Ion heat transport studies in JET

P Mantica, C Angioni, B Baiocchi, M Baruzzo, M N A Beurskens, J P S Bizarro, R V Budny, P Buratti, A Casati, C Challis, J Citrin, G Colyer, F Crisanti, A C A Figueiredo, L Frassinetti, C Giroud, N Hawkes, J Hobirk, E Joffrin, T JohnsonE Lerche, P Migliano, Volker Naulin, A G Peeters, G Rewoldt, F Ryter, A Salmi, R Sartori, C Sozzi, G Staebler, D Strintzi, T Tala, M Tsalas, D Van Eester, T Versloot, P C deVries, J Weiland

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Detailed experimental studies of ion heat transport have been carried out in JET exploiting the upgrade of active charge exchange spectroscopy and the availability of multi-frequency ion cyclotron resonance heating with 3He minority. The determination of ion temperature gradient (ITG) threshold and ion stiffness offers unique opportunities for validation of the well-established theory of ITG driven modes. Ion stiffness is observed to decrease strongly in the presence of toroidal rotation when the magnetic shear is sufficiently low. This effect is dominant with respect to the well-known ωE×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of Te/Ti and s/q on ion threshold are found rather weak in the domain explored. Quasi-linear fluid/gyro-fluid and linear/non-linear gyro-kinetic simulations have been carried out. Whilst threshold predictions show good match with experimental observations, some significant discrepancies are found on the stiffness behaviour.
    Original languageEnglish
    JournalPlasma Physics and Controlled Fusion
    Volume53
    Issue number12
    Pages (from-to)124033
    ISSN0741-3335
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Fusion energy

    Cite this

    Mantica, P., Angioni, C., Baiocchi, B., Baruzzo, M., Beurskens, M. N. A., Bizarro, J. P. S., Budny, R. V., Buratti, P., Casati, A., Challis, C., Citrin, J., Colyer, G., Crisanti, F., Figueiredo, A. C. A., Frassinetti, L., Giroud, C., Hawkes, N., Hobirk, J., Joffrin, E., ... Weiland, J. (2011). Ion heat transport studies in JET. Plasma Physics and Controlled Fusion, 53(12), 124033. https://doi.org/10.1088/0741-3335/53/12/124033