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Title: Comparison of dust charging between orbital-motion-limited theory and particle-in-cell simulations

Abstract

The Orbital-Motion-Limited (OML) theory has been modified to predict the dust charge and the results were contrasted with the Whipple approximation [X. Z. Tang and G. L. Delzanno, Phys. Plasmas 21, 123708 (2014)]. To further establish its regime of applicability, here, the OML predictions (for a non-electron-emitting, spherical dust grain at rest in a collisionless, unmagnetized plasma) are compared with particle-in-cell simulations that retain the absorption radius effect. It is found that for large dust grain radius rd relative to the plasma Debye length λD, the revised OML theory remains a very good approximation as, for the parameters considered (rdD ≤ 10, equal electron and ion temperatures), it yields the dust charge to within 20% accuracy. This is a substantial improvement over the Whipple approximation. The dust collected currents and energy fluxes, which remain the same in the revised and standard OML theories, are accurate to within 15%–30%.

Authors:
 [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1457245
Alternate Identifier(s):
OSTI ID: 1226393
Report Number(s):
LA-UR-15-24364
Journal ID: ISSN 1070-664X; PHPAEN; TRN: US1901328
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 11; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Maxwell equations; charged currents; interplanetary dust; plasma diagnostics; plasma sheaths; Poisson's equation; plasma density; plasma temperature; electric fields; particle-in-cell method

Citation Formats

Delzanno, Gian Luca, and Tang, Xian-Zhu. Comparison of dust charging between orbital-motion-limited theory and particle-in-cell simulations. United States: N. p., 2015. Web. doi:10.1063/1.4935697.
Delzanno, Gian Luca, & Tang, Xian-Zhu. Comparison of dust charging between orbital-motion-limited theory and particle-in-cell simulations. United States. doi:10.1063/1.4935697.
Delzanno, Gian Luca, and Tang, Xian-Zhu. Wed . "Comparison of dust charging between orbital-motion-limited theory and particle-in-cell simulations". United States. doi:10.1063/1.4935697. https://www.osti.gov/servlets/purl/1457245.
@article{osti_1457245,
title = {Comparison of dust charging between orbital-motion-limited theory and particle-in-cell simulations},
author = {Delzanno, Gian Luca and Tang, Xian-Zhu},
abstractNote = {The Orbital-Motion-Limited (OML) theory has been modified to predict the dust charge and the results were contrasted with the Whipple approximation [X. Z. Tang and G. L. Delzanno, Phys. Plasmas 21, 123708 (2014)]. To further establish its regime of applicability, here, the OML predictions (for a non-electron-emitting, spherical dust grain at rest in a collisionless, unmagnetized plasma) are compared with particle-in-cell simulations that retain the absorption radius effect. It is found that for large dust grain radius rd relative to the plasma Debye length λD, the revised OML theory remains a very good approximation as, for the parameters considered (rd/λD ≤ 10, equal electron and ion temperatures), it yields the dust charge to within 20% accuracy. This is a substantial improvement over the Whipple approximation. The dust collected currents and energy fluxes, which remain the same in the revised and standard OML theories, are accurate to within 15%–30%.},
doi = {10.1063/1.4935697},
journal = {Physics of Plasmas},
number = 11,
volume = 22,
place = {United States},
year = {2015},
month = {11}
}

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