Published March 1992 | Version v1
Report Restricted

Measurement of nonlinear mode coupling of tearing fluctuations

Creators

Description

Three-wave nonlinear coupling of spatial Fourier modes is measured in the MST reversed field pinch by applying bi-spectral 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 bi-spectra predicted by MHD computation indicates reasonably good agreement. However, during the crash phase of the sawtooth oscillation the nonlinear coupling is strongly enhanced, concomittant with a broadened (presumably nonlinearly generated) k-spectrum

Availability note (English)

MF available from INIS under the Report Number; OSTI as DE92013901; NTIS; INIS; US Govt. Printing Office Dep.

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Additional details

Publishing Information

Imprint Pagination
14 p.
Report number
DOE/ER/53198--190

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
23069261
Subject category
S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
Descriptors DEI
FLUCTUATIONS; MHD EQUILIBRIUM; NONLINEAR PROBLEMS; OSCILLATION MODES; REVERSE-FIELD PINCH; SAWTOOTH OSCILLATIONS; TEARING INSTABILITY
Descriptors DEC
EQUILIBRIUM; INSTABILITY; OSCILLATIONS; PINCH EFFECT; PLASMA INSTABILITY; PLASMA MACROINSTABILITIES; VARIATIONS

Optional Information

Contract/Grant/Project number
Contract FG02-85ER53198
Funding organization
USDOE, Washington, DC (United States).