Sure but it&#x27;s not mainly the R&amp;D, it&#x27;s the capital cost of such large, complex reactors. MIT&#x27;s ARC, to take the most conservative alternative, is also a tokamak, but with much stronger superconductors it can be built a lot smaller and cheaper.<p>MIT has a lot of experience in this area since they already have a tokamak with the strongest magnetic fields of any in the world. They&#x27;ve made at least one fundamental breakthrough with it, not too long ago. Of course Congress is about to cancel their funding.