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Enhancement of current drive efficiency for electron cyclotron waves

The frequency range of an electron cyclotron current drive is explored, in order to enhance the current drive efficiency. Its model is based on a two-dimensional, relativistic, bounce-averaged Fokker-Planck equation. The current drive efficiency is enhanced by a largely Doppler-shifted (up-shifted) frequency, using the relationship Y<or approximately= gamma -1, where Y=l omega ce/ omega (l:harmonic number, omega ce: electron cyclotron frequency, omega : injection frequency) and gamma is the relativistic factor. The behavior of the enhanced efficiency is examined under the toroidal effect as well as the DC electric field effect.