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. Challis, A.G. Peeters, D. Strintzi, T. Tala, M. Tsalas, P.C. deVries, B. Baiocchi, M. Baruzzo, J. Bizarro, P. Buratti, J. Citrin, G. Colyer, F. Crisanti, X. Garbet, C. Giroud, N. Hawkes, J. Hobirk, F. Imbeaux, E. JoffrinT. Johnson, E. Lerche, J. Mailloux, Volker Naulin, A. Salmi, C. Sozzi, G. Staebler, D. Van Eester, T. Versloot, J. Weiland

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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. © 2011 American Physical Society
    Original languageEnglish
    JournalPhysical Review Letters
    Volume107
    Issue number13
    Pages (from-to)135004
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2011

    Bibliographical note

    Copyright 2011 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society

    Keywords

    • Fusion energy

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