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Nonresonant parametric decay of lower-hybrid waves, observed in a number of high-power tokamak rf-heating experiments, is positively identified as a decay into ion-cyclotron quasimodes. The decay-wave spectrum, wavelength, and amplitude profile are measured inside a toroidal plasma with pump frequency f₀~3.5fₚᵢ~25fci.
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M. Ono (1981) studied this question.
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