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@PROCEEDINGS{RnschSchulenburg:620019,
      author       = {Rönsch-Schulenburg, Juliane and Braune, Markus and
                      Brenner, Guenter and Dziarzhytski, Siarhei and Honkavaara,
                      Katja and Kuhlmann, Marion and Niknejadi, Pardis and
                      Schaper, Lucas and Schneidmiller, Evgeny Alexanrdovich and
                      Schoeps, Andreas and Schreiber, Siegfried and Tischer,
                      Markus and Treusch, Rolf and Vagin, Pavel and Vogt, Mathias
                      and Zemella, Johann},
      title        = {{G}eneration of {S}hort {W}avelength at {V}ariable
                      {P}olarization in {FLASH}2},
      reportid     = {PUBDB-2024-08096},
      year         = {2024},
      abstract     = {FLASH, the world’s first XUV and soft X-ray freeelectron
                      laser is a user facility since 2005 and operates two SASE
                      beamlines in parallel: FLASH1 and FLASH2, since 2014. In the
                      FLASH2 main undulator beamline radiation down to 3.2 nm
                      wavelength in the fundamental has been demonstrated. In
                      order to efficiently generate soft X-ray radiation at the
                      third harmonic of the FLASH2 main undulator wavelength with
                      tunable polarization, an additional APPLE-III type undulator
                      has been installed downstream of the FLASH2 SASE undulator
                      section. This so-called afterburner allows one to reach
                      wavelengths down to 1.33 nm with selectable polarization.
                      The afterburner undulator also serves as a full-scale
                      prototype for the FLASH1 seeding radiators to be installed
                      in 2025. This paper describes the successful commissioning
                      with beam, the demonstration of the amplification of the
                      third harmonic and the generation of different polarizations
                      and operation of the afterburner undulator.},
      month         = {Aug},
      date          = {2024-08-19},
      organization  = {41st International Free Electron Laser
                       Conference, Warsaw (Poland), 19 Aug
                       2024 - 23 Aug 2024},
      cin          = {MFL / FS-US},
      cid          = {I:(DE-H253)MFL-20120731 / I:(DE-H253)FS-US-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)FLASH(machine)-20150101},
      typ          = {PUB:(DE-HGF)26},
      url          = {https://bib-pubdb1.desy.de/record/620019},
}