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

被引：1
|
作者：
Lin, Wen-Hao [1 ]
Li, Ji-Quan [1 ]
Garcia, J. [2 ]
Mazzi, S. [3 ]
机构：
[1] Southwestern Inst Phys, Chengdu 610041, Peoples R China
[2] CEA, IRFM, F-13108 St Paul Les Durance, France
[3] Ecole Polytech Fed Lausanne, Swiss Plasma Ctr, Lausanne, Switzerland
来源：
CHINESE PHYSICS B | 2023年 / 32卷 / 02期
基金：
中国国家自然科学基金;
关键词：
low-n Alfvenic modes; fast ions; gyrokinetic simulation; tokamak; SHEAR;
D O I：
10.1088/1674-1056/ac6b23
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
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 Alfven eigenmode branch of the shear Alfvenic 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.
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页数：8
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