论文标题
解决等离子鞘中电子垂直温度峰值的奥秘
Resolving the mystery of electron perpendicular temperature spike in the plasma sheath
论文作者
论文摘要
一大批等离子体的碰撞平均路径比非中性护套宽度长得多，该范围与等离子Debye长度缩放。等离子体，尤其是电子，假设鞘中的温度各向异性较强。鞘流方向（$ t_ {e \ Parallel} $）的温度较低，并且由于加速鞘流的压缩冷却而朝墙壁下降。流场横向的电子温度（$ t_ {e \ perp} $）不仅较高，而且在护套中也升高。 $ t_ {e \ perp} $尖峰的这种异常行为被发现是由于鞘内横向自由度（$ q_ {es} $）的平行热通量的负梯度的结果。非零热通量$ q_ {es} $是通过电子在几乎无碰撞的等离子体中与自我口气的电磁波的相互作用或在碰撞等离子体中的库仑碰撞或在等离子体碰撞的中间状态下诱发的。
A large family of plasmas has collisional mean-free-path much longer than the non-neutral sheath width, which scales with the plasma Debye length. The plasmas, particularly the electrons, assume strong temperature anisotropy in the sheath. The temperature in the sheath flow direction ($T_{e\parallel}$) is lower and drops towards the wall as a result of the decompressional cooling by the accelerating sheath flow. The electron temperature in the transverse direction of the flow field ($T_{e\perp}$) not only is higher but also spikes up in the sheath. This abnormal behavior of $T_{e\perp}$ spike is found to be the result of a negative gradient of the parallel heat flux of transverse degrees of freedom ($q_{es}$) in the sheath. The non-zero heat flux $q_{es}$ is induced by pitch-angle scattering of electrons via either their interaction with self-excited electromagnetic waves in a nearly collisionless plasma or Coulomb collision in a collisional plasma, or both in the intermediate regime of plasma collisionality.
