Abstract
Deuterium interaction with vacancy clusters in tungsten was studied by means of thermal desorption spectroscopy (TDS). A recrystallized W foil was used as a sample, and the vacancy clusters were formed in the bulk by irradiation with 10keV/D ions to the fluence of 3×1019D/m2 and subsequent annealing at the temperature of 800K. Then the sample was loaded with deuterium (0.67keV/D ions with a fluence of 1×1019D/m2), and TDS measurements with varying heating rates β in the range of 0.25–4K/s were performed. The high temperature peak with the maximum at around 700K was attributed to deuterium desorption from vacancy clusters and the detrapping energy for this type of defects was determined from the slope of the Arrhenius-like plot ln(β/Tm2) versus 1/Tm, where Tm is the peak position. The detrapping energy calculated this way is 2.10±0.02eV.
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