Constraints on theories provided by fast time response E(r) measurements across the L to H transition on DII-D

Results of experiments performed on DIII-D since the last H-mode workshop impose a number of constraints on theories. First, measurements demonstrate that both the main ion pressure gradient, del P-i, and poloidal rotation, v(theta i), are important in determining E(r) in the H-mode, with the v x B term being the trigger for the transition. Accordingly, theories must include both del P-i and v x B effects. Since the v x B term appears to be the trigger, the physics of the power threshold must involve the physics of the perpendicular rotation. Second, the time sequence of changes in E(r) and the density and potential fluctuations are consistent with E x B shear causing the change in the fluctuations. Third, the sharp onset of the fluctuation suppression during this same time sequence strongly suggests a critical E(r) shear for fluctuation suppression. Fourth, Langmuir probe measurements show the need for a turbulence stabilization theory including multiple fluctuating fields and their relative phases. Finally, theories based on v(theta i) predicted by standard neoclassical theory disagree with experiment.