This work details a model used to infer the 3-D structure of the stagnated hot-spot and shell of inertial confinement fusion implosion experiments at the National Ignition Facility. The model assumes that 3-D low-mode drive perturbations can account for the majority of stagnation asymmetries experimentally observed. It uses an adaptive sampling algorithm to navigate the 24-D input parameter space to find a 3-D x-ray flux asymmetry whose application to an otherwise symmetric implosion results in a consistent match between synthetic and experimental diagnostic observables. The model is applied to a series of experiments and is able to achieve a consistent match for over 41 different observables, providing a high-fidelity reconstruction of the stagnation hot-spot and shell profile.

中文翻译：

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NIF 点火实验的 3-D 结构建模

这项工作详细介绍了一个模型，该模型用于推断国家点火设施惯性约束聚变内爆实验的停滞热点和外壳的 3-D 结构。该模型假设 3-D 低模驱动扰动可以解释实验观察到的大部分停滞不对称。它使用自适应采样算法来导航 24-D 输入参数空间，以找到 3-D X 射线通量不对称性，将其应用于其他对称内爆导致合成和实验诊断观测值之间的一致匹配。该模型应用于一系列实验，能够对超过 41 个不同的观测值实现一致匹配，提供停滞热点和壳轮廓的高保真重建。