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Nonlinear Ion Heating in Lower Hybrid Current Drive

Vincent S. Chan, Chuan Sheng Liu

Fusion Science and Technology

Volume 7 / Number 2 / March 1985 / Pages 288-295


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A theory is presented to account for the wave energy in lower hybrid current drive experiments when the density threshold for decay into ion cyclotron quasi-mode is exceeded. Immediately above the threshold, convective losses dominate and discrete sidebands are excited. These sidebands have much larger wave-numbers, and strong minority ion heating is possible. Majority ion heating occurs, however, only at high power. At higher densities, ion Landau damping becomes important. The frequency spectrum is non-monotonic in this region with the minimum frequency determined by nonlinear coupling. Majority ion absorption is significant even at moderate power levels.

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