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Title: Beta scaling of transport in microturbulence simulations

Abstract

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)].

Authors:
 [1]
  1. General Atomics, San Diego, California 92121 (United States)
Publication Date:
OSTI Identifier:
20764383
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 12; Journal Issue: 7; Other Information: DOI: 10.1063/1.1954123; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; CHARGED-PARTICLE TRANSPORT; ELECTRON TEMPERATURE; ELECTRONS; FLUCTUATIONS; ION TEMPERATURE; IONS; MODE RATIONAL SURFACES; NONLINEAR PROBLEMS; PLASMA; PLASMA PRESSURE; PLASMA SIMULATION; SCALING LAWS; STEADY-STATE CONDITIONS; SURFACES; THERMAL DIFFUSIVITY; TOKAMAK DEVICES; TURBULENCE

Citation Formats

Candy, J. Beta scaling of transport in microturbulence simulations. United States: N. p., 2005. Web. doi:10.1063/1.1954123.
Candy, J. Beta scaling of transport in microturbulence simulations. United States. https://doi.org/10.1063/1.1954123
Candy, J. 2005. "Beta scaling of transport in microturbulence simulations". United States. https://doi.org/10.1063/1.1954123.
@article{osti_20764383,
title = {Beta scaling of transport in microturbulence simulations},
author = {Candy, J},
abstractNote = {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)].},
doi = {10.1063/1.1954123},
url = {https://www.osti.gov/biblio/20764383}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 7,
volume = 12,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2005},
month = {Fri Jul 15 00:00:00 EDT 2005}
}