One special interest for the industrial development of Hall thruster is characterizing the anomalous cross-field electron transport observed after the channel exit. Since the ionization efficiency is more than 90%, the neutral atom density in that domain is so low that the electron collisions cannot explain the high electron flux observed experimentally. Indeed this is 100 times higher than the collisional transport. In Hall thruster geometry, as ions are not magnetized the electric and magnetic field configuration creates a huge difference in drift velocity between electrons and ions, which generates electron cyclotron drift instability or E × B electron drift instability. Here we are focusing on collision-less chaotic transport of electrons by those unstable modes generated by E × B drift instability. We found that in presence of these electrostatic modes electron dynamics become chaotic. They gain energy from the background waves which increases electron temperature along perpendicular direction by a significant amount, T_perp /T_parallel \approx 4, and a significant amount of crossfield electron transport is observed along the axial direction.

中文翻译：

---

霍尔推进器中 E × B 电子漂移不稳定性引起的电子跨场混沌输运

霍尔推进器工业发展的一项特殊兴趣是表征通道出口后观察到的异常跨场电子传输。由于电离效率超过 90%，该域中的中性原子密度非常低，以至于电子碰撞无法解释实验观察到的高电子通量。事实上，这比碰撞运输高 100 倍。在霍尔推进器几何结构中，由于离子没有被磁化，电场和磁场配置会在电子和离子之间产生巨大的漂移速度差异，从而产生电子回旋漂移不稳定或 E×B 电子漂移不稳定。在这里，我们专注于由 E × B 漂移不稳定性产生的那些不稳定模式的电子无碰撞混沌传输。我们发现在这些静电模式的存在下，电子动力学变得混乱。它们从背景波中获得能量，这使电子温度沿垂直方向显着增加，T_perp /T_parallel \ 约 4，并且沿轴向观察到大量的交叉场电子传输。