Charging and heat collection by a positively charged dust grain in a plasma

Dust particulates immersed in a quasineutral plasma can emit electrons in several important applications. Once electron emission becomes strong enough, the dust enters the positively charged regime where the conventional orbital-motion-limited (OML) theory can break down due to potential-well effect...

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Veröffentlicht in:	Physical review letters 2014-07, Vol.113 (3), p.035002-035002, Article 035002
Hauptverfasser:	Delzanno, Gian Luca, Tang, Xian-Zhu
Format:	Artikel
Sprache:	eng
Schlagworte:	Approximation Boundaries Breaking down Charging Collection Dust Flux Mathematical analysis
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creator	Delzanno, Gian Luca Tang, Xian-Zhu
description	Dust particulates immersed in a quasineutral plasma can emit electrons in several important applications. Once electron emission becomes strong enough, the dust enters the positively charged regime where the conventional orbital-motion-limited (OML) theory can break down due to potential-well effects on trapped electrons. A minimal modification of the trapped-passing boundary approximation in the so-called OML(+) approach is shown to accurately predict the dust charge and heat collection flux for a wide range of dust size and temperature.
doi_str_mv	10.1103/PhysRevLett.113.035002
format	Article
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subjects	Approximation Boundaries Breaking down Charging Collection Dust Flux Mathematical analysis
title	Charging and heat collection by a positively charged dust grain in a plasma
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