Numerical simulation and analysis of plasma turbulence the Large Plasma Device

M. V. Umansky; P. Popovich; T. A. Carter; B. Friedman; W. M. Nevins

doi:10.1063/1.3567033

Numerical simulation and analysis of plasma turbulence the Large Plasma Device

M. V. Umansky, P. Popovich, T. A. Carter, B. Friedman, W. M. Nevins

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20 Scopus citations

Abstract

Turbulence calculations with a 3D collisional fluid plasma model demonstrate qualitative and semi-quantitative similarity to experimental data in the Large Plasma Device W. Gekelman, Rev. Sci. Inst. 62, 2875 (1991), in particular for the temporal spectra, fluctuations amplitude, spatial correlation length, and radial particle flux. Several experimentally observed features of plasma turbulence are qualitatively reproduced, and quantitative agreement is achieved at the order-of-magnitude level. The calculated turbulence fluctuations have non-Gaussian characteristics, however the radial flux of plasma density is consistent with Bohm diffusion. Electric polarization of density blobs does not appear to play a significant role in the studied case. Turbulence spectra exhibit direct and inverse cascades in both azimuthal and axial wavenumbers and indicate coupling between the drift instability and Kelvin-Helmholtz mode.

Original language	English
Article number	055709
Journal	Physics of Plasmas
Volume	18
Issue number	5
DOIs	https://doi.org/10.1063/1.3567033
State	Published - May 2011
Externally published	Yes

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AU - Popovich, P.

AU - Carter, T. A.

AU - Friedman, B.

AU - Nevins, W. M.

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AB - Turbulence calculations with a 3D collisional fluid plasma model demonstrate qualitative and semi-quantitative similarity to experimental data in the Large Plasma Device W. Gekelman, Rev. Sci. Inst. 62, 2875 (1991), in particular for the temporal spectra, fluctuations amplitude, spatial correlation length, and radial particle flux. Several experimentally observed features of plasma turbulence are qualitatively reproduced, and quantitative agreement is achieved at the order-of-magnitude level. The calculated turbulence fluctuations have non-Gaussian characteristics, however the radial flux of plasma density is consistent with Bohm diffusion. Electric polarization of density blobs does not appear to play a significant role in the studied case. Turbulence spectra exhibit direct and inverse cascades in both azimuthal and axial wavenumbers and indicate coupling between the drift instability and Kelvin-Helmholtz mode.

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Numerical simulation and analysis of plasma turbulence the Large Plasma Device

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