| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2014: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2012: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
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| Outline of Final Research Achievements |
We investigated influence of unbalanced current among strands on local strand deformation in a cable-in-conduit conductor (CICC). The unbalanced current, which is caused by the non-uniform circulating current induced among strands by external magnetic field and inhomogeneous resistance distribution in a joint, causes the local electromagnetic force. The non-uniform circulating current distribution in the CICC was calculated by contact resistances and inductance of the loop between strands with twist deformation. Our results show that local unbalanced current is improved when the n-th order sub-cable twist pitch is a multiple of all the previous sub-cables twist pitch. We estimated the displacement of a strand on the cable surface using beam length in each triplet and circulating current in each loop. In order to prevent local large displacement of a strand, it is effective to prevent unbalanced current distribution, to improve 0.2% strength-proof, and to shorten the beam length.
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