[quote=@SimplyJohn]
<Snipped quote by Bonjour xx>
Are you sure that's not the liquid helium? I know @TheUnknowable was eager to run tests on his drilling idea.

<Snipped quote by TheUnknowable>
The problem with that idea is that the material you made the pipes out of would be a better heat dissipator than the helium it was being used to pump. Why not just ram slabs of that stuff into the star and use it as a giant heat sink instead? That would help stabilize the reactions in the same way as dropping a carbon rod into a fission reactor.
[/quote]

If you ran it into the star it would keep the heat in the star.  With the liquid helium thing you could remove the heat from the star.  But if you just want to dump stuff into it until it cools down, why not a planet, or an entire belt worth of carbonaceous condrites and nickel/iron asteroids, sense all of those release far less energy when fused than hydrogen and helium.