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

作　　者：G.Cristoforetti P.Koester S.Atzeni D.Batani S.Fujioka Y.Hironaka S.Hüller T.Idesaka K.Katagiri K.Kawasaki R.Kodama D.Mancelli Ph.Nicolai N.Ozaki A.Schiavi K.Shigemori R.Takizawa T.Tamagawa D.Tanaka A.Tentori Y.Umeda A.Yogo L.A.Gizzi 

机构地区：[1]Intense Laser Irradiation Laboratory,INO-CNR,Pisa,Italy [2]Dipartimento SBAI,Universitàdi Roma‘La Sapienza’,Roma,Italy [3]UniversitéBordeaux,CNRS,CEA,CELIA,Talence,France [4]Institute of Laser Engineering,Osaka University,Osaka,Japan [5]Centre de Physique Théorique CPHT,CNRS,IP Paris,Ecole Polytechnique,Palaiseau,France [6]Graduate School of Engineering,Osaka University,Osaka,Japan [7]Institute of Plasma Physics and Lasers,Hellenic Mediterranean University Research Centre,Rethymnon,Greece [8]Institute for Integrated Radiation and Nuclear Science,Kyoto University,Sennan,Osaka,Japan

出　　处：《High Power Laser Science and Engineering》2023年第2期70-80,共11页高功率激光科学与工程（英文版）

基　　金：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).

摘　　要：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 3×10^(15)W/cm^(2).Experimental data suggest that high-energy electrons,with temperatures of 20–50 keV and conversion efficiencies ofη<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.

关 键 词：inertial confinement fusion laser plasma interaction parametric instabilities 

分 类 号：TL62[核科学技术—核技术及应用]