On the role of ion temperature gradient turbulence in driving ion thermal transport in neutral beam injection-heated L-mode plasmas in a superconducting tokamak

作者：P. J. Sun, Y. Ren, Weixing Wang, Xiaofeng Han, Haiqing Liu, Y.D. Li, Gongshun Li, Yifeng Wang, Baolong Hao, Yilun Zhu, X. Liu, Xiaoliang Li, Zhengping Luo, Shouxin Wang, Yuqi Chu, Yifei Jin, Shengyu Fu, Hailin Zhao, X. D. Zhang, the EAST Team · 发表于：Nuclear Fusion · 年份：2025 · DOI：10.1088/1741-4326/ade8fc · 被引用次数：4 · 研究领域：Magnetic confinement fusion research、Fusion materials and technologies、Superconducting Materials and Applications

Abstract In this paper, we report a detailed experimental study of the role of ion-temperature-gradient driven turbulence in driving ion thermal transport in neutral beam injection (NBI)-heated L-mode plasmas in Experimental Advanced Superconducting Tokamak (EAST) (Wan et al 2000 Nucl. Fusion 40 1057) coupled with linear and nonlinear gyrokinetic simulations. Significant ion-scale turbulence k ⊥ < 5 cm −1 ( k ⊥ ρ s < 1.5 , where k ⊥ is the perpendicular wavenumber and ρ s is the ion gyroradius calculated using local electron temperature T e ), measured with a microwave reflectometer, is observed in the plasma core at for r / a ≈ 0.265 and 0.5 (where r is half the diameter of the closed flux surface at a given radial position, and a is half the diameter of the last closed flux surface). Local linear stability analysis with experimental equilibrium quantities at these two radial locations using the GS2 gyrokinetic code shows that the most unstable ion-scale micro-instability is the ion temperature gradient (ITG) mode. Since the computed maximum ion-scale linear growth rates are larger than the local Waltz-Miller E × B shearing rate (Waltz and Miller 1999 Phys. Plasmas 6 4265), the E × B shear is unable to suppress ion-scale turbulence, consistent with the experimental observation of ion-scale turbulence. Experimental ion and electron thermal transports, calculated with power ...