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arXiv · 2111.11610

Performance of a focal plane detector for soft X-ray imaging spectroscopy based on back-illuminated sCMOS

Can Chen·Yusa Wang·Yupeng Xu·Zijian Zhao·Hongyun Qiu·Dongjie Hou·Xiongtao Yang·Jia Ma·Yong Chen·Yang Zhao·Hua Liu·Xiaofan Zhao·Yuxuan Zhu
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Abstract

Spectroscopy focusing array (SFA) and Polarimetry focusing array (PFA) are the two major payloads of enhanced X-ray Timing and Polarimetry mission (eXTP). Nested Wolter-\RNum{1} X-ray mirror module is implemented in SFA and PFA to achive high effective area. When evaluating the properties of the mirror module, the alignment of the optical axis of the X-ray mirror module and a quasi-parallel X-ray beam is a prerequisite to ensure the accuracy of the results. Hence, to assist the alignment of the X-ray mirror module, an X-ray focal plane detector is designed based on the back-illuminated scientific Complementary Metal-Oxide-Semiconductor Transistor (sCMOS) sensor GSENSE6060BSI, one of the largest detection areas, is produced by \textit{Gpixel Inc}. Then the characteristics of readout noise, dark current, and split-pixel event properties of the detector are studied with the self-developed multi-target fluorescence X-ray source in a 100 m long X-ray test facility. The energy calibration is carried out with the single-pixel event and the energy non-linearity of the detector is also obtained. Eventually, the simulation of the eXTP mirror module based on the optical model is conducted and the alignment test of the Wolter-\RNum{1} X-ray mirror module designed for \textit{EP/FXT} (Einstein Probe/Follow-up X-ray Telescope) with "Burkert test" method is shown.

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Can Chen, Yusa Wang, Yupeng Xu, Zijian Zhao, Hongyun Qiu, Dongjie Hou, Xiongtao Yang, Jia Ma, Yong Chen, Yang Zhao, Hua Liu, Xiaofan Zhao, Yuxuan Zhu. 2021-11-23. Performance of a focal plane detector for soft X-ray imaging spectroscopy based on back-illuminated sCMOS. https://doi.org/10.1016/j.nima.2022.166465

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