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

    Research output: Contribution to journalArticleScientificpeer-review

    112 Citations (Scopus)

    Abstract

    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
    Volume102
    Issue number17
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    stiffness
    ion temperature
    gradients
    linear prediction
    ions
    extrapolation
    temperature gradients
    critical temperature
    deviation
    thresholds
    profiles
    predictions

    Cite this

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    abstract = "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 comparedwith 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.",
    author = "P. Mantica and D. Strintzi and Tuomas Tala and et al",
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    language = "English",
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    Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak. / Mantica, P.; Strintzi, D.; Tala, Tuomas; al, et.

    In: Physical Review Letters, Vol. 102, No. 17, 175002, 2009.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - Experimental Study of the Ion Critical-Gradient Length and Stiffness Level and the Impact of Rotation in the JET Tokamak

    AU - Mantica, P.

    AU - Strintzi, D.

    AU - Tala, Tuomas

    AU - al, et

    PY - 2009

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    AB - 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 comparedwith 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.

    U2 - 10.1103/PhysRevLett.102.175002

    DO - 10.1103/PhysRevLett.102.175002

    M3 - Article

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    JO - Physical Review Letters

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