Multifllamentary MgB2 wire was used to construct three coils that were tested for transport Jc and magnetic field in the bore between 4.2 K and 30 K. The solenoid coil achieved 85 A at 4.2 K with 3.9 T in a 3.8 cm bore. A racetrack

摘要

Multifllamentary MgB2 wire was used to construct three coils that were tested for transport Jc and magnetic field in the bore between 4.2 K and 30 K. The solenoid coil achieved 85 A at 4.2 K with 3.9 T in a 3.8 cm bore. A racetrack coil was also fabricated with an attached compression plate to test the effects of compressive stress on an MgB2 racetrack coil. At compressive stresses up to 52 MPa, no degradation was observed in transport Jc at 20 K. A react and wind coil with a 56 cm bore and 828 m of MgB2 wire was also tested for transport Jc and magnetic field in the bore to demonstrate the feasibility of the react and wind process. At 5 K, the react and wind coil achieved 168 A and 0.17 T.