| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Numerical study on fast particle confinement in Chinese first quasi-axisymmetric stellarator |
| Yi-Hang Shou(寿毅航)1, Xian-Qu Wang(王先驱)1,†, Zhi-Ru Li(李志儒)1, Yu-Cai Li(栗钰彩)1, Yu-Hong Xu(许宇鸿)1, Jun Cheng(程钧)1, Hai-Feng Liu(刘海峰)1, Jie Huang(黄捷)1, Xin Zhang(张欣)1, Hai Liu(刘海)1, Jun-Feng Shen(沈军峰)1, Jun Hu(胡军)1, and Chang-Jian Tang(唐昌建)2 |
1 Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China;
2 School of Physical Science and Technology, Sichuan University, Chengdu 610041, China |
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Abstract Fast particle confinement in the Chinese first quasi-axisymmetric stellarator (CFQS) is investigated using the MEGA code, comparing the standard quasi-axisymmetric (QA) configuration with a finite-beta $(\langle \beta \rangle=0.74\%)$ equilibrium featuring magnetic islands. In the standard QA configuration, the drift associated with the vertical magnetic curvature term, $(\boldsymbol{\nabla} \times \boldsymbol{b})_z$, is identified as the dominant loss mechanism, especially for co-passing particles. In the finite-beta configuration, magnetic islands trap low-energy particles. The $(\boldsymbol{\nabla} \times \boldsymbol{b})_z$ drift modulates this trapping, promoting escape for co-passing particles while reinforcing trapping for counter-passing particles, and remains a significant contributor to overall losses. These findings underscore the critical role of the $(\boldsymbol{\nabla} \times \boldsymbol{b})_z$ drift and the added complexities of magnetic islands for energetic particle confinement in finite-beta stellarator plasmas.
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Received: 18 April 2025
Revised: 28 July 2025
Accepted manuscript online: 06 August 2025
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PACS:
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52.55.Hc
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(Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices)
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52.55.Dy
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(General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.)
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52.55.-s
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(Magnetic confinement and equilibrium)
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28.52.-s
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(Fusion reactors)
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| Fund: The authors would like to thank Prof. Y. Todo for the MEGA code. Project supported by the National MCF Energy Research and Development Program of China (Grant No. 2024YFE03170001), the National Natural Science Foundation of China (Grant No. U22A20262), the Fundamental Research Funds for the Central Universities (Grant No. 2682024ZTPY035), the Science and Technology Plan Project in Sichuan Province of China (Grant No. 2022JDJQ0036), NIFS International Collaborations with Overseas Laboratories (Grant No. UFEX105), NIFS Promotion of Magnetic Confinement Research using Helical Devices in Asia (Grant No. URSX108), the NIFS General Collaboration Project (Grant Nos. NIFS18KBAP041, NIFS20KBAP067, NIFS20KBAE001, NIFS22KIPH009, NIFS22KIPH011, and NIFS22KIEE001), and ‘PLADyS’, JSPS Core-to-Core Program, A. Advanced Research Networks. |
Corresponding Authors:
Xian-Qu Wang
E-mail: xianquwang@swjtu.edu.cn
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Cite this article:
Yi-Hang Shou(寿毅航), Xian-Qu Wang(王先驱), Zhi-Ru Li(李志儒), Yu-Cai Li(栗钰彩), Yu-Hong Xu(许宇鸿), Jun Cheng(程钧), Hai-Feng Liu(刘海峰), Jie Huang(黄捷), Xin Zhang(张欣), Hai Liu(刘海), Jun-Feng Shen(沈军峰), Jun Hu(胡军), and Chang-Jian Tang(唐昌建) Numerical study on fast particle confinement in Chinese first quasi-axisymmetric stellarator 2026 Chin. Phys. B 35 035204
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