X-Point-Position-Dependent Intrinsic Toroidal Rotation in the Edge of ă the TCV Tokamak

International audienceEdge intrinsic rotation was investigated in Ohmic L-mode discharges on ă the Tokamak a Configuration Variable, scanning the major radial position ă of the X point, R-X. Edge rotation decreased linearly with increasing ă RX, vanishing or becoming countercurrent for an outboard X point, in ă agreement with theoretical expectations. The core rotation profile ă shifted fairly rigidly with the edge rotation, changing the central ă rotation speed by more than a factor of two. Core rotation reversals had ă little effect on the edge rotation velocity. Edge rotation was modestly ă more countercurrent in unfavorable than favorable del B shots