烧蚀RT不稳定性X射线分幅诊断研究进展
Experiment progress of ablative Rayleigh-Taylor instability based on X-ray framing camera
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摘要: 在神光Ⅱ装置上,利用高动态范围高性能X射线分幅相机开展了辐射驱动烧蚀RT不稳定性面背光实验研究.在神光Ⅱ8路2ns辐射源和第九路Mo背光条件下,利用二维时空照相获得了周期20μm、初始扰动1μm烧蚀RT样品清晰的增长过程,并通过掺Br比例1.1%样品观测到RT非线性增长的结果.实验为惯性约束聚变(inertialconfinement fusion,ICF)RT不稳定性定量表征和数值模拟奠定了良好的基础.Abstract: Using high dynamic range X-ray framing camera,the radiation driven ablative Rayleigh-Taylor instability facing backlight radiography on SHENGUANH(SG)Ⅱdevice is studied.In the SG II that has eight beams with the 2 ns laser pulse and the ninth beam for Mo backlight,two-dimensional space-time ablation RT growth process for the cycle 20μm and the initial perturbation 1μm are observed clearly,and the non-linear growth process is also observed by the doping Br ratio of 1.1%in samples.The result lays a good foundation for quantitative characterization and numerical simulation of RT instability in inertial confinement fusion(ICF) experiments.
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