TJ-II is equipped with two probe systems that allow the simultaneous measurement of the radial and toroidal characteristics of the boundary plasma fluctuations with high temporal resolution. The interplay between long-range toroidal correlations, local cross-field particle transport and radial structure of the edge fluctuations has been investigated. Experimental evidence is presented that both the radial correlation and the turbulent particle transport are reduced in the region dominated by zonal flows (ZFs). Experimental findings show the key role of ZFs in the edge plasma transport regulation.
On the spatial structure of solitary radial electric field at the plasma edge in toroidal confinement devices