發(fā)布時間：2018-02-13 00:51

  本文關(guān)鍵詞： 高功率微波輸出窗 閃絡(luò) 擊穿 電磁場時域有限差分 等離子體流體模型　出處：《強激光與粒子束》2016年03期 　論文類型：期刊論文

【摘要】：通過建立電磁場等離子體流體耦合物理模型,基于自主研發(fā)的3維全電磁粒子模擬大規(guī)模并行程序NEPTUNE3D,編制了3維電磁場與等離子流體耦合程序模塊,對1.3GHz高功率微波窗內(nèi)表面閃絡(luò)擊穿物理過程進行了數(shù)值模擬。研究結(jié)果表明:微波窗內(nèi)側(cè)表面形成的等離子體構(gòu)型與初始種子電子分布形式密切相關(guān)。中心點源分布下,等離子體發(fā)展為"蘑菇"形狀,輸出微波脈沖縮短并不嚴重,等離子體吸收微波功率大于反射微波功率;面源分布下,等離子體發(fā)展為"帽子"形狀,輸出微波脈沖縮短嚴重,輸出微波完全截斷,開始階段等離子體吸收微波功率占優(yōu),待等離子體密度增加到一定程度后,反射微波功率占優(yōu)。通過降低窗體表面場強、表面釋氣率及初始種子電子密度等方法,可不同程度地延長輸出微波脈沖寬度。窗體表面不同氣體層厚度對閃絡(luò)擊穿下的輸出微波脈沖寬度影響不大。
[Abstract]:By establishing a physical model of electromagnetic field plasma fluid coupling, a 3D electromagnetic field and plasma fluid coupling program module is developed based on NEPTUNE3D, a 3D full-electromagnetic particle simulation program developed by ourselves. The physical process of flashover breakdown on the inner surface of 1.3GHz high power microwave window is numerically simulated. The results show that the plasma configuration formed on the inner surface of the microwave window is closely related to the initial seed electron distribution. The plasma develops into a "mushroom" shape, the output microwave pulse shortens is not serious, the microwave power absorbed by the plasma is larger than the reflected microwave power, the plasma develops into the "cap" shape under the distribution of the non-point source, and the output microwave pulse shortens seriously. The microwave output is completely truncated, and the microwave power absorbed by the plasma is dominant at the beginning. When the plasma density is increased to a certain extent, the reflected microwave power is dominant. The surface gas release rate and the initial seed electron density can prolong the output microwave pulse width to some extent, and the thickness of the gas layer on the surface of the form has little effect on the output microwave pulse width under the flashover breakdown.
【作者單位】： 西南交通大學(xué)物理科學(xué)與技術(shù)學(xué)院;北京應(yīng)用物理與計算數(shù)學(xué)研究所;
【基金】：國家自然科學(xué)基金項目(11305015,11475155,61201113,11371067) 國家重點基礎(chǔ)研究發(fā)展計劃項目(2013CB328904)
【分類號】：TN015;O53
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本文編號：1506953