TY - JOUR
T1 - Impact of stochastic magnetic fields on plasma rotation and radial electric fields in the plasma edge of the tokamak TEXTOR
JF - Journal of Nuclear Materials
Y1 - 2007
A1 - Unterberg, B.
A1 - Busch, C.
A1 - De Bock, M.
A1 - Coenen, J. W.
A1 - Finken, K.H.
A1 - Jachmich, S.
A1 - Jakubowski, M. W.
A1 - Kikuchi, Y.
A1 - Kramer-Flecken, A.
A1 - Lehnen, M.
A1 - Samm, U.
A1 - Schmitz, O.
A1 - Soldatov, S.
A1 - Tokar, M. Z.
A1 - von Hellermann, M.
A1 - R C Wolf
A1 - Xu, Y.
KW - electric field
KW - plasma flow
KW - stochastic boundary
KW - TEXTOR
AB - 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.
VL - 363
SN - 0022-3115
UR - ://000247657200122
N1 - ISI Document Delivery No.: 184QQ
U1 - Fusion Physics
U2 - Instrumentation development
U5 - 279110ab4377e4b6056177db88f615ca
ER -