Deuterium retention and near-surface modification of ion-irradiated diamond exposed to fusion-relevant plasma
Alec Deslandes, Mathew C Guenette, Cormac S Corr, Inna Karatchevtseva, Lars Thomsen, Gregory R Lumpkin, Daniel P Riley
Nuclear Fusion | IOP PUBLISHING LTD | Published : 2014
Chemical vapour deposited diamond was irradiated with 5 MeV carbon ions to simulate the damage caused by collision cascades from neutron irradiation in a fusion environment. Ion-irradiated samples were then exposed to a deuterium plasma in MAGPIE with ion flux of ∼1.3 × 1021 ions m -2 s-1. Raman and near edge X-ray absorption fine structure (NEXAFS) spectroscopy were used to characterize the degree of disorder and sp2-bonding induced by the ion irradiation. The signals of sp2-bonded and disordered carbon were observed to decrease after exposure to the deuterium plasma, although sharp Raman peaks indicative of vacancy and interstitial defects induced by the MeV ions were less affected. Recove..View full abstract
Awarded by Australian Research Council
The NEXAFS research in this work was undertaken on the soft x-ray spectroscopy beamline at the Australian Synchrotron, Victoria, Australia. Samuel Batty is acknowledged for assistance with NEXAFS data collection. C. S. C. acknowledges support from the Australian Research Council through the Future Fellowship scheme (FT100100825). Dr Vladimir Levchenko is acknowledged for assistance with irradiations, and Dr Mihail Ionescu and the STAR technicians are acknowledged for assistance with ERDA setup.