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Current sheath studies in a co-axial plasma focus gun

Published online by Cambridge University Press:  13 March 2009

S. P. Chow ,
S. Lee  and
B. C. Tan
S. P. Chow
Affiliation:
Physics Department, University of Malaya, Kuala Lumpur, Malaysia
S. Lee
Affiliation:
Physics Department, University of Malaya, Kuala Lumpur, Malaysia
B. C. Tan
Affiliation:
Physics Department, University of Malaya, Kuala Lumpur, Malaysia
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Abstract

A co-axial plasma focus device is operated in deuterium gas at ambient pressures from 0·2 to 0·7 mm Hg and condenser bank voltages from 10 to 22 kV. Magnetic probing reveals an axisymmetric parabolic current sheath which propagates down the co-axial tube (steady propagation region) and collapses off the end of the co-axial gun forming a dense plasma focus. The state of the plasma just before the focusing action is very much dependent on the velocity in the steady propagation region. This velocity is experimentally studied and compared with a snow- plough theory. The collapsing phase of the current sheath is studied using high speed framing photography and current and voltage measurements. The results indicate a focus of length 1·5 cm and radius less than 1·7 mm.

Type
Research Article
Information
Journal of Plasma Physics , Volume 8 , Issue 1 , August 1972 , pp. 21 - 31
Copyright
Copyright © Cambridge University Press 1972

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References

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