Wouldn’t it be cheaper and more feasible to build and try experimental reactors 10x smaller for research and development purposes and _then_ built the proper size when they are proven to be efficient?
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Many many small fusion reactors have been used to study fusion. None of them come anywhere near breakeven (where it gives back more energy than it cost to start), which is what they need for power generation. Fusion is a process which becomes more efficient as it gets larger, so if our goal is breakeven we have to go big.
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