Effect of low magnetic shear induced by lower hybrid current drive on high performance internal transport barriers in the Joint European Torus (JET)

C. Castaldo, R. Cesario, A. Cardinali, X. Litaudon, Tuomas Tala, F. Crisanti, C. Cormezano, L. Panaccione, F. Santini, P. Smeulders, A. Tuccillo, Contributors to the EFDA-JET Work Programme

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    28 Citations (Scopus)

    Abstract

    A low/negative magnetic shear profile is maintained in the Joint European Torus in a plasma target with plasma current of 2.4 MA using 2.2 MW of lower hybrid (LH) power combined with neutral beam injection and ion cyclotron radiofrequency heating. In this scenario, an internal transport barrier (ITB) with time duration up to about 4 s is produced. The fraction of LH driven current is about 25% the total plasma current. During LH power application, the layer with reversed shear q-profile can be maintained in a suitable radial position to inhibit the onset of turbulence, which might otherwise drive the ITB to collapse. LH power could be used as a tool to drive moderate amounts of noninductive off-axis current and sustain high performance ITBs at high plasma current.
    Original languageEnglish
    Pages (from-to)3205-3208
    JournalPhysics of Plasmas
    Volume9
    Issue number8
    DOIs
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Tokamak devices
    • Tokamak
    • JET
    • plasma
    • plasma toroidal confinement
    • plasma transport processes
    • plasma hybrid waves
    • plasma beam injection heating
    • plasma radiofrequency heating
    • plasma turbulence

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  • Cite this

    Castaldo, C., Cesario, R., Cardinali, A., Litaudon, X., Tala, T., Crisanti, F., Cormezano, C., Panaccione, L., Santini, F., Smeulders, P., Tuccillo, A., & Programme, C. T. T. EFDA-JET. W. (2002). Effect of low magnetic shear induced by lower hybrid current drive on high performance internal transport barriers in the Joint European Torus (JET). Physics of Plasmas, 9(8), 3205-3208. https://doi.org/10.1063/1.1488951