Development of the $\hbox {Nb}_{3}\hbox {Sn}$ Rutherford Cable for the EuCARD High Field Dipole Magnet FRESCA2

This paper reports on the development of the Nb₃Sn Rutherford cable for the EuCARD high-field dipole magnet FRESCA2 designed to achieve a central field of 13 T at 4.2 K in a 100-mm bore. The FRESCA2 cable is rectangular and made of 40 strands of 1.0-mm diameter. The cable shall be able to carry a current of 15.7 kA at 4.2 K in a field of 15 T. In the first stage of cable development, focus was put on the cable parameters (cable width, cable mid-thickness and pitch length) to provide a cable made with Nb₃Sn Powder-In-Tube strands achieving both a minimal critical current reduction of the strand during cabling and a good mechanical stability of the cable for coil winding. In the second stage of cable development, the cable was produced with Nb₃Sn RRP strands. The cables, which were produced following an iterative process, were characterized and the results of the critical current measurements of extracted strands are discussed together with the cabling parameters and the type of strand.