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在激光间接驱动惯性约束聚变中,为达到高密度压缩以实现点火,对靶丸内爆对称性和黑腔辐射场均匀性有严格的要求.为了研究内爆不对称性随腔长和时间的变化,实验中采用了三种不同尺寸的黑腔,利用X光分幅相机观测了靶丸燃料区自发光,获得了压缩变形过程和椭圆度变化规律,初步判断了在三种腔型中腔长1700μm的黑腔较接近神光III原型装置内爆对称性要求.根据视角因子程序计算得到辐射流不对称性随时间变化情况,通过一个简化的解析模型推导出内爆形变不对称性随时间变化过程,与实验结果大致符合.由此进一步分析了黑腔辐射场不均匀性的演化导致内爆不对称性随腔长和时间变化的物理机制.
In inertial confinement fusion of laser indirect drive, in order to achieve high density compression to achieve ignition, there are strict requirements on the implosion symmetry of the capsule and uniformity of the radiation field of the black cavity.In order to study the asymmetry of implosion with the cavity length and time Three black cavities with different sizes were used in the experiment. The self-luminescence of the fuel zone of the target was observed by X-ray amplitude camera, and the rules of compressive deformation and ellipticity were obtained. The black cavity with a length of 1700μm is closer to the implosion symmetry requirement of SG III prototype.According to the perspective factor program, the asymmetry of the radiation flux with time is obtained, and a simplified analytical model is used to deduce the asymmetry of the implosion deformation with time The change process is in good agreement with the experimental results, which further analyzes the physical mechanism that the evolution of inhomogeneity in the black cavity causes the implosion asymmetry to change with cavity length and time.