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A Two-Dimensional Finite Element Model of the Edge Plasma

✍ Scribed by Roger A. Vesey; Don Steiner

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
668 KB
Volume
116
Category
Article
ISSN
0021-9991

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✦ Synopsis

A new computational model of the edge plasma in axisymmetric magnetic fusion devices has been developed based on finite element methods. Braginskii-type plasma fluid equations and a oneenergy-group neutral particle diffusion equation are spatially discretized on a two-dimensional domain using Galerkin, modified artificial diffusion, and anisotropic streamline-tupwind/Petrov-Galerkin finite element methods. A damped modified Newton method is employed to solve the nonlinear system of discretized equations. Results from assembled plasma/neutral systems in rectangular geometry agree quantitatively with the results from the (B 2) and NEWEDGE finite-difference edge models and highlight the importance of boundary conditions. Finite element analysis of angled divertor plates illustrated the sensitivity of divertor plasma parameters and the divertor plate heat flux profile to the details of nonorthogonal boundary geometry, due to the neutral particle behavior and its subsequent effect on all of the plasma quantities. (0) 1995 Academic Press, Inc.

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