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High Power Neutral Beam Injection in LHD 被引量:1

High Power Neutral Beam Injection in LHD
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摘要 The results on high power injection with the ueutral bean, injection (NBI) system for the Large Helical Device (LHD) are reported. The system consists of three beam-lines with two hydrogen negative ion (H^- ion) sources installed in each beam-line. In order to improve the injection power, a new beam accelerator with a multi-slot grounded grid (MSGG) has been developed and applied to one beam-line. Using the accelerator, a maximum power of 5.7 MW was achieved in 2003 and 2004, and the maximum energy of 189 keV was reached. The power and energy exceeded the design values of the individual beam-line for LHD. The other beam-lines also increased their injection power up to about 4 MW, and the total injection power of 13.1 MW was achieved with three beam-llnes in 2003. Although the accelerator had an advantage in high power beam injection, extracted beams expand in the short side direction of the ground-grid slot. The disadvantage has been resolved by modifying the aperture shapes of the steering grid. The results on high power injection with the ueutral bean, injection (NBI) system for the Large Helical Device (LHD) are reported. The system consists of three beam-lines with two hydrogen negative ion (H^- ion) sources installed in each beam-line. In order to improve the injection power, a new beam accelerator with a multi-slot grounded grid (MSGG) has been developed and applied to one beam-line. Using the accelerator, a maximum power of 5.7 MW was achieved in 2003 and 2004, and the maximum energy of 189 keV was reached. The power and energy exceeded the design values of the individual beam-line for LHD. The other beam-lines also increased their injection power up to about 4 MW, and the total injection power of 13.1 MW was achieved with three beam-llnes in 2003. Although the accelerator had an advantage in high power beam injection, extracted beams expand in the short side direction of the ground-grid slot. The disadvantage has been resolved by modifying the aperture shapes of the steering grid.
出处 《Plasma Science and Technology》 SCIE EI CAS CSCD 2006年第1期24-27,共4页 等离子体科学和技术(英文版)
基金 supported in part by the JSPS-CAS Core-University Program in the field of Plasma and Nuclear Fusion
关键词 NBI negative ion source NBI, negative ion source
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  • 7Tsumori K, Nagaoka K, Osakabe M, et al. Improvement of Negative Ion Source with Multi-slot Grids for LHD-NBI. Proceedings of the 20th IAEA conference FT/1-2b, Vilamoura, 2004.
  • 8Tsumori K, Kaneko O, Takeiri Y, et al. Correction of Beam Distribution in Negative Hydrogen Ion Source with Multi-slot Grounded Grid. AIP Conference Proceedings, Melville, New York, 2005, 763:35 - 46.

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