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Linear analysis of 170 GHz cylindrical and confocal gyrotron

Published online by Cambridge University Press:  17 August 2016

Youwei Yang  and
Sheng Yu
Youwei Yang*
Affiliation:
Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu 610054, China
Sheng Yu
Affiliation:
Terahertz Science and Technology Research Center, University of Electronic Science and Technology of China, Chengdu 610054, China
*
†Email address for correspondence: [email protected]
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Abstract

In this paper, the mode density, coupling coefficient, eigenfrequencies, quality factors and starting currents of a 170 GHz cylindrical and confocal gyrotron are studied based on the linear theory. Results show that the mode density in the confocal cavity greatly decrease due to the diffraction properties. Modes in the confocal cavity have lower quality factors than the modes in cylindrical cavity, hence the starting currents are higher than the latter. The confocal gyrotron is more stable than the cylindrical gyrotron when operating at large current. Meanwhile, through altering the mirror width, quality factors together with the starting current of the confocal modes are adjustable.

Type
Research Article
Information
Journal of Plasma Physics , Volume 82 , Issue 4 , August 2016 , 905820404
Copyright
© Cambridge University Press 2016 

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