【摘要】：研究高功率微波作用下等離子體中的雪崩效應(yīng),對于研究等離子體防護技術(shù)具有重要意義.通過采用等離子體流體近似方法,建立等離子體中的波動方程、電子漂移-擴散方程和重物質(zhì)傳遞方程,表征電磁波在等離子體中的傳播以及等離子體內(nèi)部帶電粒子的變化情況,分析研究了高功率微波作用下雪崩效應(yīng)的產(chǎn)生過程和變化規(guī)律.研究表明,入射電磁波功率決定了雪崩效應(yīng)的產(chǎn)生;初始電子密度能夠影響雪崩效應(yīng)產(chǎn)生的時間;入射電磁波的激勵作用初始表現(xiàn)為集聚效應(yīng),當(dāng)激勵能量積累到一定閾值時,雪崩效應(yīng)才會產(chǎn)生;在雪崩效應(yīng)產(chǎn)生過程中,等離子體內(nèi)部電子密度的變化非常迅速并且比較復(fù)雜.雪崩效應(yīng)產(chǎn)生后,等離子體內(nèi)截止頻率會遠(yuǎn)超過入射波頻率,電磁波不能在等離子體中傳播,從而起到防護高功率微波的效果.
[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.
【作者單位】： 國防科技大學(xué)脈沖功率激光技術(shù)國家重點實驗室;
【基金】：國家高技術(shù)研究發(fā)展計劃(批準(zhǔn)號:2015AA8016029A)資助的課題~~
【分類號】：O53

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本文編號：2510765