Experimental analysis of indirect-drive ablative Rayleigh-Taylor instability on Shenguang Ⅱ
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摘要: 在神光Ⅱ激光装置上开展了一系列辐射烧蚀Rayleigh-Taylor(RT)不稳定性实验。平面靶烧蚀加速飞行轨迹实验结果与LARED-S模拟结果的比较表明腔壁辐射源能流明显小于激光注入孔的辐射能流, 且辐射源的非平衡Planckian谱对靶的飞行轨迹和扰动增长有重要影响。实验分别观测到初始小扰动幅度烧蚀RT 明显的增长和初始大扰动幅度尖钉变窄和气泡变宽的清晰物理图像。 通过提高空间分辨率, 实验获得了二次和三次谐波的增长数据, 模拟结果与实验结果相符合。 神光Ⅱ激光装置上开展的流体不稳定性实验考核了LARED-S程序的一维和二维计算。Abstract: A series of ARTI experiments have been performed in Shenguang Ⅱ(SGⅡ) laser facility of China. The simulation results from the LARED-S code for the planar foil trajectory experiment indicate that the energy flux at the hohlraum wall is obviously less than that at the laser entrance hole (LEH). Furthermore, the non-Planckian spectra of X-ray source can affect the dynamics of the foil flight and the perturbation growth. The images of evident growth of the ARTI initiated by a small-amplitude perturbation and the spike-bubble pattern initiated by large-amplitude perturbation were observed. The data of the growth of the second and the third harmonics were also obtained by increasing the spatial resolution in the experiments. The simulation results are in general consistent with the experimental results. The reliability of the LARRED-S code has been tested and validated through the comparison with the experiment results.
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