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Home > Archive>Volume 41, Issue 3, 2022 >557-562. DOI:10.11972/j.issn.1001-9014.2022.03.006
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Design of a quasi-optical mode converter for a 170 GHz gyrotron
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1.Key Laboratory of High Power Microwave Sources and Technologies，Aerospace Information Research Institute， Chinese Academy of Sciences， Beijing 101400， China;2.University of Chinese Academy of Sciences， Beijing 100049， China;3.Hisense Mobile Communication Technology Co.， Ltd. Qingdao 266555， China

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TN12

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Supported by the National Natural Science Foundation of China（61571418，61531002）

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    Abstract:

    A high efficiency Denisov-type quasi-optical mode converter for a 170 GHzmode gyrotron is presented. The mode converter comprises a dimpled-wall launcher and a mirror system. Based on the coupled mode theory， the advanced launcher having two stages of perturbations is investigated. A mirror system of the converter is optimized and designed by using the vector diffraction theory. Simulation results show that the good Gaussian mode is converted from the circular waveguide mode and the mode conversion efficiency of a quasi-optical mode converter is 93.7%.

    Reference
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    [2] Denisov G G ， Litvak A G ， Myasnikov V E ， et al . Development in Russia of high power gyrotrons for fusion [J]. Nuclear Fusion， 2008， 48（5）：463-470. 10.1088/0029-5515/48/5/054007
    [3] Bogdashov A A ， Chirkov A V ， Denisov G G ， et al . High-efficient mode converter for ITER gyrotron [J]. Int. J. Infrared Millim. Waves， 2005， 26（6）： 771–785. 10.1007/s10762-005-5651-8
    [4] Glyavin M Y ， Ginzburg N S ， Goldenberg A L ， et al . THz Gyrotrons： Status and possible optimizations [J]. Terahertz Sci. Technol， 2012， 5（2）： 67–77.
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    [7] Prinz O ， Arnold A . Highly Efficient Quasi-Optical Mode Converter for a Multifrequency High-Power Gyrotron [J]. IEEE Trans. Electron Devices， 2009， 56（5）：828-834. 10.1109/TED.2009.2015819
    [8] Vlasov S N ， Orlova I M . Quasioptical transformer which transforms the waves in waveguide having a circular cross-section into a highly-directional wave beam [J]. Radio Phys. Quantum Electron， 1974， 17（1）：115–119. 10.1007/BF01037072
    [9] Kartikeyan M V ， Borie E ， Thumm M . Gyrotrons： high powe r microwave and millimeter wave technology [J]. Advanced Texts in Physics， 2004 . 10.1007/978-3-662-07637-8
    [10] Bian Hui-QI ， Du Chao-Hai ， Pan Shi ， et al . Design and analysis of broadband quasi-optical mode converter with a Denisov launcher [J].Journal of Infrared Millimeter Waves， 2020， 39（5）： 567-575.
    [11] Bogdashov A A ， Denisov G G . Asymptotic theory of high-efficiency converters of higher-order waveguide modes into eigenwaves of open mirror lines [J]. Radiophysics and Quantum Electronics， 2004， 47（4）：283-296 . 10.1023/B:RAQE.0000047649.17664.6e
    [12] Thumm M ， Cairns R A ， Phelps A .D.R. Modes and mode conversion in microwave devices in Generation and Application of High Power Microwaves[M]. Eds. Bristol， U.K.： IOP， 1997， 121–171.
    [13] Jin Jian-bo ， Piosczyk B ， Thumm M ， Rzesnicki T ， et al . Quasi-Optical mode converter/mirror system for a high-power coaxial-cavity gyrotron [J]. IEEE Trans. Plasma Sci.， 2006， 34（4）： 1–8. 10.1109/tps.2006.877627
    [14] Blank M ， Kreischer K ， Temkin R J . Theoretical and experimental investigation of a quasi-optical mode converter for a 110-GHz gyrotron [J]. IEEE Trans. Plasma Sci.， 1996， 24（3）： 1058–1066. 10.1109/27.533113
    [15] Wang Bin ， Liu Yun-long ， Wang Hu ， et al . Denisov-type quasi-optical mode converter for high-order asymmetric volume mode gyrotron [J]. High Power Laser and Particle Beams， 2016， 28（7）： 0730051-0730058.
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XU Shou-Xi, YANG Jie, WANG Hu, GENG Zhi-Hui, ZHANG Rui. Design of a quasi-optical mode converter for a 170 GHz gyrotron[J]. Journal of Infrared and Millimeter Waves,2022,41(3):557~562

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History
  • Received:April 07,2021
  • Revised:January 17,2022
  • Adopted:May 24,2021
  • Online: January 17,2022
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