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Qin X.-G.,Lanzhou University | Qin X.-G.,National Key Laboratory of Vacuum and Cryogenics Technology and Physics | He D.-Y.,Lanzhou University | He D.-Y.,National Key Laboratory of Vacuum and Cryogenics Technology and Physics | And 2 more authors.
Yuhang Xuebao/Journal of Astronautics | Year: 2010

Energetic protons with high fluence is a major reason causing internal dielectrics charging in interplanetary spacecraft, thus the proton induced internal charging problem of dielectrics is predicted based on radiation induced conductivity (RIC) model and particle transfer soft package GEANT4 in the paper. With GEANT4-RIC simulation, fluence and dose profiles along with depth in Kapton and Teflon under 10 MeV proton radiation are obtained, then these results is introduced into the RIC model consisting of current continuous equation, Poisson equation and charge trapped equation to solve internal charge and electric field distributions, and the latter is compared with insulation disruption field as a guideline for discharging or not. The simulations validate a common experimentation result that Kapton occurs discharge after radiated with the fluence of 3×1012/cm2 and Teflon does not give such a phenomena. It proves that above GEANT4-RIC method can be used to evaluate the proton induced dielectric charging and provides a basis to interplanetary proton induced internal charging problem. Source

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