Strong ExB shear flows in the pedestal region in H-mode plasma

Details Strong ExB shear flows in the pedestal region in H-mode plasma Strong ExB shear flows in the pedestal region in H-mode plasma

2006-07-28

arxiv.org/abs/physics/0607256v2

Physical Review Letters, Vol 97, No 25, P255003, Dec, 2006

Physics

Plasma Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.255003

We report the first experimental observation of stationary zonal flows in the pedestal region of the H-mode plasma in the H-1 toroidal heliac. Strong peaks in E_r shear mark the top and foot of the density pedestal. Strong m=n=0 low-frequency (f < 0.6 kHz) zonal flows are observed in regions of increased E_r, suggesting substantial contribution of zonal flows to the spatial modulation of E_r radial profiles. Radial localization of zonal flows is correlated with a region of zero magnetic shear and low-order (7/5) rational surfaces.

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