L-H Transition and Power Threshold Studies in the DIII-D Tokamak

摘要: DIII-D contributions to H-mode transition physics and power thresholds are reviewed. Two general approaches were pursued: (a) establishing scaling relations based on empirical observations (b) acquiring a theoretical understanding of the transition. The interaction experiment results development theories over early 1990s led highly successful widely accepted model shear suppression turbulence by crossed electric magnetic fields (E x B) as cause improved confinement in H-mode. Experimental studies have also examined parameters at edge plasma order identify control parameter for test various effect direction [nabla]B drift threshold is used tool further understand L-H Results other tokamaks guided researchers study turbulent generated flows possible trigger Access controlled threshold, it important predict next-generation tokamaks. In addition electron density toroidal field dependencies, found that many affect powermore » threshold. Studies size, configuration, neutral effects been performed. data an international tokamak database help establish future devices.« less