Large Hadron Collider

Initial capital letters. Always spell out first time (except in the CERN Courier), with abbreviation in brackets. Use the abbreviation thereafter.

Experiments at the Large Hadron Collider (LHC) suggest...

Beware of tautologies: Don't use "The LHC machine" or "The LHC accelerator", as this is equivalent to saying "The Large Hadron Collider accelerator...", which doesn't mean anything (the LHC doesn't accelerate accelerators).

LHC Experiments Committee

Large Hadron electron Collider

With a "c" when it's a noun; with an "s" when it's a verb. 

I always carry my driving licence with me for identification.

The government has agreed to license the sale of firearms.