When an intense relativistic electron beam traversed a magnetic field of novel configuration, ∼ 25 MW of narrow-band microwave power was emitted near the relativistic cyclotron frequency. The emitted waves are superluminous and propagate in a direction transverse to the applied magnetic field. The process is coherent, is driven by population inversion, and depends on the relativistic mass change.
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Granatstein et al. (1974) studied this question.
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