2012 Fiscal Year Final Research Report
Elucidation of formation mechanisms of tungsten lattice defects under low-energy and dense hydrogen implantation
| Project/Area Number |
22560821
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
KATO Daiji 核融合科学研究所, ヘリカル研究部, 准教授 (60370136)
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| Project Period (FY) |
2010 – 2012
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| Keywords | タングステン / 格子欠陥 / 水素効果 / 第一原理計算 |
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| Research Abstract |
Tungsten vacancies and its interaction with hydrogen atoms were characterized based on results from first-principle simulations of a bulk tungsten containing an extraordinary high concentration of the hydrogen atoms and the vacancies. Hydrogen effects on formation and distribution of lattice defects in the bulk tungsten were evaluated quantitatively. Present results are relevant to hitherto unknown physical mechanisms which may explain anomalous behaviors of lattice defects and enhanced hydrogen retentions found in the tungsten exposed to a high flux and a large fluence of hydrogen ions, that is a big issue in nuclear fusion reactor materials researches.
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