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Proper optimisation of antenna parameters can lead to high efficiency kinetic Alfven-wave current drive in plasmas with elongated cross sections. The optimal parameters include (i) finite, non-zero azimuthal wave number m = 1, (ii) large toroidal wave number n = 5 to 8, (iii) an antenna array consisting of at least n elements with adjacent elements phased pi/2 apart, (iv) Faraday shielding, and (v) plasma cross-section elongation s > 1.5, which together with the finite beta, helps in moderating the trapped-particle effects by locating the resonance close to the plasma axis.

Additional information

Authors: PURI S, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);WILHELM R, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Report: IPP4/236 EN (1988)
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 198910226 / Last updated on: 1994-12-01
Original language: en
Available languages: en