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Statistical analysis of fluctuations and noise-driven transport in particle-in-cell simulations of plasma turbulence

2007; American Institute of Physics; Volume: 14; Issue: 3 Linguagem: Inglês

10.1063/1.2673002

1527-2419

I. Holod, Zhihong Lin,

Laser-Plasma Interactions and Diagnostics

The problem of discrete particle noise has been studied based on direct fluctuation measurements from gyrokinetic particle-in-cell simulations of stable plasmas. From the statistical analysis of electrostatic potential time evolution, the space-time correlation function has been measured. Fluctuation spectra have been constructed and analyzed in detail. Noise-driven transport is calculated using the quasilinear expression for the diffusion coefficient and the obtained noise spectrum. The theoretical value of electron heat conductivity shows good agreement with that measured in the simulation. It has been shown that for the realistic parameters in actual turbulence simulations, the noise-driven transport depends linearly on the entropy of the system. This study makes it possible to estimate and subtract the noise contribution to the total transport during turbulence simulations.