Interpreting inertial fusion neutron spectra
Interpreting inertial fusion neutron spectra
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解释惯性聚变中子谱
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
D. Munro
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文献类型：
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作者：
D. Munro
燃烧的激光聚变等离子体产生的中子谱首先由Brysk（1973 Plasma Phys. Control. Fusion 15 611）。这项工作和最近的工作涉及的频谱产生的一个单一的流体元素。在任何真实的谱中，多个流体元素的温度和速度的分布联合收割机结合在一起;我们推导出中子谱如何平均这些贡献的公式。单元素动量谱是精确的高斯谱，但多元素动量谱具有更高的矩。特别是，偏斜和峰度可能足够大以进行测量。即使是单一的流体元素谱也可能表现出可测量的方向各向异性，因此具有不同视线的仪器应该看到不同的产量、平均速度、平均温度和更高的力矩。最后，我们简要地讨论了如何在坍缩的核心散射修改中子谱通过改变燃料区域的相对权重与不同的温度和速度。
A burning laser fusion plasma produces a neutron spectrum first described by Brysk (1973 Plasma Phys. Control. Fusion 15 611). This and more recent work deals with the spectrum produced by a single fluid element. The distribution of temperatures and velocities in multiple fluid elements combine in any real spectrum; we derive formulas for how the neutron spectrum averages these contributions. The single element momentum spectrum is accurately Gaussian, but the multi-element spectrum exhibits higher moments. In particular, the skew and kurtosis are likely to be large enough to measure. Even the single fluid element spectrum may exhibit measurable directional anisotropy, so that instruments with different lines of sight should see different yields, mean velocities, mean temperatures, and higher moments. Finally, we briefly discuss how scattering in the imploded core modifies the neutron spectrum by changing the relative weighting of fuel regions with different temperatures and velocities.