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@INPROCEEDINGS{RnschSchulenburg:643102,
      author       = {Rönsch-Schulenburg, Juliane and Braune, Markus and
                      Brenner-Abild, Günter and Dziarzhytski, Siarhei and Götze,
                      Kathrin and Kuhlmann, Marion and Niknejadi, Pardis and
                      Schaper, Lucas and Schneidmiller, Evgeny Alexanrdovich and
                      Schoeps, Andreas and Tischer, Markus and Vagin, Pavel and
                      Vogt, Mathias and Zemella, Johann},
      title        = {{O}peration of the variable polarization undulator on the
                      third harmonic of a {SASE} {FEL}},
      journal      = {Proceedings of SPIE},
      volume       = {13536},
      issn         = {0038-7355},
      address      = {Bellingham, Wash.},
      publisher    = {SPIE},
      reportid     = {PUBDB-2025-05846},
      pages        = {1353604},
      year         = {2025},
      note         = {Waiting for fulltext},
      comment      = {X-Ray Free-Electron Lasers: Advances in Source Development
                      and Instrumentation VII : [Proceedings] - SPIE, 2025. - ISBN
                      97815106886819781510688698 - doi:10.1117/12.3058405},
      booktitle     = {X-Ray Free-Electron Lasers: Advances
                       in Source Development and
                       Instrumentation VII : [Proceedings] -
                       SPIE, 2025. - ISBN
                       97815106886819781510688698 -
                       doi:10.1117/12.3058405},
      abstract     = {FLASH is a XUV and soft X-ray free-electron laser and
                      operates as a user facility since 2005. It comprises
                      asuperconducting LINAC with a beam energy of up to 1.35 GeV
                      which serves two FEL beamlines in parallel:FLASH1 and
                      FLASH2. The FLASH2 main undulator beamline generates SASE
                      radiation up to a photon energyof 390 eV in the fundamental.
                      Additionally, an APPLE-III type undulator has been installed
                      downstream ofthe FLASH2 SASE undulator section to generate
                      soft X-ray radiation with tunable polarization at the
                      thirdharmonic of the FLASH2 main undulator wavelength. Using
                      this so-called afterburner, photons with up to860 eV have
                      been demonstrated with selectable polarization. We describe
                      the suppression of the strong thirdharmonic background
                      radiation generated by the FLASH2 main undulator, which is
                      linearly polarized and thusdisturbs the desired polarization
                      state.},
      month         = {Apr},
      date          = {2025-04-07},
      organization  = {X-Ray Free-Electron Lasers: Advances
                       in Source Development and
                       Instrumentation VII, Prague (Czech
                       Republic), 7 Apr 2025 - 11 Apr 2025},
      cin          = {MFL / FS-FLASH-O / FS-FLASH-B / FS-US / MPY},
      ddc          = {620},
      cid          = {I:(DE-H253)MFL-20120731 / I:(DE-H253)FS-FLASH-O-20160930 /
                      I:(DE-H253)FS-FLASH-B-20160930 / I:(DE-H253)FS-US-20120731 /
                      I:(DE-H253)MPY-20120731},
      pnm          = {621 - Accelerator Research and Development (POF4-621) / 6G2
                      - FLASH (DESY) (POF4-6G2)},
      pid          = {G:(DE-HGF)POF4-621 / G:(DE-HGF)POF4-6G2},
      experiment   = {EXP:(DE-H253)F-FELdiag-20171201},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.1117/12.3058405},
      url          = {https://bib-pubdb1.desy.de/record/643102},
}