Observation of velocity-independent electron transport in the reversed field pinch |
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| Authors: | O'Connell R Den Hartog D J Forest C B Anderson J K Biewer T M Chapman B E Craig D Fiksel G Prager S C Sarff J S Terry S D Harvey R W |
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| Affiliation: | Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. roconnell@wisc.edu |
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| 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. |
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