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Dust grain surface potential in a non-Maxwellian dusty plasma with negative ions

Published online by Cambridge University Press:  08 January 2014

A. A. ABID ,
S. ALI  and
R. MUHAMMAD
A. A. ABID
Affiliation:
Department of Applied Physics, Federal Urdu University of Arts, Science and Technology, Islamabad 44000, Pakistan (abidaliabid1@hotmail.com) National Center for Physics, Shahdarah Valley Road, QAU Campus, Islamabad 44000, Pakistan
S. ALI
Affiliation:
National Center for Physics, Shahdarah Valley Road, QAU Campus, Islamabad 44000, Pakistan
R. MUHAMMAD
Affiliation:
Department of Applied Physics, Federal Urdu University of Arts, Science and Technology, Islamabad 44000, Pakistan (abidaliabid1@hotmail.com)
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Abstract

Dust charging processes involving the collection of electrons and positive/negative ions in a non-equilibrium dusty plasma are revisited by employing the power-law kappa (κ)-distribution function. In this context, the current balance equation is solved to obtain dust grain surface potential in the presence of negative ions. Numerically, it is found that plasma parameters, such as the κ spectral index, the negative ion-to-electron temperature ratio (γ), the negative–positive ion number density ratio (α), and the negative ion streaming speed (U0) significantly modify the dust grain potential profiles. In particular, for large kappa values, the dust grain surface potential reduces to the Maxwellian case, and at lower kappa values the magnitude of the negative dust surface potential increases. An increase in γ and U0 leads to the enhancement of the magnitude of the dust grain surface potential, while α leads to an opposite effect. The relevance of present results to low-temperature laboratory plasmas is discussed.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Special Issue 6: Special issue in memory of Professor Padma Kant Shukla 1950-2013 , December 2013 , pp. 1117 - 1121
Copyright
Copyright © Cambridge University Press 2013 

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