We discuss the effect of shearing on transport and the formation of transport barriers. The focus is primarily on laboratory plasmas where the formation of transport barrier (the L-H transition or the formation of internal transport barrier) is thought to originate from turbulence regulation by shearing by (coherent) mean E × B flows and (random) zonal flows. We provide quantitative discussion on the reduction of turbulent transport by these flows and elucidate their roles in the barrier formation.
ASJC Scopus subject areas
- Physics and Astronomy(all)