Charge Accumulation Characteristics of Fluorine Insulating Materials under Electron Beam Irradiation

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<p>Insulating materials are frequently used in spacecraft, especially as thermal blanket which are protecting the electronic devices from a drastic temperature change in space environment. While such insulating materials are working well to keep temperature stable, the electron beam is once irradiated to the materials, they are charged up and a large electric potential difference generates between the charged and uncharged surfaces. If the difference in potential becomes very large, a discharge sometimes occurs between them. Such discharge is very harmful for the spacecraft. Therefore, their behavior in relation to an electron beam irradiation due to space environment must be clearly elucidate at designing stage of spacecraft. In this paper, we focused on the charge accumulation in the materials under an irradiation of high energy electron beam. In the experiments, some fluorine materials, which are ordinary used for the spacecraft, are chosen. Judging from the measurement results, it was found that the amounts of accumulated electrons gradually decreased during an electron beam irradiation. Therefore, we tried to explain the phenomenon with considering an idea of RIC (Radiation Induced Conductivity).</p>

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