Abstract
Two different excitation mechanisms of the frequency self-modulation (FSM) instability in a W-band dielectric-loaded gyrotron traveling-wave tube (gyro-TWT) were clearly revealed and explained. The FSM properties caused by the window reflection and collector ‘bottleneck’ versus operating beam current and pitch factor are respectively investigated. In order to solve the FSM instability, two improved gyro-TWT prototypes with broadband, low-reflection-level meta-surface window and a collector without ‘bottleneck’ were respectively fabricated and hot tested. The FSM excitation mechanism was well verified and excellent tube stability with a zero-driven signal was successfully achieved through our experiment.
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Acknowledgements
This paper is sponsored by the National Natural Science Foundation of China under Grant 61921002 and 62171100.
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G. L. wrote the main manuscript text. Y. W. prepared all the figures. G. L., Y. W., and Y. J. Cao performed the experimental measurement. G. L., W. J., and Y. Y. Yao carried out the design and simulation analysis. J. X. Wang and Y. Luo participated in the overall design, analysis, and discussion. All authors reviewed the manuscript.
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Liu, G., Wang, Y., Cao, Y. et al. Excitation and Suppression of the Frequency Self-Modulation Instability in a W-band Gyro-TWT. J Infrared Milli Terahz Waves 43, 905–919 (2022). https://doi.org/10.1007/s10762-022-00889-9
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DOI: https://doi.org/10.1007/s10762-022-00889-9