Guowu Ma

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Backward-wave oscillator (BWO) is a promising candidate as a millimeter-wave and submillimeter-wave (MMW/SMMW) power source and has a compact configuration, moderate output power, and frequency-tuning abilities. The physical conditions for increasing the threshold current of a typical MMW/SMMW-BWO are theoretically studied in this paper. We demonstrate the(More)
The design of a W-band third harmonic gyrotron operating at the TE<sub>6,1</sub> mode is presented. The low order whispering gallery mode TE<sub>6,1</sub> is chosen as the operating mode for the purpose of suppressing mode competition with lower harmonic modes. And an iris resonator is used in order to lower the start current of the third harmonic mode. The(More)
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