有限磁场中激光引导电磁脉冲的传播特性研究  

Study on propagation properties of laser guiding EMP in a finite magnetic field

作　　者：夏新仁[1] 尹成友[1] 

机构地区：[1]合肥电子工程学院,合肥230037

出　　处：《核聚变与等离子体物理》2009年第1期44-50,共7页Nuclear Fusion and Plasma Physics

基　　金：国家自然科学基金资助项目(60671057)

摘　　要：分析了有限磁场中激光等离子体通道周围为有耗气体介质时激光引导电磁脉冲传播的一般模式的传播特性,建立了有限磁场中激光等离子体通道引导电磁脉冲的几何模型,导出了广义柱坐标系下各向异性介质中纵向场所满足的波动方程及纵向场与横向场的关系。利用边界条件给出了有限磁场中激光引导电磁脉冲传播模式的严格特征方程,重点讨论了传播常数随等离子体参数、周围介质参数和外加磁场的变化。结果表明,有限磁场中激光引导电磁脉冲的传播特性比无磁场或外加无穷大磁场时更具有可控性。The geometric model of laser plasma channel （LPC） guiding electromagnetic pulse （EMP） in a finite electromagnetic field is created; when LPC is in lossy gas the propagation properties of the normal modes of LPC guiding EMP are studied; and then the wave equation of longitudinal electromagnetic field and the relationship between transverse and longitudinal electromagnetic field in anisotropic medium are derived under the generalized cylindrical coordinate system. By applying the boundary conditions of electromagnetic fields, the strict characteristic equation of mode propagation for LPC guiding EMP is deduced, and the effects of plasma parameter, surrounding material and external magnetic field on propagation are discussed. The results show that the propagation properties of magnetized LPC guiding EMP are easy to be controlled compared with those without external magnetic field or an infinite external magnetic field applied.

关 键 词：有限磁场 激光 电磁脉冲 特征方程 传播特性 

分 类 号：TN136[电子电信—物理电子学]