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@INPROCEEDINGS{Abassi:631512,
      author       = {Abassi, E. and Barbanotti, S. and Bozhko, Y. and Schnautz,
                      T. and Jensch, K. and Penning, J. and Zajac, J.},
      title        = {{H}eat load measurements of {XFEL} cryomodules using helium
                      evaporation method},
      journal      = {IOP conference series / Materials science and engineering},
      volume       = {1327},
      number       = {1},
      issn         = {1757-8981},
      address      = {London [u.a.]},
      publisher    = {Institute of Physics},
      reportid     = {PUBDB-2025-02024},
      pages        = {012011},
      year         = {2025},
      abstract     = {The European XFEL Free Electron Laser (EuXFEL) at DESY is
                      at 2K operation since January 2017. User operation with a
                      maximum beam energy of 17,5 GeV began in September 2017.
                      Studies are ongoing for a possible upgrade to operate XFEL
                      at higher duty factors and lower cavity gradients. For this
                      purpose, dynamic heat loads should be measured precisely to
                      evaluate the cryomodules performances and the needed cooling
                      capacity of refrigeration plant. This paper describes a heat
                      loads measurement method based on measurements of the amount
                      of helium evaporated from LHe II bath during a certain time
                      period. A distinctive feature of this method is its
                      insensitivity to eventual leaks across the seats of
                      JT-valves. Furthermore, possible errors in the LHeII level
                      readings can be minimized using this method. This paper
                      summarizes the experience gained so far with this method at
                      the EuXFEL linac and the CryoModule Test Bench (CMTB).
                      Issues that have arisen during the measurements are
                      discussed and conclusions are drawn. Results of the heat
                      load measurements in CW mode are presented for a single
                      cryomodule at CMTB.},
      month         = {Jul},
      date          = {2024-07-22},
      organization  = {29th International Cryogenic
                       Engineering Conference, International
                       Cryogenic Materials Conference 2024,
                       Geneva (Switzerland), 22 Jul 2024 - 26
                       Jul 2024},
      cin          = {MKS1},
      ddc          = {530},
      cid          = {I:(DE-H253)MKS1-20210408},
      pnm          = {621 - Accelerator Research and Development (POF4-621) /
                      6G13 - Accelerator of European XFEL (POF4-6G13)},
      pid          = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
      doi          = {10.1088/1757-899X/1327/1/012011},
      url          = {https://bib-pubdb1.desy.de/record/631512},
}