Experiments of radiation-driven Rayleigh-Taylor instability on the Shenguang-Ⅱ laser facility
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摘要: 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。Abstract: In laser indirect-driven inertial-confinement-fusion (ICF), the capsules with multi-layered structure are subjected to hydrodynamic instabilities. Rayleigh-Taylor instability growth at the ablation front and the interface between the DT ice and central gas plays a key role in the success of the fusion ignition. A series of radiation-driven ablation-front RT growth experiments were conducted on Shenguang Ⅱ laser facility. Face-on radiographies were obtained for an extensive set of conditions: different initial amplitude (0.3, 0.44, 1.4, and 2.7 m), different perturbation wavelengths (20, 30, 50, and 72m), and different materials (C50H47Br3, C50H44Br6, C8H8). The onset of second and third harmonics and their growth were well observed in the experiments. The experimental results provide useful database for the validation of our hydrocode simulation.
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