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@ARTICLE{Trebushinin:598140,
      author       = {Trebushinin, Andrei and Geloni, Gianluca and Serkez,
                      Svitozar and Mercurio, Giuseppe and Gerasimova, Natalia and
                      Maltezopoulos, Theophilos and Guetg, Marc and Schneidmiller,
                      Evgeny Alexanrdovich},
      title        = {{E}xperimental {D}emonstration of
                      {A}ttoseconds-at-{H}armonics at the {SASE}3 {U}ndulator of
                      the {E}uropean {XFEL}},
      journal      = {Photonics},
      volume       = {10},
      number       = {2},
      issn         = {2304-6732},
      address      = {Basel},
      publisher    = {MDPI},
      reportid     = {PUBDB-2023-06751},
      pages        = {131},
      year         = {2023},
      abstract     = {We report on observations of single spike spectra
                      $(3–13\%$ of events) upon employing a previously proposed
                      method for single spike generation via harmonic conversion.
                      The method was tested at the soft X-ray SASE3 undulator of
                      the European XFEL. The first part of the undulator allows
                      one to amplify bunching at the fundamental as well as the
                      higher harmonics. The downstream undulator is tuned to a
                      harmonic, the fourth in our case, to amplify pulses with a
                      shorter duration. We estimate the generated pulse duration
                      within such a subset of short pulses at a level of 650 as.
                      Considering the demonstrated probability of single spike
                      events, this method is attractive for high repetition-rate
                      free electron lasers.},
      cin          = {MXL / Eur.XFEL / XFEL-User / MPY},
      ddc          = {530},
      cid          = {I:(DE-H253)MXL-20160301 / $I:(DE-H253)Eur_XFEL-20120731$ /
                      I:(DE-H253)XFEL-User-20170713 / I:(DE-H253)MPY-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:000940934700001},
      doi          = {10.3390/photonics10020131},
      url          = {https://bib-pubdb1.desy.de/record/598140},
}