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JEM-EUSO用MgF$$_{2}$$光学薄膜の原子状酸素耐性について

Anti-atomic oxygen properties of MgF$$_{2}$$ optical coating for JEM-EUSO mission

田川 雅人*; 横田 久美子*; 太刀内 寛人*; 寺岡 有殿; 滝澤 慶之*

Tagawa, Masahito*; Yokota, Kumiko*; Tachiuchi, Hiroto*; Teraoka, Yuden; Takizawa, Yoshiyuki*

JEM-EUSO望遠鏡の第一対物レンズ向けの材料の候補に対する原子状酸素の影響を神戸大学のレーザーデトネーション原子状酸素照射装置を用いて評価した。PMMAの透過性は原子状酸素照射によって徐々に失われることが確認された。MgF$$_{2}$$反射防止コーティングも超熱エネルギーの原子状酸素照射による反応で酸化される。そのコーティングの不完全性のために、原子状酸素の増加とともに酸化が進行する。したがってPMMAとMgF$$_{2}$$の組合せはLEM-EUSO望遠鏡の第一対物レンズとしては推奨されない。

Effect of atomic oxygen on the candidate of lens materials for the first objective lens of JEM-EUSO telescope was evaluated by the laser detonation ground-based atomic oxygen exposure facility at Kobe University. It was confirmed that transparency of PMMA was gradually lost by the atomic oxygen exposure. MgF$$_{2}$$ anti-reflection coating was also oxidized by the reaction with hyperthermal atomic oxygen exposure. Due to its imperfection of the coating, oxidation of material may be continued with increasing the fluence. It was not recommended to use the combination of PMMA and MgF$$_{2}$$ on the first objective lens of LEM-EUSO telescope.

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