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Article Dans Une Revue Physics of Plasmas Année : 2015

Comprehensive comparisons of geodesic acoustic mode characteristics and dynamics between Tore Supra experiments and gyrokinetic simulations

A. Storelli
  • Fonction : Auteur
Laure Vermare
Pascale Hennequin
Özgür D. Gürcan
Guilhem Dif-Pradalier
Y. Sarazin
X. Garbet
T. Görler
  • Fonction : Auteur
Rameswar Singh
  • Fonction : Auteur
Pierre Morel
Virginie Grandgirard
Philippe Ghendrih
Team Tore Supra
  • Fonction : Auteur

Résumé

In a dedicated collisionality scan in Tore Supra, the geodesic acoustic mode (GAM) is detected and identified with the Doppler backscattering technique. Observations are compared to the results of a simulation with the gyrokinetic code GYSELA. We found that the GAM frequency in experiments is lower than predicted by simulation and theory. Moreover, the disagreement is higher in the low collisionality scenario. Bursts of non harmonic GAM oscillations have been characterized with filtering techniques, such as the Hilbert-Huang transform. When comparing this dynamical behaviour between experiments and simulation, the probability density function of GAM amplitude and the burst autocorrelation time are found to be remarkably similar. In the simulation, where the radial profile of GAM frequency is continuous, we observed a phenomenon of radial phase mixing of the GAM oscillations, which could influence the burst autocorrelation time.

Dates et versions

hal-01550958 , version 1 (29-06-2017)

Identifiants

Citer

A. Storelli, Laure Vermare, Pascale Hennequin, Özgür D. Gürcan, Guilhem Dif-Pradalier, et al.. Comprehensive comparisons of geodesic acoustic mode characteristics and dynamics between Tore Supra experiments and gyrokinetic simulations. Physics of Plasmas, 2015, 22 (6), ⟨10.1063/1.4922845⟩. ⟨hal-01550958⟩
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