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.
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
Yong
Y
Xiao
Zhihong
Z
Lin