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@ARTICLE{Schneidmiller:209195,
      author       = {Schneidmiller, Evgeny Alexanrdovich and Yurkov, Mikhail},
      title        = {{O}ptimization of a {H}igh {E}fficiency {F}ree {E}lectron
                      {L}aser {A}mplifier},
      journal      = {Physical review accelerators and beams},
      volume       = {18},
      number       = {3},
      issn         = {1098-4402},
      address      = {[S.l.]},
      publisher    = {Soc.},
      reportid     = {PUBDB-2015-02026, DESY-14-161. arXiv:1410.5957},
      pages        = {030705},
      year         = {2015},
      note         = {OA},
      abstract     = {The free electron laser (FEL) amplifier is implemented in
                      x-ray FEL facilities to generate short wavelength radiation.
                      The problem of an efficiency increase of an FEL amplifier is
                      now of great practical importance. The technique of
                      undulator tapering in the postsaturation regime is used at
                      the existing x-ray FELs LCLS, SACLA and FERMI, and is
                      planned for use at FLASH, European XFEL, Swiss FEL, and PAL
                      XFEL. There are also discussions on the future of high peak
                      and average power FELs for scientific and industrial
                      applications. In this paper we perform a detailed analysis
                      of the tapering strategies for high power seeded FEL
                      amplifiers. Analysis of the radiation properties from the
                      modulated electron beam and application of similarity
                      techniques allows us to derive the universal law of the
                      undulator tapering.},
      cin          = {MPY},
      ddc          = {530},
      cid          = {I:(DE-H253)MPY-20120731},
      pnm          = {Facility (machine) FLASH (POF2-FLASH-20130405) / Facility
                      (machine) XFEL (POF2-XFEL-20130405)},
      pid          = {G:(DE-H253)POF2-FLASH-20130405 /
                      G:(DE-H253)POF2-XFEL-20130405},
      experiment   = {EXP:(DE-H253)FLASH(machine)-20150101 /
                      EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000350625000002},
      eprint       = {1410.5957},
      howpublished = {arXiv:1410.5957},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:1410.5957;\%\%$},
      doi          = {10.1103/PhysRevSTAB.18.030705},
      url          = {https://bib-pubdb1.desy.de/record/209195},
}