Nonlinear δf particle in cell gyrokinetic simulations of the microtearing mode

Chowdhury, J.; Chen, Yang; Parker, Scott E.

doi:10.1063/1.5141353

Nonlinear δf particle in cell gyrokinetic simulations of the microtearing mode

Journal Article · Tue Apr 21 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5141353· OSTI ID:1800591

Chowdhury, J. ^[1]; Chen, Yang ^[2]; Parker, Scott E. ^[2]

Univ. of Warwick, Coventry (United Kingdom); University of Warwick
Univ. of Colorado, Boulder, CO (United States)

Nonlinear simulations are carried out for the microtearing mode using particle-based δf gyrokinetic simulations for parameters relevant to spherical tokamaks. The present study finds that the microtearing mode can generate significant electron heat flux, which is predominantly carried out by the electromagnetic component of the heat flux with a negligible contribution from the electrostatic component. The mode sustains without the electrostatic component. We observe that the electron heat flux increases with the electron temperature gradient. The heat flux exhibits a very weak dependence on the collisions. It increases with electron β initially; however, at very high β, the electron heat flux is reduced.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Colorado, Boulder, CO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-08ER54954

OSTI ID:: 1800591

Alternate ID(s):: OSTI ID: 1615540

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 27; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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