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A generalised energy principle is used to determine the effect of ion cyclotron resonant heating (ICRH) on the stability of m = 1 internal kink displacements in the low frequency limit, displacements associated with sawtooth oscillations. An integral expression is obtained for the contribution to the plasma energy of an ICRH-heated minority ion population with strong temperature anisotropy, which relates the former to the ICRH power input and its deposition profile. If the perpendicular temperature of the hot ions exceeds the parallel temperature by a factor of ten or more, and r(1) is greater than about one third of the plasma minor radius, trapped ions have a greater stabilising effect than passing ions. Stabilisation is most easily achieved if r(1) is small. The hot-ion plasma energy depends strongly on the value of the perpendicular temperature.

Additional information

Authors: DENDY R O, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);HASTIE R J, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);MCCLEMENTS K G, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB);MARTIN T J, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: UKAEA FUS 276 EN (1994) 27 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199510080 / Last updated on: 1995-01-10
Original language: en
Available languages: en