| Project/Area Number |
63044048
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| Research Category |
Grant-in-Aid for international Scientific Research
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| Allocation Type | Single-year Grants |
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| Section | Joint Research |
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| Research Institution | Faculty of Engineering, Yokohama National University |
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Principal Investigator |
TSUKAMOTO O Yokohama National University, 工学部, 教授 (30017975)
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| Co-Investigator(Kenkyū-buntansha) |
E Bobrov マサチューセッツ工科大学, 江立磁気研究所, 上級研究員
Y Iwasa マサチューセッツ工科大学, 国立磁気研究所, 上級研究員
西嶋 茂宏 大阪大学, 産業科学研究所, 助手 (00156069)
藤田 博之 東京大学, 生産技術研究所, 助教授 (90134642)
船木 和夫 九州大学, 工学部, 助教授 (60091352)
NISHIJIMA S Osaka University
IWASA Y M. I. T.
FUNAKI K Kyusyu University
FUJITA H Tokyo University
BOBROV E M. I. T.
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥6,500,000 (Direct Cost: ¥6,500,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1989: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Superconducting magnet / High current density / High stability / Quench / Disturbance / Conductor motion / Reduction of disturbance energy |
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| Research Abstract |
The purpose of this study is to develop a technology for high-stability and high-current density superconducting magnets with Japan-US cooperative research activities.
Actual themes are to study ;
(1) on sources and mechanism of disturbances causing quench of a superconducting magnet,
(2) on disturbance characteristics and quantification of disturbance energy,
(3) on response of superconductors and magnets to disturbances,
(4) on techniques for reducing disturbance energy,
(5) on quench detection and protection methods.
The study has been performed as follows. 8 total number of Japan side investigators stayed in the US side institute (MIT Francis Bitter National Magnet Laboratory) to do experiments using the its facilities with cooperation of US side investigators, 5 total number of US-side investigators were invited to institutes of Japan side investigators to discuss about related subjects. During the term of this study, we organized the International Symposium on Superconductor Stability (
… More
SSS '90) and about 130 attendants from 11 countries discussed and exchanged information on the stability.
The outcomes of the study are summarized as follows ;
(a) Mechanical disturbances such as conductor motions and cracks in structual material are dominant causes for magnet quench.
(b) Formulas to estimate disturbance energy due to conductor motion have been derived and the estimated results well explain experimental data.
(c) Conductor stability has been analyzed by taking account of the characteristics of the disturbance which have we obtained. The analyzed results well explained the experimental data.
(d) Copper plated spacer, spacer made of GFRP with three dimensional fiber structure and accurate dimensions of the conductors and spacers greatly improve the stability of the magnets.
(e) Quench propagation characteristics have been analyzed taking account of anisotropic properties of the winding and the analyzed result well agreed with experimental results.
Those results of the study, we believe, have contributed to the technology for high current density and high stability superconducting magnets. Less
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