Dust-acoustic instability driven by drifting ions and electrons in the dust plasma with Lorentzian kappa distribution

Details Dust-acoustic instability driven by drifting ions and electrons in the dust plasma with Lorentzian kappa distribution Dust-acoustic instability driven by drifting ions and electrons in the dust plasma with Lorentzian kappa distribution

2009-12-27

arxiv.org/abs/0912.4994v1

Physics of Plasmas, 16(2009)123707

Physics

Plasma Physics

14 pages, 4 figures,25 references

Scientific paper

10.1063/1.3274459

The instability of the dust-acoustic waves driven by drifting electrons and ions in a dusty plasma is investigated by the kinetic theory. All the plasma components (electrons, ions and dust particles) are assumed to be the Lorentzian kappa-distributions. The spectral indexes kappa of the kappa-distributions for the three plasma components are different from each other. The obtained instability growth rate depends on the physical quantities of the plasma not only, but on the spectral indexes. The numerical results for the kappa-effect on the instability growth rate show that, if the normalized wave number is small, the index of electrons has a stabilized effect on the dust acoustic waves and the index of ions has an instability effect on the waves, but if the normalized wave number is large, they both nearly have no any effect on the waves. In reverse, the index of dust grains has nearly no any effect on the instability growth rate if the normalized wave number is small, but it has a stabilized effect on the dust waves if the normalized wave number is large.

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