We report the first experimental verification of a gyrotwistron amplifier. The device utilized a single 9.858 GHz, TE₀₁₁ cavity, a heavily attenuated drift tube, and a long tapered output waveguide section. With a 440 kV, 200-245 A, 1 {μ}s electron beam and a sharply tapered axial magnetic field, peak powers above 21 MW were achieved with a gain near 24 dB. Performance was limited by competition from a fundamental TE₁₁ mode. A multimode code was developed to analyze this system, and simulations were in good agreement with the experiment.
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Latham et al. (1994) studied this question.
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