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15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
Abstract:
Carbon sources and the sinks have been quantified in TEXTOR and are discussed in terms of short
and long range transport. The major source (22 g/h) is the graphite belt limiter, but part (10 g/h) of
the carbon is directly re-deposited after short range transport. Long range transport causes flake
formation on obstacles and neutralisers, but little and deuterium rich (D/C≈0.7) deposition in
remote areas. The rest is leaving via the pumps in gaseous form. This behaviour is different from that
in JET where large amounts of deuterium rich deposits were found in the louvers. Tungsten is
favoured for the ITER divertors because of its low sputtering yield for hydrogen, but melting and
erosion by carbon may be an additional concern. The short range transport of tungsten has been
investigated in a well defined experiment and quantitatively re-constructed by means of the
ERO-TEXTOR code. Code validation is necessary in order to increase the confidence and the
applicability to JET and ITER.
