Experimental investigations on the role of flow shear in improved confinement
- 1 June 1998
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 40 (6) , 1105-1113
- https://doi.org/10.1088/0741-3335/40/6/016
Abstract
Edge transport and confinement changes induced by radial electric fields, externally imposed in TEXTOR-94 by means of electrode biasing, were investigated. The edge profiles of the electric field were measured continuously by a specially developed nine-tip Langmuir probe, thus allowing the study of the relative spatial and temporal dynamics of and its radial gradient and possible ensuing transport changes. A particle transport barrier is found to be built up as the electric field gradient increases, thus strengthening the conjecture that stabilization is a viable mechanism for improved confinement in tokamaks.Keywords
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