Skunk Works Reveals Compact Fusion Reactor Details
This looks like a real thermal engineering challenge in one respect. The superconductive magnet coils are exposed to the neutron flux that transfers fusion reaction energy to the absorptive thermal blanket. I don't know offhand the neutron cross-sections of likely superconductor materials at whatever neutron energy spectrum this reactor will produce, but I suspect energy absorption by the magnet structure won't be small. I wonder how they plan to keep the magnets cold. Never mind the other effects on materials of high-flux neutron absorption.