| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Numerical study of alpha particle loss with toroidal field ripple based on CFETR steady-state scenario |
| Niuqi Li(李钮琦)1,2, Yingfeng Xu(徐颖峰)1,2,†, Fangchuan Zhong(钟方川)1,2, and Debing Zhang(张德兵)3 |
1 College of Science, Donghua University, Shanghai 201620, China;
2 Member of Magnetic Confinement Fusion Research Center, Ministry of Education, Shanghai 201620, China;
3 Department of Physics, East China University of Science and Technology, Shanghai 200237, China |
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Abstract Effects of plasma equilibrium parameters on the alpha particle loss with the toroidal field ripple based on the CFETR steady-state scenario have been numerically investigated by the orbit-following code GYCAVA. It is found that alpha particle losses decrease and loss regions become narrower with the plasma current increasing or with the magnetic field decreasing. It is because the ripple stochastic transport and the ripple well loss of alpha particle are reduced with the safety factor decreasing. Decrease of the plasma density and temperature can reduce alpha particle losses due to enhancement of the slowing-down effect. The direction of the toroidal magnetic field can significantly affect heat loads induced by lost alpha particle. The vertical asymmetry of heat loads induced by the clockwise and counter-clockwise toroidal magnetic fields are due to the fact that the ripple distribution is asymmetric about the mid-plane, which can be explained by the typical orbits of alpha particle. The maximal heat load of alpha particle for the clockwise toroidal magnetic field is much smaller than that for the counter-clockwise one.
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Received: 06 August 2023
Revised: 30 September 2023
Accepted manuscript online: 17 October 2023
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PACS:
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52.65.-y
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(Plasma simulation)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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96.50.Vg
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(Energetic particles)
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| Fund: The authors are very grateful for the help of the CFETR team. Project supported by the National Natural Science Foundation of China (Grant Nos. 12175034 and 12005063), the National Key Research and Development Program of China (Grant No. 2019YFE03030001), and the Fundamental Research Funds for the Central Universities (Grant No. 2232022G-10). |
Corresponding Authors:
Yingfeng Xu
E-mail: xuyingfeng@dhu.edu.cn
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Cite this article:
Niuqi Li(李钮琦), Yingfeng Xu(徐颖峰), Fangchuan Zhong(钟方川), and Debing Zhang(张德兵) Numerical study of alpha particle loss with toroidal field ripple based on CFETR steady-state scenario 2024 Chin. Phys. B 33 015202
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