title: Post calibration of the two-dimensional electron cyclotron emission imaging instrument with electron temperature characteristics of the magnetohydrodynamic instabilities.
abstract: The electron cyclotron emission imaging (ECEI) instrument is widely used to study the local electron temperature (Te) fluctuations by measuring the ECE intensity IECE ∝ Te in tokamak plasmas. The ECEI measurement is often processed in a normalized fluctuation quantity against the time averaged value due to complication in absolute calibration. In this paper, the ECEI channels are relatively calibrated using the flat Te assumption of the sawtooth crash or the tearing mode island and a proper extrapolation. The 2-D relatively calibrated electron temperature (Te,rel) images are reconstructed and the displacement amplitude of the magnetohydrodynamic modes can be measured for the accurate quantitative growth analysis.
authors.affiliation: National Fusion Research Institute, Daejeon 34133, South Korea.
authors.forename: M J
authors.initials: MJ
authors.lastname: Choi
authors.affiliation: National Fusion Research Institute, Daejeon 34133, South Korea.
authors.forename: H K
authors.initials: HK
authors.lastname: Park
authors.affiliation: Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, South Korea.
authors.forename: G S
authors.initials: GS
authors.lastname: Yun
authors.affiliation: Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, South Korea.
authors.forename: Y B
authors.initials: YB
authors.lastname: Nam
authors.affiliation: Pohang University of Science and Technology, Pohang, Gyeongbuk 790-784, South Korea.
authors.forename: G H
authors.initials: GH
authors.lastname: Choe
authors.affiliation: Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea.
authors.forename: W
authors.initials: W
authors.lastname: Lee
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: S
authors.initials: S
authors.lastname: Jardin