Experimental study on critical current of bent ReBCO tapes in CORC type cable

Cabling the ReBCO conductor on a round core (CORC) has potential of application for future fusion magnets to carry high current and generate high magnetic field. However, the tape needs to experience the combined tension, compression, bending and torsion stresses during magnet manufacturing. In order to understand the stress effect on the critical current of ReBCO tape with a substrate thickness of 0.05 mm and width of 3 mm, one and multi- layers of CORC specimens have been prepared and bent with a diameter ranging from 300 mm to 60 mm. Critical current measurements were carried out on the tapes located on the outermost layer at 77 K and self-field. The aim is to check the response of the tape's critical current with respect to the cable bending diameter. Simultaneously, a small 2-turn solenoid was constructed and measured at 77 K and self-field to check whether it affect by the cable length or not. These CORC cables are flexible and most of the wound tapes on cable retain around 90% of their initial critical current after bending to a diameter of 100 mm. It will provide parameter support for design of insert solenoid magnets in the future.