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

B. E. Chapman, T. M. Biewer, P. K. Chattopadhyay, C. S. Chiang, D. J. Craig, N. A. Crocker, D. J. Den Hartog, G. Fiksel, P. W. Fontana, S. C. Prager, J. S. Sarff

Research output: Contribution to journalLetter

20 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3491-3494
Number of pages4
JournalPhysics of Plasmas
Volume7
Issue number9
DOIs
StatePublished - Sep 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Keywords

  • CHARGED-PARTICLE TRANSPORT
  • CURRENT-DRIVE HEATING
  • MAGNETOHYDRODYNAMICS
  • PLASMA CONFINEMENT
  • REVERSE-FIELD PINCH
  • REVERSED-FIELD PINCH DEVICES

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    Chapman, B. E., Biewer, T. M., Chattopadhyay, P. K., Chiang, C. S., Craig, D. J., Crocker, N. A., Den Hartog, D. J., Fiksel, G., Fontana, P. W., Prager, S. C., & Sarff, J. S. (2000). Modifications to the edge current profile with auxiliary edge current drive and improved confinement in a reversed-field pinch. Physics of Plasmas, 7(9), 3491-3494. https://doi.org/10.1063/1.1287913