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

Abstract

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.

arXiv comment5 pages, 4 figures. http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.035002. "Copyright (2014) by the American Physical Society."

References in corpus (4)

• Attractive Potential around a Thermionically Emitting Microparticle
• Orbital-motion-limited theory of dust charging and plasma response
• CPIC: a Curvilinear Particle-In-Cell code for plasma-material interaction studies
• Survivability of dust in tokamaks: dust transport in the divertor sheath

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• Thermionic Cooling of the Target Plasma to a Sub-eV Temperature
• Comparison of dust charging between Orbital-Motion-Limited theory and Particle-In-Cell simulations
• Intense boundary emission destroys normal radio-frequency plasma sheath
• A critique of "quantum dusty plasmas"