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@ARTICLE{Liu:491356,
      author       = {Liu, Shan and Grech, Christian and Guetg, Marc and
                      Karabekyan, Suren and Kocharyan, Vitali and Kujala, Naresh
                      and Lechner, Christoph and Long, Tianyun and Mirian, Najmeh
                      and Qin, Weilun and Serkez, Svitozar and Tomin, Sergey and
                      Yan, Jiawei and Abeghyan, Suren and Anton, Jayson and Blank,
                      Vladimir and Boesenberg, Ulrike and Brinker, Frank and Chen,
                      Ye Lining and Decking, Winfried and Dong, Xiaohao and
                      Kearney, Steve and La Civita, Daniele and Madsen, Anders and
                      Maltezopoulos, Theophilos and Rodriguez-Fernandez, Angel and
                      Saldin, Evgeny and Samoylova, Liubov and Scholz, Matthias
                      and Sinn, Harald and Sleziona, Vivien and Shu, Deming and
                      Tanikawa, Takanori and Terentiev, Sergey and Trebushinin,
                      Andrei and Tschentscher, Thomas and Vannoni, Maurizio and
                      Wohlenberg, Torsten and Yakopov, Mikhail and Geloni,
                      Gianluca},
      title        = {{C}ascaded hard {X}-ray self-seeded free-electron laser at
                      megahertz repetition rate},
      journal      = {Nature photonics},
      volume       = {17},
      number       = {11},
      issn         = {1749-4885},
      address      = {London [u.a.]},
      publisher    = {Nature Publ. Group},
      reportid     = {PUBDB-2023-00111},
      pages        = {984 – 991},
      year         = {2023},
      note         = {Russische Institute beteiligt!},
      abstract     = {High-resolution X-ray spectroscopy in the sub-nanosecond to
                      femtosecond time range requires ultrashort X-ray pulses and
                      a spectral X-ray flux considerably larger than that
                      presently available. X-ray free-electron laser (XFEL)
                      radiation from hard X-ray self-seeding (HXRSS) setups has
                      been demonstrated in the past and offers the necessary peak
                      flux properties. So far, these systems could not provide
                      high repetition rates enabling a high average flux. We
                      report the results for a cascaded HXRSS system installed at
                      the European XFEL, currently the only operating
                      high-repetition-rate hard X-ray XFEL facility worldwide. A
                      high repetition rate, combined with HXRSS, allows the
                      generation of millijoule-level pulses in the photon energy
                      range of 6–14 keV with a bandwidth of around 1 eV
                      (corresponding to about 1 mJ/eV peak spectral density) at
                      the rate of ten trains per second, each train including
                      hundreds of pulses arriving at a megahertz repetition rate.
                      At 2.25 MHz repetition rate and photon energies in the 6–7
                      keV range, we observed and characterized the heat-load
                      effects on the HXRSS crystals, substantially altering the
                      spectra of subsequent X-ray pulses. We demonstrated that our
                      cascaded self-seeding scheme reduces this detrimental effect
                      to below the detection level. This opens up exciting new
                      possibilities in a wide range of scientific fields employing
                      ultrafast X-ray spectroscopy, scattering and imaging
                      techniques.},
      cin          = {MPY / MXL / Eur.XFEL},
      ddc          = {530},
      cid          = {I:(DE-H253)MPY-20120731 / I:(DE-H253)MXL-20160301 /
                      $I:(DE-H253)Eur_XFEL-20120731$},
      pnm          = {621 - Accelerator Research and Development (POF4-621) /
                      6G13 - Accelerator of European XFEL (POF4-6G13)},
      pid          = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G13},
      experiment   = {EXP:(DE-H253)XFEL(machine)-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001096218600018},
      doi          = {10.1038/s41566-023-01305-x},
      url          = {https://bib-pubdb1.desy.de/record/491356},
}