High confinement hybrid scenario in JET and its significance for ITER

E. Joffrin, J. Hobirk, M. Beurskens, M. Brix, P. Buratti, C. Challis, F. Crisanti, C. Giroud, F. Imbeaux, D.C. McDonald, P. Maget, P. Mantica, F. Rimini, A.C.C. Sips, Tuomas Tala, I. Voitsekovitch, J. Citrin, J. García, I. Jenkins, J. LonnrothL. Frassinetti, M. Piovesan, G. Sergienko, JET-EFDA contributors

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific


    In the last campaigns, JET has extended the hybrid scenario with q profile close to unity in the plasma core to higher confinement (H98y2 up to 1.4-1.5) for both high and low triangularity. This has been achieved by creating a large region of weak magnetic in the plasma core. With these performances, 50% of the total current is generated non-inductively would produce in ITER a discharge of 1000s duration. The effect of this broad q profiles shape could reduce transport in the core in particular in the low shape scenario which also has the strongest rotation gradients. With broad q profile neoclassical tearing mode stability is shown to be improved. The pedestal does not seem to depend crucially on the modification of the magnetic shear, but shows a constant improvement with power and β. This improvement is more pronounced at low shape than low shape. High shapes can also be affected by high recycling flux that can impact on the pedestal confinement. Given the inapplicability of existing confinement scaling law at βN higher than 2, the extrapolation of these scenarios to ITER is using instead a dimensionless approach. There is good prospect to produce in ITER long pulse operation with Q approaching 10 but there are large uncertainties in particular with respect to the role of rotation on transport.
    Original languageEnglish
    Title of host publicationProceedings of the 23rd IAEA Fusion Energy Conference
    PublisherInternational Atomic Energy Agency IAEA
    Publication statusPublished - 2010
    MoE publication typeNot Eligible
    Event23rd IAEA Fusion Energy Conference, FEC 2010 - Daejon, Korea, Republic of
    Duration: 10 Oct 201016 Oct 2010


    Conference23rd IAEA Fusion Energy Conference, FEC 2010
    Country/TerritoryKorea, Republic of


    • plasma physics
    • fusion energy


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