Local and nonlocal parallel heat transport in general magnetic fields

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.106.195004· OSTI ID:1032026

Del-Castillo-Negrete, Diego B ^[1]; Chacon, Luis ^[1]

---

1. ORNL

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1032026
• Journal Information: Physical Review Letters, Vol. 106, Issue 19; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CLOSURES
DIFFUSION
FRACTALS
MAGNETIC FIELDS
POLLUTION
TRANSPORT
ANISOTROPIC DIFFUSION
LINES