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@PHDTHESIS{Serkez:275967,
      author       = {Serkez, Svitozar},
      title        = {{D}esign and {O}ptimization of the {G}rating
                      {M}onochromator for {S}oft {X}-{R}ay {S}elf-{S}eeding
                      {FEL}s},
      issn         = {1435-8085},
      school       = {Universität Hamburg},
      type         = {Dr.},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2015-04348, DESY-THESIS-2015-043},
      series       = {DESY-THESIS},
      pages        = {143},
      year         = {2015},
      note         = {Universität Hamburg, Diss., 2015},
      abstract     = {The emergence of Free Electron Lasers (FEL) as a fourth
                      generation of light sources is a breakthrough. FELs
                      operating in the X-ray range (XFEL) allow one to carry out
                      completely new experiments that probably most of the natural
                      sciences would benefit. Self-amplified spontaneous emission
                      (SASE) is the baseline FEL operation mode: the radiation
                      pulse starts as a spontaneous emission from the electron
                      bunch and is being amplified during an FEL process until it
                      reaches saturation. The SASE FEL radiation usually has poor
                      properties in terms of a spectral bandwidth or, on the other
                      side, longitudinal coherence. Self-seeding is a promising
                      approach to narrow the SASE bandwidth of XFELs significantly
                      in order to produce nearly transform-limited pulses. It is
                      achieved by the radiation pulse monochromatization in the
                      middle of an FEL amplification process. Following the
                      successful demonstration of the self-seeding setup in the
                      hard X-ray range at the LCLS, there is a need for a
                      self-seeding extension into the soft X-ray range.Here a
                      numerical method to simulate the soft X-ray self seeding
                      (SXRSS) monochromator performance is presented. It allows
                      one to perform start-to-end self-seeded FEL simulations
                      along with (in our case) GENESIS simulation code. Based on
                      this method, the performance of the LCLS self-seeded
                      operation was simulated showing a good agreement with an
                      experiment. Also the SXRSS monochromator design developed in
                      SLAC was adapted for the SASE3 type undulator beamline at
                      the European XFEL.The optical system was studied using
                      Gaussian beam optics, wave optics propagation method and ray
                      tracing to evaluate the performance of the monochromator
                      itself. Wave optics analysis takes into account the actual
                      beam wavefront of the radiation from the coherent FEL
                      source, third order aberrations and height errors from each
                      optical element.The monochromator design is based on a
                      toroidal VLS grating working at a fixed incidence angle
                      mounting without both entrance and exit slits. It is
                      optimized for the spectral range of $300-1200$~eV providing
                      resolving power above $ 7000 $. The proposed monochromator
                      is composed of three mirrors and the grating. Start-to-end
                      simulation as a case study of the self-seeded European XFEL
                      performance with a proposed SXRSS monochromator is
                      presented. It shows that the laser pulse power reaches a
                      TW-level with its spectral density about eighty times higher
                      than that of the conventional SASE pulse at saturation.},
      cin          = {FS-PS / Eur.XFEL / MPY},
      cid          = {I:(DE-H253)FS-PS-20131107 / $I:(DE-H253)Eur_XFEL-20120731$
                      / I:(DE-H253)MPY-20120731},
      pnm          = {631 - Accelerator R $\&$ D (POF3-631)},
      pid          = {G:(DE-HGF)POF3-631},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
      doi          = {10.3204/DESY-THESIS-2015-043},
      url          = {https://bib-pubdb1.desy.de/record/275967},
}