Study of Deep Electric Field Distortion Characteristics in Spacecraft Polyimide under Mixed Electron-Proton Radiation

WU Jiang; DANG Xuyao; CUI Pengfei; DANG Menghang; SHANG Penghui; CAO Wen

doi:10.7652/xjtuxb202606006

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Study of Deep Electric Field Distortion Characteristics in Spacecraft Polyimide under Mixed Electron-Proton Radiation

Special Topic Polyimide Radiation Effects Study | 更新时间：2026-06-12

- Study of Deep Electric Field Distortion Characteristics in Spacecraft Polyimide under Mixed Electron-Proton Radiation
- Journal of Xi'an Jiaotong University Vol. 60, Issue 6, Pages: 75-85(2026)
- 作者机构：
  
  西安工程大学电子信息学院，710048，西安
  电子科技大学长三角研究院（湖州），313000，浙江湖州
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202606006
  CLC： TM215.1
- Received：28 July 2025，
  
  Published：10 June 2026
- 稿件说明：
移动端阅览
WU Jiang, DANG Xuyao, CUI Pengfei, et al. Study of Deep Electric Field Distortion Characteristics in Spacecraft Polyimide under Mixed Electron-Proton Radiation[J]. Journal of Xi'an Jiaotong University, 2026, 60(6): 75-85.
DOI：

WU Jiang, DANG Xuyao, CUI Pengfei, et al. Study of Deep Electric Field Distortion Characteristics in Spacecraft Polyimide under Mixed Electron-Proton Radiation[J]. Journal of Xi'an Jiaotong University, 2026, 60(6): 75-85. DOI： 10.7652/xjtuxb202606006.

摘要

为了评估复杂空间环境下航天器介质深层充电水平，对高能电子与质子混合辐射下介质深层电场分布进行数值计算研究。基于蒙特卡罗的粒子辐射方法和电场有限元数值计算方法，提出了一种双带电粒子混合辐射的GEANT4-COMSOL联合充电评估方法，针对航天器聚酰亚胺介质建立了厚度4mm的平板模型，并考虑了入射带电粒子在介质中的电荷沉积量、能量沉积分布以及介质中的非线性暗电导和辐射诱导电导。通过联合充电评估方法，分别计算了聚酰亚胺介质在5组不同能量组合的单能电子和单能质子混合辐射下电位分布与电场强度分布，以及在太阳同步轨道中南极、北纬45°、赤道3个典型位置的能谱电子和质子混合条件下的电场畸变特性。研究结果表明：当不同能量单能电子和质子混合辐射时，电子和质子因电荷沉积深度分布存在差异，电场均呈现“双峰型”分布；在太阳同步轨道下能谱电子和质子混合辐射时，3个典型位置的最大电场强度分别为0.372、0.196、0.210 MV·m

-1

，在南极区域介质内电场强度最高。电子与质子混合辐射的电场分布结果表明，两种电荷所引发的介质内电场畸变特性，即电场增强或削弱，在辐射深度上存在复杂的分布特性，并在特定辐射与纬度条件下会达到严重的充电危害水平。

Abstract

To evaluate the deep charging level of spacecraft dielectrics in complex space radiation environments，numerical calculations of deep electric field distributions in the dielectric under mixed radiation of high-energy electrons and protons were performed.A GEANT4-COMSOL coupled charging evaluation method was proposed by combining Monte Carlo particle radiation and numerical simulation of electric field using FEM.A 4 mm-thick slab model for spacecraft polyimide was established，and charge deposition，energy-deposition distributions of incident charged particles in the dielectric，as well as nonlinear dark conductivity and radiation-induced conductivity in the dielectric were taken into account.Using the coupled charging evaluation method，distributions of potential and electric field intensity were calculated for polyimide dielectric exposed to mixed radiation of mon

oenergetic electrons and protons in five different energy-combination sets.Furthermore，electric field distortion characteristics were evaluated under mixed radiation of electrons and protons with energy spectrum at three typical locations in the sun-synchronous orbit（i.e.，the Antarctic region，45°N，and the equator）.The study results indicate that，under mixed radiation of monoenergetic electrons and protons in different energy sets，differences in charge deposition depth between electrons and protons produce a“double-peaked”electric field profile；under mixed radiation of electrons and protons with energy spectrum in sun-synchronous orbit，the maximum electric field intensities at the three typical locations were 0.372，0.196，and 0.210 MV·m

-1

，respectively，with the Antarctic region exhibiting the highest electric field intensity in the dielectric.The electric field distributions under mixed irradiation of electrons and protons demonstrate that the electric field distortion characteristics in the dielectric induced by the two charge species-manifesting as either enhancement or attenuation-are characterized by complex radiation depth-dependent distributions，and that，under specific radiation and latitudinal conditions，the resulting dielectric charging may reach levels that pose serious hazard risks.

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