Three-dimensional simulations of National Ignition Facility implosions: Insight into experimental observablesa)
Three-dimensional simulations of National Ignition Facility implosions: Insight into experimental observablesa)
复制标题
国家点火装置内爆的三维模拟：洞察实验观测a)
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
J. Kilkenny
中科院分区：
文献类型：
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作者：
B. Spears;D. Munro;S. Sepke;J. Caggiano;D. Clark;R. Hatarik;A. Kritcher;D. Sayre;C. Yeamans;J. Knauer;T. Hilsabeck;J. Kilkenny
我们在三维模拟流体力学，同时，x射线和中子诊断特征的国家点火设施（NIF）内爆。我们应用非对称辐射驱动来研究低模不对称对诊断观测值的影响。我们检查了这些扰动内爆的x射线和中子图像以及中子谱。x射线图像显示了小长度尺度和短时间尺度上的热点演化，反映了模拟中看到的不完全停滞。中子图像显示出与x射线图像惊人的差异。中子谱提供了内爆不对称性的额外测量。热点的流动改变了中子谱峰，即峰的位置和宽度。宽度的变化导致视温度随观察角度的变化，这表明潜在的热点不对称。我们将基于模拟数据的新期望与NIF数据进行比较。我们发现最近的一些低温分层实验显示出明显的温度各向异性，表明在热点处存在残余流动。我们还发现数据中的一些趋势不能反映我们的模拟和理论认识。
We simulate in 3D both the hydrodynamics and, simultaneously, the X-ray and neutron diagnostic signatures of National Ignition Facility (NIF) implosions. We apply asymmetric radiation drive to study the impact of low mode asymmetry on diagnostic observables. We examine X-ray and neutron images as well as neutron spectra for these perturbed implosions. The X-ray images show hot spot evolution on small length scales and short time scales, reflecting the incomplete stagnation seen in the simulation. The neutron images show surprising differences from the X-ray images. The neutron spectra provide additional measures of implosion asymmetry. Flow in the hot spot alters the neutron spectral peak, namely, the peak location and width. The changes in the width lead to a variation in the apparent temperature with viewing angle that signals underlying hot spot asymmetry. We compare our new expectations based on the simulated data with NIF data. We find that some recent cryogenic layered experiments show appreciable temperature anisotropy indicating residual flow in the hot spot. We also find some trends in the data that do not reflect our simulation and theoretical understanding.
扰动和径向分布对惯性约束聚变热点点火的影响
影响因子：
2.2
作者：
Taylor S
通讯作者：
Taylor S