物理学报Issue(12)：1-5,5.DOI:10.7498/aps.62.125202
激光冲击波压缩稠密铝辐射不透明度实验研究*
Experimental studies on the opacity of dense aluminum compressed by a laser-driven shock waves∗
摘要
Abstract
The high-precise opacity of the dense plasma has important applications in the design and simulation of fusion research, and in plasma diagnostics. Base on the novel technique of point-projection backlighting, a broadband high-resolution elliptical crystal X-ray spectrometer, which is used to measure simultaneously the self-emission spectrum, the backlighting source spectrum, and the trans-mission spectrum in one shot, is designed on the Shengguang-II laser facility. The process of the colliding-shock-compressed sample by laser-driven shock waves is also investigated using a one-dimensional radiation hydrodynamics code MULTI. In the measurement, the dense plasma, produced in aluminum by colliding shocks driven by laser beams, reaches a peak density several times that of a solid, and the short backlighting from the 3d–4f transition bands of ytterbium is used as an absorption source for time-and space-resolving diagnostics. Several experimental results are obtained, they are the X-ray source spectrum, the transmission spectrum, and the self-emission spectrum of the dense Al sample in one shot obtained by using the point-projection method, as well as X-ray-absorption fine-structure spectra, and the changes in the K-shell photo-absorption edge of aluminum as it was compressed by a laser-driven shock waves. The transmissivity distribution and red-shift around 80 m˚A (with respect to the cold value of 1.56 keV) of the dense aluminum are also obtained. The data obtained are further analysed. As a result, a new theoretical model is developed.关键词
冲击波压缩等离子体/X射线吸收谱/线移/精细结构Key words
plasma production by shock waves and compression/X-ray absorption spectra/line shift/fine structure引用本文复制引用
王瑞荣,王伟,方智恒,安红海,贾果,谢志勇,孟祥富..激光冲击波压缩稠密铝辐射不透明度实验研究*[J].物理学报,2013,(12):1-5,5.基金项目
国家自然科学基金(批准号:11175167)资助的课题 （批准号:11175167）
