Pre-flight calibration of the optics assembly for CATCH’s first pathfinder

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2025-05-08 DOI:10.1007/s10686-025-10001-3

Jingyu Xiao, Yiming Huang, Zijian Zhao, Yusa Wang, Qian-Qing Yin, Chen Zhang, Dongjie Hou, Yuxuan Zhu, Yifan Zhang, Donghua Zhao, Sheng Yang, Lingling Men, Ge Jin, Lian Tao, Shuang-Nan Zhang, Wen Chen, Yanfeng Dai, Min Gao, Huilin He, Guoli Huang, Zhengwei Li, Xiaojing Liu, Panping Li, Yajun Li, Ruican Ma, Liqiang Qi, Xiangyang Wen, Shaolin Xiong, Yibo Xu, Liyuan Xiong, Yong Yang, Juan Zhang, Aimei Zhang, Heng Zhou, Shujie Zhao, Kang Zhao, Qingchang Zhao

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引用次数: 0

Abstract

The first pathfinder of the CATCH mission, CATCH-1, was launched in June 2024. It is equipped with a light-weight, narrow-field optimized Lobster Eye X-ray Optics. By sacrificing a portion of the field of view to achieve a large effective area, the telescope’s sensitivity is enhanced. This paper presents the equipment and procedures employed for calibrating the optics assembly. A comprehensive on-ground calibration for the Lobster Eye X-ray Optics is conducted before its launch using multi-target X-ray sources and the pnCCD Color X-Ray Camera in the 100 m X-Ray Test Facility. The results are derived from calibration measurements taken before and after the mechanical testing and mainly include measurements of the focal length, point spread function, angular resolution, and the effective area for incident X-rays at 0.28 keV, 0.93 keV, 1.49 keV, 2.98 keV, and 4.51 keV. The results indicate that the mirror’s performance remains stable and no observable variation before and after the mechanical testing. At 0.93 keV, the mirror’s angular resolution is \(6.11^{\prime }\) (FWHM), and the effective area is 40.75 \(\textrm{cm}^{2}\), meeting the expected performance of CATCH-1 X-ray optics.

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CATCH的第一个探路者的光学组件的飞行前校准

CATCH任务的首个探路者，CATCH-1，于2024年6月发射。它配备了一个重量轻、窄视场优化的龙虾眼x射线光学系统。通过牺牲一部分视场来获得较大的有效面积，提高了望远镜的灵敏度。本文介绍了用于校准光学组件的设备和程序。龙虾眼x射线光学系统在发射前进行了全面的地面校准，使用多目标x射线源和100米x射线测试设施的pnCCD彩色x射线相机。结果来源于机械测试前后的校准测量，主要包括0.28 keV、0.93 keV、1.49 keV、2.98 keV和4.51 keV入射x射线的焦距、点扩展函数、角分辨率和有效面积的测量。结果表明，在力学试验前后，反射镜的性能保持稳定，无明显变化。在0.93 keV下，反射镜的角分辨率为\(6.11^{\prime }\) (FWHM)，有效面积为40.75 \(\textrm{cm}^{2}\)，满足CATCH-1 x射线光学系统的预期性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.