Dependence of the threshold for perturbation field generated m/n=2/1 tearing modes on the plasma fluid rotation

TitleDependence of the threshold for perturbation field generated m/n=2/1 tearing modes on the plasma fluid rotation
Publication TypeJournal Article
Year of Publication2006
AuthorsH.R Koslowski, Y. Liang, A. Kramer-Flecken, K. Lobwenbruck, M. von Hellermann, E. Westerhof, RC Wolf, O. Zimmermann
JournalNuclear Fusion
Volume46
Number8
PaginationL1-L5
Date PublishedAug
Type of ArticleLetter
ISBN Number0029-5515
Accession NumberISI:000240306700014
KeywordsDIII-D, ERROR-FIELD, JET, TEXTOR, TOKAMAK
Abstract

The dynamic ergodic divertor (DED) on the TEXTOR tokamak allows for the creation of static and rotating helical magnetic perturbation fields. In the 3/1 configuration the strong m/n = 2/1 sideband excites a locked 2/1 tearing mode above a critical perturbation field strength. The mode onset threshold depends strongly on the plasma fluid rotation with respect to the mode. Rotation in plasma current direction destabilizes the mode in a certain range of rotation frequencies, whereas counter-rotation has a stabilizing influence. The threshold shows a minimum when the frequency of the external perturbation equals the MHD frequency of the mode.

URL<Go to ISI>://000240306700014
Division

Fusion Physics

Department

Instrumentation development

PID

add863dbdc060b066b1c39dce9201053

Alternate TitleNucl. Fusion

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