Accueil Imprimer Annuaire Plan du site Crédits Fil RSS du site Twitter LinkedIn Plans d'accès Contacts Annuaire Webmail Intranet outils & logiciels Logo

Accueil > A propos du LPP > Communication > Actualités archivées > 2020 > Make tokamak plasmas rotate by small axisymmetric magnetic disturbances

Make tokamak plasmas rotate by small axisymmetric magnetic disturbances

Toutes les versions de cet article : [English] [français]

La rotation du plasma joue un rôle crucial dans le confinement de chaleur et de particules dans les tokamaks, y compris dans l’apparition du mode H de confinement amélioré.

Plasma rotation plays a crucial role on heat and particle confinement in tokamaks including the appareance of the H (high confinement) mode.

The classical equilibrium equation for tokamak plasma is the Grad-Shafranov equation, that neglects the plasma velocity and involves the pressure gradient although pressure is just a passive scalar and not an actuator. We must then go further to consider the issue of plasma velocity within a magnetohydrodynamic framework.

In the article just released Oueslati, Firpo, Physics of Plasmas 27, 102501 (2020), the axisymmetric steady states of the visco-resistive magnetohydrodynamic equations, including the non-linear (v.∇)v term, have been computed using the finite element method.

Playing on boundary conditions with external magnetic perturbations offers a way to break the natural up-down symmetry of the system and produce a net toroidal flow.

Using realistic parameters, some numerical results indicate that small perturbations of the magnetic configuration may be used to increase steady-state speeds and promote tokamak plasma confinement while preserving axisymmetry (which is a good way to prevent turbulence).

Dans la même rubrique :


transparent
CNRS Ecole Polytechnique Sorbonne Université Université Paris-Saclay Observatoire de Paris
transparent
©2009-2025 Laboratoire de Physique des Plasmas (LPP)

Mentions légales
Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Anne Bourdon (Directrice)

Accessibilité