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Report No.

Transport of heavy hydrocarbon and its redeposition on plasma facing walls

Oya, Kaoru*; Inai, Kensuke*; Kikuhara, Yasuyuki*; Nakano, Tomohide; Kawata, Jun*; Kawazome, Hayato*; Ueda, Yoshio*; Tanabe, Tetsuo*

Redeposition of C$$_{2}$$H$$_{4}$$ and C$$_{2}$$H$$_{6}$$ chemically eroded from carbon walls is simulated by EDDY code incorporated with the reflection on a hydrogenated and amorphized carbon surface. The redeposition rate for heavy hydrocarbons is drastically decreased by introduction of the reflection. The redeposition patterns on the surface are enlarged by the reflection, but it is narrower for the heavy hydrocarbons than for CH$$_{4}$$. The photon emissions of C$$_{2}$$ from C$$_{2}$$H$$_{4}$$ (C$$_{2}$$H$$_{6}$$) decay faster than that of CH from CH$$_{4}$$ in high-temperature ($$>$$10 eV) plasmas, which reproduces the difference of the decay of the CD and C$$_{2}$$ light intensities observed in the vicinity of the outer diverter plates of JT-60U. For such temperatures, the inverse photon-efficiency, which is defined as the ratio of the number of the launching hydrocarbons to the photoemission events of CH and C$$_{2}$$, is in good agreement with the values observed in JT-60U experiments.



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