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Article Dans Une Revue Nuclear Fusion Année : 2017

Localized reversal of the perpendicular velocity in Tore Supra ohmic, L-mode, limited plasmas

Pascale Hennequin
Özgür D. Gürcan
Laure Vermare
Team The Tore Supra
  • Fonction : Auteur

Résumé

In Tore Supra plasmas, the perpendicular velocity measured by Doppler reflectometry was observed to reverse in a localized zone close to a normalized radius???0.5?0.6, changing from a negative value (corresponding to a negative radial electric field E r ) to a positive value ( ##IMG## [http://ej.iop.org/images/0029-5515/57/4/046021/nfaa59bbieqn001.gif] E_\textr>0 ). This occurs in L-mode, ohmic plasmas with a negligible external momentum input, a non-circular limited cross-section, and an edge safety factor close to 3. This reversal is favoured by a decrease in the magnetic field, or an increase in density. It is accompanied by a characteristic behaviour of the MHD activity signal, whose amplitude decrease during a ramp-down of the edge safety factor as it approaches ##IMG## [http://ej.iop.org/images/0029-5515/57/4/046021/nfaa59bbieqn002.gif] q_a∼ 3.1 ?3.2. A m / n ??=??2/1 mode is involved in the mechanism causing these observations.

Dates et versions

hal-01894827 , version 1 (12-10-2018)

Identifiants

Citer

Elisée Trier, Pascale Hennequin, Özgür D. Gürcan, R. Sabot, J. Bucalossi, et al.. Localized reversal of the perpendicular velocity in Tore Supra ohmic, L-mode, limited plasmas. Nuclear Fusion, 2017, 57 (4), pp.046021. ⟨10.1088/1741-4326/aa59bb⟩. ⟨hal-01894827⟩
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