The Comparative Study of Gyro-TWT in Large-orbit and Small-orbit at Second Harmonic at Ka-band

This paper presents a comparative study of the gyro-TWT operating in large-orbit and small-orbit electron beam mode at Ka-band. Two tudes both work at second harmonic, which reduces the required magnetic field from 1.2T to 6000 Gauss, which can be generated using electromagnetic coils instead of superconducting magnets. By PIC simulation of the large-orbit gyro-TWT in TE
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-mode, the -3dB bandwidth of the gyro-TWT is 4.4GHz, the efficiency of the maximum peak output power is 22.9%, and the efficiency of the 3dB output power is 11.5%. By PIC simulation of the small-orbit gyro-TWT in TE
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-mode, the -3dB bandwidth of the gyro-TWT is 2.3GHz, the efficiency of the maximum peak output power is 13.3%, and the efficiency of the 3dB output power is 6.7%. Therefore, the gyro-TWT operating in the large-orbit electron beam mode at second harmonic has a broad application prospect.