Article Dans Une Revue Nuclear Fusion Année : 2021

Approaching detachment in I-mode—response of core confinement and the edge pedestal in the ASDEX Upgrade tokamak

M.L. Reinke
  • Fonction : Auteur
O. Grover
  • Fonction : Auteur
A.E. Hubbard
  • Fonction : Auteur
L. Gil
  • Fonction : Auteur
A. Merle
E. Viezzer
M. Willensdorfer
  • Fonction : Auteur

Résumé

Experiments on nitrogen assisted divertor detachment in the improved energy confinement mode (I-mode) are reported from the ASDEX Upgrade tokamak. When nitrogen is introduced into the divertor and radiation losses cool the divertor plasma down, a loss of core confinement is observed, concomitant with an increase in low frequency edge fluctuation levels. The loss in confinement can be compensated and the I-mode can be maintained by additional heating power input. Detachment of the inner divertor leg has been observed for the first time in an I-mode discharge. The outer divertor leg remains attached in these experiments. Good energy confinement properties (H98(y, 2) = 0.9) during the detachment of the inner divertor leg are reported.

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hal-03242583 , version 1 (18-03-2024)

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T. Happel, M.L. Reinke, D. Silvagni, M. Bernert, O. Grover, et al.. Approaching detachment in I-mode—response of core confinement and the edge pedestal in the ASDEX Upgrade tokamak. Nuclear Fusion, 2021, 61 (3), pp.036026. ⟨10.1088/1741-4326/abd7b7⟩. ⟨hal-03242583⟩
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