X-point position dependence of edge intrinsic toroidal rotation on the ă Tokamak a Configuration Variable

56th Annual Meeting of the APS Division of Plasma Physics, New Orleans, ă LA, OCT 27-31, 2014; International audience; Recent theoretical work predicts intrinsic toroidal rotation in the ă tokamak edge to depend strongly on the normalized major radial position ă of the X-point. With this motivation, we conducted a series of Ohmic ă L-mode shots on the Tokamak a Configuration Variable, moving the X-point ă from the inboard to the outboard edge of the last closed flux surface in ă both lower and upper single null configurations. The edge toroidal ă rotation evolved from strongly co-current for an inboard X-point to ă either vanishing or counter-current for an outboard X-point, in ă agreement with the theoretical expectations. The whole rotation profile ă shifted roughly rigidly with the edge rotation, resulting in variation ă of the peak core rotation by more than a factor of two. Core rotation ă reversals had little effect on the edge rotation. Edge rotation was ă slightly more counter-current for unfavorable than favorable del B drift ă discharges. (c) 2015 AIP Publishing LLC.