Landau damping of dust acoustic waves in a Lorentzian plasma

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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 kud≪ω≪ kui≪kue, where uα is the thermal velocity of species a(=i,e,d). The damping rate is shown to be dependent on the spectral index κ as well as the ratio of ion density to electron. The maximum Landau damping rate is derived and found to be approximately 0.2σκωpd where ωpd is the dust plasma frequency and σκ is a κ-dependent factor, which has the maximum value of 1.33 (for the smallest κ) and reduces to unity as the nonthermal effect disappears.

Original languageEnglish
Article number032112
JournalPhysics of Plasmas
Issue number3
StatePublished - 2007 Apr 8

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