Reflectometry measurements during operation of the dynamic ergodic divertor at TEXTOR

TitleReflectometry measurements during operation of the dynamic ergodic divertor at TEXTOR
Publication TypeJournal Article
Year of Publication2006
AuthorsA. Kramer-Flecken, S. Soldatov, C. Busch, Y. Liang, M. von Hellermann, R. Wolf, O. Zimmermann
JournalNuclear Fusion
Volume46
Number9
PaginationS730-S742
Date PublishedSep
Type of ArticleArticle
ISBN Number0029-5515
Accession NumberISI:000240869100010
KeywordsCONFINEMENT, CORE TURBULENCE, DIII-D, INTERNAL TRANSPORT BARRIERS, PROGRESS, ROTATION, SUPPRESSION, TOKAMAK PLASMAS, TORE-SUPRA, TURBULENCE CHARACTERISTICS
Abstract

The O-mode correlation reflectometer at TEXTOR is used for the investigation of the propagation and the properties of the turbulence at the plasma edge. The multi-horn antenna set-up allows the investigation of the correlation properties of the turbulence and its rotation. Turbulence and plasma rotation for different plasma conditions are found to be in agreement and based on this comparison the radial electric field is estimated. In addition the density fluctuation level is estimated from the standard deviation of the phase of the reflected signal. The influence of a magnetic perturbation field, generated by the dynamic ergodic divertor (DED), on the turbulence and transport properties is studied and compared with plasmas without such a field perturbation. The strength and radial range of the perturbation field can be widely varied. Together with tangential neutral beam injection in co- and counter-current directions, the turbulent transport is investigated. The combination of neutral beam injection and the DED enables the modification of the plasma rotation profile. It can lead either to the generation of a locked mode or the formation of a transport barrier.

URL<Go to ISI>://000240869100010
Division

Fusion Physics

Department

Instrumentation development

PID

9baa681ddf8f87181ff6e3902a71d666

Alternate TitleNucl. Fusion

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