Gyrokinetic turbulent transport simulation of a high ion temperature plasma in large helical device experiment

被引：50

作者：

Nunami, M. ^{[1
]}

Watanabe, T. -H. ^{[1
,2
]}

Sugama, H. ^{[1
,2
]}

Tanaka, K. ^{[1
]}

机构：

[1] Natl Inst Fus Sci, Toki, Gifu 5095292, Japan

[2] Grad Univ Adv Studies, Toki, Gifu 5095292, Japan

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 04期

关键词：

ZONAL FLOWS;

D O I：

10.1063/1.4704568

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Ion temperature gradient turbulent transport in the large helical device (LHD) is investigated by means of gyrokinetic simulations in comparison with the experimental density fluctuation measurements of ion-scale turbulence. The local gyrokinetic Vlasov simulations are carried out incorporating full geometrical effects of the LHD configuration, and reproduce the turbulent transport levels comparable to the experimental results. Reasonable agreements are also found in the poloidal wavenumber spectra of the density fluctuations obtained from the simulation and the experiment. Numerical analysis of the spectra of the turbulent potential fluctuations on the two-dimensional wavenumber space perpendicular to the magnetic field clarifies the spectral transfer into a high radial wavenumber region which correlates with the regulation of the turbulent transport due to the zonal flows. The resultant transport levels at different flux surfaces are expressed in terms of a simple linear relation between the transport coefficient and the ratio of the squared turbulent potential fluctuation to the averaged zonal flow amplitude. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4704568]

引用

页数：7