Abstract
Carbon materials such as isotropic graphite and C/C composite are widely used for first walls or divertor plates in fusion reactors such as JT-60. In this respect, as well as from fundamental viewpoints, observations of microstructural change in ion-irradiated graphite is important. Although radiation damage in carbon materials has widely been studied, there are few data in this field examined by Electron Energy Loss Spectroscopy. The present paper reports the results of in-situ EELS observation of ion-irradiated crystalline graphite.Specimens used in this experiment were pseudo-monocrystal graphite supplied from Le Carbone Lorraine. Thin films of the graphite suitable for transmission electron microscopy were made by crashing a small portion of the sample in a mortar with npropyl alcohol. The resultant flake-like thin films were scooped up with a micro mesh, and then irradiated with 10 keV ions at an ambient temperature with a flux of 6.3×1013H/cm2s. The apparatus schematically shown in Fig.1 was used for the ion irradiation as well as for electron microscopy and electron energy loss spectroscopy.
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