Verlag des Forschungszentrums Jülich
JUEL-3829
Zagorski, R.; Gerhauser, H.; Bienkowska, B.; Claassen, Hans-Arno
Modelling of Drifts and Currents in the Edge Plasma
23 S., 2000
For the purpose of modelling the plasma transport in the boundary layer
>of limiter tokamaks, a complete set of multifluid equations is derived for
>general curvilinear coordinates, which are for TEXTOR or Tore Supra adapted
>to circular magnetic flux surfaces. The classical parallel and the anomalous
>radial and perpendicular viscosities are carefully taken into account. All
>drifts and electric currents are calculated and analyzed in detail. In the
>scrape-off layer the electric potential (and electric field) is essentially
>determined by the sheath potential drop at the limiter surfaces, whereas in
>the transition layer inside the separatrix the global ambipolarity constraint
>and the perpendicular viscosity must be used, such that the problem is
>reduced to the solution of a second order differential equation for the
>radial electric field at some poloidal reference position. The derivation of
>the coefficients and the numerical procedure is outlined.
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