Abstract
Graphite limiters which had been incorporated in the Tokamaks ASDEX and JET were analysed by frequency-dependent photoacoustics. A depth dependence was found for the effusivity (kρc) 1 2 , the thermal parameter governing transient surface heating. The thermal depth profile observed before plasma exposure is related to the surface roughness and porosity. After exposure to the plasmas and depending on the position of the sample in the Tokamaks, changes of the effusivity to both lower and higher values are measured and may be related to lattice damage from energetic particle bombardment and to morphological modifications in regions which experienced higher heat loads.
Published Version
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