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Ignition and pusher adiabat

机译：点火和推动制剂

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In the last five years, large amounts of high quality data on inertial confinement fusion (ICF) experiments were produced at the National Ignition Facility (NIF). From this data we have significantly advanced our scientific understanding of the physics of thermonuclear (TN) ignition and identified critical issues that must be addressed to achieve a burning hotspot, such as implosion energetics, pusher adiabat, tamping effects, and confinement time. In this paper we present a review of recently developed TN ignition and implosion scaling theory (Cheng et al 2013 Phys. Rev. E 88 041101; Cheng et al 2014 Phys. Plasmas 21 10270) that characterizes the thermodynamic properties of the hotspot and the ignition criteria for ICF. We compare our theoretical predictions with NIF data and find good agreement between theory and experiments. We demonstrate the fundamental effects of the pusher adiabat on the energy partition between the cold shell and the hot deuterium-tritium (DT) gas, and thus on the integrated performance of ICF capsules. Theoretical analysis of NIF experiments (Cheng et al 2015 Phys. Plasmas 22 082704; Melvin et al 2015 Phys. Plasmas 22 022708; Cheng et al 2016 Phys. Plasmas 23 120702) and physical explanations of the discrepancies between theory, data, and simulations are presented. It is shown that the true experimental adiabat of the cold DT fuel can be inferred from neutron image data of a capsule implosion. We show that the ablator mix and preheat in the cold fuel can be estimated from the experimentally inferred hotspot mix. Finally, possible paths forward to reach higher yields at NIF implied by the theory are discussed.
机译：在过去五年中，国家点火装置（NIF）产生了大量关于惯性约束聚变（ICF）实验的高质量数据。从这些数据中，我们大大提高了对热核点火物理的科学理解，并确定了实现燃烧热点必须解决的关键问题，如内爆能量学、推进器绝热、夯实效应和约束时间。在本文中，我们回顾了最近发展的TN点火和内爆定标理论（Cheng等人2013 Phys.Rev.E 88 041101；Cheng等人2014 Phys.Plasmas 21 10270），该理论描述了热点的热力学性质和ICF的点火标准。我们将我们的理论预测与NIF数据进行了比较，发现理论和实验之间有很好的一致性。我们展示了推进器绝热板对冷壳和热氘氚（DT）气体之间能量分配的基本影响，从而对ICF胶囊的综合性能产生影响。本文介绍了NIF实验的理论分析（Cheng等人2015 Phys.Plasmas 22 082704；Melvin等人2015 Phys.Plasmas 22 022708；Cheng等人2016 Phys.Plasmas 23 120702）以及理论、数据和模拟之间差异的物理解释。结果表明，冷DT燃料的真实实验绝热层可以从胶囊内爆的中子图像数据中推断出来。我们表明，烧蚀器混合和冷燃料中的预热可以通过实验推断的热点混合来估计。最后，讨论了该理论所暗示的提高NIF产量的可能途径。

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