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Generation of beating wave by multi-coaxial relativistic backward wave oscillator

Published online by Cambridge University Press:  19 September 2013

Y. Teng ,
T.Z. Liang  and
J. Sun
Y. Teng*
Affiliation:
Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, People's Republic of China
T.Z. Liang
Affiliation:
Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, People's Republic of China
J. Sun
Affiliation:
Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, People's Republic of China
*
Address correspondents and reprint requests to: Y. Teng, Northwest Institute of Nuclear Technology, Xi'an, Shaanxi, People's Republic of China. E-mail: ganlong1982@foxmail.com
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Abstract

Multi-coaxial relativistic backward wave oscillator that generates the beating wave of high power microwave pulse driven by a single accelerator and a single guiding magnet system is presented. Making use of the coaxial annular cathodes that can synchronously produce three annular beams at one shot, the average power of 5.88 GW consisting of two frequency components 9.0 and 9.7 GHz is obtained under the diode voltage and current 724 and 19.57 kA, corresponding to the conversion efficiency 41.5%. The conversion efficiency and the beating frequency are considerably stable with the diode voltage. The coaxial transmission supporter developed from our previous experimental research is employed to conductively connect the coaxial structure and to incoherently combine the microwave pulse of two frequencies with little reflection. It is found that the equipotential connection of the coaxial structure modifies the field distribution in the diode structure to facilitate the operation of the coaxial annular cathodes. The coaxial cathodes of different lengths are proved to be efficient at depressing the space charge effect in order to prevent the explosive emission of the inner cathode from being shielded by the outer annular beams.

Keywords

Beating waveCoaxial annular cathodesCoaxial relativistic backward wave oscillatorHigh conversion efficiencyHigh power microwave
Type
Research Article
Information
Laser and Particle Beams , Volume 31 , Issue 4 , December 2013 , pp. 703 - 714
Copyright
Copyright © Cambridge University Press 2013 

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