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@INPROCEEDINGS{Ayvazyan:307803,
      author       = {Ayvazyan, V. and Clausen, M. and Petersen, Bernd and
                      Putselyk, S. and Schnautz, T.},
      title        = {{RF} {H}eat {L}oad {C}ompensation with {E}lectrical
                      {H}eaters for {XFEL} {A}ccelerator–{M}easurements at
                      {CMTB}, {AMTF} and {FLASH}},
      reportid     = {PUBDB-2016-03382},
      year         = {2015},
      abstract     = {Since 2007, the European X-ray Free Electron Laser (XFEL)
                      is being constructed at DESY, Germany. 800 superconducting
                      niobium 1.3 GHz nine cell cavities and 100 superconducting
                      magnet packages will be operated in a liquid helium II bath
                      at 2K. The static and dynamic heat loads at 2K result in a
                      vapour mass flow up to 96 g/s at 3100 Pa. A four stage cold
                      compressor system is used to return the vapour to the XFEL
                      helium refrigerator. Relative pressure oscillations of the
                      helium II bath should be kept below $1\%$ for stable RF
                      operation of the cavities. In addition, fast changes of
                      vapour pressure and mass flow at the inlet of the cold
                      compressors must be avoided during variation of RF load,
                      e.g. due to switching on/off of RF power or due to cavity
                      quenches. Electrical heaters in the helium II bath of the
                      XFEL linac will be used to compensate the RF load changes.
                      The concept and results of measurements performed at Cryo
                      Module Test Bench (CMTB), Accelerator Module Test Facility
                      (AMTF) and FLASH accelerator are reported.},
      month         = {Jun},
      date          = {2015-06-28},
      organization  = {Cryogenic Engineering Conference and
                       International Cryogenic Materials
                       Conference 2015, Tucson, Arizona (USA),
                       28 Jun 2015 - 2 Jul 2015},
      subtyp        = {Other},
      cin          = {MHFp / MKS2 / MKS1 / MKS},
      cid          = {I:(DE-H253)MHFp-20210408 / I:(DE-H253)MKS2-20210408 /
                      I:(DE-H253)MKS1-20210408 / I:(DE-H253)MKS-20120806},
      pnm          = {6G13 - XFEL (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101 /
                      EXP:(DE-H253)FLASH(machine)-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/307803},
}