Effect of the presence of helium in tungsten on deuterium retention
| Autor: | Yu. M. Gasparyan, V. S. Efimov, Z. R. Harutyunyan, S. Kanashenko, A.V. Kaziev, M.M. Kharkov, O. V. Ogorodnikova |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Thermal desorption Analytical chemistry chemistry.chemical_element 02 engineering and technology Tungsten 021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas Ion Nuclear Energy and Engineering chemistry Deuterium 0103 physical sciences General Materials Science Irradiation Surface layer Inductively coupled plasma 0210 nano-technology Helium |
| Zdroj: | Journal of Nuclear Materials. 548:152873 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2021.152873 |
| Popis: | Tungsten (W) samples were pre-irradiated with low-energy helium (He) ions with an energy of 80 eV, flux of 1021 He/m2s, at a sample temperature of 1200–1250 K in a inductively coupled plasma (ICP) source facility. Such irradiation conditions led to a formation of a nano-structured surface layer of tungsten, called ‘fuzz’. These samples were then irradiated with D3+ ions with an energy of 2 keV and small doses of 1019 D/m2 at room temperature and in-situ thermal desorption analysis (TDS) was performed. It was found that the main factor determining the deuterium (D) retention in W samples pre-irradiated with helium is the concentration of helium below the surface, namely, the D retention was increased with decreasing the He concentration until the nanostructured W ‘fuzz’ was removed. The effect of nano-structured tungsten ‘fuzz’ is only in a decrease of the reflection coefficient of deuterium ions compared to a smoother surface, resulting in the increase of the D influx into W and, consequently, increase of the D retention. However, this increase has a minor effect on the D retention compared to the He concentration in the subsurface layer of W. |
| Databáze: | OpenAIRE |
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