Defect evolution in tungsten exposed to helium plasma and deuterium plasmas studied by slow positron beam
| Autor: | Xiao-Dong Lin, Chi-Shung Yip, Bo-Yu Wu, Yu-Ping Xu, Guang-Nan Luo, Yi-Ming Lyu, Xin Shen, Zhongshi Yang, Xiang Gao, Hai-Shan Zhou, Xiao-Chun Li, Xingzhong Cao |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Nuclear and High Energy Physics Materials science genetic structures Materials Science (miscellaneous) chemistry.chemical_element Tungsten Helium plasma Fluence Helium Spectroscopy TK9001-9401 technology industry and agriculture Plasma respiratory system Deuterium Nuclear Energy and Engineering chemistry EAST Nuclear engineering. Atomic power Defects Atomic physics Doppler broadening circulatory and respiratory physiology |
| Zdroj: | Nuclear Materials and Energy, Vol 29, Iss, Pp 101094-(2021) |
| ISSN: | 2352-1791 |
| Popis: | Comparison of defect formation in tungsten samples exposed only to a helium plasma and those exposed to both helium plasma and subsequent deuterium plasmas is performed via Doppler broadening spectroscopy in the positron annihilation technique (DBS-PA). The S parameters of tungsten samples after helium plasma exposure increased with the increase of the incident fluence, which indicates that low energy helium plasma could induce the formation of defects such as nano-sized helium bubbles and dislocations in tungsten. The S parameters of samples exposed to helium incident fluence of 7.9 × 1021 He/m2 enhanced after deuterium plasmas exposure, indicating that low energy deuterium plasmas could form defects in tungsten too. Unexpectedly, deuterium plasmas exposure did not significantly influence the S parameters of the tungsten sample with helium incident fluence of 3.9 × 1022 He/m2, and reduced the S parameters of the tungsten sample with helium incident fluence of 7.9 × 1022 He/m2. These variations of S parameters could be associated with the occupation of nano-sized helium bubbles by deuterium atoms. This indicates possible competition between the increased density of vacancy-type defects by deuterium plasmas exposure and the filling of nano-sized helium bubbles by deuterium atoms, reducing detectability of these defects. |
| Databáze: | OpenAIRE |
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