Abstract The turbulence characteristics of plasmas with internal transport barriers in the HL-2A tokamak are analyzed by means of linear gyrokinetic simulations. It is found that turbulence is dominated by the ion temperature gradient (ITG) mode together with large-scale modes characterized by high-frequency electromagnetic fluctuation, which are destabilized by the steep ion temperature gradient in the weak magnetic shear regime. Comparison with solutions of analytical dispersion relations shows that their linear features match well with the beta-induced Alfvén eigenmode branch of the shear Alfvénic spectrum. It is further clarified that the large population of fast ions in these plasmas plays a stabilization role through the dilution mechanism in high-n ITG mode regimes.
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFE0301201) and also partially by the National Natural Science Foundation of China (Grant Nos. U1967206 and 11775069).
Corresponding Authors:
Ji-Quan Li
E-mail: lijq@swip.ac.cn
Cite this article:
Wen-Hao Lin(林文浩), Ji-Quan Li(李继全), J Garcia, and S Mazzi Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas 2023 Chin. Phys. B 32 025202
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