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Abstract:
The SPARC Toroidal Field Model Coil (TFMC) Project was a three-year project that developed novel Rare Earth Yttrium Barium Copper Oxide (REBCO) superconductor technologies and then successfully utilized these technologies to design, build, and test a first-in-class, high-field, representative-scale fusion magnet. Weighing 9,270 kg (20,430 lb) and utilizing a record 270 km (168 mi) of REBCO superconductor, the TFMC achieved 20.3 T peak field-on-coil at a current of 40.5 kA and stored magnetic energy of 110 MJ. To execute the TFMC tests, a new magnet test facility was built and commissioned at the MIT Plasma Science and Fusion Center (PSFC), which included several novel approaches to the large-scale superconducting magnet such a set of 50 kA liquid nitrogen cooled binary current leads and a liquid-free supercritical helium circulation system providing 600 W of cooling power at 20 K. This talk will provide a high-level overview of the TFMC Project, focusing on the magnet, enabling test facility technologies, and testing results, as well as highlighting the impacts for compact fusion energy device design now enabled by the first demonstration of fusion-scale high-field RECBO magnets.