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Would dumping enormous amounts of liquid nitrogen cool it quickly thus extinguishing it? Could a bomb disperse the fuel preventing fusion? Could adding a material stop the fuel from fusing? Is there another method?

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  • $\begingroup$ Under what conditions? $\endgroup$ – Jon Custer Apr 1 at 18:26
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    $\begingroup$ I'm not super savvy on the Navier-Stokes and other magnetohydrodynamics, but I would imagine turning off the confinement field would do this relatively quickly whether it's magnetic or laser based, or in a muon catalyzed case, quit feeding the fuel muons. If it's gravitationally confined like the sun, you might have problems. $\endgroup$ – R. Rankin Apr 1 at 19:31
  • $\begingroup$ Did you actually mean to ask about stopping a fission reaction, like the runaway reactor failures at Chernobyl or Fukushima? If so, since you already have an answer about fusion, you should ask a follow-up question. $\endgroup$ – rob Apr 2 at 14:27
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To sustain fusion, tremendous pressures and temperatures are required. all you need to do to almost instantly stop a fusion reactor is to release the pressure on the plasma/fuel mix.

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  • $\begingroup$ Fusion is not a chain reaction: it is enough to stop the injection of deuterium or tritium fuel for the reaction to stop. $\endgroup$ – Jean Jacques Apr 2 at 6:37

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