| Budget Amount *help |
¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000)
Fiscal Year 2012: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Fiscal Year 2010: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
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| Research Abstract |
In order to improve performance of superconducting coils, the new method to design the coils has been proposed. The method is based on a new idea thatthe maximum magnetic fields and the highest temperature areas are separated. Firstly, a measuring method of profile of Poynting’s vector around superconducting tapes or coils has been developed. In addition, a method to estimate local loss generation in windings has been established by applying Poynting’s vector method. Secondary, it was clarified that a test conductor composed of five MgB_2tapes has high stability, which is equal or more than that of NbTi Rutherford cable with high stability due to low resistive contact between strands. Finally, a new loss reduction method suppressing changes of magnetic fields has been proposed. And then the validity of the method has been experimentally confirmed by using Bi-2223 coil wound.
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