期刊
PHYSICS OF PLASMAS
卷 29, 期 11, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0110379
关键词
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资金
- U.S. Department of Energy Office of Fusion Energy Sciences [DE-SC0018276, 89233218CNA000001]
- U.S. Department of Energy Office of Advanced Scientific Computing Research [DE-SC0018276, 89233218CNA000001]
- Director's Postdoctoral Fellowship at LANL
- U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
- U.S. Department of Energy (DOE) [DE-SC0018276] Funding Source: U.S. Department of Energy (DOE)
In this study, an expression for the Bohm speed in the presheath-sheath transition region is derived from a set of anisotropic plasma transport equations. The accuracy of this expression is validated by comparing it with kinetic simulation results.
The ion exit flow speed at the sheath entrance is constrained by the Bohm criterion, which is used as a boundary condition for simulations that do not resolve the sheath region. Traditional Bohm criterion analysis invokes the equation of state and, thus, ignores transport physics in the sheath transition problem. An expression for the Bohm speed away from the asymptotic limit is derived from a set of anisotropic plasma transport equations. The thermal force, collisional temperature isotropization, and heat flux enter into the evaluation of the Bohm speed. By comparison with kinetic simulation results, this expression is shown to be accurate in the presheath-sheath transition region rather than a single point at the sheath entrance over a broad range of collisionality.
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