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在神光Ⅱ装置上开展了辐射驱动RT不稳定性的一系列实验,获得了不同初始扰动幅度、不同扰动波长、不同材料样品等条件下辐射烧蚀RT不稳定性增长的高时空分辨背光图像,特别是在大初始扰动幅度样品实验中获得了扰动增长的清晰图像,观察到了扰动增长从线性区到非线性区的过渡过程,二次和三次谐波的产生和发展清楚可见。充实了数值模拟程序考核的实验数据库,对间接驱动ICF点火靶设计和研究具有重要作用。
A series of experiments on radiant-driven RT instability were carried out on SG-II device. High spatial-temporal resolved backlight images with different initial perturbation amplitudes, different perturbation wavelengths and different material samples were obtained. In particular, a clear image of the disturbance growth was obtained in a large initial perturbation amplitude sample experiment. The transition of the disturbance growth from the linear region to the nonlinear region was observed. The generation and development of the second and third harmonics were clearly visible. It enriches the experimental database of numerical simulation program evaluation and plays an important role in the design and research of Indirectly driven ICF ignition target.