Abstract

Gyrotron backward-wave oscillators (gyro-BWOs) extending to the terahertz (THz) band require high-order modes to improve the power-handling capability. Here we investigate a THz high-order whispering-gallery mode (WGM) gyro-BWO equipped with a cathode-end output circuit. The segment-tapered circuit contributes to uplifting the start-oscillation currents of the near-cutoff competing mode and reclaiming the dominance of operating mode. The scheme is applicable to other high-order mode gyro-BWOs with broadband tuning.

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