There are no "magnets" at this point, so not sure what he is talking about. Basically they are building up HTS Twisted Stacked-Tape Cables (TSTC) and they plan on building their first full-size prototype coil in 2020.
Current tests include subjecting conductors to a 13T field in a 700mm chamber at the National Institute for Fusion Science (NIFS) in Japan. One of the key properties of HTS is that they maintain superconductivity at high magnetic fields.
Hi - could you pls point me to the source for this? Would be great to see actual data on where we are on these projects. thx