% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{Rauer:478856,
      author       = {Rauer, Patrick},
      othercontributors = {Rossbach, Joerg and Decking, Winfried and Hillert,
                          Wolfgang},
      title        = {{A} {P}roof-{O}f-{P}rinciple {C}avity-{B}ased {X}-{R}ay
                      {F}ree-{E}lectron-{L}aser {D}emonstrator at the {E}uropean
                      {XFEL}},
      school       = {Universität of Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron DESY},
      reportid     = {PUBDB-2022-02800, DESY-THESIS-2022-010},
      series       = {DESY-THESIS},
      pages        = {279},
      year         = {2022},
      note         = {Work was partially funded under BMBF project ”LoKoFEL:
                      Longitudinale Kohärenz am Freie-Elektronen-Laser -
                      Kontrolle, Analyse und An-wendungen” (FKZ 05K16GU4);
                      Dissertation, Universität of Hamburg, 2022},
      abstract     = {This thesis is centered on the foreseen realization and
                      performance of a proof-of-principle cavity based (hard)
                      X-ray FEL (CBXFEL) demonstrator experiment at the European
                      XFEL facility. A CBXFEL promises to address the prominent
                      issue of longitudinal coherence and (stable) high, narrow
                      bandwidth spectral flux in the hard X-ray regime, in which
                      the usually employed self amplified spontaneous emission
                      (SASE) scheme is severely lacking.In order to study the
                      highly coupled system of FEL production, X-ray propagation
                      and the crystals’ thermal response, affecting the
                      reflection characteristics, a computational frame-work was
                      set up. It chains the popular Genesis-1.3 FEL program with
                      the self-written,highly optimized parallel X-ray Cavity
                      Propagator (pXCP) wavefront propagation code and a finite
                      element (FE) based modeling of the strongly non-linear
                      thermal diffusion. In order to properly account for
                      low-temperature thermal transport with an increased
                      relevance of phonon boundary scattering, thermal
                      conductivities obtained from first-principles simu-lation
                      are used.Thorough simulations are carried out, which account
                      for realistic electron bunch distri-bution, inter RF-pulse
                      bunch fluctuations and various possible errors of the X-ray
                      optics.They reveal that with well inside state of the art
                      optical tolerances, a simplistic two crystalback scattering
                      setup would fulfill the main goal of the demonstrator, which
                      is to proof that seeding and exponential radiation build
                      with spectral narrowing occurs. However, due tothe strong
                      heating of the crystals and the following thermoelastic
                      response, stable operationat high peak brilliance will not
                      be feasible. Following the principle, experimental nature
                      ofthe CBXFEL demonstrator setup, these effects will need to
                      be properly measured. Usingthis data, counter measures can
                      be developed towards the future realization of a
                      permanentCBXFEL source at the European XFEL facility.},
      cin          = {MXL / $XFEL_DO_ID_XRO$ / CFEL-ACC},
      cid          = {I:(DE-H253)MXL-20160301 /
                      $I:(DE-H253)XFEL_DO_ID_XRO-20210408$ /
                      I:(DE-H253)CFEL-ACC-20161114},
      pnm          = {621 - Accelerator Research and Development (POF4-621) /
                      6G13 - Accelerator of European XFEL (POF4-6G13) / PHGS,
                      VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G13 /
                      $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2022-02800},
      url          = {https://bib-pubdb1.desy.de/record/478856},
}