Coherent nonlinear coupling between a long-wavelength mode and small-scale turbulence in the TEXT tokamak

Journal Article · Mon Apr 26 04:00:00 EDT 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.70.2565· OSTI ID:6768466

Tsui, H Y.W.; Rypdal, K; Ritz, C P; Wootton, A J ^[1]

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1. Fusion Research Center, The University of Texas at Austin, Austin, Texas 78712 (United States)

Bispectral analysis of Langmuir probe data indicates that coherent nonlinear coupling, in addition to the noncoherent turbulent interactions, exists in the edge plasma of the tokamak TEXT. Not all the modes involved reside within the spectral region of the usual broadband turbulence. At a major resonant surface the small-scale turbulent activity interacts [ital coherently] with a localized long-wavelength mode; a signature of regular or coherent structure. By the observed coupling to the transport related turbulence, the long-wavelength mode can influence plasma confinement indirectly. These observations signify the influence of low-order resonant surfaces on the edge turbulence in tokamaks.

• DOE Contract Number: FG05-88ER53267
• OSTI ID: 6768466
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 70:17; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700320 -- Plasma Diagnostic Techniques & Instrumentation-- (1992-)
700330* -- Plasma Kinetics
Transport
& Impurities-- (1992-)
700340 -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
CLOSED PLASMA DEVICES
COHERENT RADIATION
COUPLING
DATA
ELECTRIC PROBES
ELECTROMAGNETIC RADIATION
END EFFECTS
EXPERIMENTAL DATA
FLUCTUATIONS
INFORMATION
LANGMUIR PROBE
NONLINEAR PROBLEMS
NUMERICAL DATA
OSCILLATION MODES
PLASMA
PROBES
RADIATIONS
RESONANCE
TEXT DEVICES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TURBULENCE
VARIATIONS