Measured Losses in Pulsed Superconducting Solenoid Magnets

AC, or cyclic, energy losses were determined in geometrically similar solenoids wound with single-core, untwisted-multicore, and twisted-multicore composite superconductor. The losses were larger in the untwisted-multicore conductor than in the corresponding single-core case. When the multicore conductor was twisted, the losses were markedly reduced. The multicore conductor, when both twisted and untwisted, was remarkably free of flux jumps; thus the filament diameter of 0.0013 in. may be small enough to provide intrinsic stability.