TFTR黒鉛プローブ表面のXPS-SIMSによる分析

概要

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Deposition probe measurements using a cylindrical 4D C-C composite was conducted to investigate the deposition layers on the graphite first wall of TFTR (Tokamak Fusion Test Reactor), Princeton University. XPS measurements revealed that the surface atomic compositions of probe areas differed from each other. This indicates that the probe surface was covered with deposits. SIMS measurements detected lithium, carbon, oxygen and deuterium. Lithium was found even at the depth ranging up to 7-8 μm far beyond the expected depth and/or thickness of the deposits. This suggests that Li atoms diffused to the bulk along grain boundaries of the probe. Another characteristic feature of SIMS spectra is the appearance of Li-relating signals such as M/e=28(6Li2O), 29(6Li7LiO) and 30(7Li2O), whereas M/e=22 and 44 (6LiO and 6Li2O2) were not observed. It is concluded that the surface of the TFTR graphite probe was covered with carbon deposits containing Li, H, D and O with a trace amount of Cr and Fe from stainless steel.
富山大学の論文