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@ARTICLE{Reiser:838661,
      author       = {Reiser, D. and Borodin, D. and Brezinsek, S. and Kirschner,
                      A. and Kreter, A. and Romazanov, J. and Schlummer, T. and
                      Eksaeva, Alina},
      title        = {{P}lasma-wall interactions in the presence of plasma
                      fluctuations—interpretation of line emission from
                      sputtered tungsten in {PSI}-2},
      journal      = {Physica scripta},
      volume       = {T170},
      issn         = {1402-4896},
      address      = {Bristol},
      publisher    = {IoP Publ.},
      reportid     = {FZJ-2017-07230},
      pages        = {014039 -},
      year         = {2017},
      note         = {bitte die Autoren bestätigen},
      abstract     = {The analysis in this work essentially addresses the general
                      question to what extent the temporal average of a particular
                      quantity which is a highly nonlinear function of fluctuating
                      quantities can be approximated by using the averages of the
                      fluctuating quantities for its evaluation. The concrete case
                      considered is the line emission intensity from sputtered
                      impurities being a function of fluctuating electron density
                      and temperature in a plasma beam of the PSI-2 device. A
                      three-dimensional fluid model is employed to study the
                      impact of plasma fluctuations on the distribution of
                      particles and line emission in PSI-2 discharges and its
                      interpretation in long-term measurements. In the model
                      presented the solution of a vorticity equation to obtain a
                      self-consistent electric field is avoided and a synthetic
                      turbulent velocity field is included instead. This approach
                      is based on a Langevin model including advection and allows
                      numerically efficient parameter scans by controlling
                      amplitude, correlation length and correlation time of plasma
                      fluctuations known from extended 3D simulations and/or
                      experiment. The synthetic turbulence model considered is an
                      extension of established stochastic models used for studies
                      of passive scalar advection and therefore, it is described
                      in detail in a general framework. Numerical examples of
                      PSI-2 applications show that a double log-normal probability
                      density function for the electrons and impurity ions is
                      likely to occur and that this supports the conclusion that
                      very high levels of intermittency are required to find a
                      significant impact on the experimental evaluation method
                      which is based on temporal averages only. Consequently, for
                      typical PSI-2 experiments the method of evaluation based on
                      averaged plasma parameters is justified.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {174 - Plasma-Wall-Interaction (POF3-174) / HITEC -
                      Helmholtz Interdisciplinary Doctoral Training in Energy and
                      Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-174 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000414120500039},
      doi          = {10.1088/1402-4896/aa8db2},
      url          = {https://juser.fz-juelich.de/record/838661},
}