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@ARTICLE{Dreimann:599041,
      author       = {Dreimann, Matthias and Wahlert, Frank and Eckermann, Dennis
                      and Rosenthal, Felix and Roling, Sebastian and Reiker,
                      Tobias and Kuhlmann, Marion and Toleikis, Sven and
                      Brachmanski, Maciej and Treusch, Rolf and Plönjes, Elke and
                      Siemer, Björn and Zacharias, Helmut},
      title        = {{T}he soft {X}-ray and {XUV} split-and-delay unit at
                      beamlines {FL}23/24 at {FLASH}2},
      journal      = {Journal of synchrotron radiation},
      volume       = {30},
      number       = {2},
      issn         = {0909-0495},
      address      = {Chester, UK},
      publisher    = {Wiley-Blackwell},
      reportid     = {PUBDB-2023-07125},
      pages        = {479 - 489},
      year         = {2023},
      abstract     = {A split-and-delay unit for the extreme ultraviolet and soft
                      X-ray spectral regions has been built which enables
                      time-resolved experiments at beamlines FL23 and FL24 at the
                      Free-electron LASer in Hamburg (FLASH). Geometric wavefront
                      splitting at a sharp edge of a beam splitting mirror is
                      applied to split the incoming soft X-ray pulse into two
                      beams. Ni and Pt coatings at grazing incidence angles have
                      been chosen in order to cover the whole spectral range of
                      FLASH2 and beyond, up to hν = 1800 eV. In the variable
                      beam path with a grazing incidence angle of ϑd = 1.8°, the
                      total transmission (T) ranges are of the order of 0.48 < T <
                      0.84 for hν < 100 eV and T > 0.50 for 100 eV < hν <
                      650 eV with the Ni coating, and T > 0.06 for hν <
                      1800 eV for the Pt coating. For a fixed beam path with a
                      grazing incidence angle of $ϑ_f$ = 1.3°, a transmission of
                      T > 0.61 with the Ni coating and T > 0.23 with a Pt coating
                      is achieved. Soft X-ray pump/soft X-ray probe experiments
                      are possible within a delay range of −5 ps < $Δt$ <
                      +18 ps with a nominal time resolution of tr = 66 as and
                      a measured timing jitter of $t_j$ = 121 ± 2 as. First
                      experiments with the split-and-delay unit determined the
                      averaged coherence time of FLASH2 to be $τ_c$ = 1.75 fs
                      at $λ$ = 8 nm, measured at a purposely reduced coherence
                      of the free-electron laser.},
      cin          = {DOOR ; HAS-User / FS-FLASH-B / FS-FLASH-O / Eur.XFEL /
                      XFEL-User},
      ddc          = {550},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-FLASH-B-20160930 /
                      I:(DE-H253)FS-FLASH-O-20160930 /
                      $I:(DE-H253)Eur_XFEL-20120731$ /
                      I:(DE-H253)XFEL-User-20170713},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G2 - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)F-PL23-20230101 /
                      EXP:(DE-H253)F-FL24-20150901},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {36891862},
      UT           = {WOS:000948969700022},
      doi          = {10.1107/S1600577523000395},
      url          = {https://bib-pubdb1.desy.de/record/599041},
}