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@ARTICLE{Reschke:320598,
      author       = {Reschke, D. and Gubarev, Vladimir and Schaffran, J. and
                      Steder, L. and Walker, N. and Wenskat, M. and Monaco, Laura},
      title        = {{P}erformance in the vertical test of the 832 nine-cell
                      1.3 {GH}z cavities for the {E}uropean {X}-ray {F}ree
                      {E}lectron {L}aser},
      journal      = {Physical review accelerators and beams},
      volume       = {20},
      number       = {4},
      issn         = {2469-9888},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {PUBDB-2017-01882},
      pages        = {042004},
      year         = {2017},
      abstract     = {The successful production and associated vertical testing
                      of over 800 superconducting 1.3 GHz accelerating cavities
                      for the European X-ray Free Electron Laser (XFEL) represents
                      the culmination of over 20 years of superconducting
                      radio-frequency $R\&D.$ The cavity production took place at
                      two industrial vendors under the shared responsibility of
                      INFN Milano–LASA and DESY. Average vertical testing rates
                      at DESY exceeded 10 cavities per week, peaking at up to 15
                      cavities per week. The cavities sent for cryomodule assembly
                      at Commissariat à l’énergie atomique (CEA) Saclay
                      achieved an average maximum gradient of approximately
                      33  MV/m, reducing to ∼30  MV/m when the
                      operational specifications on quality factor (Q) and field
                      emission were included (the so-called usable gradient). Only
                      $16\%$ of the cavities required an additional surface
                      retreatment to recover their low performance (usable
                      gradient less than 20  MV/m). These cavities were
                      predominantly limited by excessive field emission for which
                      a simple high pressure water rinse (HPR) was sufficient.
                      Approximately $16\%$ of the cavities also received an
                      additional HPR, e.g. due to vacuum problems before or during
                      the tests or other reasons, but these were not directly
                      related to gradient performance. The in-depth statistical
                      analyses presented in this report have revealed several
                      features of the series produced cavities.},
      cin          = {FLA / MHF-sl / MPY / MKS 4 / INFN},
      ddc          = {530},
      cid          = {I:(DE-H253)FLA-20120731 / I:(DE-H253)MHF-sl-20120731 /
                      I:(DE-H253)MPY-20120731 / $I:(DE-H253)MKS_4-20120731$ /
                      I:(DE-H253)INFN-20120814},
      pnm          = {631 - Accelerator R $\&$ D (POF3-631) / 6G13 - XFEL
                      (POF3-622)},
      pid          = {G:(DE-HGF)POF3-631 / G:(DE-HGF)POF3-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101 /
                      EXP:(DE-H253)FLASH(machine)-20150101 /
                      EXP:(DE-H253)ILC(machine)-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000400244900001},
      doi          = {10.1103/PhysRevAccelBeams.20.042004},
      url          = {https://bib-pubdb1.desy.de/record/320598},
}