Gyrokinetic simulation of entropy cascade in two-dimensional electrostatic turbulence

Details Gyrokinetic simulation of entropy cascade in two-dimensional electrostatic turbulence Gyrokinetic simulation of entropy cascade in two-dimensional electrostatic turbulence

2010-03-20

arxiv.org/abs/1003.3933v2

J. Plasma Fusion Res. SERIES 9, 509 (2010)

Physics

Plasma Physics

8 pages, 10 figures, Conference paper presented at 2009 Asia-Pacific Plasma Theory Conference. Ver.2 includes corrected typos

Scientific paper

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.

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