Investigation of alpha-particle transport by Alfvén eigenmodes in CFETR using a simplified diffusion model
Investigation of alpha-particle transport by Alfvén eigenmodes in CFETR using a simplified diffusion model
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DOI：
10.1088/1741-4326/ad0a0a
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Weihua Wang
中科院分区：
文献类型：
--
作者：
Zhenzhen Ren;Guoyong Fu;Wei Shen;Yang Chen;Jinhong Yang;Weihua Wang
Abstract. The aim of this work is to analyze the alpha particle transport induced by Alfvén eigenmodes (AEs) based on the latest design of China Fusion Engineering Test Reactor (CFETR). Firstly, the stability of Alfvén eigenmodes is analyzed in order to understand the physical characteristics of AEs in CFETR with latest design parameters. AEs driven by alpha particles are analyzed using the gyrokinetic ion/fluid electron hybrid code GEM. The transport of alpha particles is investigated using a reduced energetic particle transport model based on the resonance broadened quasi-linear (RBQ) model. GEM results show that AEs with many toroidal mode numbers can be destabilized simultaneously by alpha particles in CFETR, and the toroidal mode number of the most unstable mode is n=8. It is found that the excitation threshold of the alpha particle central beta for the n=8 mode is substantially below the expected alpha particle beta value of CFETR. All these results indicate that AEs can be driven strongly in CFETR plasmas. Furthermore, simulation results using the reduced transport model show that, due to multiple unstable AEs, the alpha particle density decreases in the core and alpha particles are transported from the core region (r/a0.35). In addition, we find that the minimum value of the safety factor qmin and the central beta value of alpha particle have significant effects on the alpha particle transport, and the AE-induced alpha particle transport level becomes lower with smaller linear growth rates. Finally, it is found that the radial range of the redistributed alpha particle density profile depend on the qmin radial location.
