Effect of D on the evolution of radiation damage in W during high temperature annealing
M. Pečovnik, S. Markelj, Mitja Kelemen, T. Schwarz‐Selinger
Abstract
The effect of deuterium (D) on the annealing of radiation damage was studied. Tungsten (W) samples were sequentially irradiated with 20 MeV W ions at room temperature and loaded with a low-temperature D plasma at 370 K to decorate the created defects. After this, half of each sample was W irradiated at room temperature again to create additional radiation damage. To study the evolution of the created defects with D being present, samples were annealed by heating them to a desired temperature and held for 2 h. The surviving displacement damage was decorated by re-exposing the samples to the same D plasma as before. At various steps of the experiment the D depth profiles were measured using nuclear reaction analysis and after the last re-exposure a thermal desorption spectroscopy analysis was done to determine the D desorption spectra.