Abstract

The instability and electrostatic wave modes generation in a cold negative ion plasma which streams across a static magnetic field has been analysed by fluid dynamical model and computer simulation technique. In the theoretical approach, we observed different kinds of acoustic modes and cyclotron modes at an oblique angle to the static magnetic field. At some critical wave number, the positive and negative ion acoustic modes split up into two, fast and slow waves. The value of critical wave numbers and wave growth rates depends on the plasma streaming velocity, electron concentration in the system, and magnetic field intensity. In the presence of high intense external magnetic fields, we observed a wave coupling between different electrostatic modes. With the help of computer simulation performed by the Particle In Cell method, we confirmed the presence of theoretically proposed wave modes and studied the evolution of instability in detail.

Graphical abstract

中文翻译：

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静磁场下流动负离子等离子体不稳定性的理论和计算研究

摘要

通过流体动力学模型和计算机仿真技术分析了在冷的负离子等离子体中流过静磁场的不稳定性和静电波模式的产生。在理论方法中，我们以相对于静磁场倾斜的角度观察了不同种类的声学模式和回旋加速器模式。在某个临界波数下，正离子和负离子声波模式分为快波和慢波两种。临界波数和波增长率的值取决于等离子流速度，系统中的电子浓度和磁场强度。在高强度外部磁场的存在下，我们观察到不同静电模式之间的波耦合。借助于“粒子内细胞”方法执行的计算机模拟，

图形概要