Measurement system of multipoint Thomson scattering on HL-2A Tokamak

The measurement of plasma electron temperature and density in the HL-2A Tokamak using a YAG laser multipoint Thomson scattering system is described. In this system, a standard lamp-monochromator combination is utilized for the calibration of spectral responses. The experimental results of the 6-point electron temperatures and densities around the plasma center are presented during different discharges of plasma with a time resolution of 100 ms and a spatial resolution of 2.2 cm. The total measurement uncertainty of electron temperature are estimated to be ±12%. And the system spatial range of electron temperature measurement is -35 ~ -3 cm.