Calculation for the Space Environment Background of HXMT |
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Authors: | Gang Li Mei Wu Shu Zhang Ying-Kang Jin |
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Institution: | aKey Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049;bGraduate School of Chinese Academy of Sciences, Beijing 100039;cDepartment of Engineering Physics and Center for Astrophysics, Tsinghua University, Beijing 100084 |
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Abstract: | The Hard X-ray Modulation Telescope (HXMT) is a broadband X-ray (1 250 keV) astronomical satellite. Its core payload, the High Energy X-ray Telescope (hereafter HE), is operated in the hard X-ray energy range (20 250 keV) and dedicated to the hard X-ray high-sensitivity survey observation, hard X-ray sky mapping and high-sensitivity focused observations towards particular celestial bodies. In order to achieve a high sensitivity, it is important to reduce effectively the background that is caused by the interactions between the detector and space particles (γ-ray, protons, electrons, neutrons). Combining a series of references about the near-earth space background with the up-to-date observational data, this paper presents a set of self-consistent data and energy spectrum formulae of near-earth space particles for the convenience of applications. In addition, by the simulative calculations with the software Geant 4, the background of HXMT and its variations with the time and orbit are also given. |
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Keywords: | X-rays diffuse background |
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