title: Toroidal mode number estimation of the edge-localized modes using the KSTAR 3-D electron cyclotron emission imaging system.
abstract: A new and more accurate technique is presented for determining the toroidal mode number n of edge-localized modes (ELMs) using two independent electron cyclotron emission imaging (ECEI) systems in the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The technique involves the measurement of the poloidal spacing between adjacent ELM filaments, and of the pitch angle α* of filaments at the plasma outboard midplane. Equilibrium reconstruction verifies that α* is nearly constant and thus well-defined at the midplane edge. Estimates of n obtained using two ECEI systems agree well with n measured by the conventional technique employing an array of Mirnov coils.
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: J
authors.initials: J
authors.lastname: Lee
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: G S
authors.initials: GS
authors.lastname: Yun
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: J E
authors.initials: JE
authors.lastname: Lee
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: M
authors.initials: M
authors.lastname: Kim
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: M J
authors.initials: MJ
authors.lastname: Choi
authors.affiliation: Pohang University of Science and Technology, Pohang 790-784, South Korea.
authors.forename: W
authors.initials: W
authors.lastname: Lee
authors.affiliation: Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea.
authors.forename: H K
authors.initials: HK
authors.lastname: Park
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: C W
authors.initials: CW
authors.lastname: Domier
authors.affiliation: University of California at Davis, Davis, California 95616, USA.
authors.forename: N C
authors.initials: NC
authors.lastname: Luhmann
authors.affiliation: Columbia University, New York, New York 10027, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Sabbagh
authors.affiliation: Columbia University, New York, New York 10027, USA.
authors.forename: Y S
authors.initials: YS
authors.lastname: Park
authors.affiliation: National Fusion Research Institute, Daejeon 305-333, South Korea.
authors.forename: S G
authors.initials: SG
authors.lastname: Lee
authors.affiliation: National Fusion Research Institute, Daejeon 305-333, South Korea.
authors.forename: J G
authors.initials: JG
authors.lastname: Bak