Study on outgassing effect of electromagnetic radiation on aluminum film
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摘要: 为研究空间环境中通用航天器表面覆盖的热控层电磁辐照效应，采用粒子模拟(PIC)和蒙特卡罗(MC)模拟相结合方法，建立了真空环境下电磁辐照航天器热控材料模型，模拟了场致电子发射、次级电子倍增、释气雪崩电离的全过程，并讨论了释气密度对热防护材料表面产生释气电离现象的影响。通过对比不同释气密度下该过程产生的电子和离子情况，获得热防护材料表面释气产生雪崩电离的阈值。模拟结果表明，当铝膜表面气体密度较小时，由于材料表面释气碰撞电离概率偏低而不会发生雪崩电离；只有当释气密度超过阈值时，材料表面释气碰撞电离过程加强，材料表面发生雪崩电离生成等离子体，等离子体吸收电磁波能量，其离子和电子总能量提升，可能对金属铝膜材料造成损伤。Abstract: To study the electromagnetic radiation effect of the thermal control layer covering the surface of general spacecraft in the space environment, a model of electromagnetic wave irradiated metal aluminum film material was established. The PIC (Particle-in-Cell)-MCC (Monte Carlo collisions) method was adopted to numerically simulate the changes of positive ions and collision ionization electrons under different outgassing densities. The simulation results show that when the gas density on the surface of the aluminum film is small, avalanche ionization will not occur due to the low probability of outgassing collision ionization on the surface of the material. Only when the outgassing density exceeds the threshold, the outgassing collision ionization process on the material surface is strengthened, and avalanche ionization occurs on the surface of the material to generate plasma, which absorbs electromagnetic wave energy, and the total energy of its ions and electrons increases, which may cause damage to the metal aluminum film material.
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Key words:
- electromagnetic irradiation /
- PIC-MCC simulation /
- multipactor /
- outgassing /
- impact ionization
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图 1 电磁波辐照航天器热控材料释气电离过程示意图
Figure 1. Schematic diagram of the outgassing and ionization process of spacecraft thermal control materials irradiated by electromagnetic waves
图 2 不同氩原子密度时不同粒子的数量变化
Figure 2. Variation of the number of different particles at different argon atomic densities
图 3 不同氩原子密度时不同粒子的能量变化
Figure 3. Variation of the energy of different particles at different argon atomic densities
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