Field, A R; Michael, Clive; Akers, R.J.; Candy, J; Colyer, G; Guttenfelder, W.; Ghim, Y.-c.; Roach, C M; Saarelma, S.; MAST Team, The
The formation of internal transport barriers (ITBs) is investigated in MAST spherical tokamak plasmas. The relative importance of equilibrium flow shear and magnetic shear in their formation and evolution is investigated using data from high-resolution kinetic- and q-profile diagnostics. In L-mode plasmas, with co-current directed NBI heating, ITBs in the momentum and ion thermal channels form in the negative shear region just inside qmin. In the ITB region the anomalous ion thermal transport...[Show more]
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