不均匀非磁化等离子体柱的ZTFDTD分析

ZTFDTD analysis of inhomogeneous unmagnetized plasma cylinder

推导出了一种归一化的Z变换FDTD算法(ZTFDTD),将这种方法用于仿真电磁波与非磁化等离子体的相互作用的研究中,给出了非磁化等离子体的FDTD迭代公式。通过二维模型分别仿真了在不同等离子体自由电子密度分布下等离子体柱对同一频率电磁波的折射作用、相同自由电子密度分布下等离子体柱对不同频率电磁波的折射作用,以及在不同电磁波频率和等离子体碰撞频率下,非磁化等离子体柱对电磁波的折射和碰撞吸收作用。数值结果表明,等离子体隐身在理论上是有效可行的,合理地设置等离子体参数,可以极大地增强等离子体隐身效果。

A novel and normalized Z-Transform-based finite-difference time-domain （ZTFDTD） method was presented for simulating the interaction of electromagnetic （EM） wave with unmagnetized plasma. The 2-D ZTFDTD formulations for unmagnetized plasma were derived. By using a simplified 2-D model for inhomogeneous unmagnetized plasma （IUP） cylinder, the stealth effect of inhomogeneous unmagnetized plasma was studied in different electron densities of plasma, EM wave frequencies and plasma collision frequencies. Numerical results indicate that plasma stealth is effective in theory and the reasonable selection for the plasma parameters can greatly enhance its effectiveness.