Study of the spatial growth of stimulated Brillouin scattering in a gas-filled hohlraum via detecting the driven ion acoustic wave
作者机构：Laser Fusion Research CenterChina Academy of Engineering PhysicsMianyangSichuan 621900People’s Republic of China Institute of Applied Physics and Computational MathematicsBeijing 100094People’s Republic of China
出 版 物：《Matter and Radiation at Extremes》 (极端条件下的物质与辐射（英文）)
年 卷 期：2024年第9卷第2期
页 面：36-49页
核心收录：
学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 0803[工学-光学工程] 0702[理学-物理学]
基 金：supported by the Natural Science Foundation of China(Grant Nos.11905204,11975215,12105270,12205272,12205274,12275032,12275251,and 12035002) the Laser Fusion Research Center Funds for Young Talents(Grant No.RCFPD3-2019-6)
主 题：scattering filled Brillouin
摘 要：In an experiment performed on the Shenguang-III prototype laser facility, collective Thomson scattering (TS) is used to study the spatialgrowth of stimulated Brillouin scattering (SBS) in a gas-filled hohlraum by detecting the SBS-driven ion acoustic wave. High-quality timeresolved SBS and TS spectra are obtained simultaneously in the experiment, and these are analyzed by a steady-state code based on theray-tracing model. The analysis indicates that ion–ion collisions may play an important role in suppressing SBS growth in the Au plasma;as aresult, the SBS excited in the filled gas region is dominant. In the early phase of the laser pulse, SBS originates primarily from the high-densityplasma at the edges of the interaction beam channel, which is piled up by the heating of the interaction beam. Throughout the duration of thelaser pulse, the presence of the TS probe beam might mitigate SBS by perturbing the density distribution around the region overlapping withthe interaction beam.
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