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 shockwave's maximum stable propagation distance in gold decreases rapidly when shock front propagates from aluminum to gold.Therefore,when people design the Al-Au impedance-matching target, they should first select the Au step thickness, in which the shockwave should propagate steadily. The Al step thickness will be selected according to the calculated shockwave velocity raio of the two materials in impedance-matching target. For the ninth beam of Shenguang-II facility, the suitable Al substrate thickness is about 30 μm, the Au step thickness and the Al step thickness should be selected as less than 10 μm and 17 μm, respectively.