Energetic negative ion source for fusion at NIFS (invited)

T. Kuroda, O. Kaneko, Y. Takeiri, Y. Oka, K. Tsumori, E. Asano, T. Kawamoto, R. Akiyama, A. Ando, T. Takanashi, M. Hamabe

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Large high current hydrogen negative ion sources have been developed for the negative ion based neutral beam injector of the Large Helical Device (LHD) at NIFS. The prototype of the negative ion source is required to deliver a negative ion beam of 45 A at the beam energy of 125 keV. The optimization of 1/3 scale ion sources which are multicusp ion source with a rod and an external magnetic filter, respectively, has been investigated for the operation parameter of the plasma source. A total H current of 16 A is extracted at an operating pressure of 0.9–0.45 Pa with Cs seeding operation. Negative hydrogen ion current is proportional to the input arc power and a beam current density of 45 mA/cm2 is attained. The beam extraction and acceleration characteristics are studied for a single‐stage and a two‐stage acceleration electrode. A beam divergence angle of 5 mrad is obtained. The results of research and development of a hydrogen negative ion source at NIFS will be reviewed.

Original languageEnglish
Pages (from-to)1114-1119
Number of pages6
JournalReview of Scientific Instruments
Volume67
Issue number3
DOIs
Publication statusPublished - 1996 Mar

Keywords

  • AMP BEAM CURRENTS
  • BEAM EXTRACTION
  • BEAM PROFILES
  • HYDROGEN IONS 1 MINUS
  • ION SOURCES
  • KEV RANGE 100−1000
  • NEUTRAL ATOM BEAM INJECTION
  • PLASMA
  • TORSATRON STELLARATORS

ASJC Scopus subject areas

  • Instrumentation

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