高耦合效率及对称性的黑腔构型柔性设计方法与实验研究

项目名称： 高耦合效率及对称性的黑腔构型柔性设计方法与实验研究

项目编号： No.11475154

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 江少恩

作者单位： 中国工程物理研究院激光聚变研究中心

项目金额： 94万元

中文摘要： 利用激光注入黑腔被腔壁吸收转换而产生的X射线辐射源是进行流体动力学、高压状态方程、辐射输运及极端条件下原子参数等研究的重要手段，对受控核聚变、天体物理等高能量密度物理研究领域具有重要意义。激光间接驱动惯性约束聚变（ICF），也采用这种X射线辐射烧蚀驱动聚变靶丸内爆，实现中心点火。传统ICF黑腔均采用简单圆锥曲线构造，如直线、椭圆、抛物线及圆弧等，过于局限，设计自由度少，限制黑腔效率和品质的进一步提高。本申请拟采用非均匀有理B样条方法，通过调节控制点和权重，实现现有各种黑腔构型的统一柔性表示及辐射场计算，且可在更大优化空间寻找可能更为优化的腔形，使辐射场更均匀且靶丸表面驱动温度更高。在神光III激光装置上，开展有针对性的验证实验，检验这种设计的效果，并通过实验结果修正设计。该方法突破了传统黑腔构型采用圆锥曲线描述形式的局限性，更具一般性，拓展了优化设计域，可得到不同激光装置的最优黑腔构型。

中文关键词： 惯性约束聚变；黑腔形状设计；辐射对称性；耦合效率

英文摘要： High-temperature and high-quality X-ray source generated from the warmed wall of hohlraum by incident lasers is an important means to conduct research on hydrodynamics, high-pressure equations of state, radiation transport, and atomic parameter under extreme conditions, which is very meaningful for high energy density physics such as controlled nuclear fusion or astrophysics. Such X-ray radiation and ablation is also utilized to drive the implosion of centrally located capsule in laser indirectly driven Inertial Confinement Fusion (ICF). In such ICF, the hohlraum is usually modelled with simple conical curves such as lines, ellipses, parabolas, or circles, which leads to only a few design parameters allowed for shape optimization, and difficulty in further improving its performance such efficiency and radiation symmetry. A novel representation approach, Non-uniform rational B-spline is proposed to represent the shape of hohlraum in this project, which can be used to uniformly and flexibly represent all the hohlraums for radiation computation, by modifying its control points and their weights. In addition, such flexible representation enables it possible to obtain an optimal shape over a large design domain for the holhraum with more uniform radiation and higher driven temperature on the capsule. Finally, hohlraum physical experiments on Shenguang III laser facility will be carried out to validate their performances including driven temperature and radiation symmetry, and then correct their design for the ICF research. Such approach has significant research and engineering meaning for its much generic representation property, since it can break the limit of current conical curve representation, and substantially expand the design domain to enable obtaining an optimal target for any laser facility.

英文关键词： Inertial Confinement Fusion;Hohlraum shape design;radiation symmetry;coupling efficiency