Alfvén continuum in the presence of a magnetic island in a cylinder configuration

Junhui YANG; Jinjia CAO; Jianhua ZHAO; Yongzhi DAI; Dong XIANG

doi:10.1088/2058-6272/ac9de0

Plasma Science and Technology > 2023 > 25(3): 035102. > DOI: 10.1088/2058-6272/ac9de0

Junhui YANG, Jinjia CAO, Jianhua ZHAO, Yongzhi DAI, Dong XIANG. Alfvén continuum in the presence of a magnetic island in a cylinder configuration[J]. Plasma Science and Technology, 2023, 25(3): 035102. DOI: 10.1088/2058-6272/ac9de0

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Alfvén continuum in the presence of a magnetic island in a cylinder configuration

School of Nuclear Science and Technology, University of South China, Hengyang 421001, People's Republic of China

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Corresponding author:
Jinjia CAO, E-mail: caojinjia@usc.edu.cn
Received Date: June 19, 2022
Revised Date: October 19, 2022
Accepted Date: October 25, 2022
Available Online: December 06, 2023
Published Date: January 17, 2023

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Abstract

Abstract

In this work, the effect of a magnetic island on Alfvén waves is studied. A physical model is established wherein Alfvén waves propagate in the presence of a magnetic island in a cylindrical geometry. The structure of the Alfvén wave continuum is calculated by considering only the coupling caused by the periodicity in the helical angle of the magnetic island. The results show that the magnetic island can induce an upshift in the Alfvén continuum. Moreover, the coupling between different branches of the continuous spectrum becomes more significant with increasing continuum mode numbers near the boundary of the magnetic island.
- Alfvén waves,
- cylindrical geometry,
- magnetic island,
- continuum coupling

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Acknowledgments

The corresponding author, Dr Cao, appreciates the helpful discussions with Dr Axel Könies in Max-Planck-Institute for Plasma Physics in Greifswald. This work is supported by the ITER Project of Ministry of Science and Technology (No. 2022YFE03080002), National Natural Science Foundation of China (Nos. 11605088 and 12005100), the Key Scientific Research Program of Education Department of Hunan Province (Nos. 20A417 and 20A439), the National Magnetic Confinement Fusion Science Program of China (No. 2015GB110002), the Hunan Provincial Natural Science Foundation of China (No. 2017JJ3268), the International Cooperation Base Project of Hunan Province of China (No. 2018WK4009), the Key Laboratory of Magnetic Confinement Nuclear Fusion Research in Hengyang (No. 2018KJ108), and the PhD Start-Up Fund of University of South China (No. 2017XQD08).

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