Three-dimensional fluid simulation for the effects of argon additive in a negative hydrogen ion source for fusion

IF 2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-08-28 DOI:10.1016/j.fusengdes.2025.115405

Si-Yu Xing , Shi-Bo Li , Fei Gao , Yu-Ru Zhang , Miao Zhao , Shao-Fei Geng , Guang-Jiu Lei , You-Nian Wang

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Abstract

To enhance the volume generation of negative ions in ion source for China Fusion Engineering Test Reactor (CFETR) neutral beam injection systems, a three-dimensional fluid model is developed in this paper. The difference between pure hydrogen and H₂/Ar mixed discharges is explored under various discharge conditions and magnetic field configurations. The results show that the negative hydrogen ion density 5 cm above the plasma grid increases by up to 44 % when Ar is added at low pressure (0.3 Pa). However, the enhancement effect is weakened at high pressure (0.5 or 1 Pa). By introducing the magnetic shield, the negative hydrogen ion density 5 cm above the plasma grid in pure hydrogen discharges is increased by 142 %. Surprisingly, the combined effect of magnetic shield and Ar addition result in a 236 % increase in negative hydrogen ion density, which exceeded the sum of each of them (186 %). In addition, the negative hydrogen ion density first rises and then falls with increasing magnetic filter field strength, and the highest density is achieved at 0.15 T. It is also found that the addition of Ar has the best effect on the enhancement of negative ion density at 0.15 T.

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负氢离子源中氩添加剂对聚变影响的三维流体模拟

为了提高中国聚变工程试验堆（CFETR）中性束注入系统离子源中负离子的体积生成，建立了一个三维流体模型。探讨了纯氢和H2/Ar混合放电在不同放电条件和磁场配置下的差异。结果表明，在低压（0.3 Pa）条件下，在等离子体栅格上方5cm处加入Ar，负氢离子密度提高了44%。然而，在高压下（0.5或1pa），增强效应减弱。通过引入磁屏蔽，纯氢放电中等离子体栅极上方5cm处的负氢离子密度提高了142%。令人惊讶的是，磁屏蔽和添加Ar的联合作用使负氢离子密度增加了236%，超过了它们各自的总和（186%）。此外，随着磁滤场强度的增加，氢负离子密度先上升后下降，在0.15 T时达到最高密度，还发现添加Ar在0.15 T时对负离子密度的增强效果最好。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.