Observation of Velocity-Independent Electron Transport in the Reversed Field Pinch

R. O’Connell, D. J.Den Hartog, C. B. Forest, J. K. Anderson, T. M. Biewer, B. E. Chapman, D. Craig, G. Fiksel, S. C. Prager, J. S. Sarff, S. D. Terry, R. W. Harvey

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33 Scopus citations

Abstract

Confinement of runaway electrons has been observed for the first time in a reversed field pinch during improved-confinement plasmas in the Madison Symmetric Torus. Energy-resolved hard-x-ray flux measurements have been used to determine the velocity dependence of the electron diffusion coefficient, utilizing computational solutions of the Fokker-Planck transport equation. With improved-confinement, the fast electron diffusivity drops by 2 orders of magnitude and is independent of velocity. This suggests a change in the transport mechanism away from stochastic magnetic field diffusion.

Original languageEnglish (US)
JournalPhysical review letters
Volume91
Issue number4
DOIs
StatePublished - Jul 24 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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