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与中心点火相比,快点火将压缩和点火过程分开,大大放宽了对压缩对称性和驱动能量的要求。通过在神光Ⅱ激光装置上开展了快点火锥壳靶预压缩实验研究,利用X射线背光分幅照相方法观察到了清晰完整的快点火锥壳靶内爆压缩过程,并利用阿贝反演结合剩余烧蚀质量的方法得到了不同时刻燃料密度、面密度分布数据,当前实验条件下获得的最大压缩密度和面密度分别为30g/cm3和50mg/cm2;为解决金柱腔M带对导引锥的预热以及由此导致的燃料-锥体材料混合问题,提出了一种在锥体表面镀低Z材料的方法,实验和辐射流体数值模拟结果验证了该方法的有效性,该方法的成功解决了间接驱动快点火激光聚变的重要关键技术问题。
Compared with the center ignition, fast ignition will be compressed and ignited the ignition process, greatly relaxing the compression symmetry and driving energy requirements. Through the experimental research on the rapid pre-compression of the cone shell target on ShenGuang II laser device, a clear and complete fast cone-blasting target detonation compression process was observed by X-ray backlit photography. Abbe inverse inversion combined The remaining ablation mass method was obtained at different times of fuel density, surface density distribution data obtained under the current experimental conditions, the maximum compressive density and areal density 30g / cm3 and 50mg / cm2; Cone preheating and the resulting fuel-cone material mixing problem, a method of plating low-Z material on the surface of the cone is proposed. The experimental and numerical simulation results of the radiation fluid validate the effectiveness of the method. The successful solution to the indirect drive fast ignition laser fusion important key technical issues.