Measurement of nonlinear mode coupling of tearing fluctuations

Autor:	K. L. Sidikman, Stewart C. Prager, S. Assadi
Rok vydání:	1992
Předmět:	Physics Coupling Reversed field pinch Oscillation General Physics and Astronomy Sawtooth wave Computational physics Magnetic field symbols.namesake Classical mechanics Physics::Plasma Physics Fourier analysis Mode coupling symbols Magnetohydrodynamics
Zdroj:	Physical Review Letters. 69:281-284
ISSN:	0031-9007
DOI:	10.1103/physrevlett.69.281
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0592f9d20180315c47fc0f9d7f627d8 https://doi.org/10.1103/physrevlett.69.281 Zobrazit plný text záznamu