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@ARTICLE{Schneidmiller:485348,
      author       = {Schneidmiller, E. A. and Macias, I. J. Bermudez and Beye,
                      M. and Braune, M. and Czwalinna, M.-K. and Duesterer, S. and
                      Faatz, B. and Ivanov, R. and Jastrow, F. and Kuhlmann, M.
                      and Roensch-Schulenburg, J. and Schreiber, S. and Sorokin,
                      A. and Tiedtke, K. and Yurkov, M. V. and Zemella, J.},
      title        = {{T}wo-color operation of a soft x-ray {FEL} with
                      alternation of undulator tunes},
      reportid     = {PUBDB-2022-06650, DESY-22-180. arXiv:2211.07426},
      year         = {2022},
      abstract     = {FLASH is the first soft X-ray FEL user facility, routinely
                      providing brilliant photon beams for users since 2005. The
                      second undulator branch of this facility, FLASH2, is
                      gap-tunable which allows to test and use advanced lasing
                      concepts. In particular, we developed a two-color operation
                      mode based on the alternatingly tuned undulator segments
                      (every other segment is tuned to the second wavelength).
                      This scheme is advantageous in comparison with a subsequent
                      generation of two colors in two consecutive sections of the
                      undulator line. First, source positions of the two FEL beams
                      are close to each other which makes it easier to focus them
                      on a sample. Second, the amplification is more efficient in
                      this configuration since the segments with respectively
                      'wrong' wavelength still act as bunchers. We studied
                      operation of this scheme in the regime of small and large
                      separation of tunes (up to a factor of two). We developed
                      new methods for online intensity measurements of the two
                      colors simultaneously that require a combination of two
                      detectors. We also demonstrated our capabilities to measure
                      spectral and temporal properties of two pulses with
                      different wavelengths.},
      cin          = {MPY / FS-FL / FS-FLASH-O / MSK / FS-FLASH-D / MFL /
                      FS-FLASH-B / $XFEL_DO_ID_LAS$},
      ddc          = {600},
      cid          = {I:(DE-H253)MPY-20120731 / I:(DE-H253)FS-FL-20120731 /
                      I:(DE-H253)FS-FLASH-O-20160930 / I:(DE-H253)MSK-20120731 /
                      I:(DE-H253)FS-FLASH-D-20160930 / I:(DE-H253)MFL-20120731 /
                      I:(DE-H253)FS-FLASH-B-20160930 /
                      $I:(DE-H253)XFEL_DO_ID_LAS-20210408$},
      pnm          = {6G2 - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)F-FELdiag-20171201},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2211.07426},
      howpublished = {arXiv:2211.07426},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2211.07426;\%\%$},
      doi          = {10.3204/PUBDB-2022-06650},
      url          = {https://bib-pubdb1.desy.de/record/485348},
}