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.