Alpha particle confinement in CFEDR H-mode scenario

Abstract The alpha particle confinement in the CFEDR H-mode scenario is investigated. It is found that, within engineering limitations, 500 mm ferromagnetic insert can reduce the alpha particle and power loss caused by magnetic ripples to 1% and 0.65%, respectively, leading to an acceptable 0.1 MW/m 2 peak heat load on the outboard mid-plane of plasma facing components. Global gyrokinetic simulations show that multiple toroidal Alfvén eigenmodes (TAEs) with toroidal mode number n ~ 20−40 can be driven marginally unstable by alpha particles in the core region, with 2%. Here, is the linear growth rate, and is the mode frequency. Multiple- nonlinear simulations show that TAEs saturate at a low saturation level, that lead to a negligible alpha particle diffusion rate ~ 0.06 m 2 /s. Fishbone is shown to be unstable in the present scenario, which may lead to weak radial redistribution of alpha particles, with the dominant contribution from magnetically trapped particles.

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Publication Details

Journal
Plasma Science and Technology
Published
2025-06-24
DOI
https://doi.org/10.1088/2058-6272/ade7ed
Citations
1
Primary Topic
Magnetic confinement fusion research
Type
article
Field-Weighted Citation Impact
1.87

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Alpha particle confinement in CFEDR H-mode scenario

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Magnetic confinement fusion research
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Alpha particle confinement in CFEDR H-mode scenario

Wei Shen, Yingfeng Xu, Zhenzhen 珍珍 REN 任, Guoqiang Li, Jiale Chen, Yifeng 艺峰 ZHENG 郑, Zhiyong 志勇 QIU 仇, Youjun 友俊 HU 胡, Jian 健 BAO 包, Pengjuan 鹏娟 SU 苏, Feng 丰 WANG 王
article en
1 citations

Abstract

Abstract The alpha particle confinement in the CFEDR H-mode scenario is investigated. It is found that, within engineering limitations, 500 mm ferromagnetic insert can reduce the alpha particle and power loss caused by magnetic ripples to 1% and 0.65%, respectively, leading to an acceptable 0.1 MW/m 2 peak heat load on the outboard mid-plane of plasma facing components. Global gyrokinetic simulations show that multiple toroidal Alfvén eigenmodes (TAEs) with toroidal mode number n ~ 20−40 can be driven marginally unstable by alpha particles in the core region, with 2%. Here, is the linear growth rate, and is the mode frequency. Multiple- nonlinear simulations show that TAEs saturate at a low saturation level, that lead to a negligible alpha particle diffusion rate ~ 0.06 m 2 /s. Fishbone is shown to be unstable in the present scenario, which may lead to weak radial redistribution of alpha particles, with the dominant contribution from magnetically trapped particles.

Plasma Science and TechnologyVol. 27(10)
Anhui University (CN), Donghua University (CN), Chinese Academy of Sciences (CN), Dalian University of Technology (CN), Hefei Institutes of Physical Science (CN), Institute of Plasma Physics (CN), Institute of Physics (CN)
National Key Research and Development Program of China
Openalex Percentile: Top 13%
Magnetic confinement fusion research
1.87
DOISourceOpenAlex
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