Improvement of accelerator of negative ion source on the Large Helical Device

Journal Article · Mon Feb 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4936249· OSTI ID:22482985

Ikeda, K. ^[1]; Osakabe, M.; Tsumori, K.; Nakano, H.; Nagaoka, K.; Kaneko, O.; Takeiri, Y. ^[1]; Geng, S. ^[2]

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1. National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)
2. SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)

To improve the performance of negative-ion based neutral beam injection on the Large Helical Device, the accelerator was modified on the basis of numerical investigations. A field limiting ring was installed on the upper side of a grounded grid (GG) support and a multi-slot GG was adopted instead of a multi-aperture GG. As a result, the voltage holding capability is improved and the heat load on the GG decreases by 40%. In addition, the arc efficiency is improved significantly only by replacing the GG.

• OSTI ID: 22482985
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCELERATORS
ANIONS
APERTURES
BEAM INJECTION
EFFICIENCY
ELECTRIC POTENTIAL
GRIDS
HEATING LOAD
LHD DEVICE
PERFORMANCE