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 (Unpublished)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 > 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
Publisher:	-
Place of Publication:	-
Official Date:	December 2010
Dates:	Date Event December 2010 Published
Status:	Peer Reviewed
Publication Status:	Unpublished
Access rights to Published version:	Restricted or Subscription Access
Related URLs:	Other Repository

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