Capsule modeling of high foot implosion experiments on the National Ignition Facility
Capsule modeling of high foot implosion experiments on the National Ignition Facility
复制标题
国家点火装置高脚内爆实验的胶囊模型
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
S. Sepke
中科院分区：
文献类型：
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作者：
D. Clark;A. Kritcher;J. Milovich;J. Salmonson;C. Weber;S. Haan;B. Hammel;D. Hinkel;M. Marinak;M. Patel;S. Sepke
本文总结了在国家点火装置 (NIF) 上进行的一组高脚内爆实验的详细、仅胶囊模拟的结果。这些实验涵盖了一系列烧蚀体厚度、激光功率和激光能量，将这些实验作为一组进行建模对于评估仿真模型是否可以重现在内爆参数变化时实验中看到的趋势非常重要。二维 (2D) 模拟已经运行，包括许多效应（标称和非标称），例如黑腔辐射不对称、表面粗糙度、胶囊支撑帐篷和热电子预热。还运行了选定的三维模拟来评估二维轴对称近似的有效性。作为一个综合体，这些模拟代表了使用现有的最佳和最详细的计算模型对 NIF 高脚内爆性能的理解的当前状态。虽然最详细的模拟显示与实验数据大致一致，但显然该模型仍然不完整，需要进一步完善。尽管如此，还是明确指出了改进性能的途径。
This paper summarizes the results of detailed, capsule-only simulations of a set of high foot implosion experiments conducted on the National Ignition Facility (NIF). These experiments span a range of ablator thicknesses, laser powers, and laser energies, and modeling these experiments as a set is important to assess whether the simulation model can reproduce the trends seen experimentally as the implosion parameters were varied. Two-dimensional (2D) simulations have been run including a number of effects—both nominal and off-nominal—such as hohlraum radiation asymmetries, surface roughness, the capsule support tent, and hot electron pre-heat. Selected three-dimensional simulations have also been run to assess the validity of the 2D axisymmetric approximation. As a composite, these simulations represent the current state of understanding of NIF high foot implosion performance using the best and most detailed computational model available. While the most detailed simulations show approximate agreement with the experimental data, it is evident that the model remains incomplete and further refinements are needed. Nevertheless, avenues for improved performance are clearly indicated.