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Abstract

To study current drive via the mode converted slow wave during ICRH we assess for which plasma and wave number mode conversion from the magnetosonic wave to the slow wave can dominate. We have used a simple slab model to investigate the competition between mode conversion and minority cyclotron absorption for a deuterium plasma with H+ and 3He"++" minority species in JET. A 3He"++" minority should be more appropriate for mode conversion current drive than H+ because the 3He"++" concentration can be chosen near its optimum for the Budden absorption'' without bringing the ion hybrid resonance and the cyclotron resonance so close that the minority absorption dominates. 3He"++" minority also allows operation at toroidal numbers which are characteristic of present JET antennae.

Additional information

Authors: FRIED B, JET JOINT UNDERTAKING, ABINGDON, UK;HELLSTEN T, JET JOINT UNDERTAKING, ABINGDON, UK;MOREAU D JET JOINT UNDERTAKING, ABINGDON, UK, JET JOINT UNDERTAKING, ABINGDON, UK
Bibliographic Reference: REPORT JET-P(87)47, 1987, AVAILABILITY: JET, ABINGDON, UK
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