Stimulated Raman scattering in laser plasma with non-thermal electron distribution

IF 2.9 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

The European Physical Journal Plus Pub Date : 2025-09-29 DOI:10.1140/epjp/s13360-025-06868-y

Yong Liu, Xiaoqing Liu

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Abstract

The threshold and growth rate of stimulated Raman scattering (SRS) in laser plasma with super-Gaussian-Maxwellian (SGM) distributed electrons are investigated based on the nonlinear dispersion relation derived from kinetic theory. The differences in SRS characteristics among electrons following the SGM, Maxwellian, and super-Gaussian distributions under the same effective kinetic temperature are analyzed numerically using experimental parameters. It is found that the SRS threshold increases with electron density. The threshold for Maxwellian-distributed electrons is significantly higher than that for super-Gaussian-distributed electrons and considerably lower than that for SGM-distributed electrons. When the incident laser intensity is weak, the electron density corresponding to the maximum growth rate increases with laser intensity and is highest for SGM-distributed electrons. However, when the incident laser intensity is sufficiently strong, the growth rate of SRS increases with electron density and reaches its maximum at one-fourth of the critical electron density. The growth rate for electrons with an SGM distribution is slightly higher than those for the other two distributions. These results are conducive to the understanding of SRS properties in laser-plasma interactions.

Graphical abstract

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非热电子分布激光等离子体中的受激拉曼散射

基于动力学理论推导的非线性色散关系，研究了超高斯-麦克斯韦分布电子的激光等离子体中受激拉曼散射的阈值和增长速率。利用实验参数，数值分析了相同有效动力学温度下电子在SGM分布、麦克斯韦分布和超高斯分布下的SRS特性差异。发现SRS阈值随电子密度的增大而增大。麦克斯韦分布电子的阈值显著高于超高斯分布电子的阈值，而显著低于sgm分布电子的阈值。当入射激光强度较弱时，最大生长速率对应的电子密度随激光强度的增大而增大，其中sgm分布的电子密度最大。然而，当入射激光强度足够强时，SRS的增长率随电子密度的增加而增加，并在临界电子密度的四分之一处达到最大值。SGM分布的电子生长速率略高于其他两种分布。这些结果有助于理解激光等离子体相互作用中SRS的性质。图形抽象

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来源期刊

The European Physical Journal Plus PHYSICS, MULTIDISCIPLINARY-

CiteScore

5.40

自引率

8.80%

发文量

1150

审稿时长

4-8 weeks

期刊介绍： The aims of this peer-reviewed online journal are to distribute and archive all relevant material required to document, assess, validate and reconstruct in detail the body of knowledge in the physical and related sciences. The scope of EPJ Plus encompasses a broad landscape of fields and disciplines in the physical and related sciences - such as covered by the topical EPJ journals and with the explicit addition of geophysics, astrophysics, general relativity and cosmology, mathematical and quantum physics, classical and fluid mechanics, accelerator and medical physics, as well as physics techniques applied to any other topics, including energy, environment and cultural heritage.