Medium-Energy Proton Detector Onboard the FY-4B Satellite
This work introduces the instrument design of the medium-energy proton detector (MEPD, detection range: 30 keV–5 MeV) mounted on the Chinese Fengyun-4B (FY-4B) satellite. Compared to a similar detector on the Fengyun-3E (FY-3E) satellite, this instrument has undergone significant changes due to the...
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| Format: | Article |
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MDPI AG
2023-10-01
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| Series: | Aerospace |
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| Online Access: | https://www.mdpi.com/2226-4310/10/10/889 |
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| author | Huanxin Zhang Shenyi Zhang Guohong Shen Xin Zhang Weiguo Zong Jianguang Guo Anqin Chen Liguo Zhang Ruyi Zhang |
| author_facet | Huanxin Zhang Shenyi Zhang Guohong Shen Xin Zhang Weiguo Zong Jianguang Guo Anqin Chen Liguo Zhang Ruyi Zhang |
| author_sort | Huanxin Zhang |
| collection | DOAJ |
| description | This work introduces the instrument design of the medium-energy proton detector (MEPD, detection range: 30 keV–5 MeV) mounted on the Chinese Fengyun-4B (FY-4B) satellite. Compared to a similar detector on the Fengyun-3E (FY-3E) satellite, this instrument has undergone significant changes due to the different orbital radiation environment and solar lighting conditions. Based on the calculation of the radiation model AP8, the geometrical factor is reduced to 0.002 cm<sup>2</sup>sr, while that of the MEPD on the FY-3E satellite is 0.005 cm<sup>2</sup>sr. Another difference is that the sensors in some directions are exposed to direct sunlight for 80 min every day on this orbit, depending on the attitude angle of the satellite, which is much worse than that on the FY-3E satellite. According to the calculation results of transmittance of photons through different materials, a 100 nm thickness nickel film is added in front of the sensors to eliminate light pollution completely. The test using a solar simulator shows that the measure is effective and the detector has no error count when the solar irradiance coefficient is 1.0. In addition, the Geant4 software is applied to simulate the particle transportation process under complete machine condition to check the contamination of electrons in the sensors in all directions after magnetic deflection. The data obtained in orbit show that the instrument works properly, and the data are in good agreement with the AP8 model. The observations of the MEPD on board the FY-4B satellite can provide important support for the safety of spacecraft and theoretical research related to space weather. |
| first_indexed | 2024-03-10T21:31:07Z |
| format | Article |
| id | doaj.art-3df1e44440774252b92b300866ec5c5d |
| institution | Directory Open Access Journal |
| issn | 2226-4310 |
| language | English |
| last_indexed | 2024-03-10T21:31:07Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Aerospace |
| spelling | doaj.art-3df1e44440774252b92b300866ec5c5d2023-11-19T15:17:32ZengMDPI AGAerospace2226-43102023-10-01101088910.3390/aerospace10100889Medium-Energy Proton Detector Onboard the FY-4B SatelliteHuanxin Zhang0Shenyi Zhang1Guohong Shen2Xin Zhang3Weiguo Zong4Jianguang Guo5Anqin Chen6Liguo Zhang7Ruyi Zhang8National Space Science Center, Chinese Academy of Sciences, Beijing 100190, ChinaNational Space Science Center, Chinese Academy of Sciences, Beijing 100190, ChinaNational Space Science Center, Chinese Academy of Sciences, Beijing 100190, ChinaNational Space Science Center, Chinese Academy of Sciences, Beijing 100190, ChinaKey Laboratory of Space Weather, National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaKey Laboratory of Space Weather, National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaKey Laboratory of Space Weather, National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, ChinaShanghai Institute of Satellite Engineering, Shanghai 201109, ChinaShanghai Institute of Satellite Engineering, Shanghai 201109, ChinaThis work introduces the instrument design of the medium-energy proton detector (MEPD, detection range: 30 keV–5 MeV) mounted on the Chinese Fengyun-4B (FY-4B) satellite. Compared to a similar detector on the Fengyun-3E (FY-3E) satellite, this instrument has undergone significant changes due to the different orbital radiation environment and solar lighting conditions. Based on the calculation of the radiation model AP8, the geometrical factor is reduced to 0.002 cm<sup>2</sup>sr, while that of the MEPD on the FY-3E satellite is 0.005 cm<sup>2</sup>sr. Another difference is that the sensors in some directions are exposed to direct sunlight for 80 min every day on this orbit, depending on the attitude angle of the satellite, which is much worse than that on the FY-3E satellite. According to the calculation results of transmittance of photons through different materials, a 100 nm thickness nickel film is added in front of the sensors to eliminate light pollution completely. The test using a solar simulator shows that the measure is effective and the detector has no error count when the solar irradiance coefficient is 1.0. In addition, the Geant4 software is applied to simulate the particle transportation process under complete machine condition to check the contamination of electrons in the sensors in all directions after magnetic deflection. The data obtained in orbit show that the instrument works properly, and the data are in good agreement with the AP8 model. The observations of the MEPD on board the FY-4B satellite can provide important support for the safety of spacecraft and theoretical research related to space weather.https://www.mdpi.com/2226-4310/10/10/889medium-energy protonspace environmentlight pollutionmagnetic deflectionGeant4 |
| spellingShingle | Huanxin Zhang Shenyi Zhang Guohong Shen Xin Zhang Weiguo Zong Jianguang Guo Anqin Chen Liguo Zhang Ruyi Zhang Medium-Energy Proton Detector Onboard the FY-4B Satellite Aerospace medium-energy proton space environment light pollution magnetic deflection Geant4 |
| title | Medium-Energy Proton Detector Onboard the FY-4B Satellite |
| title_full | Medium-Energy Proton Detector Onboard the FY-4B Satellite |
| title_fullStr | Medium-Energy Proton Detector Onboard the FY-4B Satellite |
| title_full_unstemmed | Medium-Energy Proton Detector Onboard the FY-4B Satellite |
| title_short | Medium-Energy Proton Detector Onboard the FY-4B Satellite |
| title_sort | medium energy proton detector onboard the fy 4b satellite |
| topic | medium-energy proton space environment light pollution magnetic deflection Geant4 |
| url | https://www.mdpi.com/2226-4310/10/10/889 |
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