Design and Testing of Terminals for REBCO Coils of 32 T All Superconducting Magnet

The 32 T all superconducting magnet currently being developed at the NHMFL will contain two REBCO insert coils located within an outsert of several LTS coils. The REBCO coils will experience high stress levels, radial expansion, and axial compression as the coils are energized. Therefore, great consideration has been given to the method by which current enters and exits the coils. Terminals and terminal constraints have been designed to achieve low resistance and high strength, while allowing for necessary movement of the coil and reliable attachment practices. These designs have been fabricated and tested, both as stand-alone tests and on prototype coils, to demonstrate the desired performance characteristics. The general design features are discussed, fabrication procedures are described, and the results of testing at high stress are presented.