Ion irradiated graphite exposed to fusion-relevant deuterium plasma

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Graphite samples were irradiated with 5 MeV carbon ions to simulate the damage caused by collision cascades from neutron irradiation in a fusion environment. The ion irradiated graphite samples were then exposed to a deuterium plasma in the linear plasma device, MAGPIE, for a total ion fluence of ∼1 × 1024 ions m−2. Raman and near edge X-ray absorption fine structure (NEXAFS) spectroscopy were used to characterize modifications to the graphitic structure. Ion irradiation was observed to decrease the graphitic content and induce disorder in the graphite. Subsequent plasma exposure decreased the graphitic content further. Structural and surface chemistry changes were observed to be greatest for the sample irradiated with the greatest fluence of MeV ions. D retention was measured using elastic recoil detection analysis and showed that ion irradiation increased the amount of retained deuterium in graphite by a factor of four. © 2014, Elsevier B.V.
Ions, Graphite, Carbon, Deuterium, Plasma, Heavy ion fusion reactions, Raman spectroscopy
Deslandes, A., Guenette, M. C., Corr, C. S., Karatchevtseva, I., Thomsen, L., Ionescu, M., Lumpkin, G. R. & Riley, D. P. (2014). Ion irradiated graphite exposed to fusion-relevant deuterium plasma. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 340, 21-26. doi:10.1016/j.nimb.2014.06.027