Multibeam Laser Plasma Interaction at Gekko XII laser facility in conditions relevant for Direct-Drive Inertial Confinement Fusion
Abstract
Laser Plasma Interaction and hot electrons have been characterized in detail in laser irradiation conditions relevant for direct-drive Inertial Confinement F usion. T he e xperiment h as b een carried out at Gekko XII laser facility in multibeam planar geometry at intensity ∼ 3 • 10 15 W/cm 2. Experimental data suggest that high-energy electrons, with temperature 20-50 keV and conversion efficiencies η < 1% , we re ma inly pr oduced by th e da mping of el ectron pl asma wa ves dr iven by Two Plasmon Decay. Stimulated Raman Scattering is observed in a near-threshold growth regime, producing a reflectivity o f ∼ 0 .01%, a nd i s w ell d escribed b y a n a nalytical m odel a ccounting for the convective growth in independent speckles. The experiment reveals that both TPD and SRS are collectively driven by multiple beams resulting in a more vigorous growth than that driven by single-beam laser intensity.
Domains
Physics [physics]
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