Amplification studies of a two-cavity second-harmonic gyroklystron are reported. A magnetron injection gun produces a 440 kV, 200--245 A, 1 {μ}s beam with an average perpendicular-to-parallel velocity ratio slightly less than 1. The TE₀₁₁ input cavity is driven near 9.88 GHz and the TE₀₂₁ output cavity resonates near 19.76 GHz. Peak powers exceeding 21 MW are achieved with an efficiency near 21% and a large signal gain above 25 dB. This performance represents the current state of the art for gyroklystrons in terms of the peak power normalized to the output wavelength squared.
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Lawson et al. (1993) studied this question.
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