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Ultrahigh-Speed Camera Study of a Plasma Source for a Repetitive and Miniature POS

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4 Author(s)
Kumar, Rajesh ; Dept. of Electron. & Electr. Eng., Loughborough Univ., Loughborough ; Novac, B.M. ; Smith, I.R. ; Greenwood, C.

The plasma opening switch (POS) is the fastest opening switch available for use in high-power pulsed systems. The present study reported in this paper arose during the development of a compact and repetitive radiation generator, in which a POS is to be used to produce very fast rising high-voltage multi gigawatt pulses. Since the present POS requires a relatively low opening current, which is about 50 kA with a rise time of about 50 ns, a careful study was required to ensure that the proper plasma conditions (such as density and velocity) were generated by the simultaneous operation of a number of plasma guns. Initially, a Faraday cup-based technique established accurately most of the plasma parameters produced by a single gun (density:1013 cm-3 ; velocity: 2.2 cm/mus ). However, an optical study, which is mainly based on picture frames taken by an ultrahigh-speed camera, was also necessary to obtain the overall dynamics of the plasma generated by a set of four guns. Principle results are presented.

Published in:

Plasma Science, IEEE Transactions on  (Volume:36 ,  Issue: 4 )

Date of Publication:

Aug. 2008

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