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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 (Unpublished)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 > 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Unpublished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

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Other Repository

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