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• W2056577841 abstract "The simulation of ion extraction from a quasineutral plasma is described using a two-dimensional time-dependent numerical fluid equation code, flow. Ion motion is treated using the cold ion continuity and momentum conservation equations in the potential field of complex structures. An upwind differencing scheme in Cartesian coordinates is used to solve these fluid equations. The plasma electrons are modeled as having a Maxwell–Boltzmann distribution, which allows for ion acoustic effects inside the plasma. The growth and evolution of two-dimensional ion sheaths is treated while evaluating the ion flux collected on the extractor surface. It is found that spatial grids very much coarser than the Debye length (of order ten times larger or greater) can be successfully used to accurately model ion extraction. Although the transition region between the high density quasi-neutral plasma and the ion sheath is not resolved, the ion flux across this region is still obtained correctly. The assumption of a Maxwell–Boltzmann distribution for the electrons requires the solution of a highly nonlinear Poisson equation. Previous approaches to this problem have relied upon a Newton–Raphson root search with standard iterative techniques for the resulting linearized equations. A new methodology is described here using the recently developed strongly implicit procedure (SIP), which has been optimized for the discretized two-dimensional Laplace operator." @default.
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• W2056577841 date "1992-06-01" @default.
• W2056577841 modified "2023-10-16" @default.
• W2056577841 title "Flow: A two-dimensional time-dependent hydrodynamical ion extraction model" @default.
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• W2056577841 doi "https://doi.org/10.1063/1.860055" @default.
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