Institute of Thermophysics, 630090 Novosibirsk, Russia.
Novosibirsk State University, 630090 Novosibirsk, Russia.
Phys Rev E. 2017 Jun;95(6-1):063207. doi: 10.1103/PhysRevE.95.063207. Epub 2017 Jun 29.
A self-consistent model of plasma polarization around an isolated micron-sized dust particle under the action of an external electric field is presented. It is shown that the quasineutral condition is fulfilled and the formed volume charge totally screens the dust particle. The ion focusing and wake formation behind the dust particle are demonstrated for different ion mean free paths and the external electric fields. It is obtained that at low values of the external electric field the trapped ions play the main role in the screening of the dust particle charge. For high external electric fields, the density of trapped ions decreases and the dust particle is screened mainly by the free ions.
提出了在外电场作用下孤立微米级尘埃颗粒周围等离子体极化的自洽模型。结果表明，满足准中性条件，形成的体积电荷完全屏蔽了尘埃颗粒。针对不同的离子平均自由程和外电场，演示了尘埃颗粒后的离子聚焦和尾流形成。结果表明，在外电场较低时，被俘获离子在屏蔽尘埃颗粒电荷中起主要作用。对于高外电场，被俘获离子的密度减小，尘埃颗粒主要由自由离子屏蔽。
