The Plasma E × B Staircase: Turbulence Self-Regulation through Spontaneous Flow Patterning

Abstract : The E × B staircase [1, 2] is a spontaneously formed, turbulence-driven self-organising pattern of quasi-regular, long-lived and localised shear flow [3] and stress layers. These layers coincide with long-lived pressure corrugations and are interspersed between regions of turbulent avalanching. The typical spacing between these layers is mesoscale, noted ∆ ∼ 25 − 30ρ i [1, 4] —in-between the turbulence auto-correlation length c ∼ 5ρ i at micro scales and the profile macroscale L 100ρ i , see e.g. Fig.2 in [1]— and sets the outer scale of the turbulent avalanching. Here ρ i is ion Larmor radius. Whilst arresting, statistically, to mesoscales the detrimental avalanching these layers, located at the " steps of the staircase " are beneficial to confinement. The E×B staircase is thus best understood as a self-organising and dynamical set of weak or permeable transport barriers. Strong mean zonal flows are generated and endure at the steps of the staircase, resulting in localised deviations of the poloidal flow from its oft-assumed neoclassical prediction [5].
Type de document :
Direction d'ouvrage, Proceedings, Dossier
42nd European Physical Society Conference on Plasma Physics, Lisbon, Portugal, France. 2015
Liste complète des métadonnées

Littérature citée [19 références]  Voir  Masquer  Télécharger

https://hal-cea.archives-ouvertes.fr/cea-01468381
Contributeur : Guilhem Dif-Pradalier <>
Soumis le : mercredi 15 février 2017 - 13:57:44
Dernière modification le : jeudi 12 avril 2018 - 01:50:21
Document(s) archivé(s) le : mardi 16 mai 2017 - 14:47:20

Fichier

15_GDP_EPS_4pages.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : cea-01468381, version 1

Citation

Guilhem Dif-Pradalier, G Hornung, Philippe Ghendrih, R Clairet, P Diamond, et al.. The Plasma E × B Staircase: Turbulence Self-Regulation through Spontaneous Flow Patterning. 42nd European Physical Society Conference on Plasma Physics, Lisbon, Portugal, France. 2015. 〈cea-01468381〉

Partager

Métriques

Consultations de la notice

223

Téléchargements de fichiers

45