期刊
PHYSICS OF PLASMAS
卷 19, 期 6, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4719697
关键词
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资金
- European Communities
- NWO
- NWO-RFBR Centre-of-Excellence on Fusion Physics and Technology [047.018.002]
- Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231]
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. [http://dx.doi.org/10.1063/1.4719697]
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