Local and Nonlocal Parallel Heat Transport in General Magnetic Fields

Journal Article · Fri May 13 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.195004· OSTI ID:21538337

Castillo-Negrete, D del; Chacon, L ^[1]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-8071 (United States)

A novel approach for the study of parallel transport in magnetized plasmas is presented. The method avoids numerical pollution issues of grid-based formulations and applies to integrable and chaotic magnetic fields with local or nonlocal parallel closures. In weakly chaotic fields, the method gives the fractal structure of the devil's staircase radial temperature profile. In fully chaotic fields, the temperature exhibits self-similar spatiotemporal evolution with a stretched-exponential scaling function for local closures and an algebraically decaying one for nonlocal closures. It is shown that, for both closures, the effective radial heat transport is incompatible with the quasilinear diffusion model.

• OSTI ID: 21538337
• Journal Information: Physical Review Letters, Vol. 106, Issue 19; Other Information: DOI: 10.1103/PhysRevLett.106.195004; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHAOS THEORY
DIFFUSION
GRIDS
HEAT TRANSFER
INTEGRAL CALCULUS
MAGNETIC FIELDS
PLASMA
ELECTRODES
ENERGY TRANSFER
MATHEMATICS