Study of the spatial growth of stimulated Brillouin scattering in a gas-filled Hohlraum via detecting the driven ion acoustic wave

IF 4.8 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Matter and Radiation at Extremes Pub Date : 2024-01-02 DOI:10.1063/5.0173023

Chaoxin Chen, Tao Gong, Zhichao Li, Liang Hao, Yonggang Liu, Xiangming Liu, Hang Zhao, Yaoyuan Liu, Kaiqiang Pan, Qi Li, Sanwei Li, Zhijun Li, Sai Jin, Feng Wang, Dong Yang

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Abstract

In an experiment performed on the Shenguang-III prototype laser facility, collective Thomson scattering (TS) is used to study the spatial growth of stimulated Brillouin scattering (SBS) in a gas-filled Hohlraum by detecting the SBS-driven ion acoustic wave. High-quality time-resolved SBS and TS spectra are obtained simultaneously in the experiment, and these are analyzed by a steady-state code based on the ray-tracing model. The analysis indicates that ion–ion collisions may play an important role in suppressing SBS growth in the Au plasma; as a result, the SBS excited in the filled gas region is dominant. In the early phase of the laser pulse, SBS originates primarily from the high-density plasma at the edges of the interaction beam channel, which is piled up by the heating of the interaction beam. Throughout the duration of the laser pulse, the presence of the TS probe beam might mitigate SBS by perturbing the density distribution around the region overlapping with the interaction beam.

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通过探测驱动离子声波研究充满气体的霍姆腔中受激布里渊散射的空间增长情况

在 "神光三号 "原型激光设备上进行的一项实验中，通过探测受激布里渊散射（SBS）驱动的离子声波，利用集合汤姆逊散射（TS）来研究充满气体的霍室中受激布里渊散射（SBS）的空间增长。实验中同时获得了高质量的时间分辨 SBS 和 TS 光谱，并通过基于射线追踪模型的稳态代码对其进行了分析。分析表明，离子-离子碰撞可能在抑制金等离子体中的 SBS 生长方面发挥了重要作用；因此，在填充气体区域激发的 SBS 占主导地位。在激光脉冲的早期阶段，SBS 主要来自相互作用光束通道边缘的高密度等离子体，这些等离子体是由相互作用光束加热堆积而成的。在整个激光脉冲持续期间，TS 探头光束的存在可能会扰动与相互作用光束重叠区域周围的密度分布，从而缓解 SBS。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Matter and Radiation at Extremes Physics and Astronomy-Atomic and Molecular Physics, and Optics

CiteScore

8.60

自引率

9.80%

发文量

160

审稿时长

15 weeks

期刊介绍： Matter and Radiation at Extremes (MRE), is committed to the publication of original and impactful research and review papers that address extreme states of matter and radiation, and the associated science and technology that are employed to produce and diagnose these conditions in the laboratory. Drivers, targets and diagnostics are included along with related numerical simulation and computational methods. It aims to provide a peer-reviewed platform for the international physics community and promote worldwide dissemination of the latest and impactful research in related fields.