On the effect of ion-neutral collisions on dust grain screening in a low-pressure gas discharge plasma

被引：24

作者：

Semenov, I. L. ^{[1
]}

Zagorodny, A. G. ^{[2
]}

Krivtsun, I. V. ^{[1
]}

机构：

[1] EO Paton Elect Welding Inst, UA-03680 Kiev, Ukraine

[2] Bogolyubov Inst Theoret Phys, UA-03680 Kiev, Ukraine

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 04期

关键词：

Plasma theory - Integral equations - Electric discharges - Electric potential - Collisional plasmas - Collisionless plasmas - Ionization of gases - Dust - Vlasov equation - Kinetic theory - Ions;

D O I：

10.1063/1.3701556

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：

The effect of ion-neutral collisions on charging of micrometer-sized dust grains immersed in a low-pressure argon discharge plasma is studied on the basis of the Vlasov-Bhatnagar-Gross-Krook kinetic equations. The equations are solved numerically using the method described in our previous work [I. L. Semenov et al., Phys. Plasmas 18, 103707 (2011)]. A modified version of the numerical method is proposed to reduce the required computational time. Numerical calculations are carried out for typical plasma parameters used in laboratory investigations of dusty plasma. On the basis of the obtained results, the influence of collisions on the ion flux and grain charge is analyzed. A comparison of our results with those obtained using different analytical models proposed earlier is presented. In addition, applicability of simple kinetic models describing the influence of collisions on the electric potential around a dust grain [S. A. Khrapak et al., Phys. Rev. Lett. 100, 225003 (2008); A. G. Zagorodny et al. Ukr. J. Phys. 54, 1089 (2009)] is examined. The influence of ion-neutral collisions on the distribution of plasma macroparameters near the grain surface is also demonstrated. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3701556]

引用

页数：8

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