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The life-cycle of drift-wave turbulence driven by small scale instability

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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 (Unpublished)

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Abstract

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, Engineering and Medicine > Research Centres > Centre for Complexity Science
Faculty of Science, Engineering and Medicine > Science > Mathematics
Library of Congress Subject Headings (LCSH): Plasma instabilities, Plasma turbulence, Waves -- Mathematical models, Nuclear fusion
Series Name: ArXiv pre-print
Publisher: -
Place of Publication: -
Official Date: December 2010
Dates:
DateEvent
December 2010Published
Status: Peer Reviewed
Publication Status: Unpublished
Access rights to Published version: Restricted or Subscription Access
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