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Abstract
The present magnet designs for the 16 T-dipoles of the Future Circular Collider entail transverse stresses up to 150-200 MPa on the Nb3Sn Rutherford cables. Assessing the stress tolerance of the conductor performance is therefore of paramount importance. In this talk, I will present the results of a measurement campaign on the electromechanical properties of high-performance Nb3Sn wires, carried out in the frame of the h2020-project EuroCirCol. The scope was to predict the degradation of Rutherford cables under stress from a single-wire experiment. Tests were performed in magnetic fields ranging between 16 T and 19 T on wires that were resin-impregnated similarly to the wires in the Rutherford cables of accelerator magnets. The irreversible stress limit, sirr, defined as the stress level corresponding to a permanent reduction of the critical current by 5% with respect to its initial value, was determined to be largely dependent on the type of impregnation and on the wire technology (Powder-In-Tube vs. Restacked-Rod-Process). Interestingly, sirr was found also to depend on the applied magnetic field. This observation allowed us to shed light on the mechanism dominating the irreversible reduction of the wire performance and to compare and reconcile our results with the irreversible limits measured on Rutherford cables, typically tested at fields below 12 T.
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