微波输出窗内表面闪络击穿3维全电磁等离子体流体模拟

发布时间：2018-02-13 00:51

  本文关键词： 高功率微波输出窗 闪络 击穿 电磁场时域有限差分 等离子体流体模型　出处：《强激光与粒子束》2016年03期 　论文类型：期刊论文

【摘要】：通过建立电磁场等离子体流体耦合物理模型,基于自主研发的3维全电磁粒子模拟大规模并行程序NEPTUNE3D,编制了3维电磁场与等离子流体耦合程序模块,对1.3GHz高功率微波窗内表面闪络击穿物理过程进行了数值模拟。研究结果表明:微波窗内侧表面形成的等离子体构型与初始种子电子分布形式密切相关。中心点源分布下,等离子体发展为"蘑菇"形状,输出微波脉冲缩短并不严重,等离子体吸收微波功率大于反射微波功率;面源分布下,等离子体发展为"帽子"形状,输出微波脉冲缩短严重,输出微波完全截断,开始阶段等离子体吸收微波功率占优,待等离子体密度增加到一定程度后,反射微波功率占优。通过降低窗体表面场强、表面释气率及初始种子电子密度等方法,可不同程度地延长输出微波脉冲宽度。窗体表面不同气体层厚度对闪络击穿下的输出微波脉冲宽度影响不大。
[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.
【作者单位】： 西南交通大学物理科学与技术学院;北京应用物理与计算数学研究所;
【基金】：国家自然科学基金项目(11305015,11475155,61201113,11371067) 国家重点基础研究发展计划项目(2013CB328904)
【分类号】：TN015;O53
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本文编号：1506953