
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Phys. Rev. Accel. Beams 28, 101002 – Published 27 October, 2025

DOI: https://doi.org/10.1103/yqdj-r617

Abstract

Coherent synchrotron radiation (CSR) has long been recognized as a significant source of longitudinal impedance driving microwave instability in electron storage rings. In the pursuit of higher luminosity, next-generation circular e+e− colliders operating in the few-GeV energy range, such as B-factories and Tau-Charm factories, are being designed with low-emittance beams and high beam currents. Damping wigglers are commonly introduced to reduce damping times and control beam emittance. In this study, we systematically investigate the impact of coherent wiggler radiation (CWR), a specific form of CSR generated within wigglers, on beam stability in Tau-Charm factories. We revisit the threshold conditions for CWR-induced microwave instability and evaluate its effects under realistic lattice configurations of collider rings. Furthermore, we examine theoretical models of longitudinal CWR impedance and identify improved formulations that better capture its influence. As an illustrative example, the developed CWR impedance models are applied to simulate beam stability in the Super Tau-Charm Facility currently under design in China.

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References (30)

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Phys. Rev. Accel. Beams 28, 101002– Published 27 October, 2025
  • Received 30 July 2025
  • Accepted 10 October 2025
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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.

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