A Water-Based Lossy Waveguide With High Attenuation Used in High Power Gyro-TWT

Insufficient attenuation and poor heat dissipation in the beam-wave interaction section are critical limitations in developing the megawatt-level gyrotron traveling wave tube (gyro-TWT). To solve these problems, we propose a water-based lossy waveguide with high attenuation and heat dissipation in t...

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Bibliographic Details
Published in:IEEE electron device letters 2024-07, Vol.45 (7), p.1325-1328
Main Authors: Wang, Weijie, Cao, Yingjian, Liu, Guo, Yao, Yelei, Jiang, Wei, Wang, Jianxun, Luo, Yong
Format: Article
Language:English
Subjects:
Attenuation
Ceramics
dielectric
Dielectric losses
Dissipation
gyrotron travelling wave tube (gyro-TWT)
heat dissipation
high loss
Microwave antennas
Permittivity
Temperature measurement
Thermal conductivity
Traveling wave tubes
Traveling waves
Water-based
Wave interaction
Waveguides
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Summary:Insufficient attenuation and poor heat dissipation in the beam-wave interaction section are critical limitations in developing the megawatt-level gyrotron traveling wave tube (gyro-TWT). To solve these problems, we propose a water-based lossy waveguide with high attenuation and heat dissipation in this letter. It comprises a vacuum region, a lossless BeO ceramic, and flowing water. Measured results indicate that the proposed structure can achieve an attenuation higher than 10dB/cm at 15.5-17.0GHz. The maximum attenuation at 16.3GHz can even exceed 29dB/cm. It is sufficient to suppress oscillations at large currents. In addition, the flowing water has a higher power capacity than conventional lossy dielectric. The proposed structure paves the way for the development of megawatt gyro-TWTs.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2024.3406706