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@ARTICLE{Tokar:842663,
      author       = {Tokar, Mikhail},
      title        = {{A}ccelerated procedure to solve kinetic equation for
                      neutral atoms in a hot plasma},
      journal      = {Journal of physics / Conference Series},
      volume       = {936},
      number       = {1},
      issn         = {1742-6596},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2018-00870},
      pages        = {012009 -},
      year         = {2017},
      abstract     = {The recombination of plasma charged components, electrons
                      and ions of hydrogen isotopes, on the wall of a fusion
                      reactor is a source of neutral molecules and atoms,
                      recycling back into the plasma volume. Here neutral species
                      participate, in particular, in charge-exchange (c-x)
                      collisions with the plasma ions and, as a result, atoms of
                      high energies with chaotically directed velocities are
                      generated. Some fraction of these hot atoms hit the wall.
                      Statistical Monte Carlo methods normally used to model c-x
                      atoms are too time consuming for reasonably small level of
                      accident errors and extensive parameter studies are
                      problematic. By applying pass method to evaluate integrals
                      from functions, including the ion velocity distribution, an
                      iteration approach to solve one-dimensional kinetic equation
                      [1], being alternative to Monte Carlo procedure, has been
                      tremendously accelerated, at least by a factor of 30-50 [2].
                      Here this approach is developed further to solve the 2-D
                      kinetic equation, applied to model the transport of c-x
                      atoms in the vicinity of an opening in the wall, e.g., the
                      entrance of the duct guiding to a diagnostic installation.
                      This is necessary to determine firmly the energy spectrum of
                      c-x atoms penetrating into the duct and to assess the
                      erosion of the installation there. The results of kinetic
                      modeling are compared with those obtained with the diffusion
                      description for c-x atoms, being strictly relevant under
                      plasma conditions of low temperature and high density, where
                      the mean free path length between c-x collisions is much
                      smaller than that till the atom ionization by electrons. It
                      is demonstrated that the previous calculations [3], done
                      with the diffusion approximation for c-x atoms, overestimate
                      the erosion rate of Mo mirrors in a reactor by a factor of 3
                      compared to the result of the present kinetic study.},
      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:000428194400009},
      doi          = {10.1088/1742-6596/936/1/012009},
      url          = {https://juser.fz-juelich.de/record/842663},
}