Quasilinear transport modelling at low magnetic shear

TitleQuasilinear transport modelling at low magnetic shear
Publication TypeJournal Article
Year of Publication2012
AuthorsJ. Citrin, C. Bourdelle, P. Cottier, D.F Escande, O.D Gurcan, D.R Hatch, G.MD Hogeweij, F. Jenko, M.J Pueschel
JournalPhysics of Plasmas
Volume19
Number6
Pagination062305
Date PublishedJun
Type of ArticleArticle
ISBN Number1070-664X
KeywordsGRADIENT-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.

DOI10.1063/1.4719697
Division

FP

Department

CPP-HT

PID

79b0621193d64d70ed8b09d2bf00f7ca

Alternate TitlePhys. Plasmas
LabelOA
Attachment: 

Go back one page.