首页|Gyro-Landau-fluid simulations of impurity effects on ion temperature gradient driven turbulence transport

Gyro-Landau-fluid simulations of impurity effects on ion temperature gradient driven turbulence transport

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The effects of impurities on ion temperature gradient(ITG)driven turbulence transport in tokamak core plasmas are investigated numerically via global simulations of microturbulence with carbon impurities and adiabatic electrons.The simulations use an extended fluid code(ExFC)based on a four-field gyro-Landau-fluid(GLF)model.The multispecies form of the normalized GLF equations is presented,which guarantees the self-consistent evolution of both bulk ions and impurities.With parametric profiles of the cyclone base case,well-benchmarked ExFC is employed to perform simulations focusing on different impurity density profiles.For a fixed temperature profile,it is found that the turbulent heat diffusivity of bulk ions in a quasi-steady state is usually lower than that without impurities,which is contrary to the linear and quasi-linear predictions.The evolutions of the temperature gradient and heat diffusivity exhibit a fast relaxation process,indicating that the destabilization of the outwardly peaked impurity profile is a transient state response.Furthermore,the impurity effects from different profiles can obviously influence the nonlinear critical temperature gradient,which is likely to be dominated by linear effects.These results suggest that the improvement in plasma confinement could be attributed to the impurities,most likely through adjusting both heat diffusivity and the critical temperature gradient.

gyro-Landau-fluid simulationimpurity effectsion temperature gradient modeturbulence transport

刘逸飞、李继全

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Southwestern Institute of Physics,Chengdu 610041,People's Republic of China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key R & D Program of ChinaHPC Platform of Southwestern Institute of Physics and Tianhe new generation supercomputer of National Supercomputer Center in Ti

U1967206122750712017YFE0301201

2024

10.1088/2058-6272/ad0c9b

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(1)
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