Primary results of measuring plasma electron temperature with YAG laser Thomson scattering system on the HL-2A Tokamak

This article describes the laser Thomson scattering principle and the developed system on HL-2A device. The high power Q-switch Nd:YAG laser, with a wavelength of 1 064 nm, can sufficiently satisfy the measurement requirement. The polycromator consisting of avalanche photo-diodes(APD) and narrow band interference filters, can effectively improve the measurement of scattering light. The electron temperature is deduced by error-weighted lookup table method, which improves the data-processing speed or efficiency. Finally, the experiment results of the one-point electron temperature during different discharges of plasma are presented.