JET-EFDA Contributors (Including: Mantica, P., Tala, T., Ferreira, J. S., Peeters, A. G., Salmi, A., Strintzi, D., Weiland, J., Brix, M., Giroud, C., Corrigan, G., Naulin, V., Tardini, G. and Zastrow, K. -D.). (2010) Perturbative studies of toroidal momentum transport using neutral beam injection modulation in the joint european torus: experimental results, analysis methodology, and first principles modeling. Physics of Plasmas, Vol.17 (No.9). Article: 092505 . ISSN 1070-664X

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Abstract

Perturbative experiments have been carried out in the Joint European Torus [Fusion Sci. Technol. 53 (4) (2008)] in order to identify the diffusive and convective components of toroidal momentum transport. The torque source was modulated either by modulating tangential neutral beam power or by modulating in antiphase tangential and normal beams to produce a torque perturbation in the absence of a power perturbation. The resulting periodic perturbation in the toroidal rotation velocity was modeled using time-dependent transport simulations in order to extract empirical profiles of momentum diffusivity and pinch. Details of the experimental technique, data analysis, and modeling are provided. The momentum diffusivity in the core region (0.2<p<0.8) was found to be close to the ion heat diffusivity (chi(phi)/chi(i)similar to 0.7-1.7) and a significant inward momentum convection term, up to 20 m/s, was found, leading to an effective momentum diffusivity significantly lower than the ion heat diffusivity (chi(eff)(phi)/chi(eff)(i) similar to 0.4). These results have significant implications on the prediction of toroidal rotation velocities in future tokamaks and are qualitatively consistent with recent developments in momentum transport theory. Detailed quantitative comparisons with the theoretical predictions of the linear gyrokinetic code GKW [A. G. Peeters et al., Comput. Phys. Commun. 180, 2650 (2009)] and of the quasilinear fluid Weiland model [J. Weiland, Collective Modes in Inhomogeneous Plasmas (IOP, Bristol, 2000)] are presented for two analyzed discharges. [doi:10.1063/1.3480640]

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Official Date:	September 2010
Volume:	Vol.17
Number:	No.9
Number of Pages:	20
Page Range:	Article: 092505
Identification Number:	10.1063/1.3480640
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	European Communities, EURATOM/ENEA-CNR
URI:	http://wrap.warwick.ac.uk/id/eprint/5012

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