Electron-Beam-Induced Discharge Phenomena of Teflon Films for Space Use

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  • 宇宙用熱制御テフロンフィルムの電子ビーム照射による放電現象とその解析
  • ウチュウヨウ ネツ セイギョ テフロン フィルム ノ デンシ ビーム ショウシ
  • Electron‐beam‐induced discharge phenomena of Teflon films for space use

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We investigated the discharge phenomena of Teflon FEP (fluorinated ethylene-propylene) films used as thermal control material of spacecraft by electron beam irradiation simulating hot plasma in space. FEP films of two kinds of thickness, 25μm and 127μm, were tested. The obtained experimental results were as follows.<br>(1) In 127μm thick FFP film, surface discharge triggered by high electric field at the triple junction of the edge of the metal frame occurred.<br>(2) In 25μm thick FEP film, punchthrough discharge accompanied with surface discharge occurred. <br>(3) Discharge frequency increased with the nearly 1/2 power of the electron-beam current density under the constant irradiation energy. On the other hand, it increased linearly with the irradiation energy under the constant beam current density. However, the threshold electron energy to cause the discharge existed.<br>These results were explained by comparison between the surface electric field and the bulk electric field in FEP film obtained analytically by using a two-dimensional charging model.

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