激光驱动冲击波在铝-金阻抗匹配靶中的传播稳定性  

Shockwave propagation stability in Al-Au impedance-matching target irradiated by high power laser

作　　者：黄秀光[1] 罗平庆[2] 傅思祖[1] 舒桦[1] 龙滔[2] 吴江[1] 叶君建[1] 何钜华[1] 马民勋[1] 顾援[1] 

机构地区：[1]中国工程物理研究院上海激光等离子体研究所,上海201800 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《强激光与粒子束》2007年第11期1832-1836,共5页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题

摘　　要：针对神光Ⅱ第九路激光条件,利用1维JB程序和多台阶靶技术对冲击波在铝-金阻抗匹配靶中的传播稳定性进行了理论和实验研究,实验结果与理论结果基本吻合。结果表明,激光驱动冲击波在铝-金阻抗匹配靶中传播时,高阻抗待测材料金中的冲击波稳定传播最大距离急剧减小。因此,在进行铝-金阻抗匹配靶物理参数设计时,应保证高阻抗材料金台阶厚度满足冲击波传播稳定性,然后再按照阻抗匹配实验中两种材料的冲击波速度比来确定低阻抗标准材料铝的台阶厚度。根据神光Ⅱ第九路激光条件,铝-金阻抗匹配靶中铝基底厚度选取为30μm左右较好,金台阶和铝台阶厚度应分别小于10μm和17μm。According to the laser conditions of the ninth beam of Shenguang-Ⅱ facility, the characteristics of the laser-driving shockwave propagation in Al-Au impedance-matching target were studied by JB code and multi-step technique, respectively. The experimental results were consistent with the numerical simulation results. The results show that the shoekwave＇s maximum stable propagation distance in gold decreases rapidly when shock front propagates from aluminum to gold. Therefore, when people design the AI-Au impedance-matching target, they should first select the Au step thickness, in which the shoekwave should propagate steadily. The AI step thickness will be selected according to the calculated shoekwave velocity ratio of the two materials in impedance-matching target. For the ninth beam of Shenguang-Ⅱ facility, the suitable AI substrate thieknes is about 30μm, the Au step thickness and the AI step thickness should be seleeted as less than 10μm and 17μm , respectively.

关 键 词：阻抗匹配 冲击波 稳定性 数值模拟 

分 类 号：O347.5[理学—固体力学] O242.1[理学—力学]