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US scientists achieve net energy gain for second time in a fusion reaction
(www.theguardian.com)
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this post was submitted on 07 Aug 2023
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Technology
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I wouldn't say never, but you're right that we should measure the system based on it's output once it starts running. The important thing is to prove that the concept can be net positive. If you can get a long enough life out of it then the manufacturing impacts are negligible