The inadequacy of a magnetohydrodynamic approach to the Biermann battery.
The inadequacy of a magnetohydrodynamic approach to the Biermann battery.
复制标题
比尔曼电池的磁流体力学方法的不足。
DOI:
10.1098/rsta.2020.0017
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发表时间:
2021-01-25
期刊:
影响因子:
--
通讯作者:
Kingham RJ
中科院分区:
文献类型:
--
作者:
Ridgers CP;Arran C;Bissell JJ;Kingham RJ
Magnetic fields can be generated in plasmas by the Biermann battery when the electric field produced by the electron pressure gradient has a curl. The commonly employed magnetohydrodynamic (MHD) model of the Biermann battery breaks down when the electron distribution function is distorted away from Maxwellian. Using both MHD and kinetic simulations of a laser-plasma interaction relevant to inertial confinement fusion we have shown that this distortion can reduce the Biermann-producing electric field by around 50%. More importantly, the use of a flux limiter in an MHD treatment to deal with the effect of the non-Maxwellian electron distribution on electron thermal transport leads to a completely unphysical prediction of the Biermann-producing electric field and so results in erroneous predictions for the generated magnetic field. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 2)’.
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