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Synopsis of erosion and redeposition

In the chemical interaction of hydrogen plasmas with carbon-based plasma-facing components in fusion research important issues are still unresolved: the extrapolation of measured erosion yields to high particle fluxes as expected for a fusion reactor divertor and the transport and deposition of hydrocarbon molecules on the divertor plate and walls. At the occasion of the Carbon Workshop in a discussion session the present status of knowledge was defined, suggestions for improved measurements and data evaluation discussed and the most pressing data needs reviewed.