Fusion power is useless unless the power is harnessed to produce work as in electricity or propulsion.
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Correct me if I’m wrong but wouldn’t a sustained plasma reaction provide the continuous generation of HEAT?
Like burning coal or gasoline or natural gas. I don’t believe that the heat to electric power process is going to.be a limiting factor.
But that sustained reaction... now that is a real problem.
Well, that is part of the problem.
A sustained fusion reaction requires that the heat in the chamber remain at or above a certain level (don’t ask me)
Exporting heat to boil water is removing heat. Removing that heat at too great a rate could extinguish the chain reaction. Balancing the fuel feed and heat bleed may be a difficult problem
Too much fuel may damage your boiler tubes too little fuel and your reaction is extinguished.