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C. Tomastik, W.S.M. Werner, H. Störi:
"Interaction of Beryllium Oxide with Hydrogen Plasma";
Poster: 21st IAEA Fusion Energy Conference (FEC 2006), Chengdu/China; 16.10.2006 - 21.10.2006; in: "Book of Abstract, 21st IAEA Fusion Energy Conference", (2006), S. 191.

Beryllium is considered a candidate material for the first wall of nuclear fusion plasma devices, e.g. ITER. Therefore, the interaction of beryllium oxide with a D/T plasma is important with respect to beryllium as oxygen getter and the influence of beryllium oxide on the retention of D and T in the first wall. Since it is not yet fully clear if and how much oxide will develop during operation, we investigated the interaction of beryllium samples with hydrogen plasma. Exposure of beryllium samples with native oxide layers and pre-oxidized samples to hydrogen plasma resulted in an oxide layer of similar thickness, suggesting the development of an equilibrium state during exposure. In order to determine the relation between equilibrium oxide layer and oxygen concentration in the plasma, the samples were exposed to hydrogen plasma with various additions of water vapour. Oxygen content was monitored with an optical spectrometer. Further experiments will aim at the dependence of hydrogen retention on the oxide layer thickness.