One-dimensional parallax-free position-sensitive detector for diffraction measurements based on a home-made thin THGEM
A large parallax-free gas diffraction meter based on a thinner-THGEM (thick gaseous electron multiplier) has been developed at the Beijing Synchrotron Radiation Facility (BSRF). A thinner-THGEM of thickness 200 µ m is adopted, which can be shaped into a curve to eliminate parallax-error effects. The detector is designed to have a 48 ° open angle positioned 20 cm from the powder samples. A front-end electronics board with 128 channels direct-current mode was adapted for the 8 keV BSRF beamline with 0.2 ns/100 ns stable duty cycle. Two powder samples, TiO2 and SnO2, were tested separately. The measured spectra with an angular resolution of 0.148 ± 0.081 ° are consistent with the data from the powder diffraction file. Combining the gas gain of the thinner-THGEM with the electronic circuit dynamic range, a very broad dynamic range of about 107 could be obtained.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Chen, S. Liu, H. Liu, Q. Zheng, Y. Wang, B. Huang, W. Dong, Y. Rong, Y. Jiao, X. Guan, Y. Wang, J. Li, M. Liu, J. Zhang, M. Tags: micropattern gaseous detectors thinner-THGEM X-ray diffraction BSRF research papers Source Type: research
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