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Author McMillan, B. F. ♦ Lapillonne, X. ♦ Brunner, S. ♦ Villard, L. ♦ Jolliet, S. ♦ Bottino, A. ♦ Goerler, T. ♦ Jenko, F.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ APPROXIMATIONS ♦ COMPUTERIZED SIMULATION ♦ HEAT TRANSFER ♦ MAGNETIC CONFINEMENT ♦ PLASMA ♦ PLASMA SIMULATION ♦ SCALING LAWS ♦ THERMAL DIFFUSIVITY ♦ TURBULENCE ♦ CALCULATION METHODS ♦ CONFINEMENT ♦ ENERGY TRANSFER ♦ PHYSICAL PROPERTIES ♦ PLASMA CONFINEMENT ♦ SIMULATION ♦ THERMODYNAMIC PROPERTIES
Abstract The scaling of turbulence-driven heat transport with system size in magnetically confined plasmas is reexamined using first-principles based numerical simulations. Two very different numerical methods are applied to this problem, in order to resolve a long-standing quantitative disagreement, which may have arisen due to inconsistencies in the geometrical approximation. System size effects are further explored by modifying the width of the strong gradient region at fixed system size. The finite width of the strong gradient region in gyroradius units, rather than the finite overall system size, is found to induce the diffusivity reduction seen in global gyrokinetic simulations.
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-10-08
Publisher Place United States
Journal Physical Review Letters
Volume Number 105
Issue Number 15


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