Effect of metal core size on critical performance of REBCO tape for CORC cable

In order to promote the application of the ReBCO conductor on round core (CORC) cable to cable in conduit conductors (CICC) and high field magnets, it is of great importance to study the influence of metal core size on the critical performance of ReBCO tape for CORC cable. A number of single-layer CORC cable samples were hand-wound. The effects of the core size on critical current of YBCO tape for CORC cable are investigated at 77 K and in magnetic self-field. As the core size decreases, the critical current of the YBCO tape degenerates. When the cable core size is less than 4.3 mm, the critical current drops significantly. When the core size is 4mm, the critical current is 127A, the n value is 32.5, and the critical performance is reduced by 21%为推动圆芯型REBCO导体（ReBCO conductor on round core, CORC）电缆在导管内电缆导体（cable in conduit conductors, CICC）及高场磁体中的应用，研究金属芯尺寸对CORC电缆用REBCO带材临界性能的影响具有重要意义。本研究手工绕制了多组单层CORC电缆样品，并在77K自磁场环境下，探究了芯尺寸对CORC电缆用YBCO带材临界电流的影响规律。结果表明，随着芯尺寸减小，YBCO带材的临界电流出现退化；当电缆芯尺寸小于4.3mm时，临界电流显著下降。当芯尺寸为4mm时，临界电流为127A，n值为32.5，临界性能降低21%。