Detailed investigations on double confocal waveguide for a gyro-TWT
Received:December 21, 2019  Revised:August 19, 2020  download
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Author NameAffiliationE-mail
ZHANG Chen Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China 2932433214@qq.com 
WANG Wei Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
SONG Tao Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
HUANG Jie Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
CAO Yi-Chao Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
LIU Di-Wei Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China dwliu212220@163.com 
HU Min Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
ZHANG Kai-Chun Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
WU Zhen-Hua Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
ZHOU-Jun Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
ZHONG Ren-Bin Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
ZHAO Tao Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
GONG Seng Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
LIU Sheng-Gang Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chendu 610054, China  
Abstract:The electromagnetic characteristics of the double confocal waveguide for a gyro-TWT is investigated in details. The eigenvalue and the field distribution of two kinds of steady-state modes in a double confocal waveguide, namely the superposition mode and the ring mode, are calculated with the scalar formulation of Huygens’ Principle, the theoretical results agree well with those from the commercial CST software. When the anti-phase superposition mode TE06 mode is chosen as an operating mode in a gyro-TWT, the diffractive loss of the potential parasitic modes is far greater than that of the operating mode. It means that the potential parasitic modes can be suppressed by means of its own diffractive loss in a double confocal waveguide. The mode density in a double confocal waveguide is higher than that in a single confocal waveguide, but far lower than that in a cylindrical waveguide. Compared to the single confocal waveguide, a higher beam-wave interaction efficiency can be obtained in the double confocal waveguide for a gyro-TWT, it is an appropriate choice to choose a double confocal waveguide as the beam-wave interaction structure in a gyro-TWT.
keywords:double confocal waveguide  gyro-TWT  Terahertz  superposition mode  ring mode
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Copyright:《Journal of Infrared And Millimeter Waves》