L J Dhareshwar
Articles written in Pramana – Journal of Physics
Volume 75 Issue 6 December 2010 pp 1191-1196 Conributed Papers
Laser interaction with low-density carbon foam
S Chaurasia S Tripathi D S Munda G Mishra C G Murali N K Gupta L J Dhareshwar A K Rossall G J Tallents Rashmi Singh D K Kohli R K Khardekar
Experiments were performed with a 15 J/500 ps Nd:glass laser ($\lambda = 1064$ nm) focussed to an intensity > 1014 W/cm2 . X-ray emissions from carbon foam and 5% Pt-doped carbon foam of density 150–300 mg/cc were compared with that of the solid carbon targets. The thickness of the carbon foam was 15 𝜇m on a graphite substrate. X-ray emission was measured using semiconductor X-ray diodes covered with various filters having transmissions in different X-ray spectral ranges. It covered X-ray spectrum of 0.8–8.5 keV range. The X-ray emission in the soft X-ray region was observed to increase to about 1.8 times and 2.3 times in carbon foam and Pt-doped foam, respectively with respect to solid carbon. In hard X-rays, there was no measurable difference amongst the carbon foam, Pt-doped carbon foam and solid carbon. Scanning electron microscope (SEM) analysis demonstrates that foam targets smoothens the crater formed by the laser irradiation.
Volume 79 Issue 6 December 2012 pp 1471-1483
S Tripathi S Chaurasia P Leshma L J Dhareshwar
The main aim of the study of thin target foil–laser interaction experiments is to understand the physics of hydrodynamics of the foil acceleration, which is highly relevant to inertial confinement fusion (
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