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Abstract

A generalised energy principle that takes into account the non-standard, potato-shaped trapped particle orbits of high energy ions in the central region of a tokamak is derived and applied to the stability of internal kink modes in plasmas with auxiliary heating at the ion cyclotron resonant frequency. In the standard banana orbit theory, the stabilising influence of the fast ions increases with the inverse of the width of the ICRF heating region for a fixed amount of hot particle energy content. It is shown that stabilisation can be further enhanced when the fast particle orbits extend beyond the heating region.

Additional information

Authors: PORCELLI F, JET Joint Undertaking, Abingdon, Oxon. (GB);BERK H L, University of Texas, Institute for Fusion Studies, Austin (US);ZHANG Y Z, University of Texas, Institute for Fusion Studies, Austin (US)
Bibliographic Reference: Report: JET-P(91)35 EN (1991) 14 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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