The Large Hadron Collider collides protons. A good source of protons is Hydrogen, just strip the electrons off and away you go.
This little red bottle is their Hydrogen source. Not for a week or a year...that one bottle is enough for 200,000 years.

(Img: https://commons.wikimedia.org/wiki/User:Saintfevrier)

User:Saintfevrier - Wikimedia Commons

@_thegeoff a Mole is a lot of atoms.