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Mean and oscillating plasma flows and turbulence interactions across the L-H confinement transition
Authors:Conway G D,Angioni C,Ryter F,Sauter P,Vicente J  ASDEX Upgrade Team
Affiliation:EURATOM-Association IPP, Max-Plank-Institut für Plasmaphysik, D-85748, Garching, Germany.
Abstract:A complex interaction between turbulence driven E × B zonal flow oscillations, i.e., geodesic acoustic modes (GAMs), the turbulence, and mean equilibrium flows is observed during the low to high (L-H) plasma confinement mode transition in the ASDEX Upgrade tokamak. Below the L-H threshold at low densities a limit-cycle oscillation forms with competition between the turbulence level and the GAM flow shearing. At higher densities the cycle is diminished, while in the H mode the cycle duration becomes too short to sustain the GAM, which is replaced by large amplitude broadband flow perturbations. Initially GAM amplitude increases as the H-mode transition is approached, but is then suppressed in the H mode by enhanced mean flow shear.
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