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@INPROCEEDINGS{Paetzold:398358,
      author       = {Paetzold, Torsten and Petersen, Bernd and Schnautz, Tobias
                      and Ueresin, Can and Zajac, Juliusz},
      title        = {{F}irst {O}peration of the {XFEL} {L}inac with the 2 {K}
                      {C}ryogenic {S}ystem},
      reportid     = {PUBDB-2017-13933},
      pages        = {8},
      year         = {2017},
      abstract     = {The RF operation of the about 800 superconducting 1.3 GHz
                      9-cell cavities of the XFEL linac requires helium II bath
                      cooling at 2 K, corresponding to a vapor pressure of 3100
                      Pa. After the first cool-down of the XFEL linac to 4 K in
                      December, 27th 2016 the operation of the 2 K cryogenic
                      system was started in January, 2nd 2017. The 2 K cryogenic
                      system consist of a 4-stage set of cold compressors to
                      compress helium vapor at a mass flow of up to 100 g/s from
                      2400 Pa to about 110 kPa and a full flow bypass with an
                      arrangement of heat exchangers and control valves. This
                      paper describes the XFEL refrigerating plant, especially the
                      2 K cryogenic system, thetuning of the cold compressor
                      regulation to adapt to the XFEL linac static and dynamicheat
                      loads and experience of about 6 months of operation.},
      month         = {Jul},
      date          = {2017-07-09},
      organization  = {2017 Cryogenic Engineering Conference
                       and International Cryogenic Materials
                       Conference, Madison (USA), 9 Jul 2017 -
                       13 Jul 2017},
      cin          = {MKS},
      cid          = {I:(DE-H253)MKS-20120806},
      pnm          = {6G13 - XFEL (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)8},
      doi          = {10.3204/PUBDB-2017-13933},
      url          = {https://bib-pubdb1.desy.de/record/398358},
}