Abstract

The high-harmonic gyro-klystron relies on the synchronous interaction between axis-encircling electrons and a high order azimuthal TE n11 cylindrical cavity mode. Harmonic operation together with RF acceleration of the electron beam constitute a compact moderate- to high-power millimeter wave amplifier. Experimental results for a fifth harmonic, four-cavity device are compared to theoretical predictions which assess gain, bandwidth, sensitivity to longitudinal velocity spread, self-oscillation and saturation characteristics. A gain of 37 dB has been achieved at the fifth harmonic of the cyclotron frequency. The peak output power was 65 W.

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