Magnetic and Electromechanical Characterization of a High-JC RRP Wire for the HL-LHC MQXF Cable

Abstract

In this work, we summarize the results of a series of inductive and transport measurements aimed at the evaluation of the electromechanical performance of a 0.85 mm diameter RRP wire procured for the HL-LHC project. The critical current dependence on the magnetic field and uniaxial applied strain (between −0.2 and 0.5%) has been investigated in a temperature range between 4.5 K and 10 K. Furthermore, the wire magnetization up to 12 T has been measured at different temperatures (4.3 K–14 K) to determine the wire's effective filament diameter and to complement the critical current density in the temperature and field range where transport current measurements were not available. The experimental results have been analysed in the framework of the Extrapolative Scaling Expression, by using a multi-step approach for the data fitting. These results provide an accurate parameterization of the critical surface in terms of field, temperature and strain, and can be used as a general reference for magnet design.