First principles fluid modelling of magnetic island stabilization by ECCD - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Plasma Physics and Controlled Fusion Année : 2016

First principles fluid modelling of magnetic island stabilization by ECCD

Résumé

Tearing modes are MHD instabilities that reduce the performances of fusion devices. They can however be controlled and suppressed using Electron Cyclotron Current Drive (ECCD) as demonstrated in various tokamaks. In this work, simulations of islands stabilization by ECCD-driven current have been carried out using the toroidal nonlinear 3D full MHD code XTOR-2F, in which a current-source term modeling the ECCD has been implemented. The efficiency parameter is computed and its variations with respect to source width and location are computed. The influence of parameters such as current intensity, source width and position with respect to the island is evaluated and compared to the Modified Rutherford Equation. We retrieve a good agreement between the simulations and the analytical predictions concerning the variations of control efficiency with source width and position. We also show that the 3D nature of the current source term can lead to the onset of an island if the source term is precisely applied on a rational surface. We report the observation of a flip phenomenon in which the O-and X-Points of the island rapidly switch their position in order for the island to take advantage of the current drive to grow.
Fichier principal
Vignette du fichier
Fevrier_PPCF2016_4HAL.pdf (2.24 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01286131 , version 1 (10-03-2016)

Licence

Copyright (Tous droits réservés)

Identifiants

Citer

Olivier Février, Patrick Maget, Hinrich Lütjens, Jean-François Luciani, Joan Decker, et al.. First principles fluid modelling of magnetic island stabilization by ECCD. Plasma Physics and Controlled Fusion, 2016, 58 (4), ⟨10.1088/0741-3335/58/4/045015⟩. ⟨hal-01286131⟩
618 Consultations
176 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More