Research and development activities on negative ion sources

K. Tsumori, Y. Takeiri, O. Kaneko, M. Osakabe, A. Ando, K. Ikeda, K. Nagaoka, H. Nakano, E. Asano, M. Shibuya, M. Sato, T. Kondo, M. Komada

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


The research and development (R&D) activity on the negative ion sources at the National Institute for Fusion Science is described. During the R&D period from 1989 to 1998, intensive experimental investigations were carried out at a test stand with three sizes of ion source, 1/6, 1/3, and full size. Although comprehensive research had been carried out, there remained some problems on the Large Helical Device (LHD) beamlines. To resolve those problems, the ion sources and beamlines have been improved in several successive steps since the beam injection experiment of LHD started. Over the past decade, the injection energy, power, and reliability have been increased; the maximum energy now exceeds the 180-keV design value and the maximum injected powers reach 6.8 and 5.5 MW from beamlines 1 and 2, respectively.

Original languageEnglish
Pages (from-to)489-496
Number of pages8
JournalFusion Science and Technology
Issue number1
Publication statusPublished - 2010 Jan 1


  • Hydrogen
  • LHD
  • Negative ion source
  • Neutral beam injection

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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