Measurement of nonlinear mode coupling of tearing fluctuations

Journal Article · Mon Jul 13 00:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.281· OSTI ID:7285211

Assadi, S; Prager, S C; Sidikman, K L ^[1]

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1. Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States)

Three-wave nonlinear coupling of spatial Fourier modes is measured in the MST reversed field pinch by applying bispectral analysis to magnetic fluctuations measured at the plasma edge at 64 toroidal locations and 16 poloidal locations, permitting observation of coupling over 8 polodial modes and 32 toroidal modes. Comparison to bispectra predicted by resistive MHD computation indicates reasonably good agreement. However, during the crash phase of the sawtooth oscillation the nonlinear coupling is strongly enhanced, concomitant with a broadened (presumably nonlinearly generated) {ital k} spectrum.

• OSTI ID: 7285211
• Journal Information: Physical Review Letters; (United States), Vol. 69:2; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
PLASMA
NONLINEAR PROBLEMS
REVERSE-FIELD PINCH
PLASMA DIAGNOSTICS
COUPLING
END EFFECTS
EXPERIMENTAL DATA
FLUCTUATIONS
FOURIER ANALYSIS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
OSCILLATION MODES
SAWTOOTH OSCILLATIONS
TEARING INSTABILITY
THEORETICAL DATA
TOROIDAL CONFIGURATION
ANNULAR SPACE
CLOSED CONFIGURATIONS
CONFIGURATION
DATA
FLUID MECHANICS
HYDRODYNAMICS
INFORMATION
INSTABILITY
MAGNETIC FIELD CONFIGURATIONS
MECHANICS
NUMERICAL DATA
OSCILLATIONS
PINCH EFFECT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
SPACE
VARIATIONS
700340* - Plasma Waves
Oscillations
& Instabilities- (1992-)
700330 - Plasma Kinetics
Transport
& Impurities- (1992-)