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

Ali, S and Eliasson, B (2017) Slow test charge response in a dusty plasma with Kappa distributed electrons and ions. Physica Scripta, 92 (8). 084003. ISSN 0031-8949

[img]
Preview
Text (Ali-Eliasson-PS-2017-Slow-test-charge-response-in-a-dusty-plasma-with-Kappa)
Ali_Eliasson_PS_2017_Slow_test_charge_response_in_a_dusty_plasma_with_Kappa.pdf
Final Published Version
License: Creative Commons Attribution 3.0 logo

Download (575kB)| Preview

    Abstract

    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.