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

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

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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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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.

U2 - 10.1088/0029-5515/49/8/085010

DO - 10.1088/0029-5515/49/8/085010

M3 - Article

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JO - Nuclear Fusion

JF - Nuclear Fusion

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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