GENERATION OF SHEARED FLOW AND ITS EFFECT ON TRANSPORT BASED ON NONLINEAR INTERCHANGE MODE

Citation
A. Takayama et M. Wakatani, GENERATION OF SHEARED FLOW AND ITS EFFECT ON TRANSPORT BASED ON NONLINEAR INTERCHANGE MODE, Journal of the Korean Physical Society, 31, 1997, pp. 167-170
Citations number
13
Categorie Soggetti
Physics
ISSN journal
03744884
Volume
31
Year of publication
1997
Supplement
S
Pages
167 - 170
Database
ISI
SICI code
0374-4884(1997)31:<167:GOSFAI>2.0.ZU;2-J
Abstract
Nonlinear evolution of interchange mode is investigated in a scrape-of f layer plasma with unfavorable magnetic curvature using both a direct numerical simulation of nonlinear MHD model and a low-order dynamical model. Both results show that when the Rayleigh number exceeds a crit ical value, the zonal counter-streaming flow is generated in the perpe ndicular direction to the ambient magnetic field, which makes the fluc tuation level suppress. The reduction of transport is not stationary, but oscillatory or intermittent, which resembles the behavior of the E dge Localized Mode observed in tokamak H-mode experiments. The low-ord er model is usable to investigate mechanism of sheared flow generation during the nonlinear evolution of interchange mode.