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@ARTICLE{Geloni:207679,
      author       = {Geloni, Gianluca and Kocharyan, Vitali and Saldin, Evgeny},
      title        = {{T}heoretical {C}omputation of the {P}olarization
                      {C}haracteristics of an {X}-ray {F}ree-{E}lectron {L}aser
                      with {P}lanar {U}ndulator},
      reportid     = {PUBDB-2015-01427, DESY-15-021. arxiv:1502.04627},
      year         = {2015},
      note         = {OA},
      abstract     = {We show that radiation pulses from an X-ray Free-Electron
                      Laser (XFEL) with a planar undulator, which are mainly
                      polarized in the horizontal direction, exhibit a suppression
                      of the vertical polarization component of the power at least
                      by a factor $\lambda_w^2/(4 \pi L_g)^2$, where $\lambda_w$
                      is the length of the undulator period and $L_g$ is the FEL
                      field gain length. We illustrate this fact by examining the
                      XFEL operation under the steady state assumption. In our
                      calculations we considered only resonance terms: in fact,
                      non resonance terms are suppressed by a factor
                      $\lambda_w^3/(4 \pi L_g)^3$ and can be neglected. While
                      finding a situation for making quantitative comparison
                      between analytical and experimental results may not be
                      straightforward, the qualitative aspects of the suppression
                      of the vertical polarization rate at XFELs should be easy to
                      observe. We remark that our exact results can potentially be
                      useful to developers of new generation FEL codes for
                      cross-checking their results.},
      cin          = {Eur.XFEL},
      cid          = {$I:(DE-H253)Eur_XFEL-20120731$},
      pnm          = {6G13 - XFEL (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)25 / PUB:(DE-HGF)15},
      eprint       = {1502.04627},
      howpublished = {arXiv:1502.04627},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1502.04627;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/207679},
}