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@ARTICLE{Seon:860634,
      author       = {Seon, Changrae and Hong, Joohwan and Song, Inwoo and Jang,
                      Juhyeok and Lee, Hyeonyong and An, Younghwa and Kim, Bosung
                      and Jeon, Taemin and Park, Jaesun and Choe, Wonho and Lee,
                      Hyeongon and Pak, Sunil and Cheon, MunSeong and Choi,
                      Jihyeon and Kim, Hyeonseok and Biel, Wolfgang and
                      Bernascolle, Philippe and Barnsley, Robin and O’Mullane,
                      Martin},
      title        = {{D}esign of {ITER} divertor {VUV} spectrometer and
                      prototype test at {KSTAR} tokamak},
      journal      = {The European physical journal / D Atomic, molecular,
                      optical and plasma physics D},
      volume       = {71},
      number       = {12},
      issn         = {1434-6079},
      address      = {Heidelberg},
      publisher    = {Springer82339},
      reportid     = {FZJ-2019-01307},
      pages        = {313},
      year         = {2017},
      abstract     = {Design and development of the ITER divertor VUV
                      spectrometer have been performed from the year 1998, and it
                      is planned to be installed in the year 2027. Currently, the
                      design of the ITER divertor VUV spectrometer is in the phase
                      of detail design. It is optimized for monitoring of
                      chord-integrated VUV signals from divertor plasmas, chosen
                      to contain representative lines emission from the tungsten
                      as the divertor material, and other impurities. Impurity
                      emission from overall divertor plasmas is collimated through
                      the relay optics onto the entrance slit of a VUV
                      spectrometer with working wavelength range of 14.6–32 nm.
                      To validate the design of the ITER divertor VUV
                      spectrometer, two sets of VUV spectrometers have been
                      developed and tested at KSTAR tokamak. One set of
                      spectrometer without the field mirror employs a survey
                      spectrometer with the wavelength ranging from 14.6 nm to 32
                      nm, and it provides the same optical specification as the
                      spectrometer part of the ITER divertor VUV spectrometer
                      system. The other spectrometer with the wavelength range of
                      5–25 nm consists of a commercial spectrometer with a
                      concave grating, and the relay mirrors with the same
                      geometry as the relay mirrors of the ITER divertor VUV
                      spectrometer. From test of these prototypes, alignment
                      method using backward laser illumination could be verified.
                      To validate the feasibility of tungsten emission
                      measurement, furthermore, the tungsten powder was injected
                      in KSTAR plasmas, and the preliminary result could be
                      obtained successfully with regard to the evaluation of
                      photon throughput},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174)},
      pid          = {G:(DE-HGF)POF3-174},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000417763500001},
      doi          = {10.1140/epjd/e2017-70825-3},
      url          = {https://juser.fz-juelich.de/record/860634},
}