1-mm wide REBCO tapes have been produced through continuous fine cuts from a 5-mm wide one. Soldering-Stacked-Square (3S) wires were assembled by these narrow tapes and used for coil winding. The screening current field (SCF) introduced by the magnetization inside HTS wires were greatly reduced due to the narrower geometry of 3S wires. The remnant field caused by SCF were measured to be 40-70% less than a comparison coil wound by using normal 4-mm tapes, when both coils were discharged from 5 A, 10 A and 30 A at 77 K. These results conformed well with simulations based on H-formulation, which showed clear different screening current patterns inside 3S wires and normal tapes. This work shows a new way to reduce SCF of HTS coils, which will be of great importance for HTS magnets requiring high field stability and homogeneity.
This work was supported in part by the National Natural Science Foundation of China (Project 51577119).