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The combined effects of an electric field and externally driven magnetized Langmuir waves on the tail of an electron distribution function are studied analytically. The runaway production rate is enhanced by many orders of magnitude if the source, even though weak, drives waves with parallel phase velocities around the critical velocity. A practical formula to quantify this phenomenon is derived. Depending on the source strength two different regimes may occur: one is stable and linear with the RF power, whilst the other, which saturates, may be unstable. Connections with lower-hybrid current-drive experiments are discussed.
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Muschietti et al. (1982) studied this question.
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