Angular Momentum Studies with NBI Modulation in JET

G. Tardini, J. Ferreira, P. Mantica, A.G. Peeters, Tuomas Tala, K.D. Zastrow, M. Brix, C. Giroud, G.V. Pereverzev, JET-EFDA Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    17 Citations (Scopus)

    Abstract

    In this work we apply the neutral beam modulation technique to a set of JET discharges in order to obtain information on the radial transport of the toroidal angular momentum. This perturbative technique allows one to separate possible pinch terms from the momentum diffusivity, otherwise impossible to decouple with a steady-state momentum balance analysis alone. In this paper a model based on the ion temperature gradient turbulence, which consists of a constant and uniform Prandtl number of the order unity combined with an inward Coriolis pinch term predicted by the gyro-kinetic theory, is validated against data from the JET experiment. The machine size and the good space and time resolution of the charge exchange system make JET particularly suitable for this study. The experimental data are matched with good accuracy, both the steady-state and the transient propagation of the momentum perturbation, choosing a Prandtl number slightly above one, provided the Coriolis pinch is included. Sensitivity studies assess the accuracy range of our predictive modelling.
    Original languageEnglish
    Article number085010
    JournalNuclear Fusion
    Volume49
    Issue number8
    DOIs
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    angular momentum
    Prandtl number
    momentum
    modulation
    neutral beams
    ion temperature
    kinetic theory
    charge exchange
    diffusivity
    unity
    temperature gradients
    turbulence
    perturbation
    propagation
    sensitivity

    Cite this

    Tardini, G., Ferreira, J., Mantica, P., Peeters, A. G., Tala, T., Zastrow, K. D., ... JET-EFDA Contributors (2009). Angular Momentum Studies with NBI Modulation in JET. Nuclear Fusion, 49(8), [085010]. https://doi.org/10.1088/0029-5515/49/8/085010
    Tardini, G. ; Ferreira, J. ; Mantica, P. ; Peeters, A.G. ; Tala, Tuomas ; Zastrow, K.D. ; Brix, M. ; Giroud, C. ; Pereverzev, G.V. ; JET-EFDA Contributors. / Angular Momentum Studies with NBI Modulation in JET. In: Nuclear Fusion. 2009 ; Vol. 49, No. 8.
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    abstract = "In this work we apply the neutral beam modulation technique to a set of JET discharges in order to obtain information on the radial transport of the toroidal angular momentum. This perturbative technique allows one to separate possible pinch terms from the momentum diffusivity, otherwise impossible to decouple with a steady-state momentum balance analysis alone. In this paper a model based on the ion temperature gradient turbulence, which consists of a constant and uniform Prandtl number of the order unity combined with an inward Coriolis pinch term predicted by the gyro-kinetic theory, is validated against data from the JET experiment. The machine size and the good space and time resolution of the charge exchange system make JET particularly suitable for this study. The experimental data are matched with good accuracy, both the steady-state and the transient propagation of the momentum perturbation, choosing a Prandtl number slightly above one, provided the Coriolis pinch is included. Sensitivity studies assess the accuracy range of our predictive modelling.",
    author = "G. Tardini and J. Ferreira and P. Mantica and A.G. Peeters and Tuomas Tala and K.D. Zastrow and M. Brix and C. Giroud and G.V. Pereverzev and {JET-EFDA Contributors}",
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    Tardini, G, Ferreira, J, Mantica, P, Peeters, AG, Tala, T, Zastrow, KD, Brix, M, Giroud, C, Pereverzev, GV & JET-EFDA Contributors 2009, 'Angular Momentum Studies with NBI Modulation in JET', Nuclear Fusion, vol. 49, no. 8, 085010. https://doi.org/10.1088/0029-5515/49/8/085010

    Angular Momentum Studies with NBI Modulation in JET. / Tardini, G.; Ferreira, J.; Mantica, P.; Peeters, A.G.; Tala, Tuomas; Zastrow, K.D.; Brix, M.; Giroud, C.; Pereverzev, G.V.; JET-EFDA Contributors.

    In: Nuclear Fusion, Vol. 49, No. 8, 085010, 2009.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Angular Momentum Studies with NBI Modulation in JET

    AU - Tardini, G.

    AU - Ferreira, J.

    AU - Mantica, P.

    AU - Peeters, A.G.

    AU - Tala, Tuomas

    AU - Zastrow, K.D.

    AU - Brix, M.

    AU - Giroud, C.

    AU - Pereverzev, G.V.

    AU - JET-EFDA Contributors,

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    AB - In this work we apply the neutral beam modulation technique to a set of JET discharges in order to obtain information on the radial transport of the toroidal angular momentum. This perturbative technique allows one to separate possible pinch terms from the momentum diffusivity, otherwise impossible to decouple with a steady-state momentum balance analysis alone. In this paper a model based on the ion temperature gradient turbulence, which consists of a constant and uniform Prandtl number of the order unity combined with an inward Coriolis pinch term predicted by the gyro-kinetic theory, is validated against data from the JET experiment. The machine size and the good space and time resolution of the charge exchange system make JET particularly suitable for this study. The experimental data are matched with good accuracy, both the steady-state and the transient propagation of the momentum perturbation, choosing a Prandtl number slightly above one, provided the Coriolis pinch is included. Sensitivity studies assess the accuracy range of our predictive modelling.

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    JO - Nuclear Fusion

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    SN - 0029-5515

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    ER -

    Tardini G, Ferreira J, Mantica P, Peeters AG, Tala T, Zastrow KD et al. Angular Momentum Studies with NBI Modulation in JET. Nuclear Fusion. 2009;49(8). 085010. https://doi.org/10.1088/0029-5515/49/8/085010