Stabilization of a magnetic island by localized heating in a tokamak with stiff temperature profile

Stabilisation d'un îlot magnétique par chauffage localisé dans un tokamak avec des profils de température résilients

Patrick Maget (1) , Fabien Widmer (1) , Olivier Février (1, 2) , Xavier Garbet (1) , Hinrich Lütjens (3)

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 SPC - Swiss Plasma Center
3 CPHT - Centre de Physique Théorique [Palaiseau]

In tokamaks plasmas, turbulent transport is triggered above a threshold in the temperature gradient and leads to stiff profiles. This particularity, neglected so far in the problem of magnetic island stabilization by a localized heat source, is investigated analytically in the present paper. We show that the efficiency of the stabilization is larger than previously estimated due to the reduced turbulence level inside the island.

Domaines: Physique des plasmas [physics.plasm-ph]

Patrick Maget, Fabien Widmer, Olivier Février, Xavier Garbet, Hinrich Lütjens. Stabilization of a magnetic island by localized heating in a tokamak with stiff temperature profile. Physics of Plasmas, 2018, 25, pp.022514. ⟨10.1063/1.5021759⟩. ⟨hal-01614656⟩