The operation of a high harmonic gyro-traveling-wave-tube amplifier which is based on the synchronous interaction of a rotating beam of large orbit, axis-encircling electrons with a TEₙ₁ cylindrical waveguide mode is described. Principal results include amplification of the TE₈₁ mode at the eighth harmonic of the cyclotron frequency mode with a small signal gain of 10 dB, an instantaneous interaction bandwidth of 4.3%, and a saturated power transfer of 0.5 kW.
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Furuno et al. (1989) studied this question.
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