Study on a G-band Second-harmonic Quasi-optical Gyrotron Traveling Wave Tube
To research the high-power gyrotron traveling wave tube(gyro-TWT)suitable for terahertz frequency band,a second-harmonic quasi-optical gyro-TWT based on a quasi-optical confocal waveguide is investigated.The theoretical and simulation results indicate that the quasi-optical waveguide exhibits ex-cellent mode selectivity.By utilizing the second-harmonic operation of the device,the backward wave os-cillation of the fundamental wave and the second harmonic can be effectively suppressed.Based on the the-oretical and simulation research,a G-band second-harmonic quasi-optical gyro-TWT is designed.The theo-retical calculations indicate that,under an electron beam voltage of 65 kV,a current of 10 A,a velocity as-pect ratio of 1,and a magnetic field strength of 4.19 T,the maximum output power can reach 90 kW with an efficiency of 13.8%and a saturation gain of 43 dB.When the input power is 10 W,the-3 dB band-width is 2 GHz.
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