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Novel bimodal radiofrequency cavity enabling independent operation and effective higher-order mode damping for high-brightness particle beams

Junyu Zhu* and Xiao Li†

Jiebing Yu, Zhijun Lu, Xuerui Hao, Bin Wu, Chunlin Zhang, Wei Long, Yang Liu, Shengyi Chen, Shenghua Liu et al.

Jian Wu and Xiang Li

  • *Contact author: zhujy@ihep.ac.cn
  • †Contact author: lixiao@ihep.ac.cn
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Phys. Rev. Accel. Beams 28, 082001 – Published 4 August, 2025

DOI: https://doi.org/10.1103/zc4l-k84r

Abstract

Developing multifrequency acceleration systems is crucial for optimizing beam dynamics in high-brightness particle beams, particularly for minimizing energy spread, manipulating bunch length, and facilitating beam bunching. This paper introduces a novel bimodal radio frequency (rf) cavity design that integrates both fundamental and harmonic modes within a single structure, offering enhanced spatial efficiency and improved operational flexibility for multifrequency rf systems. Unlike traditional designs, our cavity enables independent and simultaneous operation of each mode, along with effective suppression of higher-order modes (HOMs), which is critical for high-current beam stability. This breakthrough addresses significant challenges in bimodal cavity technology, such as intermode tuning coupling, rf-driving coupling, and effective HOM damping, providing essential solutions for high-current beam applications. Our work opens new research avenues in advanced rf cavity design, with significant implications for the future of high-brightness beam technologies, including advanced accelerator designs and improved beam quality.

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Phys. Rev. Accel. Beams 28, 082001– Published 4 August, 2025
  • Received 16 January 2025
  • Accepted 26 June 2025
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