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Title: Coulomb expansion of a thin dust cloud observed experimentally under afterglow plasma conditions

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0112680· OSTI ID:1903251

The Coulomb expansion of a thin cloud of charged dust particles was observed experimentally, in a plasma afterglow. This expansion occurs due to mutual repulsion among positively charged dust particles, after electrons and ions have escaped the chamber volume. In the experiment, a two-dimensional cloud of dust particles was initially levitated in a glow-discharge plasma. The power was then switched off to produce afterglow conditions. The subsequent fall of the dust cloud was slowed by reversing the electric force, to an upward direction, allowing an extended observation. At early time, measurements of the Coulomb expansion in the horizontal direction are found to be accurately modeled by the equation of state for a uniformly charged thin disk. Finally, bouncing from the lower electrode was found to be avoided by lowering the impact velocity <100 mm/s.

Research Organization:
Univ. of Iowa, Iowa City, IA (United States)
Sponsoring Organization:
USDOE; National Science Foundation (NSF)
Grant/Contract Number:
SC0014566; PHY-1740379; 1672641
OSTI ID:
1903251
Alternate ID(s):
OSTI ID: 1897759; OSTI ID: 1972226
Journal Information:
Physics of Plasmas, Vol. 29, Issue 11; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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