Design of a 20 T Class REBCO Insert in a 15 T Low Temperature Superconducting Magnet

A 20 T REBCO insert magnet has been designed considering a 15 T/150 mm background field generated by an LTS magnet. A two-nested-coil structure was chosen. The target of this project is to generate a 20 T/80 mm user field by inserting the outer MI-REBCO coil (Coil 2) first, then try to reach 35 T by inserting the inner NI-REBCO test coil (Coil 1). Coil 2 will be wound by copper packed, 185-mu m thick REBCO tapes co-wound with 50-mu m thick Hastelloy tapes. Coil 1 will be no-insulated wound by 65-mu m thick REBCO tapes. Two mechanical models were built to estimate the stress distribution inside the HTS coils during operation. The influence of the screening current distribution on stress was discussed. The unbalanced force caused by the coil misalignment was also simulated. The 20 T HTS insert magnet is planned to be built and tested in 2021. The progress of coil winding and preliminary test results at 77 K were presented.

Automated summary

The project aims to design and build a 20 T REBCO insert magnet with a two-nested-coil structure to generate up to 35 T magnetic field. Mechanical models were developed to estimate stress distribution in HTS coils and simulation results were used to predict the performance of the insert magnet. The progress of coil winding and preliminary test results at 77 K were presented for further evaluation.