Observation of Non-Classical Radial Current Diffusion in a Fully Bootstrap Current Driven Tokamak
Author: Y. S. Hwang, C B. Forest, and M. Ono
Reconstruction and modeling of the plasma current profiles in a fully pressure-driven tokamak have been performed in the Current Drive Experiment-Upgrade(CDX-U). The reconstructed experimental current profile has a significant deviation from that of the calculated neoclassical currents. Satisfactory agreement between the measured and calculated model profiles was obtained by including a helicity conserving current diffusion term in the modeling which created the required self-generated "seed" current.