title: Quasi 3D ECE imaging system for study of MHD instabilities in KSTAR.
abstract: A second electron cyclotron emission imaging (ECEI) system has been installed on the KSTAR tokamak, toroidally separated by 1/16th of the torus from the first ECEI system. For the first time, the dynamical evolutions of MHD instabilities from the plasma core to the edge have been visualized in quasi-3D for a wide range of the KSTAR operation (B0 = 1.7∼3.5 T). This flexible diagnostic capability has been realized by substantial improvements in large-aperture quasi-optical microwave components including the development of broad-band polarization rotators for imaging of the fundamental ordinary ECE as well as the usual 2nd harmonic extraordinary ECE.
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: G S
authors.initials: GS
authors.lastname: Yun
authors.affiliation: Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea.
authors.forename: W
authors.initials: W
authors.lastname: Lee
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: M J
authors.initials: MJ
authors.lastname: Choi
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: M
authors.initials: M
authors.lastname: Kim
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: J
authors.initials: J
authors.lastname: Leem
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: Y
authors.initials: Y
authors.lastname: Nam
authors.affiliation: Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: G H
authors.initials: GH
authors.lastname: Choe
authors.affiliation: Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea.
authors.forename: H K
authors.initials: HK
authors.lastname: Park
authors.affiliation: School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea.
authors.forename: H
authors.initials: H
authors.lastname: Park
authors.affiliation: School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea.
authors.forename: D S
authors.initials: DS
authors.lastname: Woo
authors.affiliation: School of Electrical Engineering, Kyungpook National University, Daegu 702-701, Korea.
authors.forename: K W
authors.initials: KW
authors.lastname: Kim
authors.affiliation: Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.affiliation: Department of Electrical and Computer Engineering, University of California, Davis, California 95616, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.affiliation: KASTEC, Kyushu University, Kasuga-shi, Fukuoka 812-8581, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Ito
authors.affiliation: Ube National College of Technology, Ube-shi, Yamaguchi 755-8555, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Mase
authors.affiliation: National Fusion Research Institute, Daejeon 305-333, Korea.
authors.forename: S G
authors.initials: SG
authors.lastname: Lee