热各向异性驱动的韦伯不稳定性的PIC模拟：饱和时的场增长和相空间演化
PIC simulations of the Thermal Anisotropy-Driven Weibel Instability: Field growth and phase space evolution upon saturation
摘要：
本文用PIC方法研究了初始未磁化的空间均匀电子等离子体的韦伯不稳定性。这种由热各向异性电子分布驱动的不稳定性产生波矢量垂直于较高温度方向的电磁波。执行两个模拟：一个二维的模拟，与模拟平面，包括较高的温度的方向，证明了波谱最初被限制在一个维度。由不稳定性产生的模拟平面中的电场分量在模拟结束时通过二次不稳定性均衡。具有高分辨率的1D PIC模拟，其中模拟框与生长波的波矢量对齐，揭示了电子相空间分布的细节，并允许当不稳定性饱和时比较磁场和电场。结果表明，静电场是由磁压梯度驱动的，它和磁场一起使电子在空间重新分布。
英文摘要：
The Weibel instability is investigated with PIC simulations of an initially unmagnetized and spatially uniform electron plasma. This instability, which is driven by the thermally anisotropic electron distribution, generates electromagnetic waves with wave vectors perpendicular to the direction of the higher temperature. Two simulations are performed: A 2D simulation, with a simulation plane that includes the direction of higher temperature, demonstrates that the wave spectrum is initially confined to one dimension. The electric field components in the simulation plane generated by the instability equalize at the end of the simulation through a secondary instability. A 1D PIC simulation with a high resolution, where the simulation box is aligned with the wave vectors of the growing waves, reveals details of the electron phase space distribution and permits a comparison of the magnetic and electric fields when the instability saturates. It is shown that the electrostatic field is driven by the magnetic pressure gradient and that it and the magnetic field redistribute the electrons in space.
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