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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Replying to @skdh
usually not; the Q for ignition (5) is basically about the amount of energy absorbed by alpha particles directly, the physicists handwave away the magnet cooling and vacuum maintenance energy costs as something that asymptotes out; micro reactor people sometimes factor it in
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Replying to @DanielleFong @skdh
🤷🏻♀️ Retweeted Seb Tallents
this answer is also on point; they stick a factor of 2 on it to account for a buffer and conversion efficiency. might be more than needed tbh.https://twitter.com/SebTallents/status/1420794843022905351 …
🤷🏻♀️ added,
Seb Tallents @SebTallents
Replying to @SebTallents @skdh
this latter figure takes into account the power input into aux heating (as opposed to deposited into the plasma), magnets etc. This is why Q=10 is considered the target for breakeven - Q=10 roughly corresponds to estimate for a genuine full system breakeven.
10:52 AM - 29 Jul 2021
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