Tests show high-temperature superconducting magnets are ready for fusion

https://news.mit.edu/2024/tests-show-high-temperature-superconducting-magnets-fusion-ready-0304

"record 20 tesla magnetic field strength... like Tokamak, but reduces cost/ watt almost 40X, reduced size... 20K-pound magnet producing highly stable, even magnetic field just >20 tesla... 16 plates each bearing spiral superconducting tape winding on 1 side and cooling channels for helium gas on other... no-insulation (-270°C rare-earth barium copper oxide's much greater conductivity enables lower voltage, more compact), no-twist coil... 186 miles of high-temperature superconductor integrated into magnet"