2021 Fiscal Year Final Research Report
Improvement of critical current of Nb3Sn wire by neutron irradiation
| Project/Area Number |
19K03804
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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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| Review Section |
Basic Section 14020:Nuclear fusion-related
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
Nishimura Arata 核融合科学研究所, その他部局等, 名誉教授 (60156099)
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| Co-Investigator(Kenkyū-buntansha) |
菱沼 良光 核融合科学研究所, ヘリカル研究部, 准教授 (00322529)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 中性子照射効果 / 超伝導線材 / ニオブ三スズ / 臨界電流 / 臨界温度 / 臨界磁場 / 量子化磁束 |
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| Outline of Final Research Achievements |
The overall picture of superconducting characteristics is shown by the state of the superconducting critical surface defined by the three physical parameters of critical current, critical temperature, and critical magnetic field. In this study, we established a neutron irradiation experiment method using a nuclear reactor, took up the Nb3Sn wire, which is a practical superconducting wire nowadays, and experimentally and systematically investigated how the critical surface of the Nb3Sn wire changes due to fast neutron irradiation. Then, based on the concept of quantized magnetic flux, it was pointed out that the irradiation defects possibly become pinning points of the quantized magnetic flux. After the consideration on the pinning force, the total amount of irradiation defects, the amorphization of A15 type superconducting crystals, and the thermal instability of irradiation defects, the change in the critical surface due to neutron irradiation was investigated and discussed.
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| Free Research Field |
核融合炉工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究課題の実施によって、原子炉を用いた中性子照射効果実験過程の確立および照射後試験法の確立が進められた。近年、低温超伝導材料の実用化とともに、高温超伝導材料の開発が精力的に進められている。核融合炉は、高温超伝導材料によって設計、製作される可能性が非常に高く、本研究課題で確立した手法によって、高温超伝導テープ材料などの中性子照射効果が、体系的に検討されることが期待される。核融合分野にとどまらず、高エネルギー粒子や加速器の分野においても、高速中性子や高エネルギー粒子の照射効果は重要な検討課題である。本研究課題を通じて、これらの分野の研究者の参加が促進されたことも大変重要な成果である。
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