Speaker
Dr
Yuan Huang
(Southwestern Institute of Physics)
Description
In recent two years, some efforts have been made to promote the performance of incoherent Thomson scattering (TS) diagnostic on HL-2A tokamak. Step motors are used to adjust the reflecting mirrors and focusing lens of the input laser beam optics, by which it is easy to control the laser beam pass through the narrow throats of the lower and upper closed divertors. Spectral calibration has been refined. Hardware of Si-APD detector electronics is improved, which provides two output signal channels. In one channel, only the fast TS signal is output after deducting the influence of plasma light. In the other, both the fast TS signal and the background signal of slow-varying plasma light are output. In this 2017 experiment campaign, the new developed electronics are tested and TS signals can be obtained from the two channels, which are digitized by 1GS-12bit transient recorders. In data processing, the TS pulse shape is fitted with different functions output from the two different channels. The statistical estimation of Te data is also optimized. More channels of fast digitizers and more positions of Te and ne measurement are planned and are in constructions.
Primary author
Dr
Yuan Huang
(Southwestern Institute of Physics)
Co-authors
Dr
C.H. Liu
(Southwestern Institute of Physics)
Ms
Y.Q. Wang
(Southwestern Institute of Physics)
Ms
Z.P. Hou
(Southwestern Institute of Physics)
Dr
Zhen Feng
(Southwestern Institute of Physics)
