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The problem of generation of zonal flows by small-scale drift-Alfven waves is illuminated more completely. The growth rate of zonal-flow instabilities much greater than known by previous investigation...
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Fluctuations and discrete particle noise in gyrokinetic simulation of drift waves
The relevance of the gyrokinetic fluctuation-dissipation theorem (FDT) to thermal equilibrium and nonequilibrium states of the gyrokinetic plasma is explored, with particular focus being given to the ...

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

Phys. Plasmas 14, 032306 (2007); doi:10.1063/1.2673002

Published 6 March 2007

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I. Holod and Z. Lin
Department of Physics and Astronomy, University of California, Irvine, California 92697
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. ©2007 American Institute of Physics
History: Received 6 November 2006; accepted 20 December 2006; published 6 March 2007
Permalink: http://link.aip.org/link/?PHPAEN/14/032306/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Ra
    Plasma turbulence
  • 52.25.Gj
    Plasma fluctuation and chaos phenomena
  • 52.25.Fi
    Plasma transport properties
  • 52.65.Rr
    Particle-in-cell method (plasma simulation)
  • 52.25.Dg
    Plasma kinetic equations
  • 52.25.Kn
    Thermodynamics of plasmas
  • YEAR: 2007

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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