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Observation of a U-like shaped velocity evolution of plasma expansion during a high-power diode operation

Published online by Cambridge University Press:  24 July 2014

Dan Cai*
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan, China
Lie Liu
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan, China
Jinchuan Ju
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan, China
Xuelong Zhao
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan, China
Yongfeng Qiu
Affiliation:
College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan, China
*
Address correspondence and reprint requests to: Dan Cai, College of Optoelectric Science and Engineering, National University of Defense Technology, Hunan 410073, China. E-mail: 263277440@163.com

Abstract

The diode closure velocity has been investigated in pulsed high-power diodes operating with the mode of space-charge-limed bipolar flow. A combination of time-resolved electrical and optical diagnostics has been employed to study the basic phenomenon of the temporal and spatial evolutions of the diode plasmas. The results from the two diagnostics were compared. Since anode plasma rapidly expands, the diode closure speed vd increases in the end of the current pulse. The diode closure speed vd can be divided into three stages with a U-like whole shape. The obtained results can be used in various applications, for instance, the high-power microwave sources, electron-beam plasma heating, and material treating.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2014 

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