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, Aaro Järvinen, 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, JET Contributors

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    29 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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