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基于稠密物质辐射不透明度的理论计算目前有相当大的难度,而稠密物质高精度不透明度数据又对聚变研究中的理论设计和模拟以及状态诊断等方面非常有用.在“神光II”激光装置上建立一发次中能同时测量背光谱、样品自发谱和吸收谱的大谱窗高分辨椭圆弯晶测谱系统,并利用一维辐射流体力学程序MULTI仿真冲击波碰撞压缩样品的过程.在测量中,用点投影背光法、激光烧蚀冲击波碰撞压缩产生稠密铝(Al)样品,激光镱等离子体3d—4f跃迁辐射为短脉冲背光提供样品吸收谱时空分辨诊断,在一发次打靶中得到了背光谱、样品自发谱和X射线吸收精细结构谱,以及稠密Al辐射吸收谱向长波偏移.实验结果给出了诊断能谱区稠密Al相对透射率分布和吸收谱偏移量.这些工作都有益于丰富不透明度这一基础研究领域和进一步开拓许多重要应用.
The theoretical calculation based on dense material radiation opacity is quite difficult at present, and dense material high-precision opacity data is very useful for the theoretical design and simulation of fusion research and state diagnosis. On the laser device, a large-window high-resolution ellipsometry system, which can simultaneously measure the back spectrum, the spontaneous spectrum and the absorption spectrum of the sample, was established and the one-dimensional radiofluidic dynamics program MULTI was used to simulate the process of shock wave collision compression. In the measurement, a dense aluminum (Al) sample was produced by point-projection backscattering and laser ablation shock wave collision compression, and the 3d-4f transition radiation of the laser ytterbium plasma was used to provide spatiotemporal resolution diagnosis of the sample absorption spectrum. The back spectrum, the spontaneous spectrum and the X-ray absorption fine structure spectrum of the sample, and the shift of the dense Al radiation absorption spectrum to the long wavelength were obtained.The experimental results show the relative transmittance distribution and the absorption spectrum offset of the dense Al in the diagnostic energy spectrum. These efforts have all contributed to enriching the basic research area of opacity and further developing many important applications.