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@ARTICLE{Gonzalez:878574,
      author       = {Gonzalez, W. and Biel, W. and Mertens, Ph. and Tokar, M.
                      and Marchuk, O. and Mourão, F. and Linsmeier, Ch.},
      title        = {{P}reliminary study of a visible, high spatial resolution
                      spectrometer for {DEMO} divertor survey},
      journal      = {Journal of Instrumentation},
      volume       = {15},
      number       = {01},
      issn         = {1748-0221},
      address      = {London},
      publisher    = {Inst. of Physics},
      reportid     = {FZJ-2020-02917},
      pages        = {C01008 - C01008},
      year         = {2020},
      abstract     = {Developments towards DEMO Diagnostic and Control $(D\&C)$
                      system conceptual design are based on a subset of ITER
                      mature diagnostic systems, whose eligibility for DEMO has
                      been endorsed by their robustness, long lifetime expectancy
                      and feasible remote maintenance [1]. They are devoted to
                      ensure the machine operation in compliance with safety
                      requirements and high availability. In particular, the
                      evolution of divertor spectroscopic measurements on fusion
                      experiments has demonstrated their potential as a control
                      method for divertor protection via detachment control
                      $\cite{2,3}$ (near ultraviolet, 300–400 nm) and monitoring
                      of the plasma-wall interaction (visible range, 400–700 nm)
                      [2]. These characteristics make this method one of the
                      leading candidates for DEMO detachment and radiation control
                      power. In line with the application of a system engineering
                      approach [3], initial assessments of design and feasibility
                      of a VIS high spatial resolution spectrometer for the DEMO
                      divertor survey based on early DEMO control requirements are
                      presented and discussed. The proposed system is located at
                      the equatorial port and it is composed of 3 oblique lines of
                      sights (LoS), 9 toroidal mirrors, 6 plane mirrors and 6
                      spectrometers examining the outer, inner and X-point
                      divertor region, optimized for the monitoring of
                      chord-integrated NUV/VIS signals under parallel divertor
                      plasmas observation. The wavelengths of interest, spatial
                      resolution and main integration issues are reported.},
      cin          = {IEK-4},
      ddc          = {610},
      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:000525449100008},
      doi          = {10.1088/1748-0221/15/01/C01008},
      url          = {https://juser.fz-juelich.de/record/878574},
}