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Numerical simulation of spontaneous magnetic fields in laser produced plasma jet using MAG code

Published online by Cambridge University Press:  07 March 2001

O.V. DIYANKOV ,
I.V. GLAZYRIN ,
S.V. KOSHELEV  and
V.A. LIKOV
O.V. DIYANKOV
Affiliation:
Russian Federal Nuclear Center VNIITF, P.O. Box 245, Snezhinsk, Chelyabinsk region, 456770 Russia
I.V. GLAZYRIN
Affiliation:
Russian Federal Nuclear Center VNIITF, P.O. Box 245, Snezhinsk, Chelyabinsk region, 456770 Russia
S.V. KOSHELEV
Affiliation:
Russian Federal Nuclear Center VNIITF, P.O. Box 245, Snezhinsk, Chelyabinsk region, 456770 Russia
V.A. LIKOV
Affiliation:
Russian Federal Nuclear Center VNIITF, P.O. Box 245, Snezhinsk, Chelyabinsk region, 456770 Russia
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Abstract

The results of numerical simulation of spontaneous magnetic field generation and the influence of this field on laser produced plasma jet expansion in vacuum and low density gas are presented. The numerical simulation has been carried out using 2D MHD code for the case of an Al plate of 5 μm thickness irradiated by an Nd laser. The laser pulse duration was 0.5 ns at half-width, laser irradiation intensity was up to 1013 W/cm2 and laser focal spot diameter was about 100 μm. According to the received results, the magnetic field amplitude achieves the value of 150 kGs. This fact has no considerable influence on the temperature maximum in laser produced plasma, but significantly affects the process of the energy transport from plasma jet to low density gas. Shock wave generated magnetic field with reversal profile can be achieved in the case of plasma propagating into background gas.

Type
ZABABAKHIN SPECIAL PAPERS
Information
Laser and Particle Beams , Volume 18 , Issue 2 , April 2000 , pp. 255 - 260
Copyright
© 2000 Cambridge University Press

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