等离子体中朗缪尔湍动对调制不稳定性的影响

核聚变与等离子体物理 ›› 2013, Vol. 33 ›› Issue (1): 19-24.

等离子体中朗缪尔湍动对调制不稳定性的影响

郝东山

(郑州华信学院信息工程系，新郑 451100)

收稿日期:2012-05-20 修回日期:2012-08-04 出版日期:2013-03-15 发布日期:2013-03-15
作者简介:郝东山(1949-)，男，河南西平人，教授，主要从事激光物理与光纤通信基础理论研究。
基金资助:
河南省基础与前沿技术研究资助项目(092300410227)

Influence of modulation instability induced by Langmuir turbulence in plasma

HAO Dong-shan

(Department of Information Engineering, Zhengzhou Huaxin University, Xinzheng 451100)

Received:2012-05-20 Revised:2012-08-04 Online:2013-03-15 Published:2013-03-15

摘要/Abstract

摘要：

基于多光子非线性Compton散射模型，研究了Compton散射下等离子体中强朗缪尔湍动对调制不稳定性的影响。将入射光和Compton散射光作为形成强朗缪尔湍动和调制不稳定性的新机制，给出了强朗缪尔湍动、色散和调制不稳定性时间增长率所满足的修正方程，并进行了数值模拟。结果表明，与Compton散射前相比，Compton散射使等离子体内产生了更为剧烈的坍塌，坍塌后期形成的强朗缪尔湍动，使等离子体界面附近的调制不稳定性的时间增长率显著增大，调制不稳定性发展得更快，光场峰值增加得更强，并使整体激光场出现明显的成丝现象。

关键词: 等离子体, 多光子非线性Compton散射, 强缪尔湍动, 坍塌, 调制不稳定性

Abstract:

According to the model of multi-photon nonlinear Compton scattering, the influence of the modulation instability in the plasma induced by Langmuir turbulence under the multi-photon nonlinear Compton scattering has been studied. The revised equations for the strong Langmuir turbulence, dispersion and the time increasing rate of the modulation instability have been given out using a new mechanism of the strong Langmuir turbulence and modulation instability formed by the incident light and Compton scattered optical, and the equations are simulated. The results show that the even acute collapsing is induced by Compton scattering in the plasma, and the time increasing rate of the modulation instability near the plasma surface is markedly increased because of the strong Langmuir turbulence induced by the final collapsing, the modulation instability is even quickly developed, the even strong optical field peak is increased, and the clear thin wires of all the laser field is formed.

Key words: Plasma, Multi-photon nonlinear Compton scattering, Strong Langmuir turbulence, Collapsing, Modulation instability

中图分类号:

O431

郝东山. 等离子体中朗缪尔湍动对调制不稳定性的影响[J]. 核聚变与等离子体物理, 2013, 33(1): 19-24.

HAO Dong-shan. Influence of modulation instability induced by Langmuir turbulence in plasma[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2013, 33(1): 19-24.

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