Nonlinear low noise particle-in-cell simulations of electron temperature gradient driven turbulence

Bottino, A.; Peeters, A. G.; Hatzky, R.; Jolliet, S.; McMillan, B. F.; Tran, T. M.; Villard, L.
January 2007
Physics of Plasmas;Jan2007, Vol. 14 Issue 1, p010701
Academic Journal
In this Letter, it is shown that global, nonlinear, particle-in-cell (PIC) simulations of electron temperature driven turbulence recover the same level of transport as flux-tube codes when the level of statistical noise, associated with the PIC discretization, is sufficiently small. An efficient measure of the signal-to-noise ratio, applicable to every PIC code, is introduced. This diagnostic provides a direct measure of the quality of PIC simulations and allows for the validation of analytical estimates of the numerical noise. Global simulations for values of ρe*<1/450 (normalized electron gyroradius) show no evidence of a gyro-Bohm scaling.


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