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间接驱动激光聚变过程中,黑腔内物质处于非局域热动平衡(non-LTE)状态,而且辐射传输具有非平衡、各向异性等特点。为了精确描述黑腔辐射场的演化及其与物质的相互作用,最新研制的激光聚变二维总体LARED集成程序,基于non-LTE的多群辐射输运建模,首次实现了激光黑腔靶实验的全过程数值模拟。数值结果表明,辐射输运计算较好地反映了黑腔辐射场均匀性变化,腔壁光斑区与非光斑区X光发射强度比与实验测量值接近,靶丸压缩形状与实验图像定性一致。
During indirect laser-driven fusion, the materials in the black cavity are in non-local thermal-equilibrium (non-LTE) state, and the radiation transmission is non-equilibrium and anisotropic. In order to accurately describe the evolution of black cavity radiation field and its interaction with matter, the newly developed laser fusion two-dimensional overall LARED integrated program based on non-LTE multi-group radiation transport modeling, for the first time realized the laser black cavity target experiment The whole process of numerical simulation. The numerical results show that the radiation transport calculation can well reflect the uniformity of the radiation field in the black cavity. The X-ray emission intensity ratio of the cavity wall spot and non-spot area is close to the experimental value. The compression shape of the target capsule is qualitatively consistent with the experimental images.