Perturbative studies of toroidal momentum transport using neutral beam injection modulation in the Joint European Torus: Experimental results, analysis methodology, and first principles modelling
Artikel i vetenskaplig tidskrift, 2010

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 < ρ < 0.8) was found to be close to the ion heat diffusivity ( φ / i ∼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 (χ φ eff /χ i eff ∼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, 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. © 2010 EURATOM.

Transport Tokamak Moment

Författare

P Mantica

Associazione EURATOM-ENEA sulla Fusione

EFDA-JET

T Tala

Teknologian Tutkimuskeskus (VTT)

EFDA-JET

J. Ferreira

EFDA-JET

Instituto Superior Tecnico

A. G. Peeters

The University of Warwick

EFDA-JET

A. Salmi

EFDA-JET

Aalto-Yliopisto

D. Strintzi

EFDA-JET

National Technical University of Athens (NTUA)

Jan Weiland

Chalmers, Institutionen för radio- och rymdvetenskap, Transportteori

Brix, M

EFDA-JET

Culham Lab

C Giroud

Culham Lab

EFDA-JET

G Corrigan

Culham Lab

EFDA-JET

V Naulin

EFDA-JET

Danmarks Tekniske Universitet (DTU)

G. Tardini

Max Planck-institutet

EFDA-JET

K. D. Zastrow

EFDA-JET

Culham Lab

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 17 9 092505- 092505

Ämneskategorier

Fysik

Fusion, plasma och rymdfysik

DOI

10.1063/1.3480640

Mer information

Senast uppdaterat

2018-06-20