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@INPROCEEDINGS{Tischer:580798,
      author       = {Tischer, M. and Bienert, H. and Götze, K. and Meissner, D.
                      and Neumann, Paul and N'Gotta, Patrick and Ramm, T. and
                      Schöps, A. and Talkovski, P. and Telawane, S. and Vagin,
                      P.},
      title        = {{D}evelopment of an {APPLE}-{III} undulator for {FLASH}-2},
      journal      = {Journal of physics / Conference Series},
      volume       = {2380},
      number       = {1},
      issn         = {1742-6588},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2023-01446},
      pages        = {012017},
      year         = {2023},
      abstract     = {The use of circularly polarized soft X-rays at the
                      FLASH-FEL at DESY will be a very versatile tool for
                      investigation of dynamic properties in nanomagnetism. For
                      that purpose, the development of a variable polarization
                      undulator was started to provide an afterburner downstream
                      of the FLASH2 SASE undulators. It will serve to produce
                      circularly polarized light with a wavelength of 1.33 nm to
                      1.77 nm (890 eV - 700 eV) to investigate the L-edges of Fe,
                      Co, and Ni. This wavelength range together with the future
                      maximum beam energy of 1.35 GeV at FLASH leaves only a small
                      and ambitious parameter window for the undulator if a
                      noteworthy tunability range shall be provided.We report on
                      design and development of an APPLE-III undulator with 17.5
                      mm period length operating at a minimum magnetic gap of 8 mm
                      which will make use of a magnetic force compensation scheme.
                      A short prototype has been built to verify and iterate both
                      the mechanical and magnetic concept. Details on the keeper
                      design, results of the magnetic measurements and the tuning
                      concept will be presented.},
      month         = {Mar},
      date          = {2022-03-28},
      organization  = {14th International Conference on
                       Synchrotron Radiation Instrumentation,
                       Hamburg (Germany), 28 Mar 2022 - 1 Apr
                       2022},
      cin          = {FS-US / ZM1},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-US-20120731 / I:(DE-H253)ZM1-20120731},
      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)FLASHII(machine)-20150901 /
                      EXP:(DE-H253)FLASH2020p-20221201},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8},
      doi          = {10.1088/1742-6596/2380/1/012017},
      url          = {https://bib-pubdb1.desy.de/record/580798},
}