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A fast wave current drive scheme is shown to be a promising technique for a reactor-grade plasma, avoiding the limitations of lower hybrid waves, provided that the frequency is carefully chosen. Ray tracing calculations of current drive by ICRF waves due to e-TTMP (transit time magnetic pumping), and ELD damping in large tokamaks are presented. For ITER-like parameters, it is shown that a TTMP fast wave current drive efficiency factor of 0.28 can be obtained at T(e) = 30 keV, for an antenna array located on the midplane. The tokamak poloidal field can significantly change the excited K(parallel) spectrum and the efficiency factor can deteriorate significantly, particularly if the antennae are located off the midplane.

Additional information

Authors: BHATNAGAR V P, JET Joint Undertaking, Abingdon, Oxon. (GB);JACQUINOT J ET AL., JET Joint Undertaking, Abingdon, Oxon. (GB);MOREAU D, CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: JET-P(90)22 EN (1990) 25 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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