Modifications to the edge current profile with auxiliary edge current drive and improved confinement in a reversed-field pinch

Journal Article · Fri Sep 01 00:00:00 EDT 2000 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1287913· OSTI ID:20217338

Chapman, B E ^[1]; Biewer, T M ^[1]; Chattopadhyay, P K ^[1]; Chiang, C -S ^[1]; Craig, D J ^[1]; Crocker, N A ^[1]; Den Hartog, D J ^[1]; Fiksel, G ^[1]; Fontana, P W ^[1]; Prager, S C ^[1]

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1. Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)

Auxiliary edge current drive is routinely applied in the Madison Symmetric Torus [R. N. Dexter, D. W. Kerst, T. W. Lovell et al., Fusion Technol. 19, 131 (1991)] with the goal of modifying the parallel current profile to reduce current-driven magnetic fluctuations and the associated particle and energy transport. Provided by an inductive electric field, the current drive successfully reduces fluctuations and transport. First-time measurements of the modified edge current profile reveal that, relative to discharges without auxiliary current drive, the edge current density decreases. This decrease is explicable in terms of newly measured reductions in the dynamo (fluctuation-based) electric field and the electrical conductivity. Induced by the current drive, these two changes to the edge plasma play as much of a role in determining the resultant edge current profile as does the current drive itself. (c) 2000 American Institute of Physics.

• OSTI ID: 20217338
• Journal Information: Physics of Plasmas, Vol. 7, Issue 9; Other Information: PBD: Sep 2000; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA CONFINEMENT
REVERSED-FIELD PINCH DEVICES
REVERSE-FIELD PINCH
CURRENT-DRIVE HEATING
MAGNETOHYDRODYNAMICS
CHARGED-PARTICLE TRANSPORT
EXPERIMENTAL DATA
THEORETICAL DATA