Abstract
Experimental results of graphite erosion under high fluxes by using a high flux irradiation device in Osaka University are reviewed. Results of chemical sputtering experiments by 5 keV D3+ beams with fluxes from 0.5 × 1021 to 3.9 × 1021 D/m2 s showed an increase in peak temperatures from 900 K to 980 K with flux for isotropic graphite and CFC. These peak temperatures are higher than those of low flux results (750 K-850 K, ≤ 1020 m-2 s-1). The peak yields did not show clear flux dependence. Results of radiation-enhanced sublimation (RES) experiments by 5 keV Ar+ beams with fluxes from 3.5 × 1019 to 1.5 × 1021 Ar/m2 s showed a significant decrease in the RES yields with flux for isotropic graphite and pyrolytic graphite. The flux dependence of the RES yields (total yields minus physical sputtering yields) was about ϕ-0.26 (ϕ: flux), while the flux dependence in fluxes from ∼1017 to ∼1019 Ar/m2 s was about ϕ-0.07. Comparison between models and experiments for chemical sputtering and RES are also shown.
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