Title :
Negative-ion-based neutral beam injector for Large Helical Device
Author :
Kaneko, O. ; Oka, Y. ; Osakabe, M. ; Takeiri, Y. ; Tsumori, K. ; Akiyama, R. ; Asano, E. ; Kawamoto, Takashi ; Ando, A. ; Kuroda, T.
Author_Institution :
Nat. Inst. for Fusion Sci., Nagoya, Japan
fDate :
30 Sep-5 Oct 1995
Abstract :
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 a 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 ferromagnetic 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, high density negative hydrogen ion production, high power beam extraction and low beam divergence
Keywords :
fusion reactor design; fusion reactors; plasma beam injection heating; stellarators; 10 s; 15 MW; 180 keV; H; H- ions; LHD; Large Helical Device; beam line; error magnetic field; ferromagnetic materials; gas neutralizer; high power beam extraction; low beam divergence; magnetic bending system; negative-ion; neutral beam injection system; Acceleration; Electron beams; Fabrication; Hydrogen; Ion beams; Ion sources; Magnetic fields; Magnetic materials; Particle beams; Production;
Conference_Titel :
Fusion Engineering, 1995. SOFE '95. Seeking a New Energy Era., 16th IEEE/NPSS Symposium
Conference_Location :
Champaign, IL
Print_ISBN :
0-7803-2969-4
DOI :
10.1109/FUSION.1995.534414
