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A geometric factor calculation method based on the isotropic flux assumption

赵小芸 王焕玉 吴峰 孟祥承 马宇蒨 卢红 王辉 王平 李新乔 徐岩冰 石峰 蒋文奇 安正华 于晓霞 刘汉一

Chinese physics C, 2013-12, Vol.37 (12), p.78-83 [Periódico revisado por pares]

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  • Título:
    A geometric factor calculation method based on the isotropic flux assumption
  • Autor: 赵小芸 王焕玉 吴峰 孟祥承 马宇蒨 卢红 王辉 王平 李新乔 徐岩冰 石峰 蒋文奇 安正华 于晓霞 刘汉一
  • Assuntos: Angles (geometry) ; Computer simulation ; Cylinders ; Detectors ; Flux ; GEANT4 ; Mathematical analysis ; Mathematical models ; Rectangles ; 几何因子 ; 几何系数 ; 各向同性 ; 地球磁层 ; 粒子探测器 ; 计算机模型 ; 通量
  • É parte de: Chinese physics C, 2013-12, Vol.37 (12), p.78-83
  • Notas: 11-5641/O4
    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.
    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（ 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 2 Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China）
    LEPD, geometric factor, isotropy, GEANT4, cosine distribution, flux normalization
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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.
  • Idioma: Inglês
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