Wave-Number Spectrum of Drift-Wave Turbulence

Journal Article · Fri Jun 26 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.102.255002· OSTI ID:21347000

Guercan, Oe D; Hennequin, P ^[1]; Garbet, X; Casati, A; Falchetto, G L ^[2]; Diamond, P H ^[3]

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1. Laboratoire de Physique des Plasmas, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex (France)
2. CEA, IRFM, F-13108 Saint Paul Lez Durance (France)
3. Center for Astrophysics and Space Sciences, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0424 (United States)

A simple model for the evolution of turbulence fluctuation spectra, which includes neighboring interactions leading to the usual dual cascade as well as disparate scale interactions corresponding to refraction by large scale structures, is derived. The model recovers the usual Kraichnan-Kolmogorov picture in the case of exclusively local interactions and midrange drive. On the other hand, when disparate scale interactions are dominant, a simple spectrum for the density fluctuations of the form |n{sub k}|{sup 2}propor tok{sup -3}/(1+k{sup 2}){sup 2} is obtained. This simple prediction is then compared to, and found to be in fair agreement with, Tore Supra CO{sub 2} laser scattering data.

• OSTI ID: 21347000
• Journal Information: Physical Review Letters, Vol. 102, Issue 25; Other Information: DOI: 10.1103/PhysRevLett.102.255002; (c) 2009 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON DIOXIDE LASERS
EVOLUTION
SCATTERING
TORE SUPRA TOKAMAK
TURBULENCE
WAVE PROPAGATION
CLOSED PLASMA DEVICES
GAS LASERS
LASERS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES