Observation and modelling of stimulated Raman scattering driven by an optically smoothed laser beam in experimental conditions relevant for shock ignition

0552234 - FZÚ 2022 RIV GB eng J - Článek v odborném periodiku
Cristoforetti, G. - Hüller, S. - Koester, P. - Antonelli, L. - Atzeni, S. - Baffigi, F. - Batani, F. - Baird, C. - Booth, N. - Galimberti, M. - Glize, K. - Héron, A. - Khan, M. - Loiseau, P. - Mancelli, D. - Notley, M. - Oliveira, P. - Renner, Oldřich - Šmíd, M. - Schiavi, A. - Tran, G. - Woolsey, N.C. - Gizzi, L.A.
Observation and modelling of stimulated Raman scattering driven by an optically smoothed laser beam in experimental conditions relevant for shock ignition.
High Power Laser Science and Engineering. Roč. 9, Oct (2021), č. článku e60. ISSN 2095-4719. E-ISSN 2052-3289
Grant CEP: GA MŠMT LTT17015
Výzkumná infrastruktura: ELI Beamlines III - 90141
Institucionální podpora: RVO:68378271
Klíčová slova: plasma simulations * shock ignition * stimulated Raman scattering * inertial confinement fusion * laser-plasma interaction
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 5.943, rok: 2021
Způsob publikování: Open access

We report results and modelling of an experiment performed at the Target Area West Vulcan laser facility, aimed at investigating laser–plasma interaction in conditions that are of interest for the shock ignition scheme in inertial confinement fusion (ICF), that is, laser intensity higher than 1016 W/cm2 impinging on a hot (T > 1 keV), inhomogeneous and long scalelength pre-formed plasma. Measurements show a significant stimulated Raman scattering (SRS) backscattering (∼ 4%−20% of laser energy) driven at low plasma densities and no signatures of two-plasmon decay (TPD)/SRS driven at the quarter critical density region. Results are satisfactorily reproduced by an analytical model accounting for the convective SRS growth in independent laser speckles, in conditions where the reflectivity is dominated by the contribution from the most intense speckles, where SRS becomes saturated.
Trvalý link: http://hdl.handle.net/11104/0327375