Screening Current Induced Stress/Strain Analysis of High Field REBCO Coils With Co-Winding or Over-Banding Reinforcement

Abstract

Inclusion of screening current induced stress (SCIS) is becoming more commonplace in the design of ultra-high field magnets with REBCO tapes. It is desired to comprehensively manage tensile hoop stress, compressive hoop stress, and tilting angle caused by the SCIS. In this study, we have implemented effects of winding and cooldown processes to an already developed FEM model and analyzed the stress/strain behavior considering the SCIS on REBCO pancake coils in a 35 T LTS/HTS magnet with co-winding or over-banding reinforcement. Effects of thermal contraction and winding tension, and advantages/disadvantages of the co-winding or over-banding method are discussed.