Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade

B. Labit, T. Eich, G. F. Harrer, E. Wolfrum, M. Bernert, M. G. Dunne, L. Frassinetti, P. Hennequin, R. Maurizio, A. Merle, H. Meyer, S. Saarelma, U. Sheikh, J. Adamek, M. Agostini, D. Aguiam, R. Akers, R. Albanese, C. Albert, E. AlessiR. Ambrosino, Y. Andr be, C. Angioni, G. Apruzzese, M. Aradi, H. Arnichand, F. Auriemma, G. Avdeeva, J. M. Ayllon-Guerola, F. Bagnato, V. K. Bandaru, M. Barnes, L. Barrera-Orte, P. Bettini, R. Bilato, O. Biletskyi, P. Bilkova, W. Bin, P. Blanchard, T. Blanken, V. Bobkov, A. Bock, D. Boeyaert, K. Bogar, O. Bogar, Antti Hakola, Aapeli Lahtinen, Jari Likonen, Antti Salmi, Tuomas Tala, JET EUROfusion Consortium

    Research output: Contribution to journalArticleScientificpeer-review

    36 Citations (Scopus)

    Abstract

    Within the EUROfusion MST1 work package, a series of experiments has been conducted on AUG and TCV devices to disentangle the role of plasma fueling and plasma shape for the onset of small ELM regimes. On both devices, small ELM regimes with high confinement are achieved if and only if two conditions are fulfilled at the same time. Firstly, the plasma density at the separatrix must be large enough (ne,sep/nG ∼ 0.3), leading to a pressure profile flattening at the separatrix, which stabilizes type-I ELMs. Secondly, the magnetic configuration has to be close to a double null (DN), leading to a reduction of the magnetic shear in the extreme vicinity of the separatrix. As a consequence, its stabilizing effect on ballooning modes is weakened.

    Original languageEnglish
    Article number086020
    Number of pages13
    JournalNuclear Fusion
    Volume59
    Issue number8
    DOIs
    Publication statusPublished - 26 Jun 2019
    MoE publication typeA1 Journal article-refereed

    Funding

    This work has been carried out within the framework of the EUROfusion Consortium and received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under Grant Agreeement No. 633053. G.F. Harrer is a fellow of the Friedrich Schiedel Foundation for Energy Technology. This work was supported in part by the Swiss National Science Foundation.

    Keywords

    • ballooning modes
    • grassy ELMs
    • H-mode
    • plasma triangularity
    • separatrix density
    • type-II ELMs

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