Discussion on the geometric factor in the detection of high energy electrons in geospace  

作　　者：CHEN HongFei SHI WeiHong ZOU Hong ZOU JiQing 

机构地区：[1]Institute of Space Physics and Applied Technology,School of Earth and Space Sciences,Peking University,Beijing 100871,China

出　　处：《Science China(Technological Sciences)》2008年第1期1-9,共9页中国科学（技术科学英文版）

基　　金：the National Natural Science Foundation of China (Grant No. 40674097) ;Co-constructing Foundation of Beijing Municipal Commission of Education (Grant No. XK100010404)

摘　　要：High energy electron is a kind of sources to be detected in the geospace environ- ment. Generally, the particle telescope with much thick semiconductor detector is used as the sensor for energetic electrons because they can penetrate deeply into the detector. The more energy of the electrons is, the deeper they can penetrate into, so that the geometric factor varies with energy of the incident electrons. We discuss the geometric factor of particle radiation detector (PRD), which is a payload on ZY-1 (CBERS-1 and CBERS-2) satellites to monitor the high energy particle ra- diation inside the satellites. According to the NASA’s AE8 model, the geometric factors of electrons for the low energy bin (0.5―1.0 MeV) and the high energy bin (> 2.0 MeV) are 2.468 and 1.736 cm2·sr, respectively. These results are much differ- ent from the traditional calculation of the geometric factor that is 1.18 cm2·sr. The angle-response function of the telescope is also derived, which can be useful for design of the telescope and analysis of the directional distribution.High energy electron is a kind of sources to be detected in the geospace environment. Generally, the particle telescope with much thick semiconductor detector is used as the sensor for energetic electrons because they can penetrate deeply into the detector. The more energy of the electrons is, the deeper they can penetrate into, so that the geometric factor varies with energy of the incident electrons. We discuss the geometric factor of particle radiation detector (PRD), which is a payload on ZY-1 (CBERS-1 and CBERS-2) satellites to monitor the high energy particle radiation inside the satellites. According to the NASA’s AE8 model, the geometric factors of electrons for the low energy bin (0.5–1.0 MeV) and the high energy bin (> 2.0 MeV) are 2.468 and 1.736 cm2·sr, respectively. These results are much different from the traditional calculation of the geometric factor that is 1.18 cm2·sr. The angle-response function of the telescope is also derived, which can be useful for design of the telescope and analysis of the directional distribution.

关 键 词：GEOMETRIC FACTOR high energy ELECTRONS PARTICLE radiation space EXPLORATION 

分 类 号：TH742[机械工程—光学工程]