Gyrokinetic studies of core turbulence features in ASDEX Upgrade H-mode plasmas

被引:27
|
作者
Navarro, A. Banon [1 ,2 ]
Happel, T. [1 ]
Goerler, T. [1 ]
Jenko, F. [1 ,2 ,3 ]
Abiteboul, J. [1 ]
Bustos, A. [1 ]
Doerk, H. [1 ]
Told, D. [1 ,2 ]
机构
[1] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[3] Max Planck Princeton Ctr Plasma Phys, Garching, Germany
基金
欧洲研究理事会;
关键词
D O I
10.1063/1.4919022
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
Gyrokinetic validation studies are crucial for developing confidence in the model incorporated in numerical simulations and thus improving their predictive capabilities. As one step in this direction, we simulate an ASDEX Upgrade discharge with the GENE code, and analyze various fluctuating quantities and compare them to experimental measurements. The approach taken is the following. First, linear simulations are performed in order to determine the turbulence regime. Second, the heat fluxes in nonlinear simulations are matched to experimental fluxes by varying the logarithmic ion temperature gradient within the expected experimental error bars. Finally, the dependence of various quantities with respect to the ion temperature gradient is analyzed in detail. It is found that density and temperature fluctuations can vary significantly with small changes in this parameter, thus making comparisons with experiments very sensitive to uncertainties in the experimental profiles. However, cross-phases are more robust, indicating that they are better observables for comparisons between gyrokinetic simulations and experimental measurements.
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页数:10
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