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@ARTICLE{Singer:166962,
      author       = {Singer, A. and Lorenz, U. and Sorgenfrei, F. and
                      Gerasimova, N. and Gulden, J. and Yefanov, O. M. and Kurta,
                      R. P. and Shabalin, A. and Dronyak, R. and Treusch, R. and
                      Kocharyan, V. and Weckert, E. and Wurth, W. and Vartanyants,
                      I. A.},
      title        = {{H}anbury {B}rown–{T}wiss {I}nterferometry at a
                      {F}ree-{E}lectron {L}aser},
      journal      = {Physical review letters},
      volume       = {111},
      number       = {3},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {DESY-2014-01731},
      pages        = {034802},
      year         = {2013},
      abstract     = {We present measurements of second- and higher-order
                      intensity correlation functions (so-calledHanbury
                      Brown—Twiss experiment) performed at the free-electron
                      laser (FEL) FLASH in the non-linearregime of its operation.
                      We demonstrate the high transverse coherence properties of
                      the FEL beam with adegree of transverse coherence of about
                      $80\%$ and degeneracy parameter of the order 109 that makes
                      itsimilar to laser sources. Intensity correlation
                      measurements in spatial and frequency domain gave anestimate
                      of the FEL average pulse duration of 50 fs. Our measurements
                      of the higher-order correlationfunctions indicate that FEL
                      radiation obeys Gaussian statistics, which is characteristic
                      to chaotic sources.},
      cin          = {FS-PS / DOOR / FS-FL / UNI/EXP / MCS 4},
      ddc          = {550},
      cid          = {I:(DE-H253)FS-PS-20131107 / I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-FL-20120731 / $I:(DE-H253)UNI_EXP-20120731$ /
                      $I:(DE-H253)MCS_4-20120731$},
      pnm          = {FLASH Beamline PG2 (POF2-54G16) / VH-VI-403 - In-Situ
                      Nano-Imaging of Biological and Chemical Processes
                      $(2015_IFV-VH-VI-403)$},
      pid          = {G:(DE-H253)POF2-PG2-20130405 /
                      $G:(DE-HGF)2015_IFV-VH-VI-403$},
      experiment   = {EXP:(DE-H253)F-PG2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000322000300008},
      pubmed       = {pmid:23909331},
      doi          = {10.1103/PhysRevLett.111.034802},
      url          = {https://bib-pubdb1.desy.de/record/166962},
}