Validation of Neoclassical Bootstrap Current Models in the Edge of an H-Mode Plasma

摘要

Analysis of the parallel electric field E_‖ evolution following an L-H transition in the DIII-D tokamak indicates the generation of a large negative pulse near the edge which propagates inward, indicative of the generation of a noninductive edge current. Modeling indicates that the observed E_‖ evolution is consistent with a narrow current density peak generated in the plasma edge. Very good quantitative agreement is found between the measured E_‖ evolution and that expected from neoclassical theory predictions of the bootstrap current.