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Previous descriptions of neutral gas transport in poloidal divertors, limiter scrape-off regions and in pump limiters have been attempted by means of Monte Carlo methods. In these approaches the confining walls are described by quadratic surfaces, and the pseudo collision and the tracklength estimator, combined with nonanalogue methods such as generalised splitting and Russian roulette (importance sampling), were employed as estimators. In this work the procedure used is inherent to general pipe configurations with arbitrary torsion and curvature and resorts to a decomposition into finite plane geometrical elements. For the plasma domain, generalised pseudo collision or "pseudo tracklength" estimators are used, both of which allow direct measurement of the decisive ionisation rate. In the vacuum regions, the standard tracklength estimator is employed.

Additional information

Authors: NICOLAI A, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Paper presented: 17th European Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN35799 ORA
Record Number: 199011629 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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