Merging beam experiment of intense negative ions for advanced compact neutral beam injectors

Author

Inoue, T. ; Miyamoto, K. ; Mizuno, M. ; Okumura, Y. ; Ohara, Y. ; Ackerman, G.D. ; Chan, C.F. ; Cooper, W.S. ; Kwan, J.W. ; Vella, M.C.

Author_Institution

Naka Fusion Res. Establ., JAERI, Ibaraki, Japan

Volume

1

fYear

1993

fDate

11-15 Oct 1993

Firstpage

474

Abstract

A test of intense beam production with a JAERI negative ion source and an ESQ accelerator is in progress under US-JAPAN collaborative program between JAERI and LBL. In the first series of the experiments, a merging beam system with an extractor composed of spherical shaped curved grids are used to merge multiple-beams into a single high current beam to be accelerated by an ESQ accelerator. The H^- ions of 104 mA were extracted from nineteen apertures (10 mm dia.) drilled in an area of 80 mmφ. Using the merging beam system with a focal length of 150 mm, the beamlets were successfully focused and the beam envelope diameter was compressed to 23 mm. Focusing angle of the merging beam envelope at the entrance of the accelerator could be reduced within the range of -30 (converging)~+30 (diverging) mrad, which is acceptable in the ESQ accelerator to obtain a high energy beam

Keywords

fusion reactor design; ion sources; negative ions; plasma radiofrequency heating; 10 mm; 104 mA; 150 mm; 23 mm; ESQ accelerator; H^- ions; JAERI negative ion source; advanced compact neutral beam injectors; beam envelope diameter; converging; diverging; extractor; focal length; focusing angle; intense negative ions; merging beam envelope; merging beam experiment; single high current beam; spherical shaped curved grids; Acceleration; Apertures; Collaboration; Ion accelerators; Ion sources; Life estimation; Merging; Particle beams; Production; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1993., 15th IEEE/NPSS Symposium on

Conference_Location

Hyannis, MA

Print_ISBN

0-7803-1412-3

Type

conf

DOI

10.1109/FUSION.1993.518375

Filename

518375