Title | Quasilinear transport modelling at low magnetic shear |
Publication Type | Journal Article |
Year of Publication | 2012 |
Authors | J. Citrin, C. Bourdelle, P. Cottier, D.F Escande, O.D Gurcan, D.R Hatch, G.MD Hogeweij, F. Jenko, M.J Pueschel |
Journal | Physics of Plasmas |
Volume | 19 |
Number | 6 |
Pagination | 062305 |
Date Published | Jun |
Type of Article | Article |
ISBN Number | 1070-664X |
Keywords | GRADIENT-DRIVEN MODE, PARTICLE, STABILITY, TOKAMAKS, TORE-SUPRA, TURBULENCE |
Abstract | 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. (C) 2012 American Institute of Physics. |
DOI | 10.1063/1.4719697 |
Division | FP |
Department | CPP-HT |
PID | 79b0621193d64d70ed8b09d2bf00f7ca |
Alternate Title | Phys. Plasmas |
Label | OA |
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