Experimental apparatus for measurements of the stress-induced change in critical currents of the monofilamentary Nb3Sn wires is described, and also shown is an example of the critical current characteristics as a function of tensile strain. The sample used is a round Nb3Sn wire with the diameter of 0.25mm, the thickness of Nb3Sn layer of about 7μm and the bronze to Nb ratio of 3.4.
