Multibeam laser-plasma interaction at the Gekko XII laser facility in conditions relevant for direct-drive inertial confinement fusion

Year: 2023

Authors: Cristoforetti G., Koester P., Atzeni S., Batani D., Fujioka S., Hironaka Y., H’ller S., Idesaka T., Katagiri K., Kawasaki K., Kodama R., Mancelli D., Nicolai P., Ozaki N., Schiavi A., Shigemori K., Takizawa R., Tamagawa T., Tanaka D., Tentori A., Umeda Y., Yogo A., Gizzi LA.

Autors Affiliation: INO CNR, Intense Laser Irradiat Lab, Pisa, Italy; Univ Roma La Sapienza, Dipartimento SBAI, Rome, Italy; Univ Bordeaux, CNRS, CEA, CELIA, Talence, France; Osaka Univ, Inst Laser Engn, Osaka, Japan; Ecole Polytech, Ctr Phys Theor CPHT, CNRS, IP Paris, Palaiseau, France; Osaka Univ, Grad Sch Engn, Osaka, Japan; Hellen Mediterranean Univ Res Ctr, Inst Plasma Phys & Lasers, Rethimnon, Greece; Kyoto Univ, Inst Integrated Radiat & Nucl Sci, Osaka, Japan.

Abstract: Laser-plasma interaction and hot electrons have been characterized in detail in laser irradiation conditions relevant for direct-drive inertial confinement fusion. The experiment was carried out at the Gekko XII laser facility in multibeam planar target geometry at an intensity of approximately 3 x 10(15) W/cm(2). Experimental data suggest that high-energy electrons, with temperatures of 20-50 keV and conversion efficiencies of eta < 1%, were mainly produced by the damping of electron plasma waves driven by two-plasmon decay (TPD). Stimulated Raman scattering (SRS) is observed in a near-threshold growth regime, producing a reflectivity of approximately 0.01%, and is well described by an analytical model accounting 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. Journal/Review: HIGH POWER LASER SCIENCE AND ENGINEERING

Volume: 11      Pages from: e24-1  to: e24-11

More Information: This work was carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200 – EUROfusion). The views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The involved teams have operated within the framework of the Enabling Research Project: ENR-IFE.01.CEA Advancing shock ignition for direct-drive inertial fusion’. This work was also done with the support and under the auspices of the NIFS Collaboration Research program (2021NIFS18KUGK123).
KeyWords: inertial confinement fusion; laser plasma interaction; parametric instabilities
DOI: 10.1017/hpl.2023.13

Citations: 6
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