Design and verification of the HXI collimator onboard the ASO-S mission.

A space borne hard X-ray collimator, consists of 91 pairs of grids, has been developed for the Hard X-ray Imager (HXI). The HXI is one of the three scientific instruments onboard the first Chinese solar mission: the Advanced Space-based Solar Observatory (ASO-S). The HXI collimator (HXI-C) is a spatial modulation X-ray telescope focus on the hard X-rays emitted from energetic electrons in solar flares. In this paper, detailed design of the HXI-C is introduced for the qualification model which will be inherited by the flight model. Series tests on the HXI-C qualification model are reported to verify its capability to survive the launch and to operate normally in on-orbit environments. Further, results of the X-ray beam test for the HXI-C is present to indirectly identify its working performance.