A key to improved ion core confinement in the JET tokamak: Ion stiffness mitigation due to combined plasma rotation and low magnetic shear

P. Mantica, C. Angioni, C. Challis, G. Colyer, L. Frassinetti, N. Hawkes, T. Johnson, M. Tsalas, P.C. Devries, J. Weiland, B. Baiocchi, M. Beurskens, A. Figueiredo, C. Giroud, J. Hobirk, E. Joffrin, E. Lerche, V. Naulin, A. G. Peeters, Antti SalmiC. Sozzi, D. Strintzi, G. Staebler, Tuomas Tala, D. Van Eester, T. Versloot

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    Abstract

    New transport experiments on JET indicate that ion stiffness mitigation in the core of a rotating plasma, as described by Mantica et al. [Phys. Rev. Lett. 102, 175002 (2009)] results from the combined effect of high rotational shear and low magnetic shear. The observations have important implications for the understanding of improved ion core confinement in advanced tokamak scenarios. Simulations using quasilinear fluid and gyrofluid models show features of stiffness mitigation, while nonlinear gyrokinetic simulations do not. The JET experiments indicate that advanced tokamak scenarios in future devices will require sufficient rotational shear and the capability of q profile manipulation.
    Original languageEnglish
    Article number135004
    Number of pages5
    JournalPhysical Review Letters
    Volume107
    Issue number13
    DOIs
    Publication statusPublished - 22 Sep 2011
    MoE publication typeNot Eligible

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    Mantica, P., Angioni, C., Challis, C., Colyer, G., Frassinetti, L., Hawkes, N., Johnson, T., Tsalas, M., Devries, P. C., Weiland, J., Baiocchi, B., Beurskens, M., Figueiredo, A., Giroud, C., Hobirk, J., Joffrin, E., Lerche, E., Naulin, V., Peeters, A. G., ... Versloot, T. (2011). A key to improved ion core confinement in the JET tokamak: Ion stiffness mitigation due to combined plasma rotation and low magnetic shear. Physical Review Letters, 107(13), [135004]. https://doi.org/10.1103/PhysRevLett.107.135004