title: New ion source for KSTAR neutral beam injection system.
abstract: The neutral beam injection system (NBI-1) of the KSTAR tokamak can accommodate three ion sources; however, it is currently equipped with only one prototype ion source. In the 2010 and 2011 KSTAR campaigns, this ion source supplied deuterium neutral beam power of 0.7-1.6 MW to the KSTAR plasma with a beam energy of 70-100 keV. A new ion source will be prepared for the 2012 KSTAR campaign with a much advanced performance compared with the previous one. The newly designed ion source has a very large transparency (∼56%) without deteriorating the beam optics, which is designed to deliver a 2 MW injection power of deuterium beams at 100 keV. The plasma generator of the ion source is of a horizontally cusped bucket type, and the whole inner wall, except the cathode filaments and plasma grid side, functions as an anode. The accelerator assembly consists of four multi-circular aperture grids made of copper and four electrode flanges made of aluminum alloy. The electrodes are insulated using PEEK. The ion source will be completed and tested in 2011.
authors.affiliation: Department of Nuclear Fusion Engineering Development, Korea Atomic Energy Research Institute, Daejeon 305-353, South Korea. tskim@kaeri.re.kr
authors.forename: Tae-Seong
authors.initials: TS
authors.lastname: Kim
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Jeong
authors.forename: Sang-Ryul
authors.initials: SR
authors.lastname: In