Characterization of the eXTP-LAD collimators

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

Experimental Astronomy Pub Date : 2024-06-14 DOI:10.1007/s10686-024-09947-7

Zijian Zhao, Tao Luo, Francesco Ceraudo, Marco Feroci, Longhui Li, Jian Wang, Yupeng Xu, Hongwei Liu, Yuxuan Zhu, Yifan Zhang, Dongjie Hou, Xiongtao Yang, Huilin He, Shuang-Nan Zhang, Fangjun Lu, Yusa Wang

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Abstract

The enhanced X-ray Timing and Polarimetry mission (eXTP) is a next-generation flagship X-ray astronomy satellite currently in phase-B study. The large Area Detector (LAD) on board eXTP contains 40 modules, each consisting of a set of 4\(\times \)4 large area SDDs and 4\(\times \)4 collimators, and has a designed effective area of 3.0 m\(^2\) at 8 keV and a Field of View (FoV) of 1\(^\circ \). To achieve such a large effective area, the collimator’s Open Area Ratio (OAR) should be greater than 70%. In this paper, we introduce the measurement methods used to determine the OAR and the rocking curve (angular response) of the LAD collimator at the 100-m X-ray Test Facility (100XF) of the Institute of High Energy Physics (IHEP) in Beijing, and report the results of the collimators manufactured under different conditions. The measured OARs of the collimators are usually smaller than the theoretical values by a few percent, which is due to the non-uniformity and irregularity of the pores. The measured rocking curves are usually broader than the theoretical triangular curves, and the lower the energy of the incident X-ray the broader the rocking curve. This broadening of the rocking curve is the result of reflection on the inner wall of the pores. Our results also show that increasing the etching time in the manufacturing of the collimators can increase the OARs but does not change significantly the shape of the rocking curves.

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eXTP-LAD 准直器的特性分析

增强型 X 射线定时和测极飞行任务（eXTP）是下一代旗舰 X 射线天文卫星，目前正处于 B 阶段研究中。eXTP上的大面积探测器（LAD）包含40个模块，每个模块由一组4（\times \）4个大面积SDD和4（\times \）4个准直器组成，在8 keV时的设计有效面积为3.0 m\(^2\) ，视场（FoV）为1（^\circ \）。要实现如此大的有效面积，准直器的开阔面积比（OAR）应大于 70%。本文介绍了北京高能物理研究所（IHEP）100 米 X 射线测试设备（100XF）用于测定 LAD 准直器的开区比（OAR）和摇摆曲线（角响应）的测量方法，并报告了在不同条件下制造的准直器的测量结果。由于孔隙的不均匀性和不规则性，准直器的实测 OAR 通常比理论值小几个百分点。测得的摇摆曲线通常比理论三角形曲线宽，入射 X 射线的能量越低，摇摆曲线越宽。这种摇摆曲线的变宽是孔隙内壁反射的结果。我们的研究结果还表明，在准直器制造过程中增加蚀刻时间可以增加 OAR，但不会显著改变摇摆曲线的形状。

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.