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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 ,
M. SHUKLA ,
H.D. PANDEY ,
YOGESH KASHYAP ,
P.S. SARKAR ,
A. SINHA ,
V.K. SENECHAM  and
B.K. GODWAL
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
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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 .

Keywords

Equation of state (EOS). Pressure amplificationShock pressure
Type
Research Article
Information
Laser and Particle Beams , Volume 24 , Issue 1 , March 2006 , pp. 169 - 174
Copyright
© 2006 Cambridge University Press

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