Development of a finite element process for the modelling of plasma currents in the edge layers of tokamaks
In recent years, greater efforts have been made to employ finite element methods for plasma edge fluid modelling. Compared with commonly applied procedures, this method has the advantage that multiple-connected domains with complex geometrical structure can be described in detail. The purpose of the present work is to analyse these considerations and to develop a two-dimensional finite element code. This code should be able to simulate the plasma flow pattern in the burning chamber of fusion devices by an exact and solution-dependent discretisation. For the case discussed in this work the classical transport coefficients are retained to compare the solution with results of other calculations and to isolate special features caused by the interaction of strong anisotropic transport with complex geometrical structures: (i) on top of the limiter a fountain-like flow of ions is observed leading to a flow reversal back to the core-plasma; (ii) in the scoops underneath the limiter the plasma density increases along the magnetic field direction because of a spatial focusing of reionised neutral particles. Making use of this effect would render the particle removal more efficient (plasma plugging).
Bibliographic Reference: Report: Jül-2942 DE (1994) 159 pp.
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
Record Number: 199411446 / Last updated on: 1994-12-06
Original language: de
Available languages: de