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A Stable 0.2-THz Coaxial-Waveguide Gyrotron Traveling-Wave-Tube Amplifier with Distributed Losses

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Abstract

For high-power operation, a THz gyrotron traveling-wave-tube (gyro-TWT) amplifier must operate in a high-order waveguide mode to enlarge the transverse dimension of an interaction waveguide. However, a gyro-TWT amplifier operating in a high-order waveguide mode is susceptible to spurious oscillations. To improve the device stability, in this study, we investigate the possibility of using a coaxial waveguide with distributed losses as the interaction structure. For the same required attenuation, all threatening oscillating modes can be suppressed using different combinations of losses of inner and outer cylinders. This provides flexibility in designing distributed losses when considering the ohmic loading of the interaction structure. We predict that the 0.2-THz gyro-TWT can stably produce a peak power of 14 kW with an efficiency of 23 %, a 3-dB bandwidth of 3.5 GHz, and a saturated gain of 50 dB for a 20-kV 3-A electron beam with a 5 % velocity spread and 1.0 velocity ratio.

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Acknowledgments

The authors would like to thank the National Science Council of the Republic of China, Taiwan, for financially supporting this research under Contract MOST 103-2221-E-346-001 and MOST 104-2221-E-346-001. We are grateful to the National Center for High-performance Computing for computer time and facilities.

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Authors and Affiliations

  1. Department of Communication Engineering, National Penghu University of Science and Technology, Penghu, 880, Taiwan

    C. L. Hung

  2. Department of Electro-Optical Engineering, Southern Taiwan University of Science and Technology, Tainan, 710, Taiwan

    Y. S. Yeh

  3. Department of Physics, National Tsing Hua University, Hsinchu, 300, Taiwan

    T. H. Chang

  4. Graduate Institute of Electrical Engineering and Computer Science, National Penghu University of Science and Technology, Penghu, 880, Taiwan

    R. S. Fang

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  1. C. L. Hung
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  2. Y. S. Yeh
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  3. T. H. Chang
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Correspondence to C. L. Hung.

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Hung, C.L., Yeh, Y.S., Chang, T.H. et al. A Stable 0.2-THz Coaxial-Waveguide Gyrotron Traveling-Wave-Tube Amplifier with Distributed Losses. J Infrared Milli Terahz Waves 38, 1–11 (2017). https://doi.org/10.1007/s10762-016-0302-9

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  • DOI: https://doi.org/10.1007/s10762-016-0302-9

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