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The linear Monte Carlo computer code EIRENE for calculation of free molecular flow of neutral gases through a background plasma has been extended to the non-linear transition flow regime (Knudsen number 0.1 - 10). Motivation arose from higher gas densities in the range of 1.0 E13 - 1.0 E15/cm3 appearing in the scrape-off layer and in parts of the vacuum system of advanced tokamak experiments. To treat the problem, the direct Monte Carlo simulation method of Bird, a kinetic approach, was chosen, since the conditions for application of continuum theory are not met. As a result of this work, a 3-D computer code for correct prediction of neutral gas behaviour in the transition flow regime with a background plasma is now available. By coupling with a plasma code, fully consistent solutions of non-linear neutral-plasma interaction problems are possible.

Additional information

Authors: BEHRINGER T, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE)
Bibliographic Reference: Report: Jül-2637 DE (1992) 117 pp.
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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