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Phys. Rev. Lett. 97, 255003 (2006) [4 pages]

Strong ExB Shear Flows in the Transport-Barrier Region in H-Mode Plasma

H. Xia, M. G. Shats, and H. Punzmann
Plasma Research Laboratory, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia
Received 31 July 2006; published 20 December 2006

We 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<0.6 kHz) 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.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.97.255003
DOI: 10.1103/PhysRevLett.97.255003
PACS: 52.25.Fi; 52.25.Gj; 52.55.-s
  • 52.25.Fi
    Plasma transport properties
  • 52.25.Gj
    Plasma fluctuation and chaos phenomena
  • 52.55.-s
    Magnetic plasma confinement and equilibrium
  • YEAR: 2006

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