基于高斯波束传输的高功率微波的大气击穿问题

提出了一种修正利用高斯波束传输高功率微波(High-Power Microwave,HPM)时的大气折射率的模型．在此模型中,把高斯波束横截面分成若干个同心圆环,并假定每一个同心圆环内的场强分布是均匀的．以基于电子流体力学方程和Maxwell方程的大气击穿理论,利用由实验数据拟合出来大气粒子的碰撞和大气电离参数,研究了高能量高斯波束的非线性传输,数值计算了在给定高斯波束参数时,在不同的压强下,波束以不同的电场强度、频率、脉冲宽度入射下的大气折射率．通过分析折射率的时间色散、空间色散以及时间空间色散,讨论了传输HPM脉冲的高斯波束的大气击穿问题,获得了一些有意义的结果．

Research on the High-Power Microwave Gaussian Beam Air Breakdown

The nonlinear propagation of high-power microwave Gaussian beam in the atmosphere is studied. An appropriate model is presented for calculating the air refractive index when HPM Gaussian beam propagates in the atmosphere. In this model, the cross-section area is treated as a number of concentric annulus, and assuming each has a uniform electric field intensity distribution. Based on the knowledge of air breakdown and the theory of the propagation of Gaussian beam, the air refractive index is calculated for different field intensity, frequency of microwave, width of pulse, pressure, when giving parameters of the Gaussian beam. Then the curves of temporal spatial dispersion are given in the paper. The air breakdown is discussed based on the calculations and some useful results have been obtained.