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Improvement of the critical current of multifilamentary Nb3Sn conductors under tensile stress

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1 Author(s)
Rupp, G. ; Siemens AG, Research Laboratories, Germany

In multifilamentary Nb3Sn conductors produced by solid state diffusion process, the Nb3Sn is subjected to a tensile stress, because the bronze contracts stronger than the Nb3Sn during cooling from the diffusion temperature to 4 K. The measurements carried out demonstrate that under externally applied tensile stress at 4 K, the critical current Icof these conductors increases and goes through a maximum Icmat a strain \varepsilon _{m} . This is caused by the decrease in pressure on the Nb3Sn through the external tensile stress; a further increase in the external stress leads to internal tensile stress. The compressive stress and the resulting shrinkage of the Nb3Sn increase with decreasing layer thickness, thereby Icm/Ic0increases (Ic0: initial value without strain). Icm/Ic0is solely dependent on \varepsilon _{m} and reaches (at 4.4 T) values above 1.4 at \varepsilon _{m} = 0.9 % for very thin Nb3Sn layers. \varepsilon _{m} increases as the share of Nb3Sn in the conductor cross-section decreases and accordingly behaves qualitatively as the thermally affected shrinkage of the Nb3Sn.

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Magnetics, IEEE Transactions on  (Volume:13 ,  Issue: 5 )