プロトン照射されたポリイミドフィルムにおける帯電現象

Spacecraft sometimes have a serious damage due to the electro static discharge accident. It is said that the charge accumulation in dielectric materials on spacecraft irradiated by high energy charged particles in space environment causes the discharge accident. Therefore, we need to investigate the charge accumulation characteristics in the bulk of dielectric materials. We have been developing a system for measuring internal charge distribution in dielectric materials using Pulsed Electro-Acoustic (PEA) method. Using the system, we tried to measure the charge distribution after proton beam irradiated polyimide (PI) film, which has been used as a thermal control layer of spacecraft. From the result, it is found that positive charge accumulates in PI film rapidly up to a certain saturated value, then it gradually decreases during the proton beam irradiation. As the reason for the phenomenon, we consider the RIC (Radiation Induced Conductivity) by proton beam. In this paper, we show the typical charge distribution under proton beam irradiation and the conductivity in PI irradiated by proton beam. As the result, it is found that the relationship of decrease processes in amount of positive charge and RIC.
Physical characteristics: Original contains color illustrations
Meeting Information: 8th Spacecraft Enivironment Symposium (October 18-19, 2011, Tokyo Big Sight), Tokyo Japan
形態: カラー図版あり
会議情報: 第8回宇宙環境シンポジウム (2011年10月18-19日. 東京国際展示場), 東京