Abstract
Surface morphology and its relation to the erosion mechanism of graphite materials (pyrolytic graphite (PG) and isotropic graphite) irradiated by high flux beams were studied. The irradiation was made by a 5 keV Ar beam with a maximum flux of 1.3 × 10 21 Ar/m 2 s with irradiation angles and fluences, and sample temperatures as experimental parameters. In the case of PG, the surface morphology was different between irradiation at RT (physical sputtering) and at elevated temperatures (1980 K, radiation enhanced sublimation (RES)). In addition, irradiation at oblique incidence (60°) tended to flatten the surface at RT, while at 1980 K the surface roughness developed to some extent. No clear flux dependence of the surface morphology was observed at 1980 K as long as the mean eroded depth was similar, though the RES yield was flux-dependent (decrease with flux). In the case of isotropic graphite, the distinctive surface morphology observed for PG was not found.
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