Transport current densities of MgB2 wire, cable and continually transposed conductor

Multi-core MgB2 wire, cable and continually transposed conductor (CTC) have been assembled from a single-core in situ made Ti/Cu sheathed composite. It was shown that the filament's current densities Jc of composed wire, cable and CTC are comparable, but the engineering current densities Je and the window current densities Jw are much different. MgB2 cable shows apparently lower sensitivity to bending strain than monolithic wire. Instead of the highest Jw for CTC, it offer also high surface to volume ratio, which is important parameter for efficient cooling and thermal stability. The measurement of the resistance to tensile strain has shown the best performance for monolithic wire and the lowest irreversible strain for CTC.