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Effects of diode current on high power microwave generation in a vircator

Published online by Cambridge University Press:  15 April 2009

GUOZHI LIU ,
WENHUA HUANG ,
HAO SHAO ,
SHI QIU ,
HONGJUN WANG ,
JINGYUE LIU ,
FENG WANG ,
ZHANFENG YANG  and
YONGZHI QIAO
GUOZHI LIU
Affiliation:
(shaohaonint@163.com)
WENHUA HUANG
Affiliation:
(shaohaonint@163.com)
HAO SHAO
Affiliation:
(shaohaonint@163.com)
SHI QIU
Affiliation:
(shaohaonint@163.com)
HONGJUN WANG
Affiliation:
(shaohaonint@163.com)
JINGYUE LIU
Affiliation:
(shaohaonint@163.com)
FENG WANG
Affiliation:
(shaohaonint@163.com)
ZHANFENG YANG
Affiliation:
(shaohaonint@163.com)
YONGZHI QIAO
Affiliation:
(shaohaonint@163.com)
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Abstract

An experiment of a virtual cathode oscillator (vircator) built on the low impedance intense electron beam accelerator Flash II is reported. A novel spectrum diagnosis method—a circulating dispersion line—is proposed. A thin oil layer coated graphite cathode is introduced in the experiment to decrease the delay time of the explosive emission process and obtain a homogeneous electron beam emission for improving the high-power microwave (HPM) generation efficiency. The effect of diode current on HPM generation in the vircator system is discussed. The HPM pulse width has a strong connection with the diode current waveform. For most shots, corresponding to the time that microwave emission starts, there is an inflection point in the diode current pulse. Compared with the case that no microwave is generated, the diode current increases more slowly following the inflection point. HPM generation terminates when the beam current reaches the self-pinching critical current of the diode.

Type
Papers
Information
Journal of Plasma Physics , Volume 75 , Issue 6 , December 2009 , pp. 787 - 798
Copyright
Copyright © Cambridge University Press 2009

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