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An adequate description of plasmas with several ion species is of importance for transport modelling of hydrogen isotopes and impurities in the scrape-off layer (SOL) of thermonuclear devices, and a hydrodynamic approximation is often used for this purpose. A common ion sound velocity along the magnetic field is usually taken as the boundary condition for the motion equations of all species at the material surfaces - limiters or divertor plates. In principle such a choice is arbitrary. The present paper shows that only one condition (being an analog of the Bohm criterium) can be posed at the material surface; other conditions are not the boundary ones and must be posed at a certain intermediate point in the flow, which position is not known a priori.

Additional information

Authors: TOKAR M Z, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. II (1993) pp. 831-834
Record Number: 199311152 / Last updated on: 1994-11-29
Original language: en
Available languages: en