Investigation of the optical performance of microchannel plate (MCP) collimators for the eXTP-LAD telescope

IF 1.5 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment Pub Date : 2024-11-09 DOI:10.1016/j.nima.2024.170059

Longhui Li , Tao Luo , Yupeng Xu , Jian Wang , Xiaoqing Cong , Huilin He , Xiaojing Liu , Hongwei Liu , Huan Zhang , Jiaqi Zhu , Mingzhao Ouyang , Yuegang Fu

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Abstract

The Enhanced X-ray Timing and Polarimetry mission (eXTP) represents a next-generation flagship satellite for X-ray astronomy. A critical component of eXTP is the Large Area Detector (LAD), which consists of 40 modules, each equipped with a set of 4 × 4 microchannel plate (MCP) collimators. The optical characteristics of the MCP are essential for the observational capabilities of the eXTP-LAD. In this study, we provide a detailed description of the point-to-point soft X-ray test equipment. The measurements of the point spread function (PSF) of the collimators reveal discrepancies when compared to theoretical predictions. Specifically, the full width at half maximums (FWHM) and angular resolution are larger than expected, primarily due to the channel errors. The simulation results are consistent with the measured results and demonstrate that channel errors and inner wall roughness significantly impact the optical performance of collimators.

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用于 eXTP-LAD 望远镜的微通道板 (MCP) 准直器光学性能研究

增强型 X 射线定时和测极飞行任务（eXTP）是下一代 X 射线天文学旗舰卫星。eXTP 的一个重要组成部分是大面积探测器（LAD），它由 40 个模块组成，每个模块配备一套 4 × 4 微通道板（MCP）准直器。MCP 的光学特性对 eXTP-LAD 的观测能力至关重要。在本研究中，我们将详细介绍点对点软 X 射线测试设备。准直器的点扩散函数（PSF）测量结果显示，与理论预测结果存在差异。具体来说，半最大值全宽（FWHM）和角度分辨率比预期的要大，这主要是由于通道误差造成的。模拟结果与测量结果一致，证明了通道误差和内壁粗糙度对准直器光学性能的重大影响。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment 物理-光谱学

CiteScore

3.20

自引率

21.40%

发文量

787

审稿时长

1 months

期刊介绍： Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.

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