title: Development of high-speed and wide-angle visible observation diagnostics on Experimental Advanced Superconducting Tokamak using catadioptric optics.
abstract: A new wide-angle endoscope for visible light observation on the Experimental Advanced Superconducting Tokamak (EAST) has been recently developed. The head section of the optical system is based on a mirror reflection design that is similar to the International Thermonuclear Experimental Reactor-like wide-angle observation diagnostic on the Joint European Torus. However, the optical system design has been simplified and improved. As a result, the global transmittance of the system is as high as 79.6% in the wavelength range from 380 to 780 nm, and the spatial resolution is <5 mm for the full depth of field (4000 mm). The optical system also has a large relative aperture (1:2.4) and can be applied in high-speed camera diagnostics. As an important diagnostic tool, the optical system has been installed on the HT-7 (Hefei Tokamak-7) for its final experimental campaign, and the experiments confirmed that it can be applied to the investigation of transient processes in plasma, such as ELMy eruptions in H-mode, on EAST.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, Hefei, Anhui 230031, People's Republic of China.
authors.forename: J H
authors.initials: JH
authors.lastname: Yang
authors.forename: X F
authors.initials: XF
authors.lastname: Yang
authors.forename: L Q
authors.initials: LQ
authors.lastname: Hu
authors.forename: Q
authors.initials: Q
authors.lastname: Zang
authors.forename: X F
authors.initials: XF
authors.lastname: Han
authors.forename: C Q
authors.initials: CQ
authors.lastname: Shao
authors.forename: T F
authors.initials: TF
authors.lastname: Sun
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: T F
authors.initials: TF
authors.lastname: Wang
authors.forename: F J
authors.initials: FJ
authors.lastname: Li
authors.forename: A L
authors.initials: AL
authors.lastname: Hu