Direct-drive cylindrical target compression at Shenguang-Ⅱ laser facility
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摘要: 在神光Ⅱ激光装置上，针对外径260 m的柱形靶，采用大焦斑拼接的办法（焦斑直径约200 m），开展了八路激光直接驱动压缩实验。利用第九路激光驱动钼X射线背光，使用Kirkpatrick-Baez显微镜成像以及条纹相机记录的方法，获得了柱形靶内爆流线图，据此给出的压缩后密度约为初始密度的120倍。该密度处于快点火电子产生区和能量沉积区密度之间，正是电子束需要传输的密度区域。神光Ⅱ皮秒激光运行后，可以利用这种压缩的柱形靶开展电子束在稠密等离子体中传输的实验研究。Abstract: An experiment of direct-drive cylindrical target compression is carried out using the eight laser beams of Shenguang-Ⅱ laser facility with the spots defocused to 200 m. A clear flow diagram of cylindrical target implosion is obtained with Mo backlight driven by the 9th laser beam and Kirkpatrick-Baez microscopy. Experimental result shows that, for the cylindrical target with an outer diameter of 260 m, a compressed density of up to 120 times the initial density is obtained, which is between the densities of electron production area and energy deposition area. Experiments of electron beam transport and energy deposition in this compressed cylindrical target could be carried out once the Shenguang-Ⅱ ps laser beam is available.
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Key words:
- cylindrical target /
- compression /
- direct drive /
- electron transport /
- fast ignition
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