Research on Low-Frequency Oscillations Caused by Outgassing from Attenuated Dielectric

In this paper, stray electrons generated by outgassing from attenuated dielectric in the experimental measurement of W-band gyro-TWT are analyzed. The characteristics of stray electrons, such as trajectory and the frequency of low-frequency oscillations (LFOs), are simulated and discussed. The results are in good agreement with the experimental results. On this basis, the root of the instability of the whole tube performance in the test experiment is found, and it has important guiding significance for the follow-up project to put forward effective methods to suppress LFOs.