Design of quasi-optical mode converter for 140 GHz gyrotron

Wang Bin; He Hong; Liu Yunlong; Wang Hu

doi:10.11884/HPLPB201527.113002

Volume 27 Issue 11

Nov. 2015

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Article Navigation > High Power Laser and Particle Beams > 2015 > 27(11): 113002

Wang Ke, Duan Yantao, Shi Lihua, et al. A pulsed magnetic field sensor based on dual-loop differential structure[J]. High Power Laser and Particle Beams, 2022, 34: 043003. doi: 10.11884/HPLPB202234.210337

Citation:

Wang Bin, He Hong, Liu Yunlong, et al. Design of quasi-optical mode converter for 140 GHz gyrotron[J]. High Power Laser and Particle Beams, 2015, 27: 113002. doi: 10.11884/HPLPB201527.113002

Citation:

Wang Bin, He Hong, Liu Yunlong, et al. Design of quasi-optical mode converter for 140 GHz gyrotron[J]. High Power Laser and Particle Beams, 2015, 27: 113002. doi: 10.11884/HPLPB201527.113002

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Design of quasi-optical mode converter for 140 GHz gyrotron

doi: 10.11884/HPLPB201527.113002

Wang Bin^{1
,
,},
He Hong¹,
Liu Yunlong¹,
Wang Hu²

1.
College of Electronic Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;
2.
Institute of Oceanographic Instrumentation,Shandong Academy of Science,Qingdao 266001,China

Received Date: 2015-07-29
Rev Recd Date: 2015-09-21
Publish Date: 2015-10-27

Abstract

Abstract

This paper presents a high efficiency Denisov quasi-optical mode converter for 140 GHz, TE28,8 mode gyrotron. The mode converter includes a dimpled wall launcher and a mirror system. The mirror system consists of four mirrors, of which the first mirror is a quasi-parabolic one. A simulation code is developed based on the coupled mode theory and the vector diffraction theory. The simulation results show that the focal length of the parabolic mirror has a great effect on the vector Gaussian correlation coefficient. Therefore, it is important to select an appropriate focal length for the mirror system. The simulation results show that the scalar Gaussian correlation coefficient of the operating cavity mode to a fundamental Gaussian distribution on the window plane is about 98%, and the corresponding vector correlation coefficient is more than 90%.
- quasi-optical mode converter,
- gyrotron,
- mirror system,
- coupled mode theory

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