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@ARTICLE{Trebushinin:643547,
      author       = {Trebushinin, Andrei and Serkez, Svitozar and Freund,
                      Wolfgang and Koch, Andreas and Gruenert, Jan and Geloni,
                      Gianluca and Qin, Weilun and Tomin, Sergey},
      title        = {{F}irst {O}bservation of {S}ynchrotron {R}adiation {S}pikes
                      for {T}ransverse {E}lectron {B}eam {S}ize {M}easurements at
                      a {F}ree-{E}lectron {L}aser},
      journal      = {Physical review letters},
      volume       = {135},
      number       = {21},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2026-00277},
      pages        = {215001},
      year         = {2025},
      abstract     = {We report the observation of transverse intensity
                      fluctuations—spikes—in synchrotron radiation from a
                      single undulator cell at the European XFEL after
                      monochromatization. Autocorrelation analysis of the recorded
                      events confirms that these fluctuations originate from the
                      partial transverse coherence of the radiation. By
                      calculating the second-order autocorrelation function, we
                      determined the averaged transverse slice size of the
                      electron beam along the SASE1 undulator. The measurements
                      were performed with 5.49 keV x-ray photons using a
                      commissioning silicon monochromator with (111) Bragg
                      reflection and an x-ray imager. This technique enables
                      undulator cell-by-cell diagnostics of the transverse
                      electron beam size at free-electron laser facilities.},
      cin          = {MXL},
      ddc          = {530},
      cid          = {I:(DE-H253)MXL-20160301},
      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-Exp-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/z89g-f7j6},
      url          = {https://bib-pubdb1.desy.de/record/643547},
}