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<p>A negative ion source neutral beam injection (NNBI) test facility is under construction at the large Chinese research infrastructure, the Comprehensive Research Facility for Fusion Technology (CRAFT). The CRAFT NNBI test facility aims to explore and master the key technologies of external heating neutral beam systems for future large-scale fusion reactors. Converting energetic ions from the ion source into neutral particles (i.e., neutralization) is a key process in NBI systems that can determine the final injection power. The first neutralization experiments at the CRAFT NNBI test facility were conducted using a dual-driver negative ion source. The beam energy was 120–170&#xa0;keV, and the negative ion beam current was 7–13&#xa0;A (118–220&#xa0;A/m<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(^{2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>2</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>). With proper gas feeding into the neutralizer, a neutralization efficiency of approximately 60% could be achieved. For the design and analysis of the overall process of beam transmission inside the beamline, a Monte Carlo-based model was built to simulate the beam particle launch, beam particle motion, rarefied gas flow, and beam–gas interaction. The model was used to analyze the first neutralization experiments, and the simulated results showed good agreement with the experimental data.</p>

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First neutralization experiments and simulations on the CRAFT negative ion source neutral beam injection test facility

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Bin Li,
  • Jiang-Long Wei,
  • Wei Yi,
  • Li-Zhen Liang,
  • Yong-Jian Xu,
  • Wei Liu,
  • Yu-Wen Yang,
  • Hui-Hui Hong,
  • Yuan-Lai Xie

摘要

A negative ion source neutral beam injection (NNBI) test facility is under construction at the large Chinese research infrastructure, the Comprehensive Research Facility for Fusion Technology (CRAFT). The CRAFT NNBI test facility aims to explore and master the key technologies of external heating neutral beam systems for future large-scale fusion reactors. Converting energetic ions from the ion source into neutral particles (i.e., neutralization) is a key process in NBI systems that can determine the final injection power. The first neutralization experiments at the CRAFT NNBI test facility were conducted using a dual-driver negative ion source. The beam energy was 120–170 keV, and the negative ion beam current was 7–13 A (118–220 A/m \(^{2}\) 2 ). With proper gas feeding into the neutralizer, a neutralization efficiency of approximately 60% could be achieved. For the design and analysis of the overall process of beam transmission inside the beamline, a Monte Carlo-based model was built to simulate the beam particle launch, beam particle motion, rarefied gas flow, and beam–gas interaction. The model was used to analyze the first neutralization experiments, and the simulated results showed good agreement with the experimental data.