Abstract
Tokamak edge turbulence is studied using three dimensional computations in a transcollisional, electromagnetic gyrofluid model. All scales between the ion gyroradius and the profile scale length are carried for up to the transport time scale. Profiles and the MHD equilibrium are time dependently self consistent. Basic properties of the turbulence are shown. Zonal flows are compressible and not in equilibrium, though the electric field profile on larger scales is indeed in equilibrium. Edge turbulence in the closed field line region maintains its character whether a scrape-off layer is present, though in the SOL region it becomes interchange like. Divertor separatrix topology is briefly considered, with little effect on the general turbulence/equilibrium situation. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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