Microwave-radiation bursts at λ∼1 cm are observed when a rotating relativistic electron beam interacts with a plasma. The power level exceeds 1 MW, and the radiation pulse lasts as long as the electron beam pulse for beams up to 1 μsec long. The results are consistent with a model of coherent curvature radiation from electrons bunched due to a two-stream instability. Other mechanisms are ruled out by observations of harmonic splittings and the power spectrum.
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Tzach et al. (1979) studied this question.
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