| Project/Area Number |
17K06996
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Aichi Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
上杉 喜彦 金沢大学, 電子情報通信学系, 教授 (90213339)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | プラズマ・核融合 / タングステン材料 / 皺構造 / 放射冷却 / 窒化タングステン / ファズ / ナノ繊維構造の複雑性 / ダイバータ / タングステン / 表面拡散 / アルファ・タングステン / 結晶面方位分布 / 窒化 / ピン留め効果 / 重水素 / ウイスカー / 表面皺構造 / プラズマ運動量流入 |
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| Outline of Final Research Achievements |
Important new effects of stationary or pulsed plasma heat and particle loads on plasma-facing wall, especially tungsten materials, in magnetically confined fusion plasmas were studied in a linear plasma device for a variety of radiative impurity species, such as neon (Ne) and nitrogen (N2), and moreover helium (He) as a fusion product. A high-temperature tungsten surface irradiated by Ne was found to make a microwrinkle due to buckling process. In the case of N2, tungsten nitride nanostructures on tungsten surfaces were found, depending on the surface temperature, while ND radical as a precursor of deuterated ammonia formation was found in the plasma. Ammonia would be considered to make a worry on vacuum pumping. Concerning He effect, the origin of fuzz-fibers complexity were discussed in terms of crystal grain-surface distribution measured with a capillary X-ray diffraction for fuzz powder.
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| Academic Significance and Societal Importance of the Research Achievements |
地球環境に適応したエネルギー源の候補の一つとしての核融合炉実現には多くの課題があるが、本研究は健全な炉実現に必要な炉壁への熱・粒子負荷にかかわる問題を、放射冷却に必要な注入ガス（ネオンと窒素）と反応生成物（ヘリウム）に注目して行った。皺構造形成、窒化物生成や繊維状ナノ構造の複雑性などに関して学術の向上に、また核融合研究開発に貢献した。
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