2006 Fiscal Year Final Research Report Summary
Mechanism of change in superconducting properties of superconducting materials by 14 MeV neutron irradiation
| Project/Area Number |
16560725
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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 |
NISHIMURA Arata National Institute for Fusion Science, Fusion Engineering Research Center, Professor, 炉工学研究センター, 教授 (60156099)
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| Co-Investigator(Kenkyū-buntansha) |
SEO Kazutaka National Institute for Fusion Science, Fusion Engineering Research Center, Research Associate, 炉工学研究センター, 助手 (70370137)
HISHINUMA Yoshimitsu National Institute for Fusion Science, Fusion Engineering Research Center, Research Associate, 炉工学研究センター, 助手 (00322529)
TAKEUCHI Takao National Institute for Materials Science, Superconducting Materials Center, Group Leader, 超伝導材料センター, グループリーダー (80354299)
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| Project Period (FY) |
2004 – 2006
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| Keywords | 14 MeV neutron / Nb_3Al wire / Nb_3Sn wire / Superconducting wire / Cryogenic irradiation / Critical temperature / Irradiation damage / Knock on effect |
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| Research Abstract |
1. Some investigations reported that a certain amount of fast neutron would come out through shielding blankets and reach superconducting magnets in International Thermo-nuclear Experimental Reactor. To research the mechanism of change in superconducting properties of superconducting wires, a new system for 14 MeV neutron irradiation at cryogenic temperatures was designed and installed. It was confirmed that the system worked well.
2. To measure the temperature precisely, the performance of PtCo resistive sensor, Au/Fe-Chromel thermo-couple and Cernox resistive sensor was investigated during and after the irradiation of 14 MeV neutron. As the results, Cernox sensor showed good performance and no clear degradation was observed as far as the test was carried out.
3. After the irradiation of 10^<20> n/m^2 14 MeV neutron, Nb_3Sn wire did not show any change in the critical temperature. However, a Nb_3Al wire which was heat treated by a rapid heating and quenching (RHQ) showed remarkable degradation of the critical temperature, although the Nb_3Al wire which was annealed at 800 degree in C for 10 hours after RHQ treatment did not show such change.
4. The critical temperature has strong relation with long range ordering (LRO) of the A15 crystalline. So, it was considered that the degradation of the critical temperature was caused by the disturbance of the LRO. The fast neutron hits the atom in A15 crystalline and kicks it out. The kicked out atom hits another atom and one vacancy remains after the knocking out. This knock on effect will disturb the ordering of the atom constituting the A15 crystalline, resulting in the worse change in the critical temperature.
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[Journal Article] 14 MeV Neutron Irradiation Effect on Superconducting Magnet Materials for Fusion Device2006
Author(s)
A.Nishimura, Y.Hishinuma, K.Seo, T.Tanaka, T.Muroga, S.Nishijima, K.Katagiri, T.Takeuchi, Y.Shindo, K.Ochiai, T.Nishitani, K.Okuno
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Journal Title
Advances in Cryogenic Engineering Vol. 52
Pages: 208-215
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics2006
Author(s)
A.Nishimura, Y.Hishinuma, K.Seo, T.Tanaka, T.Muroga, S.Nishijima, K.Katagiri, T.Takeuchi, Y.Shindo, K.Ochiai, T.Nishitani, K.Okuno
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Journal Title
Advances in Cryogenic Engineering Vol. 52
Pages: 241-248
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Design, Fabrication and Installation of Cryogenic Target System for 14 MeV Neutron Irradiation2005
Author(s)
A.Nishimura, Y.Hishinuma, T.Tanaka, T.Muroga, S.Nishijima, Y.Shindo, T.Takeuchi, K.Ochiai, T.Nishitani, K.Okuno
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Journal Title
Fusion Engineering and Design Vol. 75-79
Pages: 173-177
Description
「研究成果報告書概要(欧文)」より
