Ion heating during reconnection in the Madison Symmetric Torus reversed field pinch

S. Gangadhara, D. Craig, D. A. Ennis, D. J. Den Hartog, G. Fiksel, Stewart C. Prager

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Measurements of localized ion heating during magnetic reconnection in the Madison Symmetric Torus reversed field pinch [R. N. Dexter, D. W. Kerst, T. W. Lovell, S. C. Prager, and J. C. Sprott, Fusion Technol. 19, 131 (1991)] are presented using two beam-based diagnostics: Charge exchange recombination spectroscopy and Rutherford scattering. Data have been collected from three types of impulsive reconnection event, in which the resistive tearing mode activity associated with reconnection is present either in the edge plasma, the core plasma, or throughout the plasma volume. A drop in the stored magnetic energy is required for ion heating to be observed during magnetic reconnection, and when this occurs, heating is concentrated in regions where reconnection is taking place. The magnitude of the observed temperature rise during reconnection varies with ion species, suggesting that the heating mechanism has a mass and/or charge dependence. Both the magnitude and spatial structure of the observed temperature rise also depend on the plasma current and density. Nonetheless, the fraction of released magnetic energy converted to ion thermal energy remains roughly constant over a range of plasma conditions.

Original languageEnglish (US)
Article number056121
JournalPhysics of Plasmas
Volume15
Issue number5
DOIs
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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