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The efficiency of contamination of the core plasma arising from different impurity generation mechanisms at the edge has been examined using the two-dimensional impurity transport code LIM. The specific example of the JET belt shape limiters, made of carbon or beryllium, has been analysed. If self-sputtering is neglected, then primary generation mechanisms which produce slow neutrals such as sublimation, including carbon Radiation Enhanced Sublimation (RES), are found to be relatively benign compared with D+ physical sputtering, when compared on the basis of equal influxes. For the same influx of neutral impurities, the core contamination level can be smaller by up to an order of magnitude. When self-sputtering is included in the analysis, the differences in the overall efficiency of core contamination associated with the different primary generation mechanisms are much reduced.

Additional information

Authors: STANGEBY P C, University of Toronto, Institute for Aerospace Studies, Downsview, Ontario (CA);FARRELL C, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(89)70 EN (1989) 50 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199011434 / Last updated on: 1994-12-02
Original language: en
Available languages: en