Design of 170 GHz TE<sub>25，10</sub> mode quasi-optical mode converter for MW-level gyrotrons

doi:10.11972/j.issn.1001-9014.2023.03.009

Home > Archive>Volume 42, Issue 3, 2023 >350-355. DOI:10.11972/j.issn.1001-9014.2023.03.009

Design of 170 GHz TE25，10 mode quasi-optical mode converter for MW-level gyrotrons
DOI:
                        10.11972/j.issn.1001-9014.2023.03.009
                    
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                        CHEN PuCHEN Pu
National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China
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ZENG XuZENG Xu
National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China
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ZHANG Yi-ChiZHANG Yi-Chi
National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China
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GAO Dong-ShuoGAO Dong-Shuo
National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China
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FENG Jin-JunFENG Jin-Jun
National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China
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Affiliation:National Key Laboratory of Science and Technology on Vacuum Electronics， Beijing Vacuum Electronics Research Institute， Beijing 100015， China
Clc Number:TN129
Fund Project:Supported by National Key Researchand Development Program of China （2017YFE0300203）

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Abstract:

In order to meet the requirements of high-power output and high-efficiency transmission of the 170 GHz gyrotron for fusion， it is necessary to convert the operating mode of TE_25，10 to a Gaussian beam for output. In response to this technical requirement， based on the vector diffraction theory， geometric optics， coupled wave theory， and phase correction algorithm， a 170 GHz， TE_25，10 mode high-efficiency quasi-optical mode converter was designed using a numerical calculation program. The mode converter consists of a Denisov launcher， a parabolic mirror， a quasi-elliptical mirror， and a phase correction mirror. Using Surf3D software and commercial simulation software FEKO for simulation calculation， the energy conversion efficiency of the designed quasi-optical mode converter is about 95.2%， the beam scalar Gaussian content is about 97.6%， and the vector Gaussian content is about 91.8%， reaching the application of gyrotron requirement.

Key words:gyrotron;mode converter;quasi-optical technology;Denisov launcher;170 GHz

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CHEN Pu, ZENG Xu, ZHANG Yi-Chi, GAO Dong-Shuo, FENG Jin-Jun. Design of 170 GHz TE_25，10 mode quasi-optical mode converter for MW-level gyrotrons[J]. Journal of Infrared and Millimeter Waves,2023,42(3):350~355

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Received:October 19,2022
Revised:April 09,2023
Adopted:December 06,2022
Online: March 30,2023
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