氧负离子解吸附过程HPM大气击穿弛豫时间分析

发布时间：2018-04-01 17:16

本文选题：高功率微波　切入点：重复频率　出处：《强激光与粒子束》2017年11期

【摘要】：基于全局模型,引入氧负离子解吸附过程,完善了重复频率高功率微波脉冲弛豫模型,理论研究了重复频率高功率微波脉冲大气击穿弛豫过程,数值模拟了不同附着频率、解吸附频率以及初始电子浓度条件下,弛豫过程电子浓度随时间的变化规律。结果表明:弛豫过程电子浓度变化分为快衰减和慢衰减两个阶段;发现氧负离子的引入明显延缓了弛豫过程后期电子的衰减;解吸附频率与附着频率对弛豫过程有着相反的影响,解吸附频率越高,慢衰减阶段的电子浓度越高,快衰减阶段电子浓度变化不明显;附着频率越高,快衰减阶段电子浓度变化越剧烈,慢衰减阶段的电子浓度越低;初始电子浓度越大,慢衰减阶段电子浓度变化越剧烈。
[Abstract]:Based on the global model, the oxygen negative ion desorption process is introduced to perfect the high power microwave pulse relaxation model at repetition rate. The breakdown relaxation process of high power microwave pulse at repetition rate is studied theoretically, and the different attachment frequencies are numerically simulated. Under the condition of desorption frequency and initial electron concentration, the electron concentration of relaxation process varies with time. The results show that the change of electron concentration in relaxation process can be divided into two stages: fast decay and slow decay. It is found that the introduction of oxygen anion obviously delays the electron decay in the later stage of relaxation, and the desorption frequency and the attachment frequency have opposite effects on the relaxation process. The higher the desorption frequency, the higher the electron concentration at the slow decay stage. The change of electron concentration is not obvious in the fast decay stage; the higher the attachment frequency, the more intense the electron concentration in the fast attenuation stage, and the lower the electron concentration in the slow attenuation stage, and the greater the initial electron concentration is, the more intense the electron concentration changes at the slow attenuation stage.
【作者单位】：解放军信息工程大学信息系统工程学院;
【基金】：国家自然科学基金项目(61201056,61271104)
【分类号】：TN015

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