Sign on
ADS Classic is now deprecated. It will be completely retired in October 2019. This page will automatically redirect to the new ADS interface at that point.

SAO/NASA ADS Astronomy Abstract Service


· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· References in the article
· Reads History
·
· Translate This Page
Title:
Intermittent transport of nonlinear reduced models in tokomak plasmas turbulence
Authors:
Belgherras, S.; Benouaz, T.; Bekkouche, S. M. A.; Bekkouche
Affiliation:
AA(Ghardaïa University, BP 455 Airport Road, Noumerate, Ghardaïa, Algeria ()), AB(Laboratory of Electronic Physics and Modeling, University Abou Bakr Belkaïd, Tlemcen, Algeria), AC(Applied Research Unit on Renewable Energies, URAER, B.P. 88, ZI, Gart Taam Ghardaïa, Algeria), AD()
Publication:
Journal of Plasma Physics, Volume 78, Issue 6, pp. 607-615
Publication Date:
12/2012
Origin:
CUP
Abstract Copyright:
(c) 2012: Copyright © Cambridge University Press 2012
DOI:
10.1017/S0022377812000426
Bibliographic Code:
2012JPlPh..78..607B

Abstract

Understanding the origin and nature of turbulent transport in tokomak plasmas is one of the major challenges of a successful magnetic confinement fusion. The aim of this work is to study instability associated with the ion-temperature gradient (ITG)-driven turbulence in the core of the plasma, which is the seat of fusion reactions. We used a low degree of freedom model composed of 18 ordinary differential equations. When the system is slightly above the stability threshold of the ITG mode, it is considered to be in the convection regime and convective heat transport of the system is time-independent, or oscillates periodically. As ITG is increased further, the system bifurcates to the turbulent regime. In a strongly turbulent regime, intermittent bursts (the so-called avalanches) are observed. This intermittency is a result of the competition among the following three factors: generation of sheared flows and suppression of ITG turbulence, gradual reduction of the sheared flows due to viscosity, and rapid regrowth of ITG modes due to reduction of sheared flows.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)


Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints