Simulation of the in-flight background and performance of DRO/GTM

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发表日期：

2024年6月13日

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Chenwei Wang,
Juan Zhang,
Shijie Zheng,
Shaolin Xiong,
Zhenghua An,
Wenxi Peng,
Haisheng Zhao,
Xiaoyun Zhao,
Chao Zheng,
Peiyi Feng,
Ke Gong,
Dongya Guo,
Xinqiao Li,
Jiacong Liu,
Yaqing Liu,
Wenjun Tan,
Yue Wang,
Wangchen Xue,
Sheng Yang,
Dali Zhang,
Fan Zhang,
Yanqiu Zhang

摘要

As a new member of the high energy astronomical transient monitoring network, Gamma-ray Transient Monitor (GTM) is an all-sky monitor onboard the Distant Retrograde Orbit (DRO) mission which has been launched in March 2024. In this work, we investigate the space radiation environment of DRO, and study the in-flight background of GTM using GEANT4. The background count rate on each of the 5 GTP detectors of GTM is estimated to be about 800 $\sim $ $\sim$ 1000 counts/s in the energy range from 20 keV to 1 MeV after one-year operation on orbit. We find that there are two distinct spectral lines clearly visible in the background spectrum, i.e. the 59 keV emission line from the embedded calibration source $^{241}$ $^{241}$ Am and the 511 keV emission line induced by space radiations, which are suitable for the in-flight energy gain calibration. These results provide important reference for the development of payload, design of observation strategies, in-flight calibration of instrument and research of scientific objectives.