Imperial College London
Dr Michael Coppins

DrMichaelCoppins

Faculty of Natural Sciences, Department of Physics

Distinguished Research Fellow
 
 
 
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Contact

 

+44 (0)20 7594 7636m.coppins Website

 
 
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Location

 

726Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Simons:2020:10.1063/5.0005392,
author = {Simons, L and Coppins, M},
doi = {10.1063/5.0005392},
journal = {Physics of Plasmas},
pages = {1--10},
title = {Modeling of spherical dust charging in collisionless magnetized plasmas with DiMPl},
url = {http://dx.doi.org/10.1063/5.0005392},
volume = {27},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Determining the equilibrium charge of conducting spheres in plasmas is important for interpreting Langmuir probe measurements, plasma surface interactions, and dust particle behavior. The Monte Carlo code Dust in Magnetised Plasmas (DiMPl) has been developed for the purpose of determining the forces and charging behavior of conducting spheroids under a variety of conditions and benchmarked against previous numerical results. The floating potentials of spheres in isothermal, collisionless, hydrogen plasmas as a function of magnetic field strength and size relative to the Debye length are studied using DiMPl and compared with new results from the N-body tree code (pot) and recent particle in cell measurements. The results of all three simulations are similar, identifying a small range at modest ion magnetization parameters over which the electron current is reduced relative to the ion current. The potential as a function of magnetic field strength is found to be relatively insensitive to dust size for dust smaller than the Debye length. The potential of large dust is found to depend less strongly on flow speed for modest magnetic field strengths and to decrease with increasing flow speed in the presence of strong magnetic fields for smaller dust. A semi-empirical model for the potential of small dust in a collisionless plasma as a function of magnetic field strength is developed, which reproduces the expected currents and potentials in the high and low magnetic field limit.
AU  - Simons,L
AU  - Coppins,M
DO  - 10.1063/5.0005392
EP  - 10
PY  - 2020///
SN  - 1070-664X
SP  - 1
TI  - Modeling of spherical dust charging in collisionless magnetized plasmas with DiMPl
T2  - Physics of Plasmas
UR  - http://dx.doi.org/10.1063/5.0005392
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000540749700001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://aip.scitation.org/doi/10.1063/5.0005392
UR  - http://hdl.handle.net/10044/1/83495
VL  - 27
ER  -
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