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@INPROCEEDINGS{Fogel:582569,
      author       = {Fogel, Vladimir and Ayvazyan, Valeri and Bellandi, Andrea
                      and Branlard, Julien and Bousonville, Michael and Butkowski,
                      Lukasz and Cherepenko, Andrey and Choroba, Stefan and
                      Diomede, Marco and Eckoldt, Hans-Joerg and Goeller,
                      Sebastian and Hartung, Jens and Hauberg, Axel and Walker,
                      Nicholas John and Weinhausen, Timo},
      title        = {{O}ptimization of klystron drive signal and {HV} shape to
                      reduce energy consumption during operation of the {E}uropean
                      {XFEL}},
      address      = {[Geneva]},
      publisher    = {JACoW Publishing},
      reportid     = {PUBDB-2023-02058},
      isbn         = {978-3-95450-231-8},
      pages        = {1806-1808},
      year         = {2023},
      note         = {Literaturangaben;},
      comment      = {[Ebook] IPAC'23 : 14th International Particle Accelerator
                      Conference, 7-12 May 2023, Venice, Italy : proceedings /
                      hosting institutions: INFN, Elettra Sincotrone Trieste ,
                      [Geneva] : JACoW Publishing, [2023],},
      booktitle     = {[Ebook] IPAC'23 : 14th International
                       Particle Accelerator Conference, 7-12
                       May 2023, Venice, Italy : proceedings /
                       hosting institutions: INFN, Elettra
                       Sincotrone Trieste , [Geneva] : JACoW
                       Publishing, [2023],},
      abstract     = {Currently 26 RF stations are in operation at the European
                      X-ray Free Electron Laser (XFEL) and all RF stations can
                      deliver sufficient power to support 600 µs beam pulse with
                      an energy up to 17 GeV. These beam parameters require a
                      power consumption of about 4.9 MW for high-power RF. Of
                      course, the simplest way to save power is to reduce the XFEL
                      repetition rate, but with some additional work and research,
                      and without modifying any hardware, we can save the
                      modulator power, without any impact on the XFEL performance.
                      To reduce the power, we offer two methods that can be used
                      together or separately. The first one is to make full use of
                      the available power of the klys-tron during the rise and
                      fall time of the HV pulse, and partial use of the available
                      power during cavity filling by using phase and amplitude
                      compensation. As a result, we can reduce the length of the
                      HV pulse, because we fill the cavities with energy earlier.
                      The second one is to slowly reduce the klystron HV during
                      flattop. In total we can reduce the power consumption up to
                      $30\%,$ at the cost of making the low-level RF control more
                      complicated as it needs to deal with large phase and
                      amplitude changes. To solve this problem, we propose a new
                      feature, dynamic output vector correction (OVC). In this
                      report we will present some of experimental results from the
                      klystron test stand and from several XFEL RF stations.},
      month         = {May},
      date          = {2023-05-07},
      organization  = {14th International Particle
                       Accelerator Conference, Venice (Italy),
                       7 May 2023 - 12 May 2023},
      keywords     = {Accelerator Physics (Other) /
                      mc2-photon-sources-and-electron-accelerators - MC2: Photon
                      Sources and Electron Accelerators (Other) /
                      mc2-a06-free-electron-lasers - MC2.A06: Free Electron Lasers
                      (Other)},
      cin          = {MHF / MPC / MSK},
      cid          = {I:(DE-H253)MHF-20220923 / I:(DE-H253)MPC-20210120 /
                      I:(DE-H253)MSK-20120731},
      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)8 / PUB:(DE-HGF)7},
      doi          = {10.18429/JACoW-IPAC2023-TUPL018},
      url          = {https://bib-pubdb1.desy.de/record/582569},
}