Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

doi:10.1088/1674-1056/ac6b23

中国物理B ›› 2023, Vol. 32 ›› Issue (2): 25202-025202.doi: 10.1088/1674-1056/ac6b23

Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

Wen-Hao Lin(林文浩)¹, Ji-Quan Li(李继全)^1,†, J Garcia², and S Mazzi³

1 Southwestern Institute of Physics, Chengdu 610041, China;
2 CEA, IRFM, 13108, Saint-Paul-lez-Durance, France;
3 EPFL, Swiss Plasma Center, Lausanne, Switzerland

收稿日期:2022-02-15 修回日期:2022-04-23 接受日期:2022-04-28 出版日期:2023-01-10 发布日期:2023-01-10
通讯作者: Ji-Quan Li E-mail:lijq@swip.ac.cn
基金资助:
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).

Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

Wen-Hao Lin(林文浩)¹, Ji-Quan Li(李继全)^1,†, J Garcia², and S Mazzi³

1 Southwestern Institute of Physics, Chengdu 610041, China;
2 CEA, IRFM, 13108, Saint-Paul-lez-Durance, France;
3 EPFL, Swiss Plasma Center, Lausanne, Switzerland

Received:2022-02-15 Revised:2022-04-23 Accepted:2022-04-28 Online:2023-01-10 Published:2023-01-10
Contact: Ji-Quan Li E-mail:lijq@swip.ac.cn
Supported by:
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).

摘要/Abstract

摘要： 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.

关键词: low-n Alfvénic modes, fast ions, gyrokinetic simulation, tokamak

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.

Key words: low-n Alfvénic modes, fast ions, gyrokinetic simulation, tokamak

中图分类号: (Waves, oscillations, and instabilities in plasmas and intense beams)

52.35.-g

52.35.Bj (Magnetohydrodynamic waves (e.g., Alfven waves)) 52.55.Pi (Fusion products effects (e.g., alpha-particles, etc.), fast particle effects) 52.65.Tt (Gyrofluid and gyrokinetic simulations)

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[J]. 中国物理B, 2023, 32(2): 25202-025202.

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[J]. Chin. Phys. B, 2023, 32(2): 25202-025202.

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Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

Gyrokinetic simulation of low-n Alfvénic modes in tokamak HL-2A plasmas

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