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- W2763488052 abstract "We present a new model of turbulence spreading in magnetically confined plasma. A basic question in turbulence spreading is how to sustain finite amplitude fluctuations in a stable subcritical region, where linear dissipation of the turbulence is strong? The answer to this question relies on a consistent treatment of mesoscale temperature profile corrugation and microscale turbulence. We argue that inhomogeneous mixing of the turbulence corrugates the mean temperature profile and that the temperature corrugation then induces subcritical bifurcation of the turbulence. Thus, the system will transition from a metastable “laminar” state to an absolutely stable, excited state. Incorporating spatial coupling of the locally excited turbulent regions, a front forms. This front connects the excited and laminar states and penetrates the linear stable region efficiently. We argue that such bistable turbulence spreading can explain observations of hysteresis in the intensity of L-mode core turbulence." @default.
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- W2763488052 date "2017-10-01" @default.
- W2763488052 modified "2023-10-17" @default.
- W2763488052 title "Bistable dynamics of turbulence spreading in a corrugated temperature profile" @default.
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- W2763488052 doi "https://doi.org/10.1063/1.5000850" @default.
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