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

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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Bibliographic Details
Published in:Physical review letters Vol. 113; no. 3; p. 035002
Main Authors: Delzanno, Gian Luca, Tang, Xian-Zhu
Format: Journal Article
Language:English
Published: United States 18-07-2014
Subjects:
Approximation
Boundaries
Breaking down
Charging
Collection
Dust
Flux
Mathematical analysis
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Summary: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.
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ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.035002