Model of intermittent zonal flow structure formation

Johan Anderson; Eun Jin Kim

doi:10.1063/1.3033708

Model of intermittent zonal flow structure formation

Johan Anderson
, Eun Jin Kim

University of Sheffield

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding › peer-review

Abstract

We present a theory the PDF tails of the zonal flow formation by assuming that a modon (a bipolar vortex) drives a zonal flow through the generalized Reynolds stress. We show that the PDF tails of zonal flow formation have exponential behavior {equation presented}, with the overall amplitude ξ severely quenched by strong flow shear. It is found that stronger zonal flows are generated in ITG turbulence than Hasegawa-Mima (HM) turbulence as well as further from marginal stability. This suggests that although ITG turbulence has a higher level of heat flux, it also more likely generates stronger zonal flows, leading to a self-regulating system. It is also shown that shear flows can significantly reduce the PDF tails of structure formation.

Original language	English
Title of host publication	Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop
Editors	Olivier Sauter, Elio Sindoni, Xavier Garbet
Publisher	American Institute of Physics Inc.
Pages	247-252
Number of pages	6
ISBN (Electronic)	9780735406001
DOIs	https://doi.org/10.1063/1.3033708
Publication status	Published - 7 Nov 2008
Externally published	Yes
Event	Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas - Varenna, Italy Duration: 25 Aug 2008 → 29 Aug 2008

Publication series

Name	AIP Conference Proceedings
Volume	1069
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Workshop

Workshop	Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas
Country/Territory	Italy
City	Varenna
Period	25/08/08 → 29/08/08

Funding

This research was supported by the Engineering and Physical Sciences Research Council (EPSRC)EP/D0643I7/I.

Keywords

Drift waves
Probability Distribution Functions
Zonal flows

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.3033708

Cite this

Model of intermittent zonal flow structure formation. / Anderson, Johan; Kim, Eun Jin.
Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop. ed. / Olivier Sauter; Elio Sindoni; Xavier Garbet. American Institute of Physics Inc., 2008. p. 247-252 (AIP Conference Proceedings; Vol. 1069).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding › peer-review

Anderson, J & Kim, EJ 2008, Model of intermittent zonal flow structure formation. in O Sauter, E Sindoni & X Garbet (eds), Theory of Fusion Plasmas - Joint Varenna-Lausanne International Workshop. AIP Conference Proceedings, vol. 1069, American Institute of Physics Inc., pp. 247-252, Joint Varenna-Lausanne International Workshop on Theory of Fusion Plasmas, Varenna, Italy, 25/08/08. https://doi.org/10.1063/1.3033708

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Model of intermittent zonal flow structure formation

Abstract

Publication series

Workshop

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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