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Hard X-ray emission in laser-induced vacuum discharge

Published online by Cambridge University Press:  30 August 2005

YU.V. KOROBKIN ,
I.V. ROMANOV ,
A.A. RUPASOV ,
A.S. SHIKANOV ,
P.D. GUPTA ,
R.A. KHAN ,
S.R. KUMBHARE ,
A. MOORTI  and
P.A. NAIK
YU.V. KOROBKIN
Affiliation:
P.N. Lebedev Physical Institute, Moscow, Russia
I.V. ROMANOV
Affiliation:
P.N. Lebedev Physical Institute, Moscow, Russia
A.A. RUPASOV
Affiliation:
P.N. Lebedev Physical Institute, Moscow, Russia
A.S. SHIKANOV
Affiliation:
P.N. Lebedev Physical Institute, Moscow, Russia
P.D. GUPTA
Affiliation:
Centre for Advanced Technology, Indore, India
R.A. KHAN
Affiliation:
Centre for Advanced Technology, Indore, India
S.R. KUMBHARE
Affiliation:
Centre for Advanced Technology, Indore, India
A. MOORTI
Affiliation:
Centre for Advanced Technology, Indore, India
P.A. NAIK
Affiliation:
Centre for Advanced Technology, Indore, India
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Abstract

The dynamics of fast laser-induced vacuum discharge, with a rather small value of amplitude of current (≤ 10 kA), as well as the voltage and energy of the capacitor bank (≤ 20 kV and 20 J, respectively), have been investigated. It has been experimentally demonstrated that the initiations conditions determined by the energy and duration of the laser radiation, fundamentally determine the dynamics of the discharge. Two types of space and time separated plasma instabilities are revealed. It was found that the first of instabilities occurs at the initial stage of the discharge and is caused by a pinch structure, which takes place in front of a cathode jet extending in vacuum. The second type of instabilities arises at the top or recession of the current and is accompanied by the generation of hard (energy ≥100 keV) bremsstrahlung X-ray radiation from the anode area. The excess energy of the hard components of radiation over the potential of the current source is associated with the effects of plasma-erosive breaking.

Keywords

Laser triggeredPinch effectPlasma-erosive breakingVacuum dischargeX-ray emission
Type
Research Article
Information
Laser and Particle Beams , Volume 23 , Issue 3 , September 2005 , pp. 333 - 336
Copyright
© 2005 Cambridge University Press

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Footnotes

This paper was presented at the 28th ECLIM conference in Rome, Italy.

References

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