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Investigation of the dynamic charge transport behaviors under electron beam irradiation of advanced insulation materials for aerospace applications
  • +4
  • Guangyu Sun,
  • Xiong Yang,
  • Wen-Tong An,
  • Kun Huang,
  • Xiao-Gang Qin,
  • Bai-Peng Song,
  • Guan-Jun Zhang
Guangyu Sun
State Key Laboratory of Electrical Insulation and Power Equipment, Jiaotong University School of Electrical Engineering

Corresponding Author:[email protected]

Author Profile
Xiong Yang
State Key Laboratory of Electrical Insulation and Power Equipment, Jiaotong University School of Electrical Engineering
Wen-Tong An
State Key Laboratory of Electrical Insulation and Power Equipment, Jiaotong University School of Electrical Engineering
Kun Huang
State Key Laboratory of Electrical Insulation and Power Equipment, Jiaotong University School of Electrical Engineering, State Grid Jiangxi Electric Power Research Institute
Xiao-Gang Qin
Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics
Bai-Peng Song
State Key Laboratory of Electrical Insulation and Power Equipment, Jiaotong University School of Electrical Engineering
Guan-Jun Zhang
State Key Laboratory of Electrical Insulation and Power Equipment, Jiaotong University School of Electrical Engineering

Abstract

Aerospace dielectric components of orbital spacecrafts are frequently exposed to harsh space environment, where beam irradiation leads to persistent charging and discharging of these dielectric materials. Here the dynamic charge transport behaviors of advanced aerospace dielectrics under electron beam irradiation are investigated by combining the drift-diffusion electron-hole transport model and synthetic surface charging diagnostics. Based on the measured trap state distribution and surface conductivity, numerical simulation of typical aerospace dielectrics with a focus on the polyimide is performed. The simulation reveals the spatial-temporal evolution of microscopic quantities consisting of the current density, charge density, electric field distribution, in addition to the time evolution of macroscopic quantities namely the sample current, secondary emission yield (SEY) and surface potential. Factors affecting the dielectric charging process, including beam energy, beam current, material type, and sample thickness, are analyzed. Dedicated relation between the beam energy and final surface potential is determined, while the beam current is found to only affect the charging speed. The effects of material type on the charging process are due to a range of combined channels via different primary range, permittivity, surface resistivity, trap state distribution, electron affinity, etc. The observed trends of surface potential, sample current, and SEY in experiment are generally consistent with the model prediction, and possible explanations for the discrepancies are provided. In the end, implications of the obtained conclusions for the electrostatic discharges on aerospace dielectrics are discussed.
02 Jun 2024Submitted to TechRxiv
07 Jun 2024Published in TechRxiv