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Absolute instability modes due to rescattering of stimulated Raman scattering in a large nonuniform plasma

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Abstract

Absolute instability modes due to secondary scattering of stimulated Raman scattering (SRS) in a large nonuniform plasma are studied theoretically and numerically. The backscattered light of convective SRS can be considered as a pump light with a finite bandwidth. The different frequency components of the backscattered light can be coupled to develop absolute SRS instability near their quarter-critical densities via rescattering process. The absolute SRS mode develops a Langmuir wave with a high phase velocity of about $c/\sqrt{3}$ with $c$ the light speed in vacuum. Given that most electrons are at low velocities in the linear stage, the absolute SRS mode grows with very weak Landau damping. When the interaction evolves into the nonlinear regime, the Langmuir wave can heat abundant electrons up to a few hundred keV via the SRS rescattering. Our theoretical model is validated by particle-in-cell simulations. The absolute instabilities may play a considerable role in the experiments of inertial confinement fusion.

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DOI:10.1017/hpl.2019.5

基金项目:The authors acknowledge useful discussions with C. Z. Xiao, R. Yan and C. Ren. This work was supported by the National Natural Science Foundation of China (Nos. 11775144 and 1172109) and the Natural Science Foundation of Shanghai (No. 19YF1453200).

收稿日期:2018-11-08

录用日期:2019-01-16

网络出版日期:2019-01-29

作者单位    点击查看

Yao Zhao:Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
Zhengming Sheng:Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, ChinaCollaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, ChinaSUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, UKTsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
Suming Weng:Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, ChinaCollaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
Shengzhe Ji:Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, China
Jianqiang Zhu:Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaCollaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China

联系人作者:Yao Zhao(yaozhao@siom.ac.cn)

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引用该论文

Yao Zhao, Zhengming Sheng, Suming Weng, Shengzhe Ji, and Jianqiang Zhu, "Absolute instability modes due to rescattering of stimulated Raman scattering in a large nonuniform plasma," High Power Laser Science and Engineering 7(1), e20 (2019)

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