Thermal response of structured and contaminated carbon surfaces to heat pulses

Experiments involving well-defined heat pulses of laser radiation on the CFC target material NB31 and plasma-exposed CFC-samples with known composition and thickness of the contamination layer have been performed to investigate the thermal properties and behaviour at the surface. Special attention is focussed on the dependence of the surface temperature enhancement and its temporal evolution on the amount of the deposited material. The measured surface temperature excursions are compared with values of analytical and numerical solutions of the heat diffusion equation taking into account a surface region with low thermal conductivity or poor thermal contact to the underlying substrate material.