POLOIDAL ROTATION AND RADIAL ELECTRIC FIELDS IN TFTR

摘要

New measurements of the impurity ion poloidal rotation profile have been made in the Tokamak FusionrnTest Reactor (TFTR), allowing the determination of radial electric field profiles. A bifurcation of the impurityrnpoloidal velocity is observed in reversed shear discharges before the transition to enhanced confinement.rnSignificant differences between measured and neoclassically calculated values of poloidal velocity and radialrnelectric field have been observed. Velocity measurements in a number of confinement regimes (supershot,rnreversed shear, and L-mode) suggest that the impurity poloidal velocity profile is correlated with the ionrntemperature profile.