The life-cycle of drift-wave turbulence driven by small scale instability
Connaughton, Colm, Nazarenko, Sergey and Quinn, Brenda E. (2010) The life-cycle of drift-wave turbulence driven by small scale instability. UNSPECIFIED. -: -. ArXiv pre-print . (Unpublished)
WRAP_Connaughton_life_cycle_1008.3338v2.pdf - Submitted Version - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
We demonstrate theoretically and numerically the zonal-flow/drift-wave feedback mechanism for the LH transition in an idealised model of plasma turbulence driven by a small scale instability. Zonal flows are generated by a secondary modulational instability of the modes which are directly driven by the primary instability. The zonal flows then suppress the small scales thereby arresting the energy injection into the system, a process which can be described using nonlocal wave turbulence theory. Finally, the arrest of the energy input results in saturation of the zonal flows at a level which can be estimated from the theory and the system reaches stationarity without damping of the large scales.
|Item Type:||Working or Discussion Paper (UNSPECIFIED)|
|Subjects:||Q Science > QA Mathematics
Q Science > QC Physics
|Divisions:||Faculty of Science > Centre for Complexity Science
Faculty of Science > Mathematics
|Library of Congress Subject Headings (LCSH):||Plasma instabilities, Plasma turbulence, Waves -- Mathematical models, Nuclear fusion|
|Series Name:||ArXiv pre-print|
|Place of Publication:||-|
|Official Date:||December 2010|
|Access rights to Published version:||Restricted or Subscription Access|
 F. Wagner et al., Phys. Rev. Lett. 49, 1408 (1982).
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