Bistable dynamics of turbulence spreading in a corrugated temperature profile
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. Here, we argue that such bistable turbulence spreading can explain observations of hysteresis in the intensity of L-mode core turbulence.
- Authors:
-
- Univ. of California, San Diego, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1540124
- Alternate Identifier(s):
- OSTI ID: 1398124
- Grant/Contract Number:
- FG02-04ER54738
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal Issue: 10; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Physics
Citation Formats
Guo, Z. B., and Diamond, P. H. Bistable dynamics of turbulence spreading in a corrugated temperature profile. United States: N. p., 2017.
Web. doi:10.1063/1.5000850.
Guo, Z. B., & Diamond, P. H. Bistable dynamics of turbulence spreading in a corrugated temperature profile. United States. https://doi.org/10.1063/1.5000850
Guo, Z. B., and Diamond, P. H. Thu .
"Bistable dynamics of turbulence spreading in a corrugated temperature profile". United States. https://doi.org/10.1063/1.5000850. https://www.osti.gov/servlets/purl/1540124.
@article{osti_1540124,
title = {Bistable dynamics of turbulence spreading in a corrugated temperature profile},
author = {Guo, Z. B. and Diamond, P. H.},
abstractNote = {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.},
doi = {10.1063/1.5000850},
journal = {Physics of Plasmas},
number = 10,
volume = 24,
place = {United States},
year = {Thu Oct 05 00:00:00 EDT 2017},
month = {Thu Oct 05 00:00:00 EDT 2017}
}
Web of Science
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Works referencing / citing this record:
Subcritical turbulence spreading and avalanche birth
journal, March 2019
- Heinonen, R. A.; Diamond, P. H.
- Physics of Plasmas, Vol. 26, Issue 3
Scale selection and feedback loops for patterns in drift wave-zonal flow turbulence
journal, August 2019
- Guo, Weixin; Diamond, Patrick H.; Hughes, David W.
- Plasma Physics and Controlled Fusion, Vol. 61, Issue 10