Measurement of nonlinear mode coupling of tearing fluctuations

S. Assadi; S. C. Prager; K. L. Sidikman

doi:10.1103/PhysRevLett.69.281

Measurement of nonlinear mode coupling of tearing fluctuations

S. Assadi, S. C. Prager, K. L. Sidikman

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

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) k spectrum.

Original language	English (US)
Pages (from-to)	281-284
Number of pages	4
Journal	Physical Review Letters
Volume	69
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.69.281
State	Published - Jan 1 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.69.281

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abstract = "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) k spectrum.",

author = "S. Assadi and Prager, {S. C.} and Sidikman, {K. L.}",

year = "1992",

month = jan,

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doi = "10.1103/PhysRevLett.69.281",

language = "English (US)",

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pages = "281--284",

journal = "Physical Review Letters",

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T1 - Measurement of nonlinear mode coupling of tearing fluctuations

AU - Assadi, S.

AU - Prager, S. C.

AU - Sidikman, K. L.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - 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) k spectrum.

AB - 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) k spectrum.

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DO - 10.1103/PhysRevLett.69.281

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VL - 69

SP - 281

EP - 284

JO - Physical Review Letters

JF - Physical Review Letters

IS - 2

ER -

Measurement of nonlinear mode coupling of tearing fluctuations

Abstract

All Science Journal Classification (ASJC) codes

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