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Time-resolved hard X-ray emission from a small plasma focus

Published online by Cambridge University Press:  09 March 2009

S.P. Moo  and
C.S. Wong
S.P. Moo
Affiliation:
Plasma Research Laboratory, Physics Department, University of Malaya, 59100 Kuala Lumpur, Malaysia
C.S. Wong
Affiliation:
Plasma Research Laboratory, Physics Department, University of Malaya, 59100 Kuala Lumpur, Malaysia
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Abstract

Some results of an experimental study of the hard X rays emitted from a 15-kV, 3-kJ plasma focus operated in argon are reported. The temporal evolution of the hard X rays detected by a plastic scintillator-photomultiplier detector and the voltage across the focus tube measured by a resistive voltage divider are simultaneously recorded on a two-channel digitizing oscilloscope. Metal absorbers of various thicknesses are used to provide some indications of the energies of the X rays. When the time delay of the detector system with respect to the anode voltage is taken into account, the hard X rays are observed to be emitted about 15 ns before the peak of the anode voltage and last for about 100 ns. There are two periods of emission, the X rays emitted in the first period being more intense, more energetic, and more directional than the X rays emitted in the second period. The X rays are attributed to the bombardment of the anode by energetic electrons generated in the pinch and the disruption phases of the focus.

Type
Regular Papers
Information
Laser and Particle Beams , Volume 13 , Issue 1 , March 1995 , pp. 129 - 134
Copyright
Copyright © Cambridge University Press 1995

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