Slow test charge response in a dusty plasma with Kappa distributed electrons and ions

S Ali, B Eliasson

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The electrostatic potential around a slowly moving test charge is studied in a dusty plasma where the ions and electrons follow a powerlaw Kappa distribution in velocity space. A test charge moving with a speed much smaller than the dust thermal speed gives rise to a short-scale Debye-Hueckel potential as well as a long-range far-field potential decreasing as inverse cube of the distance to the test charge along the propagation direction. The potentials are significantly modified in the presence of high-energy tails, modeled by lower spectral indices in the ion and electron Kappa distribution functions. Plasma parameters relevant to laboratory dusty plasmas are discussed.
Original languageEnglish
Article number084003
Number of pages6
JournalPhysica Scripta
Issue number8
Publication statusPublished - 17 Jul 2017


  • test charge
  • dusty plasma

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