Self-Generated Magnetic Fields in the Stagnation Phase of Indirect-Drive Implosions on the National Ignition Facility.
Self-Generated Magnetic Fields in the Stagnation Phase of Indirect-Drive Implosions on the National Ignition Facility.
复制标题
国家点火装置间接驱动内爆停滞阶段的自生磁场。
DOI：
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发表时间：
2017
影响因子：
8.6
通讯作者：
B. Appelbe
中科院分区：
文献类型：
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作者：
C. Walsh;J. Chittenden;K. McGlinchey;N. Niasse;B. Appelbe
本文介绍了在美国国家点火装置上进行的惯性约束聚变内爆实验的滞止阶段的三维扩展磁流体动力学模拟，显示了超过10^{4} T的自生磁场。角向高模数扰动产生大的磁场，但局限于冷的、密集的热点表面，这是很难磁化的。当低模扰动也存在时，磁场被注入到热的核心，达到显着的磁化，峰值局部热导率降低大于90%。然而，Righi-Leduc热传输有效地冷却了热点，并降低了中子谱推断的离子温度相比，未磁化的情况下。能斯特效应通过使热点核心去磁而定性地改变结果，同时增加在大热损失的边缘和附近区域的磁化。
Three-dimensional extended-magnetohydrodynamic simulations of the stagnation phase of inertial confinement fusion implosion experiments at the National Ignition Facility are presented, showing self-generated magnetic fields over 10^{4} T. Angular high mode-number perturbations develop large magnetic fields, but are localized to the cold, dense hot-spot surface, which is hard to magnetize. When low-mode perturbations are also present, the magnetic fields are injected into the hot core, reaching significant magnetizations, with peak local thermal conductivity reductions greater than 90%. However, Righi-Leduc heat transport effectively cools the hot spot and lowers the neutron spectra-inferred ion temperatures compared to the unmagnetized case. The Nernst effect qualitatively changes the results by demagnetizing the hot-spot core, while increasing magnetizations at the edge and near regions of large heat loss.