Electromagnetic transport from microtearing mode turbulence

This Letter presents nonlinear gyrokinetic simulations of microtearing mode turbulence. The simulations include collisional and electromagnetic effects and use experimental parameters from a high-β discharge in the National Spherical Torus Experiment. The predicted electron thermal transport is comp...

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Bibliographic Details
Published in:	Physical review letters Vol. 106; no. 15; p. 155004
Main Authors:	Guttenfelder, W, Candy, J, Kaye, S M, Nevins, W M, Wang, E, Bell, R E, Hammett, G W, LeBlanc, B P, Mikkelsen, D R, Yuh, H
Format:	Journal Article
Language:	English
Published:	United States American Physical Society 14-04-2011
Online Access:	Get full text
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Summary:	This Letter presents nonlinear gyrokinetic simulations of microtearing mode turbulence. The simulations include collisional and electromagnetic effects and use experimental parameters from a high-β discharge in the National Spherical Torus Experiment. The predicted electron thermal transport is comparable to that given by experimental analysis, and it is dominated by the electromagnetic contribution of electrons free-streaming along the resulting stochastic magnetic field line trajectories. Experimental values of flow shear can significantly reduce the predicted transport.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 USDOE
ISSN:	0031-9007 1079-7114
DOI:	10.1103/physrevlett.106.155004