| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
Tungsten shows promise as structural material used in fusion reactors in the future. Tritium used in the reactor as fuel is radioisotope and we are worried about its large amount of retention in the tungsten specimen. Vacancy and vacancy cluster in tungsten are main trap sites of the hydrogen isotope. So, their stable structures and growth process in tungsten specimen are studied by numerical simulations. As a result, impurities in the metal contribute to the stabilization of the vacancy clusters. In particular, oxygen play an important role in the stabilization.
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