Particle size effect on velocity of gold particle embedded laser driven plastic targets
1 Raja Ramanna Fellow, Physics Group, Bhabha Atomic Research Centre, Mumbai, India
2 High Pressure Physics and Synchrotron Radiation Division, Bhabha Atomic Research Centre
3 Radiation and Photochemistry Division, Bhabha Atomic Research Centre
4 Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland
5 PALS Research Centre, ASCR, Czech Republic
a e-mail: firstname.lastname@example.org
Published online: 15 November 2013
A scheme to enhance the target foil velocity has been investigated for a direct drive inertial fusion target. Polymer PVA (polyvinyl alcohol or (C2H4O)n) target foils of thickness 15–20 μm were used in plain form and also embedded with gold in the nano-particle (Au-np) or micro-particle (Au-mp) form. Nano-particles were of 20–50 nm and micro-particles of 2–3 μm in size. 17% higher target velocity was measured for foils embedded with nano-particle gold (Au-np) as compared to targets embedded with micro-particles gold (Au-mp). The weight of gold in both cases was in the range 40–55% of the full target weight (atomic percentage of about 22%). Experiments were performed with the single beam of the Prague Asterix Laser System (PALS) at 0.43 μm wavelength (3ω of the fundamental wavelength), 120 Joule energy and 300 psec pulse duration. Laser intensity on the target was about 1015 W/cm2. A simple model has been proposed to explain the experimental results.
© Owned by the authors, published by EDP Sciences, 2013
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.