The grain charging and the dust acoustic wave instability

被引:4
|
作者
Varma, RK [1 ]
机构
[1] Phys Res Lab, Ahmadabad 380009, Gujarat, India
关键词
D O I
10.1063/1.1372336
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 stability of the steady charging state of the assembly of dust grains in a plasma is analyzed using, besides the equations of continuity and momentum balance, also the equations of thermal energy balance with the grain charging terms for both the electron and ion species. The grain charging terms account for the energy exchange between the dust grains and the electron and ion fluids. The grains are taken to be immobile for the purpose of this analysis. Two limiting cases are analyzed: (i) f(equivalent to4 pin(d)lambda (2)(D)a)<<1 and (ii) f>>1 (n(d) is the dust number density, lambda (D) plasma Debye length, and a, the grain radius). The steady grain charge state is found to be stable in the case f>>1, so that the steady state grain charge q(o) is unaffected. On the other hand, in the limit f>>1, the state is found to be unstable provided gamma (q)(=q(o)e/aT(e)) < 1/2 (T-e-T-i)/T-e (T-e, T-i are electron and ion temperatures). A coherent charging of the dust grains results as a consequence of this instability until <gamma>(q)approximate to 1/2 (T-e-T-i)/T-i. Next, by letting the grain charges be mobile, so that the perturbation of dust number density is nonzero, we examine the stability of the dust-acoustic wave (DAW). The DAW is found to be unstable, also in the f>>1 case, while stable in the f<<1. The instability of the DAW also implies a concomitant grain charge growth, which would again be of a coherent nature. (C) 2001 American Institute of Physics.
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收藏
页码:3154 / 3164
页数:11
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