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@INPROCEEDINGS{Brinker:472699,
      author       = {Brinker, Frank and Casalbuoni, Sara and Freund, Wolfgang},
      title        = {{C}orrecting the {M}agnetic {F}ield {O}ffsets {I}nside the
                      {U}ndulators of the {E}u{XFEL} {U}sing the
                      {K}-{M}onochromator},
      reportid     = {PUBDB-2021-05174},
      year         = {2021},
      abstract     = {Hard X-ray free-electron lasers (XFELs) generate intense
                      coherent X-ray beams by passing electrons through
                      undulators, i.e. very long periodic magnet structures, which
                      extend over hundreds of meters. A crucial condition for the
                      lasing process is the spatial overlap of the electrons with
                      the electromagnetic field. Well-established electron
                      beam-based procedures allow finding a straight trajectory
                      for the electrons defined by the beam position monitors
                      (BPM) between the undulators. A bending of the trajectory in
                      between the BPMs cannot be seen by these methods. A general
                      field offset inside the undulators has the effect that the
                      synchrotron radiation is emitted at a different angle at the
                      beginning and the end of the undulator which can result in a
                      degradation of the FEL-gain especially for very short
                      wavelengths. We report on how the spectral and spatial
                      characteristics of the monochromatized radiation of a single
                      undulator can be used to minimize the field offset in situ
                      with the help of correction coils.},
      month         = {May},
      date          = {2021-05-24},
      organization  = {12th International Particle
                       Accelerator Conference, Campinas
                       (Brazil), 24 May 2021 - 28 May 2021},
      keywords     = {Accelerator Physics (Other) / MC2: Photon Sources and
                      Electron Accelerators (Other)},
      cin          = {MIN / $XFEL_DO_ID_UND$ / $XFEL_DO_ID_XPD$},
      cid          = {I:(DE-H253)MIN-20120731 /
                      $I:(DE-H253)XFEL_DO_ID_UND-20210408$ /
                      $I:(DE-H253)XFEL_DO_ID_XPD-20210408$},
      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)24},
      url          = {https://bib-pubdb1.desy.de/record/472699},
}