Bistable dynamics of turbulence spreading in a corrugated temperature profile

Guo, Z. B.; Diamond, P. H.

doi:10.1063/1.5000850

Title: Bistable dynamics of turbulence spreading in a corrugated temperature profile

Journal Article · Thu Oct 05 00:00:00 EDT 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5000850· OSTI ID:1540124

Guo, Z. B. ^[1]; Diamond, P. H. ^[1]

Univ. of California, San Diego, CA (United States)

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. Here, we argue that such bistable turbulence spreading can explain observations of hysteresis in the intensity of L-mode core turbulence.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER54738

OSTI ID:: 1540124

Alternate ID(s):: OSTI ID: 1398124

Journal Information:: Physics of Plasmas, Vol. 24, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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