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Low frequency tokamak edge turbulence is modelled numerically using gyrofluid equations for electrons and ions on an equal footing. Shear AlfvÚn dynamics is included for the electrons. Computations are in a flux tube model built from an actual MHD equilibrium, representing the ASDEX Upgrade flux surface shape. Turbulence is similar to that in the fluid model, but is now well behaved at all wavelengths compared to the ion gyroradius. Geometric effects are important in surpressing ideal ballooning modes at L-mode parameters. Transport fluxes are close to experimental values. No transition boundaries intrinsic to the turbulence are found, suggesting the need for nonlocal models incorporating profile dynamics to treat the L-to-H transition and the H-mode density limit.

Additional information

Authors: SCOTT B, Max-Planck Institut f³r Plasmaphysik, EURATOM Association, Garching bei M³nchen (DE)
Bibliographic Reference: Article: Theory of Fusion Plasmas (2000) pp. 359-372
Availability: Theory of Fusion Plasmas (Journal)
Record Number: 200012127 / Last updated on: 2000-07-12
Original language: en
Available languages: en