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

Authors :
P. W. Fontana
C. S. Chiang
J. S. Sarff
Neal Crocker
B. E. Chapman
Darren Craig
T. M. Biewer
Stewart C. Prager
Prabal K. Chattopadhyay
G. Fiksel
D.J. Den Hartog
Source :
Physics of Plasmas. 7:3491-3494
Publication Year :
2000
Publisher :
AIP Publishing, 2000.

Abstract

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.

Details

ISSN :
10897674 and 1070664X
Volume :
7
Database :
OpenAIRE
Journal :
Physics of Plasmas
Accession number :
edsair.doi...........698bf2bcab0bc1210e55a3cec0b49aa0
Full Text :
https://doi.org/10.1063/1.1287913