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That's the point of research: figuring out those things. If ITER does not work at all, the current roadmap to fusion power plants is dead. Stellarators might get some attention, but I don't think they will get a lot of money then. If ITER works, DEMO can be constructed.mheslep said:Clear road? It's not yet established that ITER can hold its plasma for the targeted 5 minutes, that sufficient tritium is bred, that the first wall does not suffer too much damage.
DEMO will be too expensive for a commercial power plant, but that is not the point - it is a research project. Science at DEMO can show what exactly is necessary for a commercial power plant, which leads to a proper cost estimate.