A new high-voltage, intense-beam, Ka-band gyrotron experiment is underway using a 350-400-keV 0.5-1-kA beam from a short-pulse Febetron pulser. High-power operation at 35 GHz has been observed, with 20 MW (±3 dB) produced at ~8.5-percent efficiency in a "whispering-gallery" TE62 mode. Operation in other modes and at other frequencies has also been studied.
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Gold et al. (1985) studied this question.
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