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@ARTICLE{Bahns:607651,
      author       = {Bahns, Immo and Rauer, Patrick and Rossbach, Jörg and
                      Steinlechner, Sebastian and Sinn, Harald},
      title        = {{T}hermoelastic effects in {B}ragg reflectors as a
                      potential bottleneck for {XFEL}s with megahertz repetition
                      rate},
      journal      = {Communications Physics},
      volume       = {7},
      number       = {1},
      issn         = {2399-3650},
      address      = {London},
      publisher    = {Springer Nature},
      reportid     = {PUBDB-2024-01980},
      pages        = {95},
      year         = {2024},
      abstract     = {Bragg reflectors are essential for beam transport in X-ray
                      free-electron laser (XFEL) facilities. On interaction with
                      Bragg reflectors, a part of the pulse energy will be
                      absorbed, causing the propagation of displacement waves due
                      to rapid thermal expansion. It is suspected that these waves
                      may cause stability problems for XFELs operating with
                      megahertz repetition rates. Here, we experimentally
                      investigate the displacement of a diamond Bragg reflector
                      induced by an optical ultra-violet laser pulse, simulating
                      XFEL pulses with mJ pulse energy, both at room temperature
                      and cryogenic temperatures.Our experiment shows negligible
                      damping of the displacement waves on μs timescales, which
                      could cause disruption for subsequent XFEL pulses. We
                      compare our measurements to a simulation framework based on
                      the assumptions of local thermodynamic equilibrium and
                      classical mechanics, observing reasonable agreement. Our
                      results show that thermoelastic effects are critical for a
                      reliable stability assessment of Bragg reflectors, but are
                      often overlooked.},
      cin          = {$XFEL_DO_ID_XRO$},
      ddc          = {530},
      cid          = {$I:(DE-H253)XFEL_DO_ID_XRO-20210408$},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G13 - Accelerator of European XFEL
                      (POF4-6G13)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G13},
      experiment   = {EXP:(DE-H253)XFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001185287200001},
      doi          = {10.1038/s42005-024-01581-1},
      url          = {https://bib-pubdb1.desy.de/record/607651},
}