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@INPROCEEDINGS{Bousonville:478351,
      author       = {Bousonville, Michael and Choroba, Stefan and Grevsmühl,
                      Torsten and Goeller, Sebastian and Hauberg, Axel and
                      Weinhausen, Timo},
      title        = {{S}olving the {USB} {C}ommunication {P}roblem of the
                      {H}igh-{V}oltage {M}odulator {C}ontrol {S}ystem in the
                      {E}uropean {XFEL}},
      address      = {[Geneva]},
      publisher    = {JACoW Publishing, Geneva, Switzerland},
      reportid     = {PUBDB-2022-02556},
      isbn         = {978-3-95450-215-8},
      pages        = {451-453},
      year         = {2022},
      note         = {Literaturangaben;},
      comment      = {Proceedings of the 31st International Linear Accelerator
                      Conference, LINAC2022, Liverpool, UK},
      booktitle     = {Proceedings of the 31st International
                       Linear Accelerator Conference,
                       LINAC2022, Liverpool, UK},
      abstract     = {Since the commissioning of the modulators in the European
                      XFEL in 2016, it happened from time to time that the
                      modulator control system hung up. The reason for the problem
                      was unknown at that time. Initially, the MTBF (Mean Time
                      Between Failure) was 10⁴ days, which was so rare that
                      other problems with the RF system clearly dominated and were
                      addressed first. Over the next 2 years, the error became
                      more frequent and occurred on average every 18 days. After
                      the winter shutdown of the XFEL in 2020, the problem became
                      absolutely dominant, with an MTBF of 2 days. Therefore, the
                      fault was investigated with top priority and was finally
                      identified. Two units of the control electronics communicate
                      via USB 2.0 with the main server. Using special measurement
                      technology, it was possible to prove that weak signal levels
                      in the USB signal led to bit errors and thus to the crash of
                      the control electronics. This article describes the
                      troubleshooting process, how to measure the signal quality
                      of USB signals and how the problem was solved in the end.},
      month         = {Aug},
      date          = {2022-08-28},
      organization  = {31st International Linear Accelerator
                       Conference, Liverpool (UK), 28 Aug 2022
                       - 2 Sep 2022},
      keywords     = {Accelerator Physics (Other) / Technology (Other) / controls
                      (autogen) / electron (autogen) / interface (autogen) / FEL
                      (autogen) / operation (autogen)},
      cin          = {MHF / MHFp / MPC},
      cid          = {I:(DE-H253)MHF-20220923 / I:(DE-H253)MHFp-20210408 /
                      I:(DE-H253)MPC-20210120},
      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-LINAC2022-TUPOPA17},
      url          = {https://bib-pubdb1.desy.de/record/478351},
}