Displacement damage stabilization by hydrogen presence under simultaneous W ion damage and D ion exposure
Sabina Markelj , Thomas Schwarz-Selinger , Matic Pečovnik , Anze Zaloznik , Mitja Kelemen , Iztok Čadež , Johannes Bauer , Primoz Pelicon , Witold Chromiński , Łukasz Ciupiński
AbstractPolycrystalline tungsten (W) samples were simultaneously irradiated by 10.8 MeV W ions and exposed to 300 eV deuterium (D) ions at different temperatures ranging from 450 K to 1000 K. After simultaneous W ion irradiation and D ion exposure the samples were additionally exposed to low-energy D ions at 450 K in order to populate all the defects created beforehand. The amount of damage created was evaluated by measuring D depth profiles and D thermal desorption spectra. Results were compared with data obtained in a sequential experiment where samples were first irradiated by 10.8 MeV W ions and only afterwards exposed to 300 eV D ions at 450 K to populate the created defects. At 450 K we observed a two times higher maximum D concentration for the simultaneous case as compared with the sequential case. At 600 K and 800 K the ratio between the simultaneous and sequential case decreases to about 1.6 and 1.2, respectively, and increases again to a factor of 2 at 1000 K. We attribute this dependence on temperature to the change in the concentration of mobile and trapped D during the simultaneous exposures, which is in line with theoretical calculations predicting that trapped D in a vacancy prevents vacancy annihilation with self-interstitials.
|Journal series||Nuclear Fusion, ISSN 0029-5515, e-ISSN 1741-4326|
|Publication size in sheets||4302.5|
|Keywords in English||tungsten, deuterium retention, displacement damage, damage stabilization, nuclear reaction analysis, thermal desorption spectroscopy|
|Score||= 140.0, 09-06-2020, ArticleFromJournal|
|Publication indicators||= 4; = 1; : 2016 = 0.942; : 2018 = 3.516 (2) - 2018=3.34 (5)|
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