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@ARTICLE{Singer:317045,
      author       = {Singer, W. and Brinkmann, A. and Brinkmann, R. and Iversen,
                      J. and Matheisen, A. and Moeller, W. D. and Navitski, A. and
                      Reschke, D. and Schaffran, J. and Sulimov, A. and Walker, N.
                      and Weise, H. and Michelato, P. and Monaco, L. and Pagani,
                      C. and Wiencek, M.},
      title        = {{P}roduction of {S}uperconducting 1.3-{GH}z {C}avities for
                      the {E}uropean {X}-{R}ay {F}ree {E}lectron {L}aser},
      journal      = {Physical review accelerators and beams},
      volume       = {19},
      number       = {9},
      issn         = {2469-9888},
      address      = {College Park, MD},
      publisher    = {American Physical Society},
      reportid     = {PUBDB-2017-00386},
      pages        = {092001},
      year         = {2016},
      abstract     = {The production of over 800 1.3-GHz superconducting (SC)
                      cavities for the European X-ray Free Electron Laser (EXFEL),
                      the largest in the history of cavity fabrication, has now
                      been successfully completed. In the past, manufacturing of
                      SC resonators was only partly industrialized; the main
                      challenge for the EXFEL production was transferring the
                      high-performance surface treatment to industry. The
                      production was shared by the two companies RI Research
                      Instruments GmbH (RI) and Ettore Zanon S.p.A. (EZ) on the
                      principle of “build to print”. DESY provided the
                      high-purity niobium and NbTi for the resonators. Conformity
                      with the European Pressure Equipment Directive (PED) was
                      developed together with the contracted notified body TUEV
                      NORD. New or upgraded infrastructure has been established at
                      both companies. Series production and delivery of
                      fully-equipped cavities ready for cold rf testing was
                      started in December 2012, and finished in December 2015.
                      More than half the cavities delivered to DESY as specified
                      (referred to “as received”) fulfilled the EXFEL
                      specification. Further improvement of low-performing
                      cavities was achieved by supplementary surface treatment at
                      DESY or at the companies. The final achieved average
                      gradient exceeded the EXFEL specification by approximately
                      $25\%.$ In the following paper, experience with the 1.3-GHz
                      cavity production for EXFEL is reported and the main lessons
                      learned are discussed.},
      cin          = {MPL / MHF-sl / DIR / MKS / FLA / MPY},
      ddc          = {530},
      cid          = {I:(DE-H253)MPL-20120731 / I:(DE-H253)MHF-sl-20120731 /
                      I:(DE-H253)DIR-20120806 / I:(DE-H253)MKS-20120806 /
                      I:(DE-H253)FLA-20120731 / I:(DE-H253)MPY-20120731},
      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},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000383252000002},
      doi          = {10.1103/PhysRevAccelBeams.19.092001},
      url          = {https://bib-pubdb1.desy.de/record/317045},
}