横等离激元与对等离子体的非线性相互作用

核聚变与等离子体物理 ›› 2011, Vol. 31 ›› Issue (1): 19-23.

横等离激元与对等离子体的非线性相互作用

刘勇1, 2，刘三秋1

(1. 南昌大学材料科学与工程学院，南昌 330047; 2. 南通大学理学院，南通 226019)

收稿日期:2010-03-10 修回日期:2010-12-10 出版日期:2011-03-15 发布日期:2011-03-03
作者简介:刘勇(1977-)，男，江苏海安人，博士研究生，讲师，主要从事等离子体物理理论研究。
基金资助:
国家自然科学基金(10963002)；科技部国际科技合作项目(2009DFA02320)；江西省国际科技合作项目

Nonlinear interaction of transverse plasmons with pair plasmas

LIU Yong1, 2, LIU San-qiu1

(1. College of Materials Science and Engineering, Nanchang University, Nanchang 330031;2. School of Sciences, Nantong University, Nantong 226019)

Received:2010-03-10 Revised:2010-12-10 Online:2011-03-15 Published:2011-03-03

摘要/Abstract

摘要：

由色散方程和流体方程推导得到了横等离激元和对等离子体相互作用的非线性控制方程，利用场论的方法构建非线性控制方程的拉格朗日密度函数并求得相互作用过程中守恒的等离激元数和总能量。通过标度变换发现横等离激元由于调制不稳定性将坍塌形成小尺度的局域结构。在坍塌过程中横等离激元产生的有质动力随场强的增强而增强。由于有质动力对粒子的排斥，对等离子体中将产生小尺度的密度空穴。

关键词: 横等离激元, 对等离子体, 密度空穴, 坍塌

Abstract:

Nonlinear governing equation for the interactions of transverse plasmons with pair plasmas is derived from the dispersion and fluid equations. Using field theory, Lagrangian density function for the nonlinear equation is constructed and the conserved plasmon number and total energy are obtained. By scale transformation, it is shown the multidimensional transverse plasmons will undergo collapse and form a localized structure with small scales due to modulational instability. During collapsing, the ponderomotive force will be enhanced for the increase of the field strength. Eventually, there will be small scale density cavitons which are produced by ponderomotive expulsion.

Key words: Transverse plasmons, Pair plasmas, Density caviton, Collapse

中图分类号:

O431

刘勇1, 2，刘三秋1. 横等离激元与对等离子体的非线性相互作用[J]. 核聚变与等离子体物理, 2011, 31(1): 19-23.

LIU Yong1, 2, LIU San-qiu1. Nonlinear interaction of transverse plasmons with pair plasmas[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2011, 31(1): 19-23.

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