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@INPROCEEDINGS{Tischer:618828,
      author       = {Tischer, Markus and Bienert, Hilmar and Götze, Kathrin and
                      Neumann, Paul and Ramm, Torsten and Schoeps, Andreas and
                      Talkovski, Peter and Telawane, Sayali and Vagin, Pavel},
      title        = {{C}onstruction and commissioning of an {APPLE}-{III}
                      afterburner undulator as a prototype for radiators in the
                      new seeding line of {FLASH}2020+},
      journal      = {Journal of physics / Conference Series},
      volume       = {3010},
      number       = {1},
      issn         = {1742-6588},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2024-07181},
      pages        = {012045},
      year         = {2025},
      abstract     = {An APPLE-III undulator with 17.5 mm period length operating
                      at aminimum magnetic gap of 8 mm was installed downstream of
                      the FLASH2 SASEundulators. This device serves as an
                      afterburner and was designed to providearbitrarily (also
                      circularly) polarized light at the 3rd harmonic of the
                      FLASH2radiation with a wavelength of 1.33 nm to 1.77 nm
                      (890-700eV), covering theabsorption L-edges of the magnetic
                      3d elements. After characterization of thedifferent
                      polarization modes at different wavelengths in a first
                      commissioningphase, first user experiments have been
                      conducted.Here, we report on our experiences with the
                      mechanical and magnetic assemblyof the APPLE-III UE17 as
                      well as on magnetic measurements and tuning oftrajectories
                      and phase errors at the different polarization states.},
      month         = {Aug},
      date          = {2024-08-26},
      organization  = {15th International Conference on
                       Synchrotron Radiation Instrumentation,
                       Hamburg (Germany), 26 Aug 2024 - 30 Aug
                       2024},
      cin          = {FS-US},
      ddc          = {530},
      cid          = {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)FLASH2020p-20221201},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
      doi          = {10.1088/1742-6596/3010/1/012045},
      url          = {https://bib-pubdb1.desy.de/record/618828},
}