Gyrokinetic simulation of entropy cascade in two-dimensional electrostatic turbulence
Abstract
Two-dimensional electrostatic turbulence in magnetized weakly-collisional plasmas exhibits a cascade of entropy in phase space [Phys. Rev. Lett. 103, 015003 (2009)]. At scales smaller than the gyroradius, this cascade is characterized by the dimensionless ratio D of the collision time to the eddy turnover time measured at the scale of the thermal Larmor radius. When D >> 1, a broad spectrum of fluctuations at sub-Larmor scales is found in both position and velocity space. The distribution function develops structure as a function of v_{perp}, the velocity coordinate perpendicular to the local magnetic field. The cascade shows a local-scale nonlinear interaction in both position and velocity spaces, and Kolmogorov's scaling theory can be extended into phase space.
Keywords
Cite
@article{arxiv.1003.3933,
title = {Gyrokinetic simulation of entropy cascade in two-dimensional electrostatic turbulence},
author = {T. Tatsuno and M. Barnes and S. C. Cowley and W. Dorland and G. G. Howes and R. Numata and G. G. Plunk and A. A. Schekochihin},
journal= {arXiv preprint arXiv:1003.3933},
year = {2010}
}
Comments
8 pages, 10 figures, Conference paper presented at 2009 Asia-Pacific Plasma Theory Conference. Ver.2 includes corrected typos & updated references