Magnetohydrodynamic effects of current profile control in reversed field pinches

C. R. Sovinec, S. C. Prager

Research output: Contribution to journalArticle

31 Scopus citations

Abstract

Linear and non-linear MHD computations are used to investigate reversed field pinch configurations with magnetic fluctuations reduced through current profile control. Simulations with reduced ohmic drive and moderate auxiliary current drive, represented generically with an electron force term, applied locally in radius near the plasma edge show magnetic fluctuation energies that are orders of magnitude smaller than those in simulations without profile control. The core of the improved configurations has reduced magnetic shear and closed flux surfaces in some cases, and reversal is sustained through the auxiliary current drive. Modes resonant near the edge may become unstable with auxiliary drive, but their saturation levels can be controlled. The space of auxiliary drive parameters is explored, and the in effects of deviating far from optimal conditions is demonstrated in non-linear simulations.

Original languageEnglish (US)
Pages (from-to)777-790
Number of pages14
JournalNuclear Fusion
Volume39
Issue number6
DOIs
StatePublished - Jun 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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