Experimental observation of parametric instabilities at laser intensities relevant for shock ignition

Year: 2017

Authors: Cristoforetti G., Colaitis A., Antonelli L., Atzeni S., Baffigi F., Batani D., Barbato F., Boutoux G., Dudzak R., Koester P., Krousky E., Labate L., Nicolaı Ph, Renner O., Skoric M., Tikhonchuk V., Gizzi LA.

Autors Affiliation: CNR, INO, Intense Laser Irradiat Lab, Pisa, Italy; Univ Bordeaux, CNRS, CEA, CELIA Ctr Lasers Intenses & Applicat, Talence, France; Univ Roma La Sapienza, Dipartimento SBAI, Rome, Italy; Natl Res Nucl Univ MEPhI, Dept Plasma Phys, Moscow, Russia; Empa Swiss Fed Labs Mat Sci & Technol, Dubendorf, Switzerland; Prague Asterix Laser Syst, Prague, Czech Republic; ASCR, Inst Phys & ELI Beamlines, Prague, Czech Republic; Vinca Inst Nucl Sci, Belgrade, Serbia.

Abstract: We report measurements of parametric instabilities and hot electron generation in a laser intensity regime up to 6 × 1015W/cm2, 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.

Journal/Review: EUROPHYSICS LETTERS

Volume: 117 (3)      Pages from: 35001-1  to: 35001-6

More Information: This work was supported by the European Union under the Laserlab program of the 7th FP and the COST Action MP1208, by the Czech Ministry of Education, Youth and Sports, projects LC528 and LM2010014, by the Italian MIUR (contract PRIN 2012AY5LEL), by the EUROfusion Consortium (grant agreement 633053), by the Sapienza project C26A15YTMA and by the ELI project CZ.02.1.01/0.0/0.0/15008/0000162 from European Regional Development Fund. SciTech Precision supplied targets. The authors are grateful the PALS staff for help in running the experiments.
KeyWords: Stimulated Raman-scattering; Inertial Confinement Fusion; Simulation; Emission; Plasmas; Light; Code
DOI: 10.1209/0295-5075/117/35001

Citations: 22
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