Journal
PHYSICS OF PLASMAS
Volume 29, Issue 11, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0112680
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Funding
- Army Research Office under MURI [W911NF-18-1-0240]
- United States Department of Energy [DE-SC0014566]
- National Science Foundation [PHY-1740379]
- NASA/JPL RSA [1672641]
- U.S. Department of Energy (DOE) [DE-SC0014566] Funding Source: U.S. Department of Energy (DOE)
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The Coulomb expansion of a thin cloud of charged dust particles was experimentally observed in a plasma afterglow. By reversing the electric force and reducing the impact velocity, bouncing from the lower electrode was avoided.
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. (C) 2022 Author(s).
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