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Abstract

Experimental results on the role of zonal flows and geodesic acoustic modes in formation of transport barriers in the H-1 heliac are reviewed.

PACS  52.25.Fi - 52.35.Ra

Key words  zonal flow - transport barrier - H mode - pedestal

Presented at the Workshop “Electric Fields, Structures and Relaxation in Edge Plasmas”, Roma, Italy, June 26–27, 2006.

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