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In the plasma edge region the fluctuation level of electromagnetic fields and plasma parameters is rather high and cross-field transport is dominated by drift motion and anomalous diffusion-convection processes. In the drift-kinetic equation, electromagnetic field fluctuations introduce mixed derivatives of the guiding-centre distribution function with respect to space and velocity coordinates, complicating the solution considerably. A direct solution with arbitrary non-Maxwellian source functions, as in the case of impurities sputtered from a limiter or divertor target, has to be sought by numerical methods. For source functions not deviating too far from a shifted Maxwellian, as in the case of impurity ions fed into the scrape-off layer by recycling from the plasma core or by ionisation of thermally released wall impurities, the moment solution method appears a reasonable alternative. This is discussed in relation to local and non-local transport relations in the presence of anomalous cross-field transport.

Additional information

Authors: CLAAßEN H A, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);GERHAUSER H, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);CLAA?EN H A, Forschungszentrum Julich GmbH, Institut fur Plasmaphysik (DE)
Bibliographic Reference: Article: Contributions to Plasma Physics, Vol. 32 (1992) No. 3-4, pp. 290-296
Record Number: 199310276 / Last updated on: 1994-11-29
Original language: en
Available languages: en