| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Nonlinear Coupling of Reversed Shear Alfvén Eigenmode and Toroidal Alfvén Eigenmode during Current Ramp |
| Shizhao Wei1, Yahui Wang1, Peiwan Shi2,3, Wei Chen2, Ningfei Chen1, and Zhiyong Qiu1* |
1Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou 310027, China
2Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China
3Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
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| Cite this article: |
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Shizhao Wei, Yahui Wang, Peiwan Shi et al 2021 Chin. Phys. Lett. 38 035201 |
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Abstract Two novel nonlinear mode coupling processes for reversed shear Alfvén eigenmode (RSAE) nonlinear saturation are proposed and investigated. In the first process, the RSAE nonlinearly couples to a co-propagating toroidal Alfvén eigenmode (TAE) with the same toroidal and poloidal mode numbers, and generates a geodesic acoustic mode. In the second process, the RSAE couples to a counter-propagating TAE and generates an ion acoustic wave quasi-mode. The condition for the two processes to occur is favored during current ramp. Both the processes contribute to effectively saturate the Alfvénic instabilities, as well as nonlinearly transfer of energy from energetic fusion alpha particles to fuel ions in burning plasmas.
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Received: 27 November 2020
Published: 02 March 2021
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| PACS: |
52.35.Mw
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(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
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52.35.Bj
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(Magnetohydrodynamic waves (e.g., Alfven waves))
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52.35.Fp
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(Electrostatic waves and oscillations (e.g., ion-acoustic waves))
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52.30.Gz
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(Gyrokinetics)
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| Fund: Supported by the National Key R&D Program of China (Grant No. 2017YFE0301900), the National Natural Science Foundation of China (Grant No. 11875233), and the China Postdoctoral Science Foundation (Grant No. 2020M670756). |
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