Abstract
We evaluate the dielectric characteristic of polymeric materials for MLI (Multi Layer Insulator, a kind of thermal insulation material) for spacecraft under high energy proton irradiation using results of space charge distribution. Spacecrafts have a serious damage due to the electro-static discharge accident. The electric charges are accumulated in the polymeric materials due to radioactive rays, especially electrons and protons. The charge accumulation is the origin of aging and discharging phenomena, furthermore those become trigger for spacecraft operation anomaly. Therefore, we need to obtain the space charge distribution in the bulks. In this study, we especially focused polyimide films for MLI irradiated by high energy proton. We measured the space charge distribution in the bulks during and after proton beam irradiation. From the results, it is found that positive charges accumulate in the bulk at the position of proton penetration depth. We also obtained same tendency from the results of conductivity measurement treated by ASTM method. From the above reason, we have studied the dielectric characteristics of MLI materials irradiated by radioactive rays, especially we focused the condition of proton irradiation. In this paper, we discuss the dielectric phenomena and the relationship between conductivity and charge accumulation in bulks.
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References
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Acknowledgments
This research was partly supported by a Grant-in-Aid for Young Scientists (20760208) from The Ministry of Education, Culture, Sports, Science and Technology, Japan. And also, Japan Atomic Energy Agency (JAEA) provided the proton irradiation facility used for this research work by the facility share program. And Dr. Takeo Iwai provided high fluence irradiation facility, the University of Tokyo.
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Uchiyama, R., Miyake, H., Tanaka, Y., Takada, T. (2013). Charging and Discharging Characteristic on PI Films Irradiated by Protons. In: Kleiman, J., Tagawa, M., Kimoto, Y. (eds) Protection of Materials and Structures From the Space Environment. Astrophysics and Space Science Proceedings, vol 32. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30229-9_42
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DOI: https://doi.org/10.1007/978-3-642-30229-9_42
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