Higher Order Mode Damping for 166 MHz and 500 MHz Superconducting RF Cavities at High Energy Photon Source

Zheng, Hongjuan; Li, Zhongquan; Meng, Fanbo; Wang, Na; Xu, Haisheng; Zhang, Pei; Zhang, Xinying

doi:10.18429/JACoW-IPAC2021-WEPAB090

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BiBTeX citation export for WEPAB090: Higher Order Mode Damping for 166 MHz and 500 MHz Superconducting RF Cavities at High Energy Photon Source

@inproceedings{zheng:ipac2021-wepab090,
  author       = {H.J. Zheng and Z.Q. Li and F. Meng and N. Wang and H.S. Xu and P. Zhang and X.Y. Zhang},
% author       = {H.J. Zheng and Z.Q. Li and F. Meng and N. Wang and H.S. Xu and P. Zhang and others},
% author       = {H.J. Zheng and others},
  title        = {{Higher Order Mode Damping for 166 MHz and 500 MHz Superconducting RF Cavities at High Energy Photon Source}},
  booktitle    = {Proc. IPAC'21},
  pages        = {2798--2801},
  eid          = {WEPAB090},
  language     = {english},
  keywords     = {cavity, HOM, impedance, damping, storage-ring},
  venue        = {Campinas, SP, Brazil},
  series       = {International Particle Accelerator Conference},
  number       = {12},
  publisher    = {JACoW Publishing, Geneva, Switzerland},
  month        = {08},
  year         = {2021},
  issn         = {2673-5490},
  isbn         = {978-3-95450-214-1},
  doi          = {10.18429/JACoW-IPAC2021-WEPAB090},
  url          = {https://jacow.org/ipac2021/papers/wepab090.pdf},
  note         = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB090},
  abstract     = {{Superconducting rf cavities have been chosen for High Energy Photon Source, a 6 GeV diffraction-limited synchrotron light source under construction in Beijing. The main accelerating cavity adopted a quarter-wave β=1 structure operating at 166 MHz while the third harmonic cavity utilized the single-cell elliptical geometry at 500 MHz for the storage ring. The high beam current (200 mA) requires a strong damping of higher order modes (HOMs) excited in the superconducting cavities. To meet the beam stability requirements, enlarged beam pipes with a diameter of 505 mm for the 166 MHz cavity and 300 mm for the 500 MHz cavity were chosen to allow all HOMs to propagate along the beam tubes and to be damped by beam-line absorbers. This paper presents the HOM damping scheme and the cavity impedance analysis results. In addition, power losses due to HOMs were also evaluated for various operation modes (high charge and high luminosity) of the HEPS.}},
}