论文标题
在无碰撞等离子体湍流中识别和表征当前板
Identification and characterization of current sheets in collisionless plasma turbulence
论文作者
论文摘要
通过利用二维杂交数值模拟的结果研究了在离子湍流无碰撞等离子体中形成的电流板的性质。为此，Zhdankin等人提出的算法。 （2013）为分析在MHD驱动等离子体中形成的电流板，扩展了以分析在动力学上较大的动力湍流等离子体中形成的电流板的作用和特性。验证了这种方法对动力扰动的等离子体分析的适用性。所提到的是，例如，参数选择对当前表识别的影响，即。阈值电流密度，最小电流密度和电流密度峰周围的局部区域。主要电流板性能是衍生的，其峰值电流密度，峰值电流载体速度（主要是电子），电流板的厚度和长度，即它们的纵横比（长度/厚度）。通过改变模拟的网格分辨率，可以表明，只要不考虑电子惯性，电流板就会稀薄，远低于离子惯性长度，直到数值（基于网格的基于网格的基于网格）的耗散停止任何进一步的稀疏。
The properties of current sheets forming in a ion-kinetically turbulent collisionless plasma are investigated by utilizing the results of two-dimensional hybrid-kinetic numerical simulations. For this sake the algorithm proposed by Zhdankin et al. (2013) for the analysis of current sheets forming in MHD-turbulent plasmas, was extended to analyse the role and propertes of current sheets formating in a much noisier kinetically turbulent plasma. The applicability of this approach to the analysis of kinetically-turbulent plasmas is verified. Invesigated are, e.g., the effects of the choice of parameters on the current sheet recognition, viz. the threshold current density, the minimum current density and of the local regions around current density peaks. The main current sheet properties are derived, their peak current density, the peak current carrier velocity (mainly electrons), the thickness and length of the current sheets, i.e. also their aspect ratio (length/thickness). By varying the grid resolution of the simulations it is shown that, as long as the electron inertia is not taken into account, the current sheets thin down well below ion inertial length scale until numerical (grid-resolution based) dissipation stops any the further thinning.
