The Calibration Research Of Space X-ray Detectors

The ground calibration of astronomical satellite payloads plays a fundamental and important role in astronomical mission,and it guarantees that the satellites can work well.Only in this way,can the physical parameters such as energy linearity,energy resolution,detection efficiency and uniformity of detectors be determined,and so as to operate effective data analysis of astronomical observation.This research has mainly done the following work.Firstly,it is using the standard radioactive source to calibrate standard detector,and so the energy response and detection efficiency of it are obtained.Secondly,it is the realization of monoenergetic X-rays and the research of ground calibration facility: K-Fluorescence device utilizes the characteristic radiation principle to realize 8 monoenergetic X-ray points between(15.8?75)ke V,and analyzing the stability of K-Fluorescence device,its overall stability is better than 0.08%;single-crystal calibration facility achieves(21?301)ke V continuously adjustable monoenergetic X-rays,and it has the highest energy in the world;the double-crystal calibration facility achieves(20.5 ?196.5)ke V continuously adjustable monoenergetic X-rays,and its overall stability is better than 0.56%.After the calibration facility was established and restored,research focuses on the preliminary ground calibration of the partial payloads of the GECAM astronomical satellite,the SVOM satellite and the ASO-S satellite.Preliminary calibration of the GECAM payload GRD and preliminary calibration of the SVOM payload GRM were performed.Lastly,this paper focuses on the preliminary calibration research of the ASO-S satellite payload HXI.The energy linearity,detection efficiency and positional uniformity of three La Br3 detectors of HXI are studied.The uniformity of the probe No.6 is 0.41%,No.7 is 0.75%,and No.9 is 0.14%.