| Project/Area Number |
11558061
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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 | 展開研究 |
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| Research Field |
Nuclear engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
TERAI Takayuki The University of Tokyo, Graduate school of Engineering, Professor, 大学院・工学系研究科, 教授 (90175472)
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| Co-Investigator(Kenkyū-buntansha) |
YONEOKA Toshiaki The University of Tokyo, Graduate school of Engineering, Research Associate, 大学院・工学系研究科, 助手 (40013221)
SHIMOYAMA Junichi The University of Tokyo, Engineering Research Institute, Associate Professor, 工学部附属総合試験所, 助教授 (20251366)
YAMAWAKI Mitio The University of Tokyo, Graduate school of Engineering, Professor, 大学院・工学系研究科, 教授 (30011076)
HAYASHI Kimio Japan Atomic Energy Research Institute, group leader/Laboratory head, 室長/研究職
MURAKAMI Masato International Superconductivity Technology Center, Devision head, 研究部長
山口 憲司 日本原子力研究所, 物質科学研究部, 副主任研究員 (50210357)
小野 双葉 東京大学, 大学院・工学系研究科, 助手 (00011198)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2001: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2000: ¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1999: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | high-Tc oxide superconductor / neutron / critical current density / pinning potential / anneal / induced radioactivity / uranium doping / bulk / 高温超伝導 / 臨海電流密度 / 原子炉 / ピン止め / ウラン / 磁束 / 高温酸化物超伝導体 / 中性子照射 / 照射欠陥 / ピン止め中心 |
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| Research Abstract |
This study aimed to increase the critical current density Jc of high-Tc conductors to the level for practical application with fast-neutron irradiation or thermal-neutron irradiation after uranium doping. We irradiated Bi-2212 single crystal specimens and Y-123 bulk specimens fabricated by melt-growth process with fast neutrons in YAYOI reactor, University of Tokyo, JMTR & JRR-3, JAERI and measured the change in superconducting properties due to irradiation. Very large enhancement in Jc and pinning potential for the specimens irradiated with the order of 10^<17> n/cm^2 were observed. Thermal annealing also much increased Jc and pinning potential for heavily irradiated specimens at 673K.
We also evaluated the induced radioactivities of the materials and uranium-doped Y-123. Most of the radioactivity came from the impurities in the materials. It is concluded that decrease of radioactivity is possible by decreasing some impurities including Zn, Co, etc, and kg level of the materials can be improved in superconducting properties for practical use in spite of the radioactivity.
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