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A model of the plasma boundary region has been developed to study the flow of impurities generated at the target plates in the pumped divertor configuration planned for JET. The model is one dimensional, parallel to the magnetic field, in the flow equations but treats the neutral species in two dimensions. All the ionisation stages of an impurity can be treated separately or, alternatively, an average charge impurity species can be considered. The validity of this approximation is assessed. Results presented show that impurities can be retained near the target plates by a forced flow of plasma generated by recirculating, across the separatrix from the main plasma into the scrape-off layer, a fraction of the flow reaching the target plates.

Additional information

Authors: KEILHACKER M, JET Joint Undertaking, Abingdon, Oxon. (GB);SIMONINI R, JET Joint Undertaking, Abingdon, Oxon. (GB);TARONI A, JET Joint Undertaking, Abingdon, Oxon. (GB);WATKINS M L, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(90)37 EN (1990) 19 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199110150 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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