Experimental Study on Magnetic Field Dependence of Critical Current for Soldered-Stacked-Square (3S) HTS Wires

Stacking structure is the widely-accepted method to improve the current carrying capacity of second-generation high temperature superconducting (2G HTS) tapes. Meanwhile, due to the influence of high aspect ratio, narrowing concept becomes an effective way to improve the electromagnetic characteristics of HTS tapes. Solder-Stacked-Square (3S) HTS wire is novel HTS conductor with 1 mm width, which is derived from the normal HTS tapes and combined the meaning of both stacking and narrowing. As is known, the external magnetic field affects the critical current of HTS tapes. In order to get the reliable critical current of 3S HTS wire for the real application, it is important to evaluate the magnetic field dependence of 3S HTS wire in detail. However, the stacking process makes the 3S wire structure flexible and changeable. To be clear about the stacking effect of 3S wire on the critical current, we prepared 3S wire samples, which are respectively stacked by three different structures. In this paper, we measured the magnetic field dependence of critical current for these 3S wire samples. The experimental results are the necessary support for the design of 3S wire applications.