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

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.
Authors:
;  [1] ; ; ; ; ; ;  [1] ;  [2] ;  [3]
  1. National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)
  2. (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)
  3. SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi, Toki, Gifu 509-5292 (Japan)
Publication Date:
OSTI Identifier:
22482985
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCELERATORS; ANIONS; APERTURES; BEAM INJECTION; EFFICIENCY; ELECTRIC POTENTIAL; GRIDS; HEATING LOAD; LHD DEVICE; PERFORMANCE