2000 Fiscal Year Final Research Report Summary
Research and Developments of High Current Joint with Low Resistance at Cryogenic Temperature
| Project/Area Number |
10650297
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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 |
電力工学・電気機器工学
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
YAMADA Shuichi National Institute for Fusion Science, LHD Project, Associate Professor, 大型ヘリカル研究部, 助教授 (50249968)
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| Co-Investigator(Kenkyū-buntansha) |
CHIKARAISHI Hirotaka National Institute for Fusion Science, LHD Project, Research Associate, 大型ヘリカル研究部, 助手 (60249969)
KITAGAWA Shiro National Institute for Fusion Science, LHD Project, Associate Professor, 大型ヘリカル研究部, 助教授 (40023725)
MITO Toshiyuki National Institute for Fusion Science, LHD Project, Professor, 大型ヘリカル研究部, 教授 (10166069)
TANAHASHI Shugo National Institute for Fusion Science, LHD Project, Professor
YAMADA Shuichi National Institute for Fusion Science, LHD Project, Associate Professor
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| Project Period (FY) |
1998 – 2000
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| Keywords | HTS materials / YBCO / Contact resistance / Joints with low resistance / LHD / SC bus-lines |
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| Research Abstract |
Research and developments of the high-current joint with low resistance at the cryogenic temperature have been conducted. The results are concluded as follows : (1) The voltage drop between the contact metals was studied as a function of the temperature of the coolant, the pressure of the contacting pieces and/or the current density. The use of the pure copper with large RRR (residual resistance ratio) is effective for the high-current splices, because it leads to increase of the thermal conduction, and to decrease of the Joule heat loss. (2) Two types of the 30 kA joint bus-bars have been developed ; one is stationary Cu bus-bar embedded of the SC wire, and another is a flexible joint by using NbTi/Cu superconductor. These joint bus-bars are applied in the SC current feeder system of the experimental fusion device, LHD.(3) We have developing the high Tc SC current feeders for the large scale SC coil system. The current carrying test of the prototype of the YBCO bulk conductor was successfully demonstrated up to 25 kA.
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