Does anyone know whether nuclear fusion energy gain numbers contain energy requirements for keeping the magnets cooled and the vacuum at high quality?
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Depends. If you get fueling and indirect current drive you can go for very long pulses. To my mind part of the problem with fusion is a tendency of the physicists to premature optimisation.
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Partly that’s budget driven. We might have been better with the original ITER design that could hit ignition with ohmic heating and no fancy turbulence suppression. Of course you can argue fusion is premature optimisation of nuclear power...
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