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Study on a Depressed Collector for a 75 GHz Low-Voltage Compact Gyrotron for Industrial Application

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Abstract

The low-voltage compact gyrotron is suitable for industrial applications. However, the beam-wave interaction efficiency is low in conventional low-voltage gyrotron. To improve the whole tube efficiency, a compact depressed collector is introduced in developing a 75 GHz low-voltage compact gyrotron. The compact depressed collector is directly connected to the output waveguide. It is grounded and isolated with the cavity by a ceramic ring which is easy to be connected with the application system. The design of the original tube electron beam voltage and electron beam current are 10 kV and 1.2 A. In the particle-in-cell (PIC) simulation, the operating mode is TE0,1 and the generated power is 1.2 kW operated at the frequency of 75.5 GHz, which corresponds to an electron efficiency of 10%. When the depressed collector is performed and the electron reflux is under 5%, the efficiency of the whole tube can reach 30%, and when the reflux rate is controlled at about 15%, the efficiency of the whole tube can reach 50%. The dissipation power would be sufficiently reduced.

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Funding

This work was supported by the National Natural Science Foundation of China under Grant 61971097, the National Key Research and Development Program of China under 2019YFA0210202, the Sichuan Science and Technology Program under Grant 2018HH0136, and the Terahertz Science and Technology Key Laboratory of Sichuan Province Foundation under Grant THZSC201801.

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Authors and Affiliations

  1. Terahertz Science and Technology Key Laboratory of Sichuan Province, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China

    Dun Lu, Wenjie Fu, Xiaotong Guan, Tongbin Yang & Yang Yan

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  1. Dun Lu
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  2. Wenjie Fu
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  3. Xiaotong Guan
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  4. Tongbin Yang
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  5. Yang Yan
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Correspondence to Wenjie Fu.

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Lu, D., Fu, W., Guan, X. et al. Study on a Depressed Collector for a 75 GHz Low-Voltage Compact Gyrotron for Industrial Application. J Infrared Milli Terahz Waves 42, 211–219 (2021). https://doi.org/10.1007/s10762-020-00761-8

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