title: Optical configuration optimization and calibration for the POINT system on EAST.
abstract: Calibration of the polarimeter system is one of the key elements to determine the overall measurement accuracy. The anisotropic reflection and transmission properties of the mesh beam splitters can easily distort the polarization state of the circularly polarized beams. Using a rotating crystal quartz λ/2-waveplate to replace the plasma can effectively allow us to obtain the ratio of the measured Faraday rotation angle to the known rotation angle of the waveplate. This ratio is used to estimate the calibration factor for each chord to be accurately determined and help to minimize distortions introduced by the wire-mesh beam splitters. With the novel configuration optimization, the distortion of polarization state is effectively eliminated.
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: Z Y
authors.initials: ZY
authors.lastname: Zou
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: H Q
authors.initials: HQ
authors.lastname: Liu
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: W M
authors.initials: WM
authors.lastname: Li
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: H
authors.initials: H
authors.lastname: Lian
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: S X
authors.initials: SX
authors.lastname: Wang
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: Y
authors.initials: Y
authors.lastname: Yao
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: T
authors.initials: T
authors.lastname: Lan
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: L
authors.initials: L
authors.lastname: Zeng
authors.affiliation: Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, Anhui 230031, People's Republic of China.
authors.forename: Y X
authors.initials: YX
authors.lastname: Jie