外场下等离子体中波的增强和带电粒子流的加速  

Enhancement of wave and acceleration of electron in plasma by external field

作　　者：吴军[1] 吴健[2] 李强[2] 

机构地区：[1]武汉大学电子与信息学院,湖北武汉430079 [2]中国电波传播研究所电波环境特性及模化技术国家重点实验室,北京102206

出　　处：《电波科学学报》2007年第1期38-42,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金(40310223);电波环境特性及模化技术国家重点实验室基金(9140C080401060C0805)资助

摘　　要：在不考虑碰撞机制的情况下,研究了外加高频电磁场(泵波)下等离子体中Langmuir波和离子声波的增强以及带电粒子流的加速。基于流体力学方程,推导了描述等离子体参量不稳定性的振动方程,进一步得到描述带电粒子流加速的数学表达式和有质动力的数学表达式。结果表明,在等离子体参量不稳定性的激发过程中,Langmuir波和离子声波得以增强以及带电粒子流由于泵波与Langmuir波(离子声波)的耦合而加速;有质动力的产生是由于泵波与Langmuir波(离子声波)的耦合而且它是参量不稳定过程的策动力,另外有质动力不仅存在高频分量,还存在低频分量。Enhancement of Langmuir and ion-acoustic wave and acceleration of the electron in a collisionless plasma, in the presence of an external transverse field, were investigated. Based on hydrodynamic equations, an equation formulizing the parametric instability was derived. Furthermore, the formula for ponderomotive force and the expression demonstrating the electron acceleration were obtained. The results show that Langmuir and ion-acoustic wave get enhanced and the charged particles can be accelerated by the coupling of wave-wave. In addition it can be concluded that ponderomotive force due to the coupling of the external field （pump） and Langmuir wave （ion-acoustic wave） is the driving force to excite the parametric instability and comprises the high-and low-frequency components.

关 键 词：参量不稳定性 等离子体波增强 电子加速 有质动力 

分 类 号：TL612.4[核科学技术—核技术及应用] TN011[电子电信—物理电子学]