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In JET high-performance discharges, ion cyclotron resonance frequency heating is used routinely in combination with neutral beam injection. Although NBI is the dominating heating mechanism, ICRF heating has been found to play an important role in obtaining good performance. The impact of various ICRF techniques on the performance has been analyzed using numerical simulations. In the hydrogen minority heating scheme second harmonic deuteron absorption is found to improve central bulk ion heating. By using multiple ICRF frequencies the tails in the distribution functions of the resonating ions can be tailored to enhance the bulk ion heating. Bulk ion heating fractions of up to 50% of the total ICRF power have been obtained in this way. Analysis of the 3He minority heating is fist optimized shear discharges at 4T is presented.

Additional information

Authors: GORMEZANO C, JET Joint Undertaking, Abingdon (GB);RIMINI F G, JET Joint Undertaking, Abingdon (GB);SIPS A C C, JET Joint Undertaking, Abingdon (GB)
Bibliographic Reference: Article: JET-P(99) (1999), 5pp.
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