Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions
Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions
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DOI：
10.1063/1.5091449
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发表时间：
2019-05-01
影响因子：
2.2
通讯作者：
Edwards, M. J.
中科院分区：
文献类型：
--
作者：
Clark, D. S.;Weber, C. R.;Edwards, M. J.
在国家点火装置（NIF）上实现惯性约束点火等离子体的目标[M. L. Spaeth，Fusion Sci. 69，25（2016）]仍然难以捉摸。然而，人们对限制电流内爆性能的因素有了越来越多的了解。有了这样的理解，问题自然出现了：最终需要什么条件才能实现点火，要么通过继续改善当前内爆的质量，要么通过流体动力学将这些内爆扩展到未来某个设施上的更大驱动能量？考虑到NIF内爆的复杂性，回答这个问题必须在很大程度上依赖于复杂的数值模拟。特别是，这些模拟必须尊重真实的NIF内爆的三维性，并解决许多扰动源，降低他们的广泛的尺度。这篇招股说明书文章回顾了NIF内爆详细建模的现状，从最近的实验中，该建模意味着点火的缩放，以及未来建模技术改进的领域，这些改进可以增加理解并进一步增强预测能力。由于任何外推法都有其固有的不确定性，特别是对于点火这样的非线性过程，在实际实验证明之前，对点火的要求不会有明确的答案。然而，随着建模技术的不断改进和NIF经验基础的不断增长，对点火的要求变得越来越清楚。由AIP Publishing授权出版。
The goal of an inertially confined, igniting plasma on the National Ignition Facility (NIF) [M. L. Spaeth, Fusion Sci. Technol. 69, 25 (2016)] remains elusive. However, there is a growing understanding of the factors that appear to be limiting current implosion performance. And with this understanding, the question naturally arises: What conditions will ultimately be required to achieve ignition, either by continuing to improve the quality of current implosions, or by hydrodynamically scaling those implosions to larger driver energies on some future facility? Given the complexity of NIF implosions, answering this question must rely heavily on sophisticated numerical simulations. In particular, those simulations must respect the three-dimensionality of real NIF implosions and also resolve the wide range of scales for the many perturbation sources that degrade them. This prospectus article reviews the current state of detailed modeling of NIF implosions, the scaling to ignition from recent experiments that that modeling implies, and areas for future improvements in modeling technique that could increase understanding and further enhance predictive capabilities. Given the uncertainties inherent in any extrapolation, particularly for a process as nonlinear as ignition, there will be no definitive answer on the requirements for ignition until it is actually demonstrated experimentally. However, with continuing improvements in modeling technique and a growing experience base from NIF, the requirements for ignition are becoming clearer. Published under license by AIP Publishing.