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In Search of the Elusive Zonal Flow Using Cross-Bicoherence Analysis
- Diamond, PH;
- Rosenbluth, MN;
- Sanchez, E;
- Hidalgo, C;
- Van Milligen, B;
- Estrada, T;
- Brañas, B;
- Hirsch, M;
- Hartfuss, HJ;
- Carreras, BA
Published Web Location
https://doi.org/10.1103/physrevlett.84.4842Abstract
We show that the modulational instability growth rate of zonal flows is determined directly from the quasilinear wave kinetic equation. We also demonstrate the relation between zonal-flow growth and the cross bispectrum of the high-frequency drift-wave-driven Reynolds stress and the low-frequency plasma potential by explicit calculation. Experimental measurements of the spatiotemporal evolution of the spectrum integrated bicoherence at the L-->H transition near the edge shear layer indicate a modification in the nonlinear phase coupling, which might be linked to the generation of sheared ExB flows.
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