| Budget Amount *help |
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
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| Outline of Final Research Achievements |
YBCO high-temperature superconducting wires are expected as superconducting wires that enable the development of high-field superconducting coils. However, because the critical current (the maximum current that can maintain the superconducting state) is drastically reduced by mechanical strain, special considerations for the coiling technology are required to prevent from a decrease in the critical current due to extra winding tension and bending strain. This study challenged to develop a helical coil which has a three-dimensionally complex shaped winding. It is considered difficult to fabricate a helical coil using YBCO tape-shaped wires because complex strains such as tension and bending are simultaneously applied to the YBCO wires. From the results of short sample tests, a winding machine development and coil excitation tests, this study showed technical solutions for the winding method of a high-temperature superconducting helical coil without a decrease in the critical current.
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