Abstract
Recent developments have lead to prospects of lower plasma edge temperatures in the divertor region of tokamaks and, consequently, a growing interest in the interaction of graphite with low-energy hydrogen ions (10s of eV). Here we present experimental measurements of methane and heavier hydrocarbon yields of pyrolytic graphite (300 K–1000 K temperature) for H + impact energies of 10–200 eV. Heavier hydrocarbons contribute significantly to the total chemical erosion yield at low energies. Comparison of CH 4 yields due to H + irradiation of graphite with similar results for CD 4 yields due to D + shows a smaller isotopic effect than anticipated based on previous H + and D + measurements. Comparisons are also made between the experimental results and a recently proposed model.
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