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Molecular dynamics study of the hydrogen and helium interaction in tungsten.
- Source :
-
Nuclear Instruments & Methods in Physics Research Section B . Sep2019, Vol. 455, p114-117. 4p. - Publication Year :
- 2019
-
Abstract
- Tungsten (W) and W alloys are regarded as the most promising candidates for plasma facing materials (PFMs), which will be widely used in the next generation of fusion reactors. However, blistering in W-PFM induced by extremely high fluxes of low-energy hydrogen (H) and helium (He) ions irradiation will seriously influence the plasma stability and limits the lifetime of PFM. We systematically investigate the interaction between H and He interaction in W using molecular dynamics (MD) calculations. The vacancy clusters can capture a large amount of H/He, and the H-He-vacancy clusters have much higher binding energy to He than to H. The binding energy of H-He-vacancy clusters to vacancy/W is positive, and H-He-vacancy clusters have strong trapping of W atoms and vacancies. He will strongly affect the H behavior in W, He atoms and He cluster will trap H atoms, thereby preventing the diffusion of H in W. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0168583X
- Volume :
- 455
- Database :
- Academic Search Index
- Journal :
- Nuclear Instruments & Methods in Physics Research Section B
- Publication Type :
- Academic Journal
- Accession number :
- 137341988
- Full Text :
- https://doi.org/10.1016/j.nimb.2019.06.033