Bifurcation and scaling of drift wave turbulence intensity with collisional zonal flow damping

Citation
Ma. Malkov et Ph. Diamond, Bifurcation and scaling of drift wave turbulence intensity with collisional zonal flow damping, PHYS PLASMA, 8(9), 2001, pp. 3996-4009
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
9
Year of publication
2001
Pages
3996 - 4009
Database
ISI
SICI code
1070-664X(200109)8:9<3996:BASODW>2.0.ZU;2-7
Abstract
Interacting drift wave-zonal flow turbulence is examined at the spectral le vel of description using an extended "predator-prey" model. Analytic soluti ons that describe both the linear scaling of transport with ion-ion collisi onality as well as the saturation regime are obtained for a simple model of drift wave turbulence. A theory of self-regulation in this system is prese nted. The possibility of bifurcation to a state with higher turbulence leve l and transport is demonstrated. This bifurcation is associated with the ap pearance of a condensate solution at the largest scales. The possible relev ance of this phenomenon to the bursting events of turbulence and transport recently observed in gyrokinetic simulations of ITG instability is discusse d. (C) 2001 American Institute of Physics.