Why does then large hadron collider need helium?

Most superconductors only become superconducting at very cold temperatures, and liquid helium is a common coolant for superconducting magnets (which there are a lot of in the LHC). There are liquid nitrogen temperature superconductors, but as far as I know they're all fairly brittle and hard to make into wire, which limits their usefulness in constructing superconducting magnets.It's also possible that liquid helium might be used for cooling certain of the detectors.

Liquid helium is colder than anything else on the face of the Earth. They cool the magnets with helium so the wire they're made out of will superconduct - flow electricity with no resistance. The LHC's magnets use 1.5 million watts of power all tolled; imagine how much they would need if the wire had even a thousandth of an ohm per meter resistance!

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