Nonlinear saturation of reversed shear Alfvén eigenmode via high-frequency quasi-mode generation

Zhiwen CHENG; Guangyu WEI; Lei YE; Zhiyong QIU

doi:10.1088/2058-6272/ad8814

Plasma Science and Technology > 2025 > 27(1): 015101. > DOI: 10.1088/2058-6272/ad8814 CSTR: 32219.14.2058-6272/ad8814

Zhiwen CHENG, Guangyu WEI, Lei YE, Zhiyong QIU. Nonlinear saturation of reversed shear Alfvén eigenmode via high-frequency quasi-mode generation[J]. Plasma Science and Technology, 2025, 27(1): 015101. DOI: 10.1088/2058-6272/ad8814

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Nonlinear saturation of reversed shear Alfvén eigenmode via high-frequency quasi-mode generation

1.
Institute for Fusion Theory and Simulation, School of Physics, Zhejiang University, Hangzhou 310027, People’s Republic of China
2.
CAS Key Laboratory of Frontier Physics in Controlled Nuclear Fusion and Institutes of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
3.
Center for Nonlinear Plasma Science, ENEA C.R. Frascati, Frascati 00044, Italy

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Author Bio:
Zhiyong QIU: zqiu@ipp.ac.cn
Corresponding author:
Zhiyong QIU, zqiu@ipp.ac.cn
Received Date: June 08, 2024
Revised Date: October 15, 2024
Accepted Date: October 16, 2024
Available Online: October 17, 2024
Published Date: December 30, 2024

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Abstract

Abstract

A nonlinear saturation mechanism for reversed shear Alfvén eigenmode (RSAE) is proposed and analyzed, and is shown to be of relevance to typical reactor parameter region. The saturation is achieved through the generation of high-frequency quasi-mode due to nonlinear coupling of two RSAEs, which is then damped due to coupling with the shear Alfvén continuum, and leads to the nonlinear saturation of the primary RSAEs. An estimation of the nonlinear damping rate is also provided.
- reversed shear Alfvén eigenmode,
- nonlinear mode coupling,
- continuum damping,
- gyrokinetic theory

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Acknowledgments

This work was supported by the Strategic Priority Research Program of Chinese Academy of Sciences (No. XDB0790000), the Collaborative Innovation Program of Hefei Science Center, CAS (No. 2022HSC-CIP008), and National Natural Science Foundation of China (Nos. 12275236 and 12261131622).

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