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Blisters formed at tungsten surfaces due to deuterium ion bombardment have been studied systematically in the energy range 100 eV to 1 keV. The bombardment with 1 keV D{+} at room temperature (RT) shows that the blister size increases and the number of decreases with the deuterium fluence from 1E21 D{+}/cm{2}. No blisters are found at elevated temperatures between 600 and 800 C. For bombardment with an energy as low as 100 eV, blisters are observed at the high fluence of 1E21 D{+}/cm{2}. The blister size increases and the number decreases with the bombardment energy. Combined with scanning electron microscopy (SEM) ion beam depth profiling measurements have been used to investigate the effect of blister formation on the trapping behaviour of deuterium in tungsten. Double implantations, where 4 keV He{+} and 100 eV D{+}, respectively, were injected in W prior to the bombardment of 1 keV D{+} show a pronounced increase of deuterium retention and blister disappearance. Possible mechanisms are proposed to describe the observed phenomena.

Additional information

Authors: WANG A, Max-Planck-Institut für Plasmaphysik, Garching (DE) and Shanghai Institute of Nuclear Research, Academia Sinica (CN);ROTH J, Max-Planck-Institut für Plasmaphysik, Garching (DE);LINDIG S, Max-Planck-Institut für Plasmaphysik, Garching (DE);WU C H, Max-Planck-Institut für Plasmaphysik, EFDA, Garching (DE)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Vol. 299 (2001), pp.124-131
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