Numerical model for linear stimulated Raman scattering in inhomogeneous plasmas

被引:1
|
作者
Yao, Weibo [1 ]
Wang, Qing [2 ]
Tan, Shang [1 ]
Chen, Yong [3 ]
Xiao, Chengzhuo [1 ,4 ]
机构
[1] Hunan Univ, Sch Phys & Elect, Changsha 410082, Peoples R China
[2] Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China
[3] Anhui Univ Sci & Technol, Sch Elect & Informat Engn, Huainan 232001, Anhui, Peoples R China
[4] Shanghai Jiao Tong Univ, Collaborat Innovat Ctr IFSA CICIFSA, Shanghai 200240, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
ABSOLUTE PARAMETRIC-INSTABILITIES; BRILLOUIN-SCATTERING; THRESHOLDS; TURBULENCE; DRIVEN;
D O I
10.1063/5.0178201
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
Numerical model for calculating convective gains and absolute thresholds of stimulated Raman scattering (SRS) in inhomogeneous plasmas is constructed based on the Fourier-space method. The model is valid for arbitrary density profiles and scattering geometries, including both backscattering and side scattering. It is shown that 90 deg side scatter has a lower absolute threshold than other scattering geometries. Backscatter, on the other hand, has a relatively large absolute threshold under conventional direct-drive ignition conditions. For a parabolic density profile, the absolute threshold of backscatter decreases dramatically at the peak of parabola, but is still much larger than that of side scatter. We also discuss the absolute thresholds of side scatter under different density profiles, showing not big differences with the linear density profile as well as the analytic formulas. Convective gains, however, are sensitive to the density profiles and collisional damping. The k-space numerical model is verified via analytic formulas and real-space envelope model, and it offers us new perspective on the scattering angles compared with previous models for SRS.
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页数:8
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