腔靶X射线辐射特性实验研究

EXPERIMENTAL INVESTIGATION OF X-RAY RADIATION CHARACTERIZATION FOR CAVITY TARGETS

在上海“神光”装置上,对柱形腔靶X射线辐射的温度、光谱以及时间特性进行了实验研究,得到内爆区轴向温度随空间位置的变化特征。观测到腔内激光直接烧蚀靶物质产生的第一次X射线辐射和等离子体运动、汇聚形成的第二次X射线辐射,两次辐射的时间间隔为1.2ns。通过测量源区和内爆区X射线辐射空间能谱结构,结果表明源区X射线辐射能谱是非平衡的,而内爆区X射线辐射能谱近似为Planck谱。

The experimental investigation of X-ray radiation characterized by the cavity targets was carried out at the Shenguang laser facility. The temperature profile along the axis of the cavity target was given. The first X-ray radiation from the laser heating phase and the second X-ray radiation from the expanded plasma collision phase were measured. The time interval between the two radiations was about 1.2 ns. The spectrum of the radiation from the implosion region was similar to a Planck spectrum.