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The lower hybrid current drive antenna, or grill, to be used on JET will efficiently couple to the plasma if the density in front of the antenna face is in the range n(e) = 0.7 - 1.3 x 1.0 E18 /m3, with the optimal value depending on the relative phase between adjacent multijunction modules of the antenna. The effect of coupling of a limiter in close proximity to the antenna mouth is estimated. The required grill face curvature is calculated, based on the local flux surface geometry, and is compared to the range of conditions expected in JET. An antenna shape is found which is adequate for most vertically symmetric JET limiter plasmas.

Additional information

Authors: KNOWLTON S, JET Joint Undertaking, Abingdon, Oxon.(GB)
Bibliographic Reference: Report: JET-R(88)20 EN (1988)
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 198910712 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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