Localized 3D control of energetic electron-driven toroidal Alfven eigenmode using resonant magnetic perturbations in the EAST tokamak
Abstract The formation of a static 3D helically localized perturbation structure of the toroidal Alfvén eigenmode (TAE) is observed for the first time under static magnetic islands induced by resonant magnetic perturbations (RMPs) in tokamak plasmas. Before the application of RMP, a TAE around 200 kHz is excited by electron cyclotron resonance heating-induced energetic electrons. After the application of n = 1 RMP, the TAE mode is localized into a helical region on the flux surface, where n is the toroidal mode number. We find that the TAE mode is strengthened near the X points of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:mi>m</mml:mi> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>3</mml:mn> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> magnetic islands and weakened near the island O points, where m is the poloidal mode number. This novel observation reveals the potential of RMPs to modify the distribution of energetic particles (EPs) both in geometry and velocity space, and hence to actively change the structure and stability of EP-driven modes in fusion plasmas.
Authors
- Youjun Hu (ORCID: https://orcid.org/0000-0002-6764-5538)
- Huihui Wang (ORCID: https://orcid.org/0000-0002-3034-0925)
- Ruijie Zhou (ORCID: https://orcid.org/0000-0001-7413-9572)
- Tonghui Shi (ORCID: https://orcid.org/0000-0002-5321-1464)
- Shouxin Wang (ORCID: https://orcid.org/0000-0001-9600-4038)
- Ang Ti (ORCID: https://orcid.org/0000-0001-9330-457X)
- Y. P. Zhang
- Yong Liu (ORCID: https://orcid.org/0000-0002-9801-9193)
- Yumin Wang (ORCID: https://orcid.org/0000-0001-5398-884X)
- M. Jia
- Y. Zhang (ORCID: https://orcid.org/0000-0002-9510-4763)
- Jizong Zhang
- Qun Ma (ORCID: https://orcid.org/0000-0001-8057-8934)
- Biao Shen (ORCID: https://orcid.org/0000-0002-5027-6158)
- S. Gu (ORCID: https://orcid.org/0000-0001-5159-939X)
- Hailin Zhao (ORCID: https://orcid.org/0000-0002-6298-1217)
- Bo Lyu (ORCID: https://orcid.org/0000-0002-3916-6230)
- Jie Ren (ORCID: https://orcid.org/0000-0002-8489-1968)
- Guoqiang Li (ORCID: https://orcid.org/0000-0003-0792-4348)
- Tao Zhang (ORCID: https://orcid.org/0000-0002-1555-6226)
- Youwen Sun (ORCID: https://orcid.org/0000-0002-9934-1328)
- Hanlin Wang (ORCID: https://orcid.org/0000-0002-5416-9392)
- Tianfu Zhou
- Yanmin Duan (ORCID: https://orcid.org/0000-0002-5800-0930)
- Qing Zang
- Haiqing Liu (ORCID: https://orcid.org/0000-0001-6892-358X)
- Nan Chu (ORCID: https://orcid.org/0000-0003-4444-1492)
- Kaiyang He
- Jinping Qian
Institutions
- University of Science and Technology of China (CN)
- Chinese Academy of Sciences (CN)
- Institute of Plasma Physics (CN)
- Tsinghua University (CN)
Publication Details
- Journal
- Nuclear Fusion
- Published
- 2025-03-17
- DOI
- https://doi.org/10.1088/1741-4326/adc142
- Citations
- 1
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 1.87
Funders
- National Natural Science Foundation of China
- China Scholarship Council