Abstract
The nature of plasma edge turbulence has been studied in the Reversed Field Pinch (RFP) RFX-mod, making use of a Gas Puffing Imaging (GPI) diagnostic, with high time (2 MHz) and space (5 mm) resolution. The edge turbulence has been characterized in terms of toroidal phase velocity of fluctuations, v ϕ , of the width of emission structures, 2 σ, and of their linear density in the toroidal direction. The packing fraction ƒ p of intermittent structures has been estimated as the fraction of occupied area in a plane perpendicular to the magnetic field. The behaviors of v ϕ , ƒ p, and 2 σ are reported as functions of the density normalized to its Greenwald value, n/n G . A comparison at different plasma regimes of an effective diffusion coefficient D p due to the plasma trapped in coherent structures has been discussed. A decreasing trend of D p with n/n G values has been guessed.
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