title: Edge profile measurements using Thomson scattering on the KSTAR tokamak.
abstract: In the KSTAR Tokamak, a "Tangential Thomson Scattering" (TTS) diagnostic system has been designed and installed to measure electron density and temperature profiles. In the edge system, TTS has 12 optical fiber bundles to measure the edge profiles with 10-15 mm spatial resolution. These 12 optical fibers and their spatial resolution are not enough to measure the pedestal width with a high accuracy but allow observations of L-H transition or H-L transitions at the edge. For these measurements, the prototype ITER edge Thomson Nd:YAG laser system manufactured by JAEA in Japan is installed. In this paper, the KSTAR TTS system is briefly described and some TTS edge profiles are presented and compared against the KSTAR Charge Exchange Spectroscopy and other diagnostics. The future upgrade plan of the system is also discussed in this paper.
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: S
authors.initials: S
authors.lastname: Oh
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: W R
authors.initials: WR
authors.lastname: Lee
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: W H
authors.initials: WH
authors.lastname: Ko
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: K P
authors.initials: KP
authors.lastname: Kim
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: K D
authors.initials: KD
authors.lastname: Lee
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: Y M
authors.initials: YM
authors.lastname: Jeon
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: S W
authors.initials: SW
authors.lastname: Yoon
authors.affiliation: National Fusion Research Institute, Daejeon, South Korea.
authors.forename: K W
authors.initials: KW
authors.lastname: Cho
authors.affiliation: National Institute for Fusion Science, Nagoya, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Narihara
authors.affiliation: National Institute for Fusion Science, Nagoya, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Yamada
authors.affiliation: National Institute for Fusion Science, Nagoya, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Yasuhara
authors.affiliation: Japan Atomic Energy Agency, Naka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hatae
authors.affiliation: Japan Atomic Energy Agency, Naka, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Yatsuka
authors.affiliation: Japan Atomic Energy Agency, Naka, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ono
authors.affiliation: Department of Physics, KAIST, South Korea.
authors.forename: J H
authors.initials: JH
authors.lastname: Hong