[condensedcrab]

The scaling laws for fusion follow a power law for size and magnetic field (see https://physics.stackexchange.com/questions/175830/nuclear-f...), which allow for better break even for commercial applications for larger fusion reactors like ITER. All of the smaller fusion reactors proposed need to use high Tc superconducting wire to generator higher magnetic fields for smaller reactors.

[DennisP]

And at the sizes CFS is building, we're already maxing out the structural strength of the reactors. We can't go much smaller with tokamaks, even if the superconductors get even better.