Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Medium Energy Proton Detector Onboard FY-4B Satellite

HuanXin Zhang
* ORCID logo ,
GuoHong Shen
ORCID logo ,
ShenYi Zhang
,
WeiGuo Zong
,
JianGuang Guo
,
AnQin Chen
,
Xin Zhang
,
Bo Su
,
Ping Zhou
,
WenTao Ji
Version 1 : Received: 29 August 2023 / Approved: 29 August 2023 / Online: 30 August 2023 (14:07:47 CEST)

A peer-reviewed article of this Preprint also exists.

Zhang, H.; Zhang, S.; Shen, G.; Zhang, X.; Zong, W.; Guo, J.; Chen, A.; Zhang, L.; Zhang, R. Medium-Energy Proton Detector Onboard the FY-4B Satellite. Aerospace 2023, 10, 889. Zhang, H.; Zhang, S.; Shen, G.; Zhang, X.; Zong, W.; Guo, J.; Chen, A.; Zhang, L.; Zhang, R. Medium-Energy Proton Detector Onboard the FY-4B Satellite. Aerospace 2023, 10, 889.

Abstract

: This work introduces the instrument design of the medium energy proton detector (MEPD, detection range: 30keV-5MeV) mounted on the Chinese Fengyun-4B (FY-4B) satellite. Compared with the similar detector on the Fengyun-3E (FY-3E) satellite, the instrument has undergone significant changes due to the different orbital radiation environment and solar lighting conditions. Based on the calculation of radiation model AP8, the geometry factor is reduced to 0.002 cm2sr, while the MEPD on FY-3E satellite is 0.005 cm2sr. Another difference is that sensors in some directions is exposed to direct sunlight for 80 minutes every day on this orbit, depending on the attitude angle of the satellite, which is much worse than that on FY-3E satellite. According to the calculation results of permeability of photons through different materials, a 100 nm thickness nickel film is added in front of sensors in order to eliminate light pollution completely. The experiment on the solar simulator shows that the measure is effective and the detector has no error counts when the solar irradiance coefficient is 1.0. In addition, Geant4 software is applied to simulate particle transportation process under complete machine condition so that to check the contamination of electrons on sensors among all directions after magnetic deflection. Data obtained in orbit shows that the instrument works properly, and the data is 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 the spacecraft and the theoretical research related to space weather.

Keywords

medium energy proton; space environment; light pollution; magnetic deflection; Geant4

Subject

Engineering, Aerospace Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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