Design Optimization of the 166-MHz and 500-MHz Fundamental Power Couplers for Superconducting RF Cavities at High Energy Photon Source

Huang, Tong-Ming; Chang, Zhengze; Guo, Lin; Lin, Haiying; Ma, Qiang; Pan, Weimin; Zhang, Pei; Zhang, Xinying

doi:10.18429/JACoW-SRF2021-WEPFAV005

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BiBTeX citation export for WEPFAV005: Design Optimization of the 166-MHz and 500-MHz Fundamental Power Couplers for Superconducting RF Cavities at High Energy Photon Source

@inproceedings{huang:srf2021-wepfav005,
  author       = {T.M. Huang and Z.Z. Chang and L. Guo and H.Y. Lin and Q. Ma and W.M. Pan and P. Zhang and X.Y. Zhang},
% author       = {T.M. Huang and Z.Z. Chang and L. Guo and H.Y. Lin and Q. Ma and W.M. Pan and others},
% author       = {T.M. Huang and others},
  title        = {{Design Optimization of the 166-MHz and 500-MHz Fundamental Power Couplers for Superconducting RF Cavities at High Energy Photon Source}},
  booktitle    = {Proc. SRF'21},
% booktitle    = {Proc. 20th International Conference on RF Superconductivity (SRF'21)},
  pages        = {544--548},
  eid          = {WEPFAV005},
  language     = {english},
  keywords     = {cavity, multipactoring, simulation, cryogenics, photon},
  venue        = {East Lansing, MI, USA},
  series       = {International Conference on RF Superconductivity},
  number       = {20},
  publisher    = {JACoW Publishing, Geneva, Switzerland},
  month        = {10},
  year         = {2022},
  issn         = {2673-5504},
  isbn         = {978-3-95450-233-2},
  doi          = {10.18429/JACoW-SRF2021-WEPFAV005},
  url          = {https://jacow.org/srf2021/papers/wepfav005.pdf},
  abstract     = {{Five 166-MHz quarter-wave ß=1 cavities have been chosen for the fundamental srf system while two 500-MHz single-cell elliptical cavities for the third-harmonic system for High Energy Photon Source (HEPS). Each cavity will be equipped with one fundamental power coupler (FPC) capable of delivering 250-kW continuous-wave rf power. For the 166-MHz FPC, two prototypes were developed and excellent performances were demonstrated in the high-power operations. However, the inner air part was observed to be warmer than predictions. Therefore, an innovative cooling scheme was adopted. In addition, the Nb extension tube has been elongated to solve the overheating in the cavity-coupler interface region. Concerning the 500-MHz FPC, several improvements were proposed. First, a doorknob adopting WR1800 instead of WR1500 waveguide was chosen to better match the operating frequency; Second, the window position was optimized to ensure multipacting-free on the window; Third, the cryogenic heat load was estimated carefully to obtain an optimum helium gas cooling. The main parameters and the design optimizations of the 166-MHz and 500-MHz FPCs are presented in this paper.}},
}