辐射驱动内爆流线实验测量

Measurement of implosion trajectory for hohlraum-radiative-driven

内爆速度的测量是惯性约束聚变研究中的核心问题,是判断聚变点火反应的关键物理量.在神光Ⅱ激光装置上,利用KB显微镜配合时间分辨为10 ps的条纹相机,对1600 J激光能量注入,3倍频,脉宽为1 ns黑腔辐射驱动CH靶球,获得了清晰的辐射驱动内爆流线轨迹X射线图像.通过流线轨迹图像给出了最大内爆速度为160 km/s.利用MultilD程序对内爆压缩流线和壳层速度变化进行了模拟,实验数据和理论模拟较符合.

The measurement of implosion velocity is the core problem of inertial confinement fusion and it is also a key quantity of estimation of fusion ignition.A clear implosion trajectory X-ray image of hohlraum-radiative-driven CH-capsule is obtained in Sheng-Guangll laser facility with 1600 J laser energy,triple frequency and 1 ns pulse width.KB-microscope coupled with X-ray streak camera whose temporal resolution is about 10 ps is used for diagnosis.The maximal velocity of implosion is about 160 km/s which can be extracted from the experimental trajectory data.The experimental data are compared with MultilD simulation results of velocity and both are in good agreement with each other.