Dhareshwar, L. J.; Chaurasia, S.; Manmohan, K.; Badziak, J.; Wolowski, J.; Kasperczuk, A.; Pisarczyk, T.; Ryc, L.; Rosinski, M.; Parys, P.; Pisarczyk, P.; Ullschmidt, J.; Krousky, E.; Masek, K. (HP&SRPD;RPCD)
Source
EPJ Web of Conferences, 2013. Vol. 59: Article no. 03015
ABSTRACT
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 μmwere used in plain form and also embedded with gold in the nano-particle (Au-np) or micro-particle (Au-mp) form. Nanoparticles 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 1015W/cm2. A simple model has been proposed to explain the experimental results.