arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01562physics.plasm-ph
收藏

Biermann电池磁流体动力学方法的不足

The inadequacy of a magnetohydrodynamic approach to the Biermann Battery

C. P. Ridgers, C. Arran, J. J. Bissell, R. J. Kingham

摘要:

当电子压力梯度产生的电场具有旋度时,比尔曼电池可以在等离子体中产生磁场。当电子分布函数偏离麦克斯韦分布函数时,Biermann电池的常用磁流体动力学(MHD)模型失效。利用与惯性约束聚变有关的激光-等离子体相互作用的MHD和动力学模拟,我们已经表明,这种畸变可以使产生比尔曼的电场减少约50%。更重要的是,在MHD治疗中使用通量限制器来处理非麦克斯韦电子分布对电子热输运的影响,导致对产生比尔曼的电场的完全非物理预测,从而导致对所产生的磁场的错误预测。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑