Turbulent transport of trapped-electron modes in collisionless plasmas.
Global gyrokinetic particle simulations of collisionless trapped-electron mode turbulence in toroidal plasmas find that electron heat transport exhibits a device size scaling with a gradual transition from Bohm to gyro-Bohm scaling. A comprehensive analysis of spatial and temporal scales shows that the turbulence eddies are predominantly microscopic because of zonal flow shearing, but the presence of mesoscale structures drives a nondiffusive component in the electron heat flux due to the weak nonlinear detuning of the precessional resonance that excites the linear instability.
Xiao
Yong
Y
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Lin
Zhihong
Z