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Yao, Yelei; Liu, Guo; Jiang, Wei; Wang, Weijie; Cao, Yingjian; Wang, Jianxun; Luo, Yong
IEEE transactions on electron devices, 11/2022, Letnik: 69, Številka: 11Journal Article
Periodical radiation spectrum with a frequency difference of ~160 MHz is observed in hot-test experiments of Ku-band gyrotron traveling-wave tubes (gyro-TWTs). By the means of eigenmode analyses and particle-in-cell (PIC) simulation considering the whole output transition section from the interaction circuit end to the output window, we found that the circuit oscillation is pronounced because of frequency self-modulation (FSM). As a comparison, the cutoff taper contributing to the FSM is removed and a new amplifier has been developed; hot-test results indicate that the periodical property has been greatly alleviated as expected and the stability of the amplifier is well improved.
