Effects of magnetization on fusion product trapping and secondary neutron spectraa)
Effects of magnetization on fusion product trapping and secondary neutron spectraa)
复制标题
磁化强度对聚变产物俘获和二次中子能谱的影响a)
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Herrmann
中科院分区：
文献类型：
--
作者：
P. Knapp;P. Schmit;S. Hansen;M. Gomez;K. Hahn;D. Sinars;K. Peterson;S. Slutz;A. Sefkow;T. Awe;E. Harding;C. Jennings;M. Desjarlais;G. Chandler;G. Cooper;M. Cuneo;M. Geissel;A. Harvey;J. Porter;G. Rochau;D. Rovang;C. Ruiz;M. Savage;I. Smith;W. Stygar;M. Herrmann
通过磁化惯性约束聚变（ICF）系统中的聚变燃料，可以显着降低所需的停滞压力和密度。发生这种情况是因为磁场将热燃料与冷推进器隔离并捕获带电的聚变燃烧产物。这种捕集允许燃烧产物将能量沉积在燃料中，促进等离子体自加热。在这里，我们报告了在纯轴向磁场磁化的圆柱形 DD 等离子体中这种捕获的综合理论。利用这一理论，我们能够证明二次聚变反应可用于推断聚变燃烧期间的磁场半径乘积 BR。该参数（而非 ρR）是磁化 ICF 中的主要限制参数。使用这种方法，我们分析了最近在桑迪亚国家实验室 Z 机器上进行的磁化衬里惯性聚变实验的数据。我们表明，在这些实验中 BR ≈ 0.34(+0.14/−0.06) MG · cm，BR 比初始值增加了 ∼ 14 倍，并证实了 DD 聚变海卫一在停滞时被磁化。这是通过压缩初始种子磁通量促进带电燃烧产物磁化的首次实验验证。
By magnetizing the fusion fuel in inertial confinement fusion (ICF) systems, the required stagnation pressure and density can be relaxed dramatically. This happens because the magnetic field insulates the hot fuel from the cold pusher and traps the charged fusion burn products. This trapping allows the burn products to deposit their energy in the fuel, facilitating plasma self-heating. Here, we report on a comprehensive theory of this trapping in a cylindrical DD plasma magnetized with a purely axial magnetic field. Using this theory, we are able to show that the secondary fusion reactions can be used to infer the magnetic field-radius product, BR, during fusion burn. This parameter, not ρR, is the primary confinement parameter in magnetized ICF. Using this method, we analyze data from recent Magnetized Liner Inertial Fusion experiments conducted on the Z machine at Sandia National Laboratories. We show that in these experiments BR ≈ 0.34(+0.14/−0.06) MG · cm, a ∼ 14× increase in BR from the initial value, and confirming that the DD-fusion tritons are magnetized at stagnation. This is the first experimental verification of charged burn product magnetization facilitated by compression of an initial seed magnetic flux.