title: Modification to the accelerator of the NBI-1B ion source for improving the injection efficiency.
abstract: Minimizing power loss of a neutral beam imposes modification of the accelerator of the ion source for further improvement of the beam optics. The beam optics can be improved by focusing beamlets. The injection efficiencies by the steering of ion beamlets are investigated numerically to find the optimum modification of the accelerator design of the NBI-1B ion source. The beam power loss was reduced by aperture displacement of three edge beamlets arrays considering power loadings on the beamline components. Successful testing and operation of the ion source at 60 keV/84% of injection efficiency led to the possibility of enhancing the system capability to a 2.4 MW power level at 100 keV/1.9 μP.
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: T S
authors.initials: TS
authors.lastname: Kim
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: S H
authors.initials: SH
authors.lastname: Jeong
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: D H
authors.initials: DH
authors.lastname: Chang
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: S R
authors.initials: SR
authors.lastname: In
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: M
authors.initials: M
authors.lastname: Park
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: B K
authors.initials: BK
authors.lastname: Jung
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 34057, South Korea.
authors.forename: K W
authors.initials: KW
authors.lastname: Lee
authors.affiliation: National Fusion Research Institute, Daejeon 34143, South Korea.
authors.forename: S J
authors.initials: SJ
authors.lastname: Wang
authors.affiliation: National Fusion Research Institute, Daejeon 34143, South Korea.
authors.forename: Y S
authors.initials: YS
authors.lastname: Bae
authors.affiliation: National Fusion Research Institute, Daejeon 34143, South Korea.
authors.forename: H T
authors.initials: HT
authors.lastname: Park
authors.affiliation: National Fusion Research Institute, Daejeon 34143, South Korea.
authors.forename: J S
authors.initials: JS
authors.lastname: Kim
authors.affiliation: National Fusion Research Institute, Daejeon 34143, South Korea.
authors.forename: W
authors.initials: W
authors.lastname: Cho
authors.affiliation: National Fusion Research Institute, Daejeon 34143, South Korea.
authors.forename: D J
authors.initials: DJ
authors.lastname: Choi