著者

藤井 治久

出版者

一般社団法人 日本真空学会

雑誌

Journal of the Vacuum Society of Japan (ISSN:18822398)

巻号頁・発行日

vol.56, no.12, pp.493-501, 2013 (Released:2013-12-27)

参考文献数

33

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It is well known that spacecrafts on orbits are charged up due to the interaction with space plasma and high energy charged particles. Those charging phenomena are categorized into two. One is “surface charging” and the other is “internal charging”. The surface charging involves absolute charging of the conductive satellite body and differential charging occurring on different surface materials on the satellite. On the other hand, the internal charging occurs on the insulating materials and/or electrically floating conductors installed inside the spacecraft body. When the level of the differential charging and/or internal charging reaches some threshold, ESD's (Electrostatic Discharges) will possibly occur. The author reviewed these ESD phenomena based on the ground experiments simulating space environments.

著者

廣 三壽 藤井 治久

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.117, no.8, pp.805-812, 1997-07-20 (Released:2008-07-15)

参考文献数

13

被引用文献数

2 4

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We investigated the electrostatic charging phenomena of polymer films used for the thermal control materials of spacecrafts by electron-beam irradiation simulating the hot plasma in space. Three kinds of polymer films, Teflon FEP (flurinated ethylene-propylene), Kapton PI (poly imide) and Mylar PET (poly ethylene telephthalate) of the thickness of 13-75μm, were tested under the irradiation conditions of the electron energy E lower than 50keV and the beam current density Jb lower than 1nA/cm2. The surface potentials Vs of the films were obtained as functions of E and Jb at the constant irradiation time.The obtained experimental results are as follows.(1) Vs increases with increase of Jb. When Vs∞Jbn is assumed, the n value is different during the films: n=1 for FEP film, n_??_0.5 for PI film and 0.5_??_n_??_0.8 for PET film.(2) In Vs-E characteristics, Vs has the peak at some electron energy which is dependent on the material and the thickness.These results were explained by an one-dimensional charging model in which one charge deposition layer is assumed to be formed in the bulk of the film and the volume resistivity and the secondary electron emission coefficient of the material are considered.