论文标题
扁电子孔不归因于各向异性屏蔽
Oblate Electron Holes are not attributable to Anisotropic Shielding
论文作者
论文摘要
在理论上和计算上分析了屏蔽机制对多维等离子体电子孔平衡的垂直与平行尺度长度比率的影响。结果表明，调用垂直极化的``旋转''模型基于误解，无法解释观察趋势，即更大的横向范围伴随着较低的磁场。取而代之的是，孔的机翼的潜力在被困电子耗尽的区域之外，具有各向同性屏蔽，给出了$ ϕ \ propto {\ rm e}^{ - r/l/l}/r $，屏蔽长度$ l $与电子热速度较慢的孔相等。细胞模拟中的粒子证实了分析。
Shielding mechanisms' influence on the ratio of perpendicular to parallel scale lengths of multidimensional plasma electron hole equilibria are analyzed theoretically and computationally. It is shown that the ``gyrokinetic'' model, invoking perpendicular polarization, is based on a misunderstanding and cannot explain the observational trend that greater transverse extent accompanies lower magnetic field. Instead, the potential in the wings of the hole, outside the region of trapped-electron depletion, has isotropic shielding giving $ϕ\propto {\rm e}^{-r/L}/r$, with the shielding length $L$ equal to the Debye length for holes much slower than the electron thermal speed. Particle in cell simulations confirm the analysis.
