@article{7614,
  author = {J. Citrin and C. Bourdelle and P. Cottier and D. F. Escande and O. D. Gurcan and D. R. Hatch and G. M. D. Hogeweij and F. Jenko and M. J. Pueschel},
  title = {Quasilinear transport modelling at low magnetic shear},
  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.
},
  year = {2012},
  journal = {Physics of Plasmas},
  volume = {19},
  number = {6},
  pages = {062305},
  month = {Jun},
  isbn = {1070-664X},
  doi = {10.1063/1.4719697},
  note = {ISI Document Delivery No.: 966JYTimes Cited: 0Cited Reference Count: 38},
  language = {English},
}