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Beta scaling of transport in microturbulence simulations

Phys. Plasmas 12, 072307 (2005); doi:10.1063/1.1954123

Published 29 June 2005

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J. Candy
General Atomics, San Diego, California 92121
A systematic study of the beta (beta) scaling and spatial structure of thermal and particle transport in gyrokinetic turbulence simulations is presented. Here, beta is the ratio of the plasma kinetic pressure to the magnetic pressure. Results show that the nonlinear self-consistent temperature profiles exhibit a (statistically) time-stationary flattening in the vicinity of rational surfaces with a concomitant drop in the electrostatic components of the thermal diffusivity. Simultaneously, the increased magnetic fluctuation amplitude at these surfaces enhances the steady-state electromagnetic (flutter) component of the electron thermal diffusivity. The electromagnetic components of the ion transport coefficients remain close to zero, as expected on theoretical grounds. Only a weak dependence of ion energy transport on beta is observed, consistent with recent tokamak experiments [C. C. Petty et al., Phys. Plasmas 11, 2514 (2004)]. ©2005 American Institute of Physics
History: Received 25 March 2005; accepted 26 May 2005; published 29 June 2005
Permalink: http://link.aip.org/link/?PHPAEN/12/072307/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.25.Fi
    Plasma transport properties
  • 52.35.Ra
    Plasma turbulence
  • 52.65.Tt
    Gyrofluid and gyrokinetic plasma simulations
  • 52.35.Mw
    Nonlinear phenomena: plasma waves, wave propagation and other interactions including parametric effects, mode coupling, ponderomotive effects, etc
  • 52.25.Gj
    Plasma fluctuation and chaos phenomena
  • YEAR: 2005

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (19)
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