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@ARTICLE{Neubauer:864589,
      author       = {Neubauer, Olaf and Charl, Anton and Czymek, Guntram and
                      Gao, Yu and Knaup, Martin and König, Ralf and Krychowiak,
                      Maciej and Lambertz, Horst-Toni and Lennartz, M. and
                      Linsmeier, Christian and Satheeswaran, G. and Schweer, Bernd
                      and Schülke, Mathias and Sereda, Stepan},
      title        = {{E}ndoscopes for observation of plasma-wall interactions in
                      the divertor of {W}endelstein 7-{X}},
      journal      = {Fusion engineering and design},
      volume       = {146},
      issn         = {0920-3796},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2019-04300},
      pages        = {19 - 22},
      year         = {2019},
      abstract     = {The stellarator Wendelstein 7-X is being prepared for long
                      pulse operation. This includes diagnostics for investigation
                      of plasma wall interaction processes. A versatile optical
                      observation system has been developed for local
                      characterization of the divertor plasma and the divertor
                      target surface. The optical systems consist of two
                      endoscopes each with perpendicular fields of view and the
                      opportunity of tomographic reconstruction. Mirror based
                      optics has been chosen in order to assure good optical
                      properties independent of the wavelength. A narrow field of
                      view allows for high spatial resolution while rotation of
                      the first mirror covers the full poloidal divertor sections.
                      An integrated shutter mechanism and a vacuum window far back
                      minimize coating of optical components. For assessment of
                      change of light transmission, a relative calibration
                      function is implemented. The output light is split into
                      wavelength ranges. Both, cameras equipped with narrow band
                      filters as well as spectrometers are connected. The first
                      endoscope was mounted at W7-X after successfully passing
                      mechanical, optical and functional tests.},
      cin          = {IEK-4 / IEK-6 / ZEA-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013 / I:(DE-Juel1)IEK-6-20101013 /
                      I:(DE-Juel1)ZEA-1-20090406},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000488307400006},
      doi          = {10.1016/j.fusengdes.2018.11.009},
      url          = {https://juser.fz-juelich.de/record/864589},
}