The Advanced Space-based Solar Observatory (ASO-S) was successfully sent to space from Jiuquan Launch center on Oct. 9, 2022. The ASO-S is dedicated to study solar flares, corneal mass eruptions and their connections with solar magnetic field and configured three instruments: a Full-disk solar vector MagnetoGraph (FMG), a Lyman-alpha Solar Telescope (LST), and a solar Hard X-ray Imager (HXI). Until Dec. 2023, the ASO-S has smoothly operated at 720 kilometers above Earth’s surface in a Sun-synchronous orbit for one more year. The HXI is one of the three key parts in this mission and adopts a spatial modulation technique to indirectly achieve image of solar hard X-rays. It is made up of a collimator, a spectrometer and an electrical control box. As the critical component, the collimator is responsible for incident X-ray modulation. This paper presents detailed design of HXI, especially the core part -- collimator. Secondly, ground tests, including characterization and spatial environmental tests of HXI collimator will be reported accounted for its indirect imaging principle. We will put forward some newly on-orbit results in the past one year. All design and test result as well as on orbit performance verifies that this equipment fully completed its expected goal and even presents a more wonderful status over expectations.
ASO-S is a mission proposed for the 25th solar maximum by the Chinese solar community. The scientific objectives are to study the relationships among solar magnetic field, solar flares, and coronal mass ejections (CMEs). ASO-S consists of three payloads: Full-disk Magnetograph (FMG), Lyman-alpha Solar Telescope (LST), and Hard X-ray Imager (HXI), to measure solar magnetic field, to observe CMEs and solar flares, respectively. ASO-S is now under the phase-B studies. This paper makes a brief introduction to the mission.
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