| Project/Area Number |
03452187
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
計測・制御工学
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| Research Institution | Kobe University |
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Principal Investigator |
MINEMOTO Takumi Kobe University, Faculty of Engineering, Professor, 工学部, 教授 (60031093)
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| Co-Investigator(Kenkyū-buntansha) |
ITOH Mineo Kinki University, Faculty of Science and Technology, Lecturer, 理工学部, 講師 (10088429)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1992: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1991: ¥3,100,000 (Direct Cost: ¥3,100,000)
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| Keywords | high temperature superconductor / thick film of high Tc superconductor / magnetic shielding / YBCO superconductor / Meissner effect / magnetic force microscope / 磁気シ-ルド / 磁気トラップ / マイスナ-効果 |
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| Research Abstract |
The following results have been obtained in this research.
(1) By the addition of a suitable amount of silver (7 wt %), the zero-resistance temperature of Y-Ba-Cu-O (YBCO) increased by 3 K and its critical current density became 9 times larger than that of YBCO without Ag.
(2) A magnetic force sensing system using a highly sensitive force sensor has been developed to measure two dimensional distribution of the Meissner effect. Using this system, it was founded that uniformity of superconductivity in a superconductor is affected strongly by the distribution of its components.
(3) The maximum shielded magnetic flux densities of cylinders made with bulk YBCO were about several tens Gauss. But the maximum shielded flux density was increased successfully to 400 G by imposing a cylinder made with some chiep ferro-magnetic material over the YBCO cylinder.
(4) We succeeded in oxidizing a Cu cylinder surface in a state of thin film and molding a superconducting YBCO thick film on the cylinder surface.
(5) The maximum shielded magnetic flux density of a thick film YBCO cylinder made as a trial was 30 mG because the YBCO film was porous. The magnetic shielding effect of thick YBCO films will be improved by making the film with higher YBCO density.
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