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The transport properties of the superconducting Nb3Sn layers in the strands strongly depend on the strain state. Knowledge of the influence of axial strain, periodic bending and contact stress on the critical current (Ic) of the used strands is inevitable to gain sufficient confidence in an economic design and stable operation of ITER Nb3Sn. In the past years we have measured the Ic and n-value of various ITER strands with different layout in the TARSIS facility, when subjected to spatial periodic contact stress at a temperature of 4.2 K and in a magnet field of 12 T. Recently we have made the setup suitable for application of homogeneous load along the length of the wire (125 mm) in order to evaluate possible differences related to spatial stress and possible current distribution. We present an overview of the results obtained so far on an ITER TF bronze and internal tin strand.

ieee transactions on applied superconductivity

Spatial Periodic and Homogeneous Transverse Stress Loading on ITER TF <formula formulatype="inline"><tex Notation="TeX">${\rm Nb}_{3}{\rm Sn}$</tex></formula> Bronze and Internal Tin Strand

Spatial Periodic and Homogeneous Transverse Stress Loading on ITER TF ${\rm Nb}_{3}{\rm Sn}$ Bronze and Internal Tin Strand