A geometric factor calculation method based on the isotropic flux assumption

ZHAO Xiao-Yun; WANG Huan-Yu; WU Feng; MENG Xiang-Cheng; MA Yu-Qian; LU Hong; WANG Hui; WANG Ping; LI Xin-Qiao; XU Yan-Bin; SHI Feng; JIANG Wen-Qi; AN Zhen-Hua; YU Xiao-Xia; LIU Han-Yi

doi:10.1088/1674-1137/37/12/126201

Chinese Physics C> 2013, Vol. 37> Issue(12) : 126201 DOI: 10.1088/1674-1137/37/12/126201

A geometric factor calculation method based on the isotropic flux assumption

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One of the instruments onboard the China Seismic Electromagnetic Satellite (CSES) is the Low Energy Particle Detector (LEPD). The primary objective of LEPD is to provide measurements of the fluxes, energy spectra and pitch angles of 100 keV to 10 MeV electrons and protons from 2 to 50 MeV in the Earth's magnetosphere. The geometric factor is one of the principle parameters of a detector, which converts the physical quantity-count rate to the particle quantity-flux. In this paper, we calculated the geometric factor of LEPD via computer modeling of an isotropic radiation environment. It was first demonstrated that the radiation intensity related should obey a cosine-law, then a general sampling method of generating this distribution via GPS of GEANT4 was explained. Furthermore, combined with flux normalization, a comparison of the geometric factor calculation of a set of 2-layer detectors with different shapes (cylinder, truncated cone and rectangle) was performed. Results show a generally good agreement between simulation and analytical calculations for the cylinder and truncated cone detectors, and the result of the rectangular one, for which there is no accurate analytical formula, is consistent with the previous simulated results by others. As a practical instance of the 2-layer rectangle detector, the geometric factor of LEPD is 10.336±0.036 m cm²·sr for 10 MeV proton and 8.211±0.032 m cm²·sr for 8 MeV electron.

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ZHAO Xiao-Yun, WANG Huan-Yu, WU Feng, MENG Xiang-Cheng, MA Yu-Qian, LU Hong, WANG Hui, WANG Ping, LI Xin-Qiao, XU Yan-Bin, SHI Feng, JIANG Wen-Qi, AN Zhen-Hua, YU Xiao-Xia and LIU Han-Yi. A geometric factor calculation method based on the isotropic flux assumption[J]. Chinese Physics C, 2013, 37(12): 126201. doi: 10.1088/1674-1137/37/12/126201

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Received: 2013-02-19
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

A geometric factor calculation method based on the isotropic flux assumption

Corresponding author: ZHAO Xiao-Yun,

Corresponding author: WANG Huan-Yu,

Received Date: 2013-02-19

Accepted Date: 2013-04-02

Available Online: 2013-12-05

Abstract: One of the instruments onboard the China Seismic Electromagnetic Satellite (CSES) is the Low Energy Particle Detector (LEPD). The primary objective of LEPD is to provide measurements of the fluxes, energy spectra and pitch angles of 100 keV to 10 MeV electrons and protons from 2 to 50 MeV in the Earth's magnetosphere. The geometric factor is one of the principle parameters of a detector, which converts the physical quantity-count rate to the particle quantity-flux. In this paper, we calculated the geometric factor of LEPD via computer modeling of an isotropic radiation environment. It was first demonstrated that the radiation intensity related should obey a cosine-law, then a general sampling method of generating this distribution via GPS of GEANT4 was explained. Furthermore, combined with flux normalization, a comparison of the geometric factor calculation of a set of 2-layer detectors with different shapes (cylinder, truncated cone and rectangle) was performed. Results show a generally good agreement between simulation and analytical calculations for the cylinder and truncated cone detectors, and the result of the rectangular one, for which there is no accurate analytical formula, is consistent with the previous simulated results by others. As a practical instance of the 2-layer rectangle detector, the geometric factor of LEPD is 10.336±0.036 m cm²·sr for 10 MeV proton and 8.211±0.032 m cm²·sr for 8 MeV electron.

A geometric factor calculation method based on the isotropic flux assumption

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通讯作者: 陈斌, bchen63@163.com

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