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@INPROCEEDINGS{Barbanotti:639324,
      author       = {Barbanotti, Serena and Walker, Nicholas John and Branlard,
                      Julien and Steder, Lea and Reschke, Detlef and Jensch, Kay
                      and Schnautz, Tobias and Weise, Hans and Kostin, Denis},
      title        = {{THE} {PATH} {TO} {HIGH} {DUTY} {CYCLE} {AT}
                      {E}u{XFEL}:{CRYOMODULE} {DEVELOPMENTS}},
      reportid     = {PUBDB-2025-04425},
      year         = {2025},
      abstract     = {The European XFEL is in operation since 2017 with a maximum
                      energy of 17.5 GeV in short-pulse (SP) mode, consisting of
                      0.65-ms long bunch trains at 10 Hz repetition rate. The
                      accelerator can deliver up to 2700 electron bunches every
                      100 ms, with a spacing between bunches of 220 ns.After eight
                      years of successful operation the accelerator team, with
                      strong support from the XFEL strategy process, is working to
                      define an accelerator upgrade scenario for possible
                      implementation in the next decade.The main goal of the
                      upgrade is to facilitate more bunches per second with larger
                      bunch spacing while maintaining the high energy of the beam,
                      a world record amongst FEL machines. Possible scenarios
                      include continuous-wave (CW) and long-pulse operating modes,
                      collectively referred to as high duty cycle (HDC).This paper
                      describes the different operating modes un-der investigation
                      and the $R\&D$ activities ongoing at DESY to support the
                      upgrade. The main focus of the pa-per is on the cryomodule
                      and cavity design modifications, while also giving a brief
                      introduction of the other challenging aspects connected to
                      the upgrade.},
      month         = {Sep},
      date          = {2025-09-21},
      organization  = {The 22nd International Conference on
                       RF Superconductivity, Hamburg (DE), 21
                       Sep 2025 - 26 Sep 2025},
      cin          = {MKS1 / MSL},
      cid          = {I:(DE-H253)MKS1-20210408 / I:(DE-H253)MSL-20170609},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/639324},
}