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@ARTICLE{Serkez:472329,
      author       = {Serkez, Svitozar and Geloni, Gianluca and Guetg, Marc and
                      Kocharyan, Vitali and Liu, Shan and Saldin, Evgeni},
      title        = {{D}elay-{D}etune {S}can for {L}ongitudinal {E}lectron
                      {B}eam {C}haracterization at {F}ree-{E}lectron {L}asers},
      journal      = {Physical review accelerators and beams},
      volume       = {23},
      number       = {12},
      issn         = {1098-4402},
      address      = {College Park, MD},
      publisher    = {American Physical Society},
      reportid     = {PUBDB-2021-04998},
      pages        = {122801},
      year         = {2020},
      abstract     = {We present first experimental results of a novel method to
                      study the energy chirp of the electron beam lasing window at
                      a free-electron laser operating in self-amplified
                      spontaneous emission mode. The method requires a single
                      magnetic chicane splitting the FEL undulator into two parts
                      of several gain lengths each. Undulator segments should have
                      variable gaps. By scanning both the delay in the chicane and
                      detuning in a part of the undulators, one can retrieve the
                      linear component of both the radiation frequency chirp and
                      the electron energy chirp. In addition, such scan improves
                      the accuracy of the previously proposed
                      autocorrelation-based pulse duration measurement technique.
                      The proposed method targets facilities that lack direct
                      diagnostics of the electron beam longitudinal phase space
                      distribution. It also can be extended to diagnose transverse
                      tilts of the beam.},
      keywords     = {Beam Control, Diagnostics, and Feedback (autogen)},
      cin          = {$XFEL_E2_SPF$ / MXL / MPY / MCS},
      ddc          = {530},
      cid          = {$I:(DE-H253)XFEL_E2_SPF-20210408$ / I:(DE-H253)MXL-20160301
                      / I:(DE-H253)MPY-20120731 / I:(DE-H253)MCS-20120806},
      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)16},
      UT           = {WOS:000614890000004},
      doi          = {10.1103/PhysRevAccelBeams.23.122801},
      url          = {https://bib-pubdb1.desy.de/record/472329},
}