Construction of negative-ion-based neutral beam teststand for Large Helical Device (LHD)

Oka, Y.; Andõ, Akira; Kaneko, O.; Takeiri, Y.; Tsumori, K.; Akiyama, R.; Kawamoto, T.; Mineo, K.; Kurata, T.; Kuroda, Takeshi

doi:10.1109/fusion.1991.218823

Cited by 2 publications

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“…The R&D of high current negative ion sources has been carried out in our high power negative ion test stand [ 5 ] . We confirmed that the cesiated discharge in multi-cusp ion source with adequate magnetic filter configuration could produce dense negative hydrogen ions.…”

Section: Introductionmentioning

confidence: 99%

Negative-ion-based neutral beam injector for Large Helical Device

Kaneko

Oka

Osakabe

et al.

Proceedings of 16th International Symposium on Fusion Engineering

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Fabrication of a 15 MW, 10 sec. negative-ion-based neutral beam injection system has been started for Large Helical Device (LHD). The system is composed of two beam lines. Each beam line has two ion sources which are designed to deliver 40 A negative hydrogen ions at the beam energy of 180 keV. The beam line has a long gas neutralizer, and magnetic bending system to deal with residual ions. The beam line has also a bending system for accelerated electrons, which we think necessary. Special attention is paid to reduce ferro-magnetic materials in the beam line, because helical systems are sensitive to the error magnetic field. The design is based on the results of our R&D on the large negative hydrogen ion source; the high density negative hydrogen ion production, high power beam extraction, and low beam divergence.

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Section: Introductionmentioning

confidence: 99%