Community Research and Development Information Service - CORDIS


This report contains four papers on plasma edge theory. The first paper reviews impurity modelling of the Scrape-Off Layer. Simple analytic models are sometimes adequate for relating central impurity levels to edge plasma conditions and for explaining the patterns of net erosion/deposition found on limiters. More sophisticated approaches, which are also necessary, are categorized and reviewed. The second paper discusses how a two-dimensional Monte Carlo impurity atom/ion code, LIM, was used to model a number of DITE and JET experiments including the ratio of charge states collected by the Matthews probe in DITE, the net erosion pattern on the 1986 JET limiters, and radial and toroidal CI, CII, CIII cloud shapes in the vicinity of DITE limiters. The next presentation illustrates the use of LIM (Limiter Impurity) to track impurity atoms and ions toroidally and radially. In the last paper, measured plasma density and temperature profiles have been used as input to a 3-D Monte Carlo neutral code, NIMBUS, to calculate an effective recycling velocity of neutral deuterium from the JET limiters. This result quantitatively explains the observed relation between edge density and central density in JET ohmic discharges.

Additional information

Authors: JET, JET Joint Undertaking, Abingdon, Oxon (GB)
Bibliographic Reference: Report: JET-P(88)55 EN (1988)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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