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It is necessary to operate a divertor with both a sufficiently high plasma density at the symmetry point n(s), adjacent to the main plasma, to satisfy the Lawson criterion and, at the same time, a low enough value of the plasma temperature at the target plate T(t), to minimise sputtering. The possibilities for realising these two objectives simultaneously are examined. It is found that the combination of high n(s) and low T(t) may require that the plasma flow be supersonic before reaching the divertor sheath. It is not known whether such plasma conditions are stable.

Additional information

Authors: STANGEBY P C, University of Toronto, Institute for Aerospace Studies, Ontario, Canada (CA)
Bibliographic Reference: Report: JET-P(90)60 EN (1990) 11 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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