Abstract
We investigated critical current density (Jc) characteristics of commercial REBCO tapes of four manufacturers at temperatures between 30 and 77K in magnetic fields up to 5T. We first examined variation in the Jc characteristics of two Zr-doped REBCO tapes (SuperPower) of the same specifications, which are found to be quite different, indicating that the in-field Jc characteristics due to artificial pinning centers vary among spools or along the length of tape.We then investigated in-field performances of four different commercial REBCO tapes (AMSC, Fujikura, SuNAM, SuperPower), calculating performances of coils using their magnetic-field angle dependences of Jc. The REBCO tapes are found to give very different in-field performances depending on the strength and direction of field they experience, and their relative superiority is observed to vary with temperature.
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