Speaker
Description
It was a milestone to generate a record-high DC field of 45.5 T by use of a 14.4 T no-insulation (NI) REBCO insert, named Little Big Coil (LBC), operated in a 31.1 T resistive background magnet by the National High Magnetic Field Laboratory. The engineering current density of the NI REBCO insert was ~1200 A/mm2 at 45.5 T, nearly 6 times larger than that of the conventional insulated HTS coils, ~200 A/mm2, yet LBC did not experience electric burn-out upon a quench. However, it did experience various patterns of mechanical damages, which delivered us some insights to deepen our understanding of causes and mechanisms on the mechanical damages in ultra-high field HTS magnets. In this paper, we first summarize the state-of-the-art NI HTS magnet technology and its widespread applications beyond the high field laboratory magnets. Then we will discuss about recent lessons that we learned regarding the potential causes and the mechanisms on the mechanical damages in high field HTS magnets, not limited to NI.
Acknowledgement
This work was supported by the National High Magnetic Field Laboratory (which is supported by the National Science Foundation under NSF/DMR-1644779,DMR-1839796), and by the State of Florida. This work was also partly supported by the National Research Foundation of Korea as a part of Mid-Career Research Program (No. 2018R1A2B3009249) and the Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-IT1801-09.
