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The effects of electron energy distribution function on the plasma sheath structure in the presence of charged nanoparticles

Published online by Cambridge University Press:  17 March 2020

H. Khalilpour Open the ORCID record for H. Khalilpour [Opens in a new window]  and
G. Foroutan
H. Khalilpour*
Affiliation:
Physics Department, Payame Noor University, 19395-4697, Tehran, Iran
G. Foroutan
Affiliation:
Physics Department, Faculty of Science, Sahand University of Technology, 51335-1996, Tabriz, Iran
*
†Email address for correspondence: h_khalilpour@pnu.ac.ir
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Abstract

The effects of the electron energy distribution function (EEDF) on the structure of a dusty plasma sheath are investigated. Here, it is assumed that the electrons obey a Druyvesteyn-type distribution with a parameter $x$ controlling the shape of the EEDF. The Druyvesteyn-like distribution tends to a Maxwellian distribution as $x$ varies from 2 to 1. Using the orbital motion limited theory, the incident electron current on the dust is evaluated for a given $x$. The results of numerical simulations are compared with those of a Maxwellian distribution. It was found that the sheath dynamics depends strongly on the magnitude of $x$. The sheath thickness increases monotonically with increasing $x$. However, the absolute dust charge decreases and, as a result, the accelerating ion drag force is weakened and thus the dust number density is enhanced. For a plasma with a Druyvesteyn-like distribution, the Bohm speed is a function of $x$ and increases with increasing $x$.

Keywords

dusty plasmasplasma sheaths
Type
Research Article
Information
Journal of Plasma Physics , Volume 86 , Issue 2 , April 2020 , 905860206
Copyright
© Cambridge University Press 2020

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