Radial electric field measurements in reversed shear plasmas

F. M. Levinton, R. E. Bell, S. H. Batha, E. J. Synakowski, M. C. Zarnstorff

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

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 languageEnglish
Pages (from-to)4887-4890
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number22
DOIs
StatePublished - 1998

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