High-Power Multifrequency Radiation Source Based on Gyro-TWT With External Coupling Feedback

In this article, we propose and measure a high-power Ku-band gyrotron traveling wave tube (gyro-TWT) with external coupling feedback to generate wide-band multifrequency signals. With varying the beam current, pitch factor, coupling coefficient, and feedback loop length, strong oscillations from sin...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2024-05, Vol.52 (5), p.1654-1660
Main Authors: Cao, Yingjian, Wang, Yu, Liu, Guo, Jiang, Wei, Yao, Yelei, Wang, Jianxun, Luo, Yong
Format: Article
Language:English
Subjects:
Couplings
Electron tubes
External coupling feedback
Feedback circuits
Gyrotron traveling wave tube (gyro-TWT)
Gyrotrons
multifrequency signals
Oscillators
Power generation
Reflection
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Summary:In this article, we propose and measure a high-power Ku-band gyrotron traveling wave tube (gyro-TWT) with external coupling feedback to generate wide-band multifrequency signals. With varying the beam current, pitch factor, coupling coefficient, and feedback loop length, strong oscillations from single-frequency to multifrequency regimes of the self-excitation TE11 mode are observed in the zero-driven state. Particle-in-cell (PIC) simulation shows the gyro-TWT can achieve a maximum output power of 192.86 kW and 56.67 MHz interval between main spectral components in the range of 14.85-17.46 GHz. It was confirmed by a proof-of-principle experiment based on a Ku-band gyro-TWT with an external feedback loop, which yielded 2.6 GHz multifrequency signals with an interval of 54 MHz and maximum output power of 174.25 kW at a duty cycle of 1%. The generated multifrequency radiation signals may have potential applications in microwave wireless communication, jamming of radar systems, and microwave frequency combs.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2024.3400219