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Interchange Instability Turbulence Model in Edge Tokamak Plasma
Author(s) -
Benkadda S.,
Garbet X.,
Verga A.
Publication year - 1994
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150340224
Subject(s) - instability , tokamak , turbulence , physics , zonal flow (plasma) , mechanics , plasma , convection , classical mechanics , nuclear physics
Interchange instability is investigated as a plausible mechanism to drive turbulence in the tokamak scrape‐off‐layer. By averaging density and electrostatic potential fluid equations along field lines, a reduced two dimensional model is obtained. Similarly to Rayleigh‐Bénard convection, interchange instability shows a instability threshold and presents localised modes (with a simple geometry and boundary conditions). The nonlinear, turbulent, behaviour of the model is investigated using numerical simulations. Preliminary results show a self‐organization of the flow in coherent structures with a departure from gaussian statistics.