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arXiv · 2204.11649

Pre-launch characterization of the spectrometer of Hard X-ray Imager (HXI) onboard the ASO-S mission

W. Liu·Z. Zhang·J. Wu·T. Ma·Y. Zhang·Y. M. Hu·Y. Q. Zhang·Y. Y. Huang·H. X. Wang·X. K. Jiang·D. Y. Chen
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Abstract

As one of the three payloads of the Advanced Space-based Solar Observatory (ASO-S), the pre-launch characterization of HXI includes the characterization of the collimator and the spectrometer. This article focuses on the pre-launch characterization of HXI's spectrometer, including detection efficiency, energy resolution, and energy to ADC channel (E-C) relationship. The detection efficiency characterization necessitates a sufficient number of calibrated energy points in the HXI observation energy range, with a refined measurement around the absorption edge of the lanthanum bromide crystal, and is calibrated with an X-ray beam. The characterization results are consistent with the simulations and show that the detection efficiency difference between detector modules is controlled within $\pm3\%$. Radioactive sources $^{133}\textrm{Ba}$ and $^{137}\textrm{Cs}$ are used to calibrate the energy resolution and E-C relationship. The characterization results show that all detector modules' energy resolutions are better than $26\%$ at 32 keV, meeting the design specification. And their E-C relationships vary regularly with voltage. All of the characterization results indicate that the flight model of the HXI spectrometer meets the performance requirements and is capable of performing on-orbit observation activities.

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W. Liu, Z. Zhang, J. Wu, T. Ma, Y. Zhang, Y. M. Hu, Y. Q. Zhang, Y. Y. Huang, H. X. Wang, X. K. Jiang, D. Y. Chen. 2022-04-25. Pre-launch characterization of the spectrometer of Hard X-ray Imager (HXI) onboard the ASO-S mission. https://doi.org/10.1088/1748-0221/17/05/p05045

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