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The Large Hadron Collider shows its insides as upgrade work commences ( +11 photos)

The particle accelerator is scheduled to start up again in 2015

The LHC accelerates two beams of atomic particles -- which have a pipe of their own -- in opposite directions around the collider. They are enclosed in a sheath of superconducting magnets and all of this is bathed in liquid helium at -271.3 degrees Celsius. Before the beams enter one of the detectors the two tubes come together so they can collide.

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