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@ARTICLE{Kotov:839893,
      author       = {Kotov, Vladislav},
      title        = {{C}an gas puff be used for cleaning of the diagnostic first
                      mirrors in {ITER}?4},
      journal      = {Fusion engineering and design},
      volume       = {123},
      issn         = {0920-3796},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-07471},
      pages        = {834 - 837},
      year         = {2017},
      abstract     = {Erosion from the first mirrors of optical diagnostics can
                      be enhanced by injecting neutral particles into plasma in
                      the vicinity of the diagnostic entrance aperture. In the
                      present paper feasibility of this method for cleaning from
                      deposits is investigated numerically for conditions of the
                      ITER main chamber diagnostics. Besides erosion on the mirror
                      the local gas puff also increases fluxes of impurities due
                      to sputtering from the neighboring surfaces. Calculations
                      have shown that for external impurities coming from the main
                      chamber (Be) the enhancement of erosion – cleaning effect
                      – by far exceeds the extra deposition. However, two
                      further problems have been revealed which may prevent
                      practical use of the proposed technique. First, the gas
                      puffing rate required for effective cleaning may be too
                      large. Second is the contamination by “internal
                      impurities” – sputtered material of the channels where
                      the mirrors are installed.},
      cin          = {IEK-4},
      ddc          = {620},
      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:000418992000174},
      doi          = {10.1016/j.fusengdes.2017.03.166},
      url          = {https://juser.fz-juelich.de/record/839893},
}