Characteristics of Aluminium-Stabilized HTS Detector Magnet Cable at 4 K and 5 T

A high-temperature superconducting (HTS) cable for future particle detector magnets has been developed using a 99.3% pure aluminium alloy as a stabilizer for the HTS. This HTS conductor features a stack of four ReBCO tapes (4 mm wide, SuperOx) soldered to a tin-coated copper-clad aluminium alloy cable profile using tin–lead solder at 188 °C. Here, we experimentally demonstrate that the cable withstands both thermal cycling between 4 K and room temperature and Lorentz forces induced by external magnetic field of 5 T when the HTS cable is driven by 4.5 kA. The HTS cable has no visual damage and no change in the critical current after being exposed multiple times to these extreme conditions. We show that since the phase transition of ReBCO is gradual, an aluminium alloy with low residual resistivity ratio (RRR) can be used as a stabilizer, which brings many advantages, such as a better availability compared to pure aluminium and a mechanically stronger cable.