Detector performance of the Gamma-ray Transient Monitor onboard DRO-A satellite

IF 6.4 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Science China Physics, Mechanics & Astronomy Pub Date : 2024-09-03 DOI:10.1007/s11433-024-2458-9

Pei-Yi Feng, Zheng-Hua An, Da-Li Zhang, Chen-Wei Wang, Chao Zheng, Sheng Yang, Shao-Lin Xiong, Jia-Cong Liu, Xin-Qiao Li, Ke Gong, Xiao-Jing Liu, Min Gao, Xiang-Yang Wen, Ya-Qing Liu, Xiao-Yun Zhao, Fan Zhang, Xi-Lei Sun, Hong Lu

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Abstract

The Gamma-ray Transient Monitor (GTM) is an all-sky monitor onboard the Distant Retrograde Orbit-A (DRO-A) satellite with the scientific objective of detecting gamma-ray transients ranging from 20 keV to 1 MeV. The GTM was equipped with five Gamma-ray Transient Probe (GTP) detector modules utilizing a NaI(Tl) scintillator coupled with a SiPM array. To reduce the SiPM noise, GTP uses a dedicated dual-channel coincident readout design. In this work, we first studied the impact of different coincidence times on the detection efficiency and ultimately selected a 0.5 µs time coincidence window for offline data processing. To test the performance of the GTPs and validate the Monte-Carlo-simulated energy response, we conducted comprehensive ground calibration tests using the Hard X-ray Calibration Facility (HXCF) and radioactive sources, including the energy response, detection efficiency, spatial response, bias-voltage response, and temperature dependence. We extensively present the ground calibration results and validate the design and mass model of the GTP detector, thus providing the foundation for in-flight observations and scientific data analysis.

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DRO-A 卫星上伽马射线瞬变监测器的探测器性能

伽马射线瞬变监测器（GTM）是远距离逆向轨道-A（DRO-A）卫星上的一个全天空监测器，其科学目标是探测从 20 keV 到 1 MeV 的伽马射线瞬变。伽马射线瞬变监测器配备了五个伽马射线瞬变探针（GTP）探测器模块，这些模块利用一个与 SiPM 阵列耦合的 NaI（Tl）闪烁体。为了降低 SiPM 噪声，GTP 采用了专用的双通道重合读出设计。在这项工作中，我们首先研究了不同重合时间对探测效率的影响，并最终选择了 0.5 µs 的重合时间窗口进行离线数据处理。为了测试 GTP 的性能并验证蒙特卡洛模拟的能量响应，我们利用硬 X 射线校准设施（HXCF）和放射源进行了全面的地面校准测试，包括能量响应、探测效率、空间响应、偏压响应和温度依赖性。我们广泛介绍了地面校准结果，并验证了 GTP 探测器的设计和质量模型，从而为飞行观测和科学数据分析奠定了基础。

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来源期刊

Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-

CiteScore

10.30

自引率

6.20%

发文量

4047

审稿时长

3 months

期刊介绍： Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.