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@ARTICLE{Tokar:172811,
      author       = {Tokar, Mikhail},
      title        = {{Q}uasi-three-dimensional modelling of penetration and
                      influence of impurities in plasma},
      journal      = {Plasma physics and controlled fusion},
      volume       = {56},
      number       = {12},
      issn         = {1361-6587},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2014-06248},
      pages        = {124006 -},
      year         = {2014},
      abstract     = {In fusion devices strongly localized intensive sources of
                      impurities may arise unexpectedly from plasma–wall
                      interactions or can be created deliberately through impurity
                      injection. The spreading of impurities from such sources is
                      essentially a three-dimensional and non-stationary
                      phenomenon involving physical processes of extremely
                      different time scales. Numerical modelling of such events is
                      still a very challenging task, even using most modern
                      computers. To diminish the calculation time drastically, a
                      new quasi-three-dimensional description is proposed,
                      combining a 'shell' model for the impurity penetration
                      process and a two-zone approximation for the main plasma
                      components. This approach allows us to reduce fluid
                      equations for particle, parallel momentum and energy
                      balances of the main and impurity plasma species to
                      one-dimensional equations describing the time evolution of
                      radial profiles of the most characteristic parameters. The
                      assumptions in the approach are verified by comparing its
                      predictions with direct numerical solutions of transport
                      equations. The results of modelling for the penetration
                      process of argon species into hot H-mode plasma during
                      impurity puffing experiments are presented.},
      cin          = {IEK-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-4-20101013},
      pnm          = {136 - Plasma theory (POF2-136)},
      pid          = {G:(DE-HGF)POF2-136},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000346926300010},
      doi          = {10.1088/0741-3335/56/12/124006},
      url          = {https://juser.fz-juelich.de/record/172811},
}