Turbulent current drive mechanisms | Zendy

Christopher J. McDevitt | Zendy; Xian-Zhu Tang | Zendy; Zehua Guo | Zendy

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Turbulent current drive mechanisms

Author(s) -

Christopher J. McDevitt,

Xian-Zhu Tang,

Zehua Guo

Publication year - 2017

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.4996222

Subject(s) - physics , microturbulence , turbulence , electron , momentum (technical analysis) , current (fluid) , plasma , quantum electrodynamics , ohm , ohm's law , computational physics , classical mechanics , mechanics , atomic physics , quantum mechanics , finance , economics , thermodynamics

Mechanisms through which plasma microturbulence can drive a mean electron plasma current are derived. The efficiency through which these turbulent contributions can drive deviations from neoclassical predictions of the electron current profile is computed by employing a linearized Coulomb collision operator. It is found that a non-diffusive contribution to the electron momentum flux as well as an anomalous electron-ion momentum exchange term provide the most efficient means through which turbulence can modify the mean electron current for the cases considered. Such turbulent contributions appear as an effective EMF within Ohm's law and hence provide an ideal means for driving deviations from neoclassical predictions.

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