微波脉冲大气击穿临界场强估计  

Critical field strength estimation for microwave pulse atmospheric breakdown

作　　者：杨浩[1] 黄诺慈 刘星辰 郑强林[1] 鲍向阳 闫二艳[1,2] Yang Hao;Huang Nuoci;Liu Xingchen;Zheng Qianglin;Bao Xiangyang;Yan Eryan(Institute of Applied Electronics,CAEP,Mianyang 621900,China;Science and Technology on High Power Microwave Laboratory,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]高功率微波技术重点实验室,四川绵阳621900

出　　处：《强激光与粒子束》2024年第4期222-226,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(62001442)。

摘　　要：针对高功率微波在大气传输中可能出现的击穿现象,研究了脉冲序列中首次击穿时的延迟脉冲数,发现其与种子电子、脉冲击穿概率以及微波场强密切相关。研究发现,微波场强可通过作用于种子电子间接影响脉冲击穿概率和延迟脉冲数,由此提出利用延迟脉冲数估计微波击穿临界场强的方法,并定义在脉冲击穿概率大于一定值时的微波临界场强作为击穿阈值。推导了脉冲击穿概率的估计公式,并对估计量的性能进行了分析,随后利用S波段微波大气击穿模拟装置开展了实验验证。实验结果表明,在一定范围内,重复频率微波脉冲击穿延迟脉冲数仅与种子电子产生率和脉宽成反比,能用于估计脉冲击穿概率,进而给出击穿临界场强。In response to the possible breakdown phenomenon of high-power microwave in atmospheric transmission,our study focuses on the first breakdown delay pulse number in pulse sequences.It is found that it is closely related to seed electrons,pulse breakdown probability,and microwave field strength.Microwave field strength can indirectly affect the pulse breakdown probability and delay pulse number through seed electrons.A method is proposed to estimate the critical field strength of microwave breakdown using the number of delayed pulses,and the microwave critical field strength is defined as the breakdown threshold when the probability of pulse breakdown is greater than a certain value.In this paper,the estimation formula of pulse impulse breakdown probability is derived,and the performance of the estimator is analyzed.Then,the experimental verification is carried out using the S band microwave atmospheric breakdown simulation device.The experimental results show that,within a certain range,the number of pulse delays for repetitive frequency microwave pulse breakdown is only inversely proportional to the seed electron generation rate and pulse width,and can be used to estimate the probability of pulse breakdown,thereby giving the critical field strength for breakdown.

关 键 词：微波击穿 临界场强 击穿概率 估计 延迟脉冲 

分 类 号：O531[理学—等离子体物理]