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Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

Published online by Cambridge University Press:  28 November 2012

Yongfu Tang ,
Lin Meng ,
Hailong Li ,
Ling Zheng ,
Bin Wang  and
Feina Zhang
Yongfu Tang*
Affiliation:
School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan, China
Lin Meng
Affiliation:
School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan, China
Hailong Li
Affiliation:
School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan, China
Ling Zheng
Affiliation:
School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan, China
Bin Wang
Affiliation:
School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan, China
Feina Zhang
Affiliation:
School of Physical Electronics, University of Electronic Science and Technology of China Chengdu, Sichuan, China
*
Address correspondence and reprint requests to: Yongfu Tang, 435, Yifu Building, No. 4, Section 2, North Jianshe Road, Chengdu, Sichuan, Peoples Republic of China. E-mail: yongfu.tang@gmail.com
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Abstract

A dual-band high-efficiency coaxial relativistic backward wave oscillator (CRBWO) with asymmetric resonant reflector is designed and presented in this paper. Improved sectioned coaxial slow wave structure (SWS) with stepwise variation of coupling impedance and phase velocity is employed, and the performance of the dual-band CRBWO is investigated by use of a 2.5-D particle-in-cell (PIC) simulation code. When the diode voltage is 510 kV and beam current is 9.03 kA, an average microwave power of 1.0 GW with power conversion efficiency of 21.7% is obtained. Synchronously radiating dual-band frequencies of 8.1 GHz and 9.9 GHz are obtained, corresponding to C-band and X-band, respectively. A more clear and stable beating radiation microwave power with beating frequency of 1.8 GHz is acquired.

Keywords

Coaxial relativistic backward wave oscillatorDual-bandHigh-efficiencyImproved slow wave structurePIC simulation
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 1 , March 2013 , pp. 55 - 62
Copyright
Copyright © Cambridge University Press 2012

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