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本文从实验和理论两方面系统研究了真空环境中激光产生的硅等离子体的辐射动力学特性.实验上利用时间-空间分辨的激光等离子体发射光谱技术,测量了激光产生的硅等离子体极真空紫外波段的光谱,并对光谱进行了分析指认.为了进一步研究实验光谱的时空演化特性,提出了一种简化的基于流体动力学和辐射输运方程的等离子体辐射动力学模型,利用该模型研究了激光产生的等离子体的辐射特性和动力学演化行为,并对实验观测到的时空分辨光谱进行了模拟,详细分析了等离子体的温度、密度和离子布居的时空演化特性.研究结果表明,本文提出的模型能够较好地反映激光等离子体的动力学演化过程以及辐射光谱的特征,可以作为一种有效的激光等离子体诊断工具.
In this paper, the radiation dynamics characteristics of laser-generated silicon plasma in a vacuum environment are systematically studied both experimentally and theoretically.In the experiment, the laser plasma-generated plasma was measured by using the time-space resolved laser plasma emission spectroscopy In order to further study the spatiotemporal evolution characteristics of experimental spectra, a simplified model of plasma radiation dynamics based on hydrodynamics and radiation transport equations is proposed. By using this model, The radiation characteristics and kinetic evolution behavior of the plasma generated by the laser were simulated and the space-time resolved spectra were experimentally observed. The temperature, density and ionospheric evolution of the plasma were analyzed in detail.The results show that the plasma- The model proposed in this paper can well reflect the dynamic evolution of laser plasma and the characteristics of the radiation spectrum, which can be used as an effective laser plasma diagnostic tool.