Long, TAllcock, J SNie, LSharples, R MXu, MKe, RZhang, SSilburn, S AHoward, JohnYu, YYuan, BWang, Z HSong, X MLiu, LDuan, X R2022-07-292022-07-290034-6748http://hdl.handle.net/1885/270037A new Doppler coherence imaging spectroscopy interferometer has been developed on the HL-2A tokamak for the scrape-off-layer impurity flow measurement. Its spatial resolution is estimated to be up to ∼0.8 mm in the horizontal direction and ∼9 mm in the vertical direction, with a field of view of ∼34○. Its typical temporal resolution is about 1 ms. This salient feature allows for time-resolved 2D measurements in short-time phenomena on HL-2A, such as edge localized modes. Group delay and interference fringe pattern were calibrated with a dedicated calibration system. The robustness of group delay calibration and the feasibility of the extrapolation model for fringe pattern calibration are demonstrated. In this paper, we report the details of the optical instruments, calibration, and the initial experimental results of this Doppler coherence imaging spectroscopy interferometer.This work was supported by the National Key R&D Program of China under Grant Nos. 2017YFE0301201, 2018YFE0309103, and 2018YFE0303100 and the National Natural Science Foundation of China under Grant Nos. 11905050, 11705052, 11875124, and U1867222. This work was also supported by the Engineering and Physical Sciences Research Council (Grant No. EP/L01663X/1) and a Royal Society International Exchanges 2015 Cost Share China award (Grant No. IE150624). This work was carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom Research and Training Programme 2014–2018 under Grant Agreement No. 633053 and from the RCUK (Grant No. EP/T012250/1). The views and opinions expressed herein do not necessarily reflect those of the European Commission.application/pdfen-AU© 2020 Author(s).202010.1063/5.00056092021-08-01