Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak

P. Mantica, D. Strintzi, Tuomas Tala, et al

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    Experiments were carried out in the JET tokamak to determine the critical ion temperature inverse gradient length (R=LTi ¼ RjrTij=Ti) for the onset of ion temperature gradient modes and the stiffness of Ti profiles with respect to deviations from the critical value. Threshold and stiffness have been compared
    with linear and nonlinear predictions of the gyrokinetic code GS2. Plasmas with higher values of toroidal rotation show a significant increase in R=LTi, which is found to be mainly due to a decrease of the stiffness level. This finding has implications on the extrapolation to future machines of present day results on the role of rotation on confinement.
    Original languageEnglish
    Article number175002
    Number of pages5
    JournalPhysical Review Letters
    Issue number17
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed


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