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Using transient grating spectroscopy, we measure thermal diffusivity andsurface acoustic wave speed in tungsten exposed to different fluences ofdeuterium plasma. Scanning electron microscopy (SEM) shows the formation ofsurface blisters that have similar morphology for all fluences. A significantreduction in thermal diffusivity and surface acoustic wave speed occurs as aresult of plasma exposure. A saturation of the thermal diffusivity reductionwith fluence is seen. Deuterium ion flux density appears play a more importantrole in the thermal diffusivity reduction than the fluence. These results haveimportant implications for plasma facing components in future fusion reactors.

Transient grating spectroscopy of thermal diffusivity degradation in deuterium implanted tungsten