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Enhancement of laser induced shock pressure in multilayer solid targets

Published online by Cambridge University Press:  06 March 2006

H.C. PANT
Affiliation:
High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, India
M. SHUKLA
Affiliation:
High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, India
H.D. PANDEY
Affiliation:
Centre for energy studies, Indian Institute of Technology, Hauz Khas, New Delhi, India
YOGESH KASHYAP
Affiliation:
High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, India
P.S. SARKAR
Affiliation:
High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, India
A. SINHA
Affiliation:
High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, India
V.K. SENECHAM
Affiliation:
Center for Advanced Technology, Indore, India
B.K. GODWAL
Affiliation:
High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai, India

Abstract

The impedance mismatch technique was used for shock pressure amplification in two layered planar foil targets. Numerical simulation results using one-dimensional (1D) radiation hydrocode MULTI in two layer target consisting of polyethylene (CH2)n-aluminium (Al) and polyethylene (CH2)n-gold (Au), show a pressure enhancement of 12 and 18 Mbar, respectively (or a pressure jump of 1.64 and 2.54, respectively), from initial pressure of 7 Mbar in the reference material (polyethylene) using laser intensity of 5 × 1013 Watts/cm2 at 1.064 μm. The simulation data was also corroborated by experiments in our laboratory. Results of laser driven shock wave experiments for pressure enhancement studies in CH2-Al and CH2-Au targets are also presented. A Nd:YAG laser chain (2 J, 1.064 μm wavelength, 200 ps pulse duration FWHM) is used for generating shocks in the planar CH2 foils of thickness varying from 4 to10 μm, and in two layered CH2-Al (or CH2-Au) targets with 8 μm CH2 and 1.5 μm Al or Au .

Type
Research Article
Copyright
© 2006 Cambridge University Press

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