Xia, HuaShats, MichaelPunzmann, Horst2015-12-070031-9007http://hdl.handle.net/1885/21682We report the first experimental observation of stationary zonal flow in the transport-barrier region of the H-mode plasma. Strong peaks in Er shear mark the width of this region. A strong m=n=0 low-frequency (f<0.6kHz) zonal flow is observed in regions of increased Er, suggesting a substantial contribution of zonal flow to the spatial modulation of Er radial profiles. Radial localization of the zonal flow is correlated with a region of zero magnetic shear and low-order (7/5) rational surfaces.Keywords: Correlation methods; Magnetic fluids; Shear flow; Surface properties; Transport properties; H-mode plasma; Stationary zonal flow; Transport barrier region; Zero magnetic shear; Plasma flow200610.1103/PhysRevLett.97.2550032015-12-07