An investigation of density fluctuations and electron transport in the Madison Symmetric Torus reversed-field pinch

N. E. Lanier, D. Craig, J. K. Anderson, T. M. Biewer, B. E. Chapman, D. J. Den Hartog, C. B. Forest, S. C. Prager, D. L. Brower, Y. Jiang

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27 Scopus citations

Abstract

The origin of large scale density fluctuations and their role in electron transport has been investigated in the Madison Symmetric Torus reversed-field pinch [R. N. Dexter et al., Fusion Tech. 19, 131 (1991)]. At medium frequencies (10-30 kHz), ñ is associated with core-resonant magnetic fluctuations having poloidal mode number m=1 and toroidal mode numbers n=6-10. These chord-averaged density fluctuations are shown to be coherent with large scale radial flow fluctuations, permitting fluctuation-induced particle flux of the form 〈ñṽr〉 to be studied. In the edge, although amplitudes are large, ñ and ṽr are out of phase, consistent with advection of the mean density gradient by perturbed magnetic field lines and no electron transport. During improved confinement discharges, produced by inductive current drive, both fluctuation amplitudes and the total radial electron flux are greatly reduced over the entire plasma cross section.

Original languageEnglish (US)
Pages (from-to)3402-3410
Number of pages9
JournalPhysics of Plasmas
Volume8
Issue number7
DOIs
StatePublished - Jul 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Lanier, N. E., Craig, D., Anderson, J. K., Biewer, T. M., Chapman, B. E., Den Hartog, D. J., Forest, C. B., Prager, S. C., Brower, D. L., & Jiang, Y. (2001). An investigation of density fluctuations and electron transport in the Madison Symmetric Torus reversed-field pinch. Physics of Plasmas, 8(7), 3402-3410. https://doi.org/10.1063/1.1378328