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The ERO-TEXTOR code is described in detail. The code solves the kinetic equations of impurities in the scrape-off layer of a tokamak plasma in the vicinity of material surfaces like limiters or divertors. A relaxation time ansatz in the traced impurity limit is chosen, taking the gyromotion of the particles into account. Since the background plasma is slightly non-maxwellian at the plasma edge, higher order correction (thermal forces) to the relaxation time ansatz are also considered. Background plasma parameters are calculated from a simple plasma model (ie the one dimensional continuity and momentum equations are used to derive the local electron density, the local flow velocity and the pre-sheath and electric fields). Since these calculations are not done in a selfconsistent way, the measured values of electron density and temperature are used as basic input to derive the dependency of these quantities. The regarded magnetic topology is still straight and uniform. A detailed account is also given of the plasma surface interaction and the erosion/deposition processes. A linear differential equation model for multi species impact on a material surface has been developed and is used in a discrete time step approximation.

Additional information

Authors: KÖGLER U, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);WINTER J, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);KOGLER U, Forschungszentrum Julich GmbH, Institut fur Plasmaphysik (DE)
Bibliographic Reference: Report: Jül-3361 EN (1997) 159pp
Availability: Available from Forschungszentrum Jülich GmbH, Zentralbibliothek, S2425 Jülich (DE)
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