Experimental observation of parametric instabilities at laser intensities relevant for shock ignition
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Škorić, Miloš M.
Gizzi, L. A.
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We report measurements of parametric instabilities and hot electron generation in a laser intensity regime up to 6 x 10(15) W/cm(2), typical of the shock ignition approach to inertial fusion. Experiments performed at the PALS laboratory in Prague show that the incident laser energy losses are dominated by Stimulated Brillouin Scattering (SBS) rather than by Stimulated Raman Scattering (SRS) or Two-Plasmon Decay (TPD). Results are compared to hydrodynamics simulations using a code that includes self-consistent calculations of non-linear laser plasma interactions and accounts for the laser intensity statistics contained in the beam speckles. Good agreement is found for the backscattered SRS light, and for temperature and flux of hot electrons. The effect of high-intensity speckles on backscattered SRS is also underlined numerically and experimentally. Copyright (C) EPLA, 2017
Source:Europhysics Letters / EPL, 2017, 117, 3
- EUROfusion - Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium (EU-633053)
- European Union, COST Action [MP1208], Czech Ministry of Education, Youth and Sports [LC528, LM2010014], Italian MIUR [PRIN 2012AY5LEL], Sapienza project [C26A15YTMA], European Regional Development Fund [CZ.02.1.01/0.0/0.0/15008/0000162]