微波击穿大气电子温度与电子密度依存关系  

Simulation on non-linear propagation of high power microwave pulses in the atmosphere

作　　者：董志伟[1] 周前红[1] 孙会芳[1] 张芳[1] 姜幼明[1] 陈雅深[1] 

机构地区：[1]北京应用物理与计算数学研究所,北京100094

出　　处：《强激光与粒子束》2014年第4期22-27,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11105018);中国工程物理研究院科学技术发展基金项目(2012B0402064)

摘　　要：给出了描述高功率微波脉冲大气非线性传输及微波大气等离子体特征演化的方程组,并在以微波群速度运动的局域坐标系下完成程序编制。据此模拟分析了高功率微波大气长程非线性传输及自产生大气等离子体的基本物理过程,给出了在击穿建立过程中,电子数密度增长与电子温度升高之间的关系。模拟结果表明:由于大气层中本底自由电子数密度较低,高功率微波脉冲到达时会迅速地将大气中现有的自由电子加热至平衡温度,与之相比导致电子数密度雪崩式增长的击穿过程要缓慢得多,而且随着击穿过程的开始电子温度会从平衡温度快速下降。A set of equations for the non-linear propagation of high power microwave pulses in the atmosphere as well as the evolution of self-generated air plasma are deduced.A 1Dcode named Atmospheric Plasma Non-linear Evaluation in code(APNEIC)has been programmed in a local time domain reference frame moving with group velocity of the electromagnetic wave.The evolution of character parameters of the self-generated plasma such as the electron number density,the electron temperature,and the vibration temperature are studied.The simulation results show that during the breakdown startup stage the electron temperature is enhanced very rapidly to saturation values because of the rather low local seed free electrons,while the increase of electron numbers is relatively slow,but the electron temperature decreases soon from its saturation value with the avalanched increase of electrons.

关 键 词：微波 大气击穿 电子温度 电子密度 大气等离子体 

分 类 号：TN011.2[电子电信—物理电子学] TN321.5