Abstract
Measurements of the radial electric field have been obtained on the Tokamak Fusion Test Reactor utilizing the motional Stark effect diagnostic. A large negative excursion in the radial electric field occurs before the transition to the enhanced reversed magnetic shear mode. The electric field is localized to a narrow spatial region and is not observed in discharges without the transition to improved confinement. Concomitant with the radial electric field excursion is a change in the measured impurity poloidal rotation velocity and bursts of magnetic fluctuations.
Original language | English |
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Pages (from-to) | 4887-4890 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 80 |
Issue number | 22 |
DOIs | |
State | Published - 1998 |