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Investigation of ITER Use Internal-Sn Nb3Sn Superconducting Wire Through Irreversibility Temperature Measurement

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6 Author(s)
Zhang Chaowu ; Shaanxi Univ. of Sci. & Technol. ; Sulpice, A. ; Zhou Lian ; Soubeyroux, J.
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By means of a SQUID magnetometer, the irreversibility temperatures and magnetization transitions of an ITER-type internal-Sn Nb3Sn superconducting wire were measured during warming and cooling cycles at a fixed magnetic field. The results obtained show that the irreversibility temperature T*(H) is strongly dependent on A15 phase composition and can be used to optimize the heat treatment process for the internal-Sn Nb3Sn wire. The A15 phase composition in internal-Sn Nb3Sn wire is temperature independent for full-time reaction. From T*(H) and magnetization transition analysis, the heat treatment condition of our ITER use wire is optimized as 675 degC/128 h, which results in the best A15 phase composition suitable for high-field application

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Applied Superconductivity, IEEE Transactions on  (Volume:17 ,  Issue: 1 )