高功率微波作用下等离子体中的雪崩效应研究
发布时间：2019-07-05 19:51
【摘要】：研究高功率微波作用下等离子体中的雪崩效应,对于研究等离子体防护技术具有重要意义.通过采用等离子体流体近似方法,建立等离子体中的波动方程、电子漂移-扩散方程和重物质传递方程,表征电磁波在等离子体中的传播以及等离子体内部带电粒子的变化情况,分析研究了高功率微波作用下雪崩效应的产生过程和变化规律.研究表明,入射电磁波功率决定了雪崩效应的产生;初始电子密度能够影响雪崩效应产生的时间;入射电磁波的激励作用初始表现为集聚效应,当激励能量积累到一定阈值时,雪崩效应才会产生;在雪崩效应产生过程中,等离子体内部电子密度的变化非常迅速并且比较复杂.雪崩效应产生后,等离子体内截止频率会远超过入射波频率,电磁波不能在等离子体中传播,从而起到防护高功率微波的效果.
[Abstract]:It is of great significance to study the avalanche effect in plasma under the action of high power microwave for the study of plasma protection technology. By using plasma fluid approximate method, the wave equation, electron drift-diffusion equation and heavy matter transfer equation in plasma are established to characterize the propagation of electromagnetic wave in plasma and the variation of charged particles in plasma. The process and variation of avalanche effect under the action of high power microwave are analyzed and studied. The results show that the power of the incident electromagnetic wave determines the generation of the avalanche effect; the initial electron density can affect the time of the avalanche effect; the excitation effect of the incident electromagnetic wave initially shows the agglomeration effect, and when the excitation energy accumulates to a certain threshold, the avalanche effect will be produced; in the process of the avalanche effect, the change of the electron density in the plasma is very rapid and complex. After the avalanche effect is produced, the cutoff frequency in the plasma will far exceed the frequency of the incident wave, and the electromagnetic wave can not propagate in the plasma, thus playing the effect of protecting the high power microwave.
【作者单位】： 国防科技大学脉冲功率激光技术国家重点实验室;
【基金】：国家高技术研究发展计划(批准号:2015AA8016029A)资助的课题~~
【分类号】：O53
本文编号：2510765
[Abstract]:It is of great significance to study the avalanche effect in plasma under the action of high power microwave for the study of plasma protection technology. By using plasma fluid approximate method, the wave equation, electron drift-diffusion equation and heavy matter transfer equation in plasma are established to characterize the propagation of electromagnetic wave in plasma and the variation of charged particles in plasma. The process and variation of avalanche effect under the action of high power microwave are analyzed and studied. The results show that the power of the incident electromagnetic wave determines the generation of the avalanche effect; the initial electron density can affect the time of the avalanche effect; the excitation effect of the incident electromagnetic wave initially shows the agglomeration effect, and when the excitation energy accumulates to a certain threshold, the avalanche effect will be produced; in the process of the avalanche effect, the change of the electron density in the plasma is very rapid and complex. After the avalanche effect is produced, the cutoff frequency in the plasma will far exceed the frequency of the incident wave, and the electromagnetic wave can not propagate in the plasma, thus playing the effect of protecting the high power microwave.
【作者单位】： 国防科技大学脉冲功率激光技术国家重点实验室;
【基金】：国家高技术研究发展计划(批准号:2015AA8016029A)资助的课题~~
【分类号】：O53
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1 刘竞业,栾晓燕;等离子体通导脉冲大电流的应用研究[J];核聚变与等离子体物理;2000年04期
，本文编号：2510765
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