Impact of stochastic magnetic fields on plasma rotation and radial electric fields in the plasma edge of the tokamak TEXTOR

TitleImpact of stochastic magnetic fields on plasma rotation and radial electric fields in the plasma edge of the tokamak TEXTOR
Publication TypeJournal Article
Year of Publication2007
AuthorsB. Unterberg, C. Busch, M. De Bock, J.W Coenen, K.H. Finken, S. Jachmich, M.W Jakubowski, Y. Kikuchi, A. Kramer-Flecken, M. Lehnen, U. Samm, O. Schmitz, S. Soldatov, M.Z Tokar, M. von Hellermann, RC Wolf, Y. Xu
JournalJournal of Nuclear Materials
Volume363
Pagination698-702
Date PublishedJun
Type of ArticleArticle
ISBN Number0022-3115
Accession NumberISI:000247657200122
Keywordselectric field, plasma flow, stochastic boundary, TEXTOR
Abstract

In this contribution we report on spectroscopic measurements of plasma rotation and the radial electric field in the plasma boundary under the operation of the dynamic ergodic divertor in TEXTOR. Under the influence of the stochastic magnetic field we observe an increase of both poloidal and toroidal rotation of carbon nuclei into ion-diamagnetic drift/co-current direction. With static magnetic perturbation the electric field in the ergodic region increases by 10 kV/m and becomes positive. Application of dynamic perturbation leads to a comparable change of the rotation, independent of the direction of the rotation of the DED field and only depending on the degree of ergodization. We introduce a model to explain the experimental findings by the onset of transverse currents in the ergodic region and a subsequent torque onto the plasma. (c) 2007 Published by Elsevier B.V.

URL<Go to ISI>://000247657200122
Division

Fusion Physics

Department

Instrumentation development

PID

279110ab4377e4b6056177db88f615ca

Alternate TitleJ. Nucl. Mater.

Go back one page.