Ion heat transport studies in JET

JET-EFDA collaborators

    Research output: Contribution to journalArticleScientificpeer-review

    19 Citations (Scopus)

    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 ω E×B threshold up-shift and plays a major role in enhancing core confinement in hybrid regimes and ion internal transport barriers. The effects of T e/T i 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
    Article number124033
    Number of pages17
    JournalPlasma Physics and Controlled Fusion
    Volume53
    Issue number12
    DOIs
    Publication statusPublished - 1 Dec 2011
    MoE publication typeNot Eligible
    Event38th EPS Conference on Plasma Physics - Strasbourg, France
    Duration: 27 Jun 20111 Jul 2011

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