Characterization of turbulent eddies and their associated transport

The internal electric field of turbulent eddies has been experimentally measured by a two-dimensional Langmiur probe array, which shows potential peak or valley in both radial and poloidal directions. This is consistent the expectation that the internal electric field of turbulent eddies either points towards the center or away from the center in both poloidal and radial directions. Fluctuating electron temperature and density associated with turbulent eddies have also been measured, in both L-mode and H-mode, and through the L-H transitions as well. The phase of the fluctuation velocity in all of the above discharges, including the case during ELMs, show that eddies mediated the turbulent momentum in such a way to enhance the mean ExB shear flow in the edge.