Open AccessCore Poloidal Rotation and Internal Trnasport Barrier Formation in TFTR
Author(s) -
E J Synakowski,
F M Levinton,
M C Zarnstorff,
R E Bell,
S H Batha
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/3750
Subject(s) - rotation (mathematics) , plasma , atomic physics , physics , core (optical fiber) , shear (geology) , tokamak , impurity , electric field , nuclear physics , materials science , optics , geometry , quantum mechanics , mathematics , composite material
Impurity poloidal rotation velocities have been measured in the core of TFTR plasmas using a new spectroscopic diagnostic. Two types of transitions to enhanced confinement in reversed shear plasmas are examined. A bifurcation in carbon poloidal rotation is observed to occur before the transition to enhanced confinement for one of these types, while other measured plasmas parameters remain constant. A narrow radial region with reversed poloidal rotation and rotational shear is established 60-100 ms before the transition, and is associated with a large negative radial electric field