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Abstract

This paper deals with the thermal stability and equilibrium of a confined plasma when impurity radiation is the dominant loss mechanism near the edge. The energy transport in this peripheral region can be approximately described by an equation, which is shown to be stable as long as the electron density n-e, the impurity density n-z, the thermal conductivity K and the radiation function L are all functions of T alone and thus do not depend explicitly on x. By contrast, instability is possible if n-e increases linearly with distance and occurs if more than about half the power conducted into the edge region is radiated. These simple results are demonstrated and extended by 1-D computer modelling of INTOR with iron in coronal equilibrium as the impurity.

Additional information

Authors: ASHBY D E T F, CULHAM LABORATORY, ABINGDON, OXON. (UK);HUGHES M H CULHAM LABORATORY, ABINGDON, OXON. (UK), CULHAM LABORATORY, ABINGDON, OXON. (UK)
Bibliographic Reference: WRITE TO HER MAJESTY'S STATIONERY OFFICE, P.O. BOX 569, LONDON SC1 9NH (UK), MENTIONING REPORT CLM-R 228, 1982. PRICE: POUNDS STERLING: 2.00
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