Abstract
Understanding hot electron generation and their spatial energy deposition in high density target are important for shock ignition (SI), an alternative inertial confinement fusion (ICF) concept achieving ignition by a strong converging shock launched by a high intensity laser spike. In recent experiments, moderately energetic (i100 keV) hot electrons generated by OMEGA-60 UV lasers enhanced the ablation pressure by 30% 1. Shock ignition with longer wavelength lasers was also proposed and discussed in theory 2. We have performed a series of experiments in both planer geometry with kilojoule scale OMEGA-EP lasers and spherical geometry with joint OMEGA-60/OMEGA-EP lasers to investigate hot electron generation and spatial energy deposition as the result of IR beam (2.6 kJ, 100 ps, intensity up to 1017 Wcm-2) interaction with SI-relevant long scalelength hot plasmas (1–3 keV, up to $450 \mu \mathrm {m})$.
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