Wang Feng, Peng Xiaoshi, Liu Shenye, Xu Tao, Mei Lusheng, Jiang Xiaohua, Ding Yongkun
Research Center of Laser Fusion, CAEP, Mianyang 621900, China.
Rev Sci Instrum. 2011 Oct;82(10):103108. doi: 10.1063/1.3653800.
A study was conducted with a line-imaging velocity interferometer on sandwich targets at the Shen Guang-III prototype laser facility in China, with the goal of eliminating the preheat effect. A sandwich target structure was used to reduce the x-ray preheat limitation (radiation temperature ~170 eV) in a radiative drive shock experiment. With a thick ablator, the preheat effect appeared before the shock arrived at the window. After adding a shield layer of high-Z material on the ablator, x-rays which penetrated the ablator were so weak that the blank-out effect could not be measured. This experiment indicates that the sandwich target may provide a valuable technique in experiments such as equation of state and shock timing for inertial confinement fusion studies.
在中国神光三号原型激光装置上，利用线成像速度干涉仪对夹层靶进行了一项研究，目的是消除预热效应。在辐射驱动冲击实验中，采用夹层靶结构来降低X射线预热限制（辐射温度约170电子伏特）。使用厚烧蚀层时，在冲击波到达窗口之前就出现了预热效应。在烧蚀层上添加高Z材料屏蔽层后，穿透烧蚀层的X射线非常微弱，以至于无法测量消光效应。该实验表明，夹层靶可能为惯性约束聚变研究中的状态方程和冲击定时等实验提供一种有价值的技术。
