The effect of a direct current field on the microparticle charge in the plasma afterglow

被引：28

作者：

Woerner, L. ^{[1
,2
]}

Ivlev, A. V. ^{[1
]}

Coueedel, L. ^{[3
]}

Huber, P. ^{[1
]}

Schwabe, M. ^{[1
,4
]}

Hagl, T. ^{[1
]}

Mikikian, M. ^{[2
]}

Boufendi, L. ^{[2
]}

Skvortsov, A. ^{[5
]}

Lipaev, A. M. ^{[6
]}

Molotkov, V. I. ^{[6
]}

Petrov, O. F. ^{[6
]}

Fortov, V. E. ^{[6
]}

Thomas, H. M. ^{[1
]}

Morfill, G. E. ^{[1
]}

机构：

[1] Max Planck Inst extraterr Phys, D-85741 Garching, Germany

[2] Univ Orleans, CNRS, UMR7344, Grp Rech Energet Milieux Ionises, F-45067 Orleans, France

[3] Aix Marseille Univ, CNRS, Lab Phys Interact Ion & Mol, UMR 7345, F-13397 Marseille 20, France

[4] Univ California, Dept Chem Biomol Engn, Berkeley, CA 94720 USA

[5] Yuri Gagarin Cosmonauts Training Ctr, RU-141160 Star City, Russia

[6] Joint Inst High Temp, RU-125412 Moscow, Russia

来源：

PHYSICS OF PLASMAS | 2013年 / 20卷 / 12期

关键词：

DUST; SHEATH;

D O I：

10.1063/1.4843855

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Residual charges of individual microparticles forming dense clouds were measured in a RF discharge afterglow. Experiments were performed under microgravity conditions on board the International Space Station, which ensured particle levitation inside the gas volume after the plasma switch-off. The distribution of residual charges as well as the spatial distribution of charged particles across the cloud were analyzed by applying a low-frequency voltage to the electrodes and measuring amplitudes of the resulting particle oscillations. Upon "free decharging" conditions, the charge distribution had a sharp peak at zero and was rather symmetric (with charges concentrated between -10e and +10e), yet positively and negatively charged particles were homogeneously distributed over the cloud. However, when decharging evolved in the presence of an external DC field (applied shortly before the plasma switch-off) practically all residual charges were positive. In this case, the overall charge distribution had a sharp peak at about +15e and was highly asymmetric, while the spatial distribution exhibited a significant charge gradient along the direction of the applied DC field. (C) 2013 AIP Publishing LLC.

引用

页数：6

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