Landau damping of dust acoustic waves in a Lorentzian plasma
- BK21 Program Division of Advanced Research and Education in Physics, Department of Physics, Hanyang University, Seoul 133-791 (Korea, Republic of)
The Landau damping of dust acoustic waves propagating in a dusty plasma modeled by a Lorentzian (kappa) distribution for electrons and ions, and by a Maxwellian distribution for the dust grains is kinetically investigated. The dust acoustic waves are found in the range of kv{sub d}<<{omega}<<kv{sub i}<<kv{sub e}, where v{sub {alpha}} is the thermal velocity of species {alpha}(=i,e,d). The damping rate is shown to be dependent on the spectral index {kappa} as well as the ratio of ion density to electron. The maximum Landau damping rate is derived and found to be approximately 0.2{sigma}{sub {kappa}}{omega}{sub pd} where {omega}{sub pd} is the dust plasma frequency and {sigma}{sub {kappa}} is a {kappa}-dependent factor, which has the maximum value of 1.33 (for the smallest {kappa}) and reduces to unity as the nonthermal effect disappears.
- OSTI ID:
- 20974871
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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