Author: Wang, Q.Y.
Paper Title Page
Development and Vertical Tests of a 166.6-MHz Proof-of-Principle Superconduting β = 1 Quarter-Wave Cavity for HEPS  
  • P. Zhang, J. Dai, L. Guo, T.M. Huang, Z.Q. Li, H.Y. Lin, Q. Ma, F. Meng, Z.H. Mi, Q.Y. Wang, X.Y. Zhang
    IHEP, Beijing, People’s Republic of China
  Funding: This work was supported by the High Energy Photon Source - Test Facility (HEPS-TF) project, HEPS project and Chinese Academy of Sciences.
Low-frequency superconducting cavities are needed in main accelerators for storage ring light sources with ultralow emittance. Therefore, a compact 166.6-MHz superconducting proof-of-principle cavity was designed for the High Energy Photon Source (HEPS) in China by adopting a quarter-wave geometry with β=1*. The cavity is compact in size yet possessing a low resonant frequency. The nearest higher order mode is significantly separated from the fundamental mode, making the cavity attractive for high-current accelerators such as HEPS. The achieved accelerating voltage of 3.0 MV is well beyond the designed 1.5 MV and high surface electromagnetic fields were reached with excellent RF and mechanical performances. Multipacting barriers were easily processed. This constitutes the first demonstration of a compact low-frequency β=1 superconducting cavity for HEPS. The design, fabrication, surface preparation, and cryogenic tests of the cavity will be presented.
* P. Zhang, et al., Review of Scientific Instruments 90, 084705 (2019).
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