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@ARTICLE{Tokar:852582,
      author       = {Tokar, Mikhail},
      title        = {{A}ssessment for erosion of and impurity deposition on
                      first mirrors in a fusion reactor},
      journal      = {Nuclear fusion},
      volume       = {58},
      number       = {9},
      issn         = {1741-4326},
      address      = {Vienna},
      publisher    = {IAEA},
      reportid     = {FZJ-2018-05494},
      pages        = {096007 -},
      year         = {2018},
      abstract     = {Hot atoms with chaotically directed velocities are
                      generated by charge-exchange with plasma ions of neutrals
                      recycling from the vessel wall of a fusion reactor. Some of
                      them flee into openings in the vessel made for ducts guiding
                      to diagnostic installations; in particular, to first mirrors
                      for optical observations. On the one hand, hot atoms,
                      hitting the mirror directly, can erode its surface. On the
                      other hand, impurity species, released from the walls of the
                      vessel and of the diagnostic duct, migrate to the mirror and
                      can be deposited there. Both the erosion of and impurity
                      deposition on the mirror decline its reflection
                      properties.Models elaborated to describe processes above are
                      outlined, including a 2D kinetic description for neutral
                      species in the vicinity of the duct opening, an assessment
                      for the erosion of the duct walls and mirror surface by hot
                      atoms, estimates for influxes of the wall material into the
                      duct and a consideration of the migration of impurity atoms
                      along the duct. Calculations are done for the conditions
                      predicted for a fusion reactor like DEMO. The rates for
                      erosion of and impurity deposition on first mirrors of Mo
                      are assessed versus input parameters such as the duct
                      radius, the distance from the opening to the mirror, the
                      density n g of the working gas in the duct, the
                      probabilities for impurity sticking to the duct wall and
                      mirror surface. It is demonstrated that, by n g exceeding a
                      level of m−3, the mirror sputtering can be reduced to the
                      target level of 1 nm per full power year. Moreover, for
                      long enough ducts the erosion rate of impurities deposited
                      onto the mirror exceeds their deposition one and no
                      formation of impurity precipitations on the mirror surface
                      has to be expected.},
      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:000437412100007},
      doi          = {10.1088/1741-4326/aac95c},
      url          = {https://juser.fz-juelich.de/record/852582},
}