Abstract
Turbulent transport at the edge of a tokamak plasma is characterized by the formation of two types of structures. The first are related to large scale radial transport events (bursts), the second are fluctuations of the poloidal velocity (zonal flows) that regulate transport events. These structures and their dynamics and interplay are studied by 3D numerical simulations of resistive ballooning turbulence. Additionally, a layer of stochastic magnetic field lines is considered where sheared poloidal flows are found to be strongly reduced and long lived eddies appear. As a consequence, the level of convective flux associated with fluctuations is not quenched by the magnetic field perturbation. Finally, the dynamics of transport barriers, generated by externally imposed shear flows is studied. They are found to be intermittently eroded by successions of large bursts, leading to relaxation oscillations of the barrier.
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