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Author Manz, P. ♦ Birkenmeier, G. ♦ Medvedeva, A. ♦ Fuchert, G. ♦ Cavedon, M. ♦ Conway, G. D. ♦ Maraschek, M. ♦ Mink, F. ♦ Scott, B. D. ♦ Shao, L. M. ♦ Stroth, U.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ASDEX TOKAMAK ♦ ASYMMETRY ♦ BALLOONS ♦ CURRENTS ♦ DISTURBANCES ♦ EQUILIBRIUM ♦ FLUCTUATIONS ♦ GEOMETRY ♦ LIMIT CYCLE ♦ PERTURBATION THEORY ♦ PFIRSCH-SCHLUETER REGIME ♦ PLASMA ♦ RELAXATION ♦ SPIN ♦ TRANSPORT THEORY ♦ TURBULENCE
Abstract Turbulence driven poloidal asymmetric parallel flow and current perturbations are studied for tokamak plasmas of circular geometry. Whereas zonal flows can lead to in-out asymmetry of parallel flows and currents via the Pfirsch–Schlüter mechanism, ballooned transport can result in an up-down asymmetry due to the Stringer spin-up mechanism. Measurements of up-down asymmetric parallel current fluctuations occurring during the I-phase in ASDEX Upgrade are not responses to the equilibrium by the Pfirsch–Schlüter current, but can be interpreted as a response to strongly ballooned plasma transport coupled with the Stringer spin-up mechanism. A good agreement of the experimental measured limit-cycle frequencies during I-phase with the Stringer spin-up relaxation frequency is found.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-05-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 5


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