Effects of dust size distribution on dust acoustic waves in magnetized two-ion-temperature dusty plasmas

2008 ◽  
Vol 15 (8) ◽  
pp. 083702 ◽  
Author(s):  
Zong-ming Liu ◽  
Wen-shan Duan ◽  
Guang-jun He
Keyword(s):  
Size Distribution ◽  
Acoustic Waves ◽  
Dusty Plasmas ◽  
Ion Temperature ◽  
Dust Acoustic Waves ◽  
Dust Size Distribution ◽  
Dust Acoustic

The effect of a dust-size distribution on dust acoustic waves

1997 ◽  
Vol 58 (4) ◽  
pp. 691-704 ◽  
Author(s):  
A. BRATTLI ◽  
O. HAVNES ◽  
F. MELANDSØ
Keyword(s):  
Size Distribution ◽  
Power Law ◽  
Acoustic Waves ◽  
Landau Damping ◽  
Size Distributions ◽  
Dust Acoustic Waves ◽  
Charge Variation ◽  
Dust Charge ◽  
Dust Size Distribution ◽  
Dust Acoustic

Using a kinetic model for low-frequency dust acoustic waves (DAW) in a dusty plasma, we have examined the effects of a dust-size distribution on their propagation and damping. Both Landau damping and damping due to dust-charge variation are included. We consider Gaussian and power-law dust-size distributions. In accordance with earlier results of Melandsø et al., we find that the dust Landau damping dominates at short wavelengths. At wavelengths longer than the Debye length λD0, the dust-charge variation is generally dominant. It is always dominant for the power-law size distributions that we have studied. We also find that if the upper and lower size limits of the dust are chosen so that the average dust size remains constant, regardless of the power-law exponent γ, the wave properties are practically identical to those of a monosize distribution of the average dust size. For a Gaussian dust-size distribution, Landau damping may be the dominant damping mechanism if the dust plasma is tenuous (P[Lt ]1) and the width of the distribution is large.

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