Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Simulations for the cesium dynamics of the RF-driven prototype ion source for CRAFT N-NBI

  • Yalong Yang (Anhui Province Key Laboratory of Intelligent Building and Building Energy Saving, Anhui Jianzhu University) ;
  • Yong Wu (Anhui Province Key Laboratory of Intelligent Building and Building Energy Saving, Anhui Jianzhu University) ;
  • Lizhen Liang (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Jianglong Wei (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Rui Zhang (Anhui Province Key Laboratory of Intelligent Building and Building Energy Saving, Anhui Jianzhu University) ;
  • Yahong Xie (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Wei Liu (Institute of Plasma Physics, Chinese Academy of Sciences) ;
  • Chundong Hu (Institute of Plasma Physics, Chinese Academy of Sciences)
  • Received : 2023.08.22
  • Accepted : 2023.11.08
  • Published : 2024.04.25
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Abstract

To realize an initial objective of the negative ion-based neutral beam injection (N-NBI) at the Comprehensive Research Facility for Fusion Technology (CRAFT) test facility, which targets an H0 beam power of 2 MW at an energy of 200-400 keV and a pulse duration of 100 s, it is crucial to study the cesium dynamics of the negative ion source. Here a numerical simulation program CSFC3D is developed and applied to simulate the distribution and time dynamics of cesium during short pulses. The calculations show that most of the cesium on the plasma grid (PG) area originates from the release of cesium that is accumulated within the ion source in the plasma phase. Increasing the wall temperature reduces the loss of cesium on the wall of the ion source. Furthermore, the thickness of the cesium monolayer is directly influenced by the PG temperature. Both simulated and experimental results demonstrate that maintaining the PG temperature between 180 ℃ and 200 ℃ is essential for enhancing the performance of the ion source and optimizing the cesium behavior.

Keywords

Acknowledgement

The authors are very grateful to the other members of the ASIPP NBI team for their continuous support and excellent work. This work was partly supported by the HFIPS Director's Fund (YZJJQY202204, 2021YZGH02), the National Natural Science Foundation of China (Contract No. 11975264), the Comprehensive Research Facility for Fusion Technology Program of China (Contract No. 2018-000052-73-01-001228), the Science Foundation of institute of Plasma Physics, Chinese Academy of Sciences (No. DSJJ-2023-07) and the University Synergy Innovation Program of Anhui Province (GXXT-2022-003).

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