Investigation of surface boundary conditions for continuum modeling of RF plasmas

Wilson, Althea; Shotorban, Babak

doi:10.1063/1.5020983

Cited by 7 publications

(2 citation statements)

References 47 publications

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“…Details of the numerical methods used for the plasma simulation were provided in a previous work 42 with a summary here. The time derivatives in the plasma equations use a second order scheme and the equations are iterated until the system is solved simultaneously.…”

Section: Methodsmentioning

confidence: 99%

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Effects of collision-enhanced charging on dust crystal

Wilson

Shotorban

2021

Physics of Plasmas

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Numerical simulations of monolayer dust crystals in an RF complex plasma were performed to examine the crystal structure and quantify the effects of including the collision enhanced ion current in the charging model. A GEC cell similar to a previous experimental work was modeled for a range of RF voltages, using a continuum description for the plasma and a particle description for dust grains. The time history of each dust grain was monitored. The dust charge was computed using both the OML and the collision enhanced charging (CEC) model applicable to the sheath region. The dust model accounted for the electric force, ion drag force, neutral drag force, gravity, and the ion wake. The CEC model produced a lower charge and lower electric force which agreed better with the experimental data. Then dust crystals composed of 40 to 100 grains were modeled and the levitation height and inter-particle spacing of the resulting crystals was examined. Including the collision enhanced current reduced the inter-particle spacing but only had a minor effect on the levitation height.

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Section: Methodsmentioning

confidence: 99%

“…The plasma model, which was presented in detail and validated previously 42 , is based on a continuum description using a second-order local mean energy approximation 43 . In this model, the equations governing the electron number density n e , ion number density n i , and electron energy density ω e are:…”

Section: Governing Equations a Plasma Equationsmentioning

confidence: 99%