1. Molecular dynamics study of the hydrogen and helium interaction in tungsten.
- Author
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Li, Xiao-Chun, Lu, Tao, Pan, Xin-Dong, Xu, Yu-Ping, Niu, Guo-Jian, Xu, Qian, Zhou, Hai-Shan, and Luo, Guang-Nan
- Subjects
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TUNGSTEN alloys , *HELIUM , *MOLECULAR dynamics , *TUNGSTEN , *ATOM trapping , *BINDING energy , *FUSION reactors - 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]
- Published
- 2019
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