Abstract
In tokamak plasma, the edge region is characterized by larger gradients, higher resisitivity and a shorter distance to the critical compared to core plasma. By edge region, we mean the region where the pedestal forms when transiting from the L to H-mode: . This paper shows, using a three-dimensional electromagnetic fluid turbulent transport model, that the quasilinear hypothesis is valid in the edge region. The diamagnetic coupling is stabilizing while is destabilizing. The effect of on the characteristic times of turbulence is studied, as is its effect on the Reynolds stress and the Maxwell stress in these fluid simulations.
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