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

Author

Oka, Y. ; Ando, A. ; Kaneko, O. ; Takeiri, Y. ; Tsumori, K. ; Akiyama, R. ; Kawamoto, T. ; Mineo, K. ; Kurata, T. ; Kuroda, T.

Author_Institution

Nat. Inst. for Fusion Sci., Nagoya, Japan

fYear

1991

fDate

30 Sep-3 Oct 1991

Firstpage

70

Abstract

A test stand for the negative-ion-based NBI (neutral beam injector) for the LHD, currently under construction, has neutral beam capabilities of 2.5 MW at a beam energy of 125 keV (H⁰)/250 keV (D⁰) and pulse duration of 10 s. Components being developed are as follows: (1) a large and high current negative ion source which is immersed in vacuum and composed of a compact modular ion source; (2) a beam dump to remove high heat flux up to 1.6 kW/cm²; (3) a high-pumping-speed (450 m³/s) cryopump; (4) a 250-kV power supply system using a GTO (gate turn-off thyristor); and (5) a controller system to vary the beam energy within 0.5 s

Keywords

fusion reactor instrumentation; ion sources; plasma heating; test equipment; 125 keV; 2.5 MW; 250 kV; 250 keV; D⁰ beam; H⁰ beam; LHD; Large Helical Device; NBI testing; compact modular ion source; controller system; cryopump; high current negative ion source; negative-ion-based neutral beam teststand; power supply system; Electron beams; Elementary particle vacuum; Fabrication; Ion beams; Ion sources; Laser excitation; Magnetic separation; Research and development; Structural beams; System testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1991. Proceedings., 14th IEEE/NPSS Symposium on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-0132-3

Type

conf

DOI

10.1109/FUSION.1991.218823

Filename

218823