Cross-scale Interaction between Microturbulence and Fishbone in Fusion Plasmas
Abstract
Global gyrokinetic simulations are performed for the first time to investigate cross-scale interactions between electromagnetic ion temperature gradient (ITG) turbulence and fishbone instability in tokamak plasmas. The investigation of fluctuation response in the multiscale simulation including both instabilities indicates a strong impact of fishbone on ITG turbulence. Detailed analysis reveals that fishbone-driven zonal radial electric fields at nonlinear saturation significantly suppress electromagnetic ITG turbulence, reducing ion thermal transport close to the neoclassical level. The simulation results agree well with experimental observations that turbulence suppression during fishbone bursts. These findings advance understanding of multiscale interactions that enhance thermal confinement in fusion plasmas.
Keywords
Cite
@article{arxiv.2511.04051,
title = {Cross-scale Interaction between Microturbulence and Fishbone in Fusion Plasmas},
author = {Yuehao Ma and Bin Zhang and Pengfei Liu and Jian Bao and Zhihong Lin and Huishan Cai and Liutian Gao and AhDi Liu and Hailin Zhao and Tao Zhang},
journal= {arXiv preprint arXiv:2511.04051},
year = {2025}
}