| Project/Area Number |
15360487
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Tohoku University |
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Principal Investigator |
HIDETOSHI Hashizume Tohoku University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (80198663)
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| Co-Investigator(Kenkyū-buntansha) |
YUKI Kazuhisa Graduate School of Engineering, Lecturer, 大学院工学研究科, 講師 (90302182)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2004: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2003: ¥8,500,000 (Direct Cost: ¥8,500,000)
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| Keywords | Remountable HTS Magnet / Butt Joint / High Temperature Superconductor / Joint Resistance / Laminated HTS Cable / 高温超電導体 / 分割型超伝導マグネット / バット接合 / 直接接合 / 分割型第一壁 / MHD圧損低減 / 核融合炉 |
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| Research Abstract |
Remountable HTS magnet system was proposed as a new design of fusion reactor to reduce both construction and maintenance costs in term of superconducting magnet. Objective of this study is feasibility demonstration of remountable HTS magnet by clarifying basic properties in butt joint of HTS cable and proving robustness of HTS cable against heat generation at jointing parts in butt joint at liquid nitrogen temperature below several hundreds amperes.
Firstly, fundamental studies on the butt joint of HTS tape were performed to clarify the basic properties. Experimental results showed that joint resistance increased when transport current increased. According to numerical analysis, the dependence of joint resistance on transport current is caused by degradation of HTS filament near the contact surface. It was also confirmed that relative position of HTS filament does not affect joint performance by the numerical analysis. The fact indicates that contact condition is dominant to decide the
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joint performance. From mentioned above, some basic properties in the butt joint of HTS cable was clarified. In addition, it was considered that metal-plating is predicted to be effective to protect and improve contact surface condition. Based on the fundamental studies, the butt joint performance of laminated HTS cable was evaluated experimentally. At first, it was confirmed that metal-plating was effective to protect and improve contact surface condition. Furthermore, thermal quench and decrease of critical current did not occur. This fact shows that HTS cable has robustness against heat generation at jointing parts in butt joint at liquid nitrogen temperature below several hundreds amperes. At the end of this study, prototype of the remountable HTS magnet was fabricated and its performance was evaluated to suggest future tasks of development of the remountable HTS magnet. And it was indicated that the remountable HTS magnet has an advantage in term of energy loss compared to copper magnet. Less
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