Phys. Rev. Lett. 93, 125003 (2004) [4 pages]Formation and Structure of Transport Barriers During Confinement Transitions in Toroidal PlasmaReceived 3 August 2003; published 15 September 2004 Density pedestal formation is studied experimentally during spontaneous low-to-high confinement transitions in the H-1 heliac. Poloidally extended potential structures, or zonal flows, seem to play the major role both in the spatial structure and in the temporal evolution of the pedestal formation. Zonal flows transiently generate radially localized maxima in the radial electric-field shear in L mode which coincides with the radial location of the pedestal in H mode. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.125003
DOI:
10.1103/PhysRevLett.93.125003
PACS:
52.25.Fi, 52.25.Gj, 52.55.–s
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