Polyimide film can be used in spacecraft thermal control multilayer and large-scale deployment structure, and its mechanical properties will be degraded by space radiation environments such as electron and proton. In this paper, the mechanical properties of polyimide film under the synergistic effect of electron and proton was studied using the space integrated irradiation test facility in Beijing Institute of Spacecraft Environment Engineering. It is found that the combined irradiation of electron and proton damages the polyimide film more than the single environment of electron or proton. The synergistic effect of electron and proton causes the exponentially decrease of rupture elongation and the tensile strength of the polyimide film with. With the increase of the electron and proton irradiation fluence until its properties reaches a steady state.
Laser technology and laser system has more and more important implication in spacecraft engineering. But different from ground environments, space environments include vacuum, extreme temperature and thermal cycling, space radiation environment such as electron, proton, heavy ions, ultraviolet, contamination, and so on. Space environments may have damage or threaten to the space laser system, especially to their optical devices. So the influence of space environments on the laser damage of space laser system should be studied. In this paper, space environments of space laser system encountered is introduced firstly, and then the influence of space environment on space laser system is discussed. Thirdly, the damage mechanism of space environment on laser damage is analyzed. At last, some works or countermeasures were proposed to improve the laser radiation damage threshold of laser system in space environments.
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