Article Dans Une Revue Physics of Plasmas Année : 2012

Quasilinear transport modelling at low magnetic shear

Jonathan Citrin
C. Bourdelle
P. Cottier
  • Fonction : Auteur
D.F. Escande
  • Fonction : Auteur
D.R. Hatch
  • Fonction : Auteur
G.M.D. Hogeweij
  • Fonction : Auteur
F. Jenko
  • Fonction : Auteur
M.J. Pueschel
  • Fonction : Auteur

Résumé

Accurate and computationally inexpensive transport models are vital for routine and robust predictions of tokamak turbulent transport. To this end, the QuaLiKiz [Bourdelle et al., Phys. Plasmas 14, 112501 (2007)] quasilinear gyrokinetic transport model has been recently developed. QuaLiKiz flux predictions have been validated by non-linear simulations over a wide range in parameter space. However, a discrepancy is found at low magnetic shear, where the quasilinear fluxes are significantly larger than the non-linear predictions. This discrepancy is found to stem from two distinct sources: the turbulence correlation length in the mixing length rule and an increase in the ratio between the quasilinear and non-linear transport weights, correlated with increased non-linear frequency broadening. Significantly closer agreement between the quasilinear and non-linear predictions is achieved through the development of an improved mixing length rule, whose assumptions are validated by non-linear simulations.

Dates et versions

hal-01550989 , version 1 (29-06-2017)

Identifiants

Citer

Jonathan Citrin, C. Bourdelle, P. Cottier, D.F. Escande, Özgür D. Gürcan, et al.. Quasilinear transport modelling at low magnetic shear. Physics of Plasmas, 2012, 19, pp.062305. ⟨10.1063/1.4719697⟩. ⟨hal-01550989⟩
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