Incorporating kinetic effects on Nernst advection in inertial fusion simulations
Incorporating kinetic effects on Nernst advection in inertial fusion simulations
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DOI：
10.1088/1361-6587/aaca0b
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发表时间：
2018-08-01
影响因子：
2.2
通讯作者：
Ridgers, C. P.
中科院分区：
文献类型：
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作者：
Brodrick, J. P.;Sherlock, M.;Ridgers, C. P.
我们提出了一种简单的方法，将陡峭温度梯度下磁场能斯特平流的非局域效应纳入其中，并在许多惯性聚变场景中证明了其有效性。这是基于假设能斯特速度和热流速度之间的关系不受非定域性影响。通过比较 Vlasov-Fokker-Planck 和通量限制的经典输运模拟，这一假设的有效性在各种等离子体条件下得到了证实。此外，我们观察到，Righi-Leduc 热流由于依赖于电子分布函数的高速矩而受到非定域性的影响更严重，但无法提出在流体模拟中解释这一点的可靠方法。
We present a simple method to incorporate nonlocal effects on the Nernst advection of magnetic fields down steep temperature gradients, and demonstrate its effectiveness in a number of inertial fusion scenarios. This is based on assuming that the relationship between the Nernst velocity and the heat flow velocity is unaffected by nonlocality. The validity of this assumption is confirmed over a wide range of plasma conditions by comparing Vlasov-Fokker-Planck and flux-limited classical transport simulations. Additionally, we observe that the Righi-Leduc heat flow is more severely affected by nonlocality due to its dependence on high velocity moments of the electron distribution function, but are unable to suggest a reliable method of accounting for this in fluid simulations.