Pinch fusion reactor
From Halopedia, the Halo wiki
Pinch Fusion Generators are a form of power generators that can be found on board Covenant warships.[1] They are likely used to generate power in other machines or structures, yet this is currently undetermined to be true. They use Tritium as fuel, and are presumably more advanced than UNSC Fusion Reactors. If their cooling systems are disabled or their maximum heat loads are exceeded, they can often fail explosively providing a detonation on the scale of UNSC warship fusion reactors.
