Comparison of fluid neutral models for one-dimensional plasma edge modeling with a finite volume solution of the Boltzmann equation

• DOI: 10.1063/1.4940309
• Publication Date: 2016-01-21T19:12:09Z
• Authors: N. Horsten; W. Dekeyser; G. Samaey; M. Baelmans
• Keywords: Heavy traffic approximation; Momentum (technical analysis); Momentum diffusion; Plasma Modeling

We derive fluid neutral approximations for a simplified 1D edge plasma model, suitable to study the behavior close target of nuclear fusion divertor, and compare its solutions solution corresponding kinetic Boltzmann equation. The is considered as fixed background extracted from detached 2D simulation. show that Maxwellian equilibrium distribution already obtained very target, justifying use approximation. three models: (i) diffusion model; (ii) pressure-diffusion model (i.e., combination continuity momentum equation) assuming equal ion temperatures; (iii) coupled energy equation taking into account temperature differences between neutrals ions. Partial reflection reaching boundaries included in both models. propose two methods obtain an incident flux boundary condition one based on approximation other truncated Chapman-Enskog distribution. predicts sources well. gives slightly better results overall. Although including still improves results, assumption good