Self-organized hybrid scenario mediated by fishbone modes in the EAST tokamak

Self-organized hybrid scenario mediated by fishbone modes in the Experimental Advanced Superconducting Tokamak (EAST) is reported in this work. In this regime, internal transport barriers(ITBs) and a flat core safety factor profile were maintained simultaneously by fishbone modes. First,the drive of low-frequency flows by fishbone modes is clarified, which subsequently suppresses turbulence transport. Besides, fishbone-induced poloidally symmetric (m = 0) toroidal current sheets were first reported experimentally, which drive outward current redistribution that mitigates core current peaking. Together, these effects enable hybrid operation with stable ITBs and robust magnetohydrodynamic (MHD) stability, revealing a self-organized pathway for sustaining hybrid scenario for fusion reactors.

Authors

Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-27
DOI
https://doi.org/10.48550/arxiv.2610.36875
Primary Topic
Magnetic confinement fusion research
Type
preprint
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preprint

Self-organized hybrid scenario mediated by fishbone modes in the EAST tokamak

J. S. Geng, C. B. Wu, H. Lian, W. T. Liu et al.
arXiv (Cornell University)
Magnetic confinement fusion research
preprint

Self-organized hybrid scenario mediated by fishbone modes in the EAST tokamak

J. S. Geng, C. B. Wu, H. Lian, W. T. Liu, Y. X. Jie, Y. F. He, W. M. Zhang, X. Z. Gong, H. L. Zhao, P. J. Sun, Y. H. Zhuge, S. Z. Yuan, S. X. Wang, Y. F. Jin, Y. X. Li, X. W. Wu, S. B. Zhang, H. B. Liu, Q. Zang, K. N. Geng, Y. Q. Chu, J. P. Qian, B. F. Gao, N. Sun, Z. Y. Qiu, L. Q. Xu, Q. Long, R. J. Zhu, K. Jia, Y. X. Hu, F. Chen, P. R. Li, L. Zhang
preprint en

Abstract

Self-organized hybrid scenario mediated by fishbone modes in the Experimental Advanced Superconducting Tokamak (EAST) is reported in this work. In this regime, internal transport barriers(ITBs) and a flat core safety factor profile were maintained simultaneously by fishbone modes. First,the drive of low-frequency flows by fishbone modes is clarified, which subsequently suppresses turbulence transport. Besides, fishbone-induced poloidally symmetric (m = 0) toroidal current sheets were first reported experimentally, which drive outward current redistribution that mitigates core current peaking. Together, these effects enable hybrid operation with stable ITBs and robust magnetohydrodynamic (MHD) stability, revealing a self-organized pathway for sustaining hybrid scenario for fusion reactors.

arXiv (Cornell University)
Magnetic confinement fusion research
DOIOpen Access PDFOpenAlex
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Self-organized hybrid scenario mediated by fishbone modes in the EAST tokamak — J. S. Geng, C. B. Wu, et al. · arXiv (Cornell University) (2026) | TGRS Research Map | TGRS