Impact of divertor geometry on H-mode confinement in the JET metallic wall

E. Joffrin, P. Tamain, E. Belonohy, H. Bufferand, P. Buratti, C. D. Challis, E. Delabie, P. Drewelow, D. Dodt, L. Frassinetti, J. Garcia, C. Giroud, M. Groth, J. Hobirk, A. E. Jarvinen, H. T. Kim, F. Koechl, U. Kruezi, B. Lipschutz, P. J. LomasE. De La Luna, T. Loarer, P. Maget, C. Maggi, G. Matthews, F. Maviglia, A. Meigs, I. Nunes, G. Pucella, F. Rimini, S. Saarelma, E. Solano, A. C.C. Sips, M. Tsalas, I. Voitsekhovitch, H. Weisen

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10 Citations (Scopus)

Abstract

Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on the pedestal confinement and core normalised gradients. The corner configuration shows an increased core density gradient length and ion pressure indicating a better ion confinement. The study of neutral re-circulation indicates the neutral pressure in the main chamber varies inversely with the energy confinement and a correlation between the pedestal total pressure and the neutral pressure in the main chamber can be established. It does not appear that charge exchange losses nor momentum losses could explain this effect, but it may be that changes in edge electric potential are playing a role at the plasma edge. This study emphasizes the importance of the scrape-off layer (SOL) conditions on the pedestal and core confinement.

Original languageEnglish
Article number086025
JournalNuclear Fusion
Volume57
Issue number8
DOIs
Publication statusPublished - 30 Jun 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • confinement
  • divertor
  • neutrals

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    Joffrin, E., Tamain, P., Belonohy, E., Bufferand, H., Buratti, P., Challis, C. D., Delabie, E., Drewelow, P., Dodt, D., Frassinetti, L., Garcia, J., Giroud, C., Groth, M., Hobirk, J., Jarvinen, A. E., Kim, H. T., Koechl, F., Kruezi, U., Lipschutz, B., ... Weisen, H. (2017). Impact of divertor geometry on H-mode confinement in the JET metallic wall. Nuclear Fusion, 57(8), [086025]. https://doi.org/10.1088/1741-4326/aa6e1c