Influence of a Stainless Steel Core on Coupling Loss, Interstrand Contact Resistance, and Magnetization of an $\hbox {Nb}_{3}\hbox {Sn}$ Rutherford Cable

Calorimetric and magnetic AC loss measurements were made on a pair of TQ (ldquotechnology quadrupolerdquo) class cables, one with and the other without a stainless steel core. The coupling losses are compared to the cables´ hysteretic losses determined at the same time; the latter being compared to the magnetically measured hysteretic losses of individual strand segments. The outcomes of these measurements were: (i) the effective interstrand contact resistances of the uncored and cored cables, (ii) their hysteretic losses translated in terms of ldquoeffective, ICRs (interstrand contact resistances)rdquo for comparison with the above, and hence an evaluation of the real effectiveness of the core in a contemporary cable (iii) a comparison of the cable and strand hysteretic losses and hence an estimate of an effective filament diameter, , for the as-cabled strands.