title: Improvement of a plasma uniformity of the 2nd ion source of KSTAR neutral beam injector.
abstract: The 2nd ion source of KSTAR (Korea Superconducting Tokamak Advanced Research) NBI (Neutral Beam Injector) had been developed and operated since last year. A calorimetric analysis revealed that the heat load of the back plate of the ion source is relatively higher than that of the 1st ion source of KSTAR NBI. The spatial plasma uniformity of the ion source is not good. Therefore, we intended to identify factors affecting the uniformity of a plasma density and improve it. We estimated the effects of a direction of filament current and a magnetic field configuration of the plasma generator on the plasma uniformity. We also verified that the operation conditions of an ion source could change a uniformity of the plasma density of an ion source.
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353, South Korea.
authors.forename: S H
authors.initials: SH
authors.lastname: Jeong
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353, South Korea.
authors.forename: T S
authors.initials: TS
authors.lastname: Kim
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353, South Korea.
authors.forename: K W
authors.initials: KW
authors.lastname: Lee
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353, South Korea.
authors.forename: D H
authors.initials: DH
authors.lastname: Chang
authors.affiliation: Korea Atomic Energy Research Institute, Daejeon 305-353, South Korea.
authors.forename: S R
authors.initials: SR
authors.lastname: In
authors.affiliation: National Fusion Research Institute, Daejeon 305-806, South Korea.
authors.forename: Y S
authors.initials: YS
authors.lastname: Bae