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Magnetization studies of high Jc Nb3Sn strands

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7 Author(s)
Ghosh, A.K. ; Brookhaven Nat. Lab., Upton, NY, USA ; Cooley, L.D. ; Moodenbaugh, A.R. ; Parrell, J.A.
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Magnetization measurements have been made on several high Jc Nb3Sn strands fabricated by different internal-Sn designs. In general these conductors have high magnetization at low fields, often exhibiting flux-jumps that are characteristic of large superconductor diameter. The effective filament size deff is approximately the size of the sub-element because the filament pack within each sub-element is fully coupled. Dividing the filament pack of the sub-element by adding Ta is effective for reducing deff and magnetization instability. But, some residual coupling across the dividers seems to remain below 6 K, perhaps due to Ta3Sn. Implications for accelerator magnets are discussed.

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Applied Superconductivity, IEEE Transactions on  (Volume:15 ,  Issue: 2 )