Carbon migration during methane injection experiments under ITER divertor-relevant conditions

K.E. Bystrov, L.B. Vegt, van der, G.A. Swaaij, van, T. Zaharia, Y. Kuang, W.J. Goedheer, G.C. De Temmerman

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1 Citation (Scopus)


Methane was injected into a high density low temperature hydrogen plasma beam (ne ¿ 1021 m-3, Te ~ 1 eV) in Pilot-PSI to study carbon transport and provide a benchmark case for modeling. Gas injection was performed through molybdenum samples that acted as collectors of redeposits. The CH A–X band emission plumes are localized near the injection hole with a typical width of ~3 mm and a decay length of ~1.5 mm. The geometry of the emission profile is not influenced by the electron temperature. The redeposition efficiency and codeposit structure depend on the surface temperature. Surface temperatures below 500 K promote growth of a-C:H films across the surface and lead to redeposition of up to 38% of injected carbon. Above 800 K the redeposition efficiency decreases strongly and carbon microparticles are found near the injection hole.
Original languageEnglish
Pages (from-to)S686-S689
Number of pages4
JournalJournal of Nuclear Materials
Issue numberSuppl.
Publication statusPublished - 2013


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