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Experimental verification of a low-impedance transit-time oscillator without foils

Published online by Cambridge University Press:  25 September 2012

Yibing Cao ,
Juntao He ,
Jiande Zhang  and
Junpu Ling
Yibing Cao
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
Juntao He*
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
Jiande Zhang
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
Junpu Ling
Affiliation:
College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha, People's Republic of China
*
Address correspondence and reprint requests to: Juntao He, College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People's Republic of China. E-mail: hjt0731@163.com
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Abstract

The low-impedance transit-time oscillator without foils is a new high-power microwave generator. In a previous report, a radiation power of 2.7 GW at 1.64 GHz has been achieved and the corresponding power conversion efficiency is 18.75%. Recently, the further experiments are continued in our laboratory. By increasing the cathode-anode gap properly, the operating voltage of device is enhanced to about 628 kV, and the corresponding radiation power reaches 3.6 GW. The device efficiency approaches 23%. In the newest experiments, because of the higher power level, the radiation power has been obviously influenced by RF breakdown in the vicinity of the dielectric window. By using a plastic bag filled with sulfur-hexafluoride (SF6), such an influence can be minimized.

Keywords

High power microwaveLow-impedanceRF breakdownTransit-time
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 4 , December 2012 , pp. 613 - 619
Copyright
Copyright © Cambridge University Press 2012

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