Preliminary results and analysis of a tangential TV Thomson scattering diagnostic system on EAST

This paper presents the latest development of a tangential TVTS (Television Thomson scattering) system on the EAST Tokamak and the preliminary results obtained recently. For the goals of the thousand-second H-mode on EAST, it is obviously essential for the experimental operation and physical research to develop a high spatial resolution edge Thomson scattering diagnostic system. The new system uses a tangential optical path, mainly covering plasma ρ = 0.8 – 1.1 region. A high energy 532 nm laser was designed as the light source, which can realize the stable output of 10 Hz/3.5 J in the time of a thousand seconds through the new optical structure technology. In order to improve the scattering light splitting efficiency, the transmission grating is used as the main splitting device. We use a three-step image enhancement amplification technique so that the detection efficiency of the system can reach 3000 counts/photon. At present, the spatial resolution of the system is about 3 mm, and the measurement electron temperature (T_e) range is 50 eV - 2 keV, the electron temperature error is expected <7 %.