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Full current drive operation has been achieved on ASDEX for different ohmic target plasmas, by means of 2.45 GHz lower hybrid waves. Variations of the current drive efficiency up to 50% have been observed, which correlate with the spectral broadening of the pump wave as detected by an electromagnetic probe. Either parametric decay instabilities at the plasma edge or scattering of the lower hybrid waves could be responsible for these effects. The results can be explained within the approximations of available current drive theory with a simple model which assumes that the same process that lead to the frequency broadening also causes a modification of the launched n(parallel) spectrum.

Additional information

Authors: PERICOLI-RIDOLFINI V ET AL., ENEA, Centro Ricerche Energia Frascati, Roma (IT);LEUTERER F ET AL., Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);BERNABEI S, Princeton University, Plasma Physics Laboratory (US)
Bibliographic Reference: Report: RT/NUCL/90/10 EN (1990) 12 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
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