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The {\rm J}_{\rm c}({\rm B},{\rm T}) Characterization of Commercial NbTi Strands for ITER PF 1&6 Coils

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8 Author(s)
Salunin, N. ; Bochvar Inst., VNIINM, Moscow, Russia ; Kozlenkova, N. ; Polikarpova, M. ; Potanina, L.
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The commercial multifilamentary NbTi strands produced for ITER poloidal field coils PF1 and PF6 have been characterized on Jc(B,T) at various manufacturing stages: bare strand, Ni-plated strand and the strand after impregnation heat treatment. We present the results of critical current measurements at magnetic fields in the range of 4.5-10 T, and temperature within 4.2-7 K. Current sharing temperature Tcs of these strands has been determined with a precision of few tens of mK, using fit formula that provides the critical current density as a function of temperature and field. The results show that Tcs of commercial strands exceeds the required value of 5.9 K at 6.4 T and the operating current of 33 A. These measurements allowed us to get a database, essential for the future analysis of the experimental data, and to find the strand characteristic parameters for the Jc(B,T) fit.

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Applied Superconductivity, IEEE Transactions on  (Volume:22 ,  Issue: 3 )