Physical Review Accelerators and Beams (Aug 2019)

Performance analysis of the European X-ray Free Electron Laser 3.9 GHz superconducting cavities

  • M. Bertucci,
  • A. Bignami,
  • A. Bosotti,
  • P. Michelato,
  • L. Monaco,
  • C. Pagani,
  • R. Paparella,
  • D. Sertore,
  • C. Maiano,
  • P. Pierini,
  • J. Chen

DOI
https://doi.org/10.1103/PhysRevAccelBeams.22.082002
Journal volume & issue
Vol. 22, no. 8
p. 082002

Abstract

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The limits of performance of the European XFEL 3.9 GHz superconducting cavities were investigated. Most cavities exhibited high field Q slope, reaching the breakdown field at approximately 22 MV/m. We hypothesize that this limit is a feature of high frequency cavities and can be explained by a thermal model incorporating field dependent surface resistance. The results obtained from simulations were in good agreement with experimental data obtained at 2 K.