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A method is proposed for improving the efficiency of cyclotron resonance heating of a toroidal plasma by ordinary mode radiation from the outside of the torus. Radiation not absorbed in the first pass is reflected from the inside of the torus by a corrugated surface which rotates the polarization by 90 °, so that a secondary source of extraordinary waves is created in the high field, accessible region of the plasma.
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Motley et al. (1981) studied this question.
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