LHC restart timeline
February 2015
The Large Hadron Collider is now cooled to nearly its operational temperature.
A first set of superconducting magnets has passed the test and is ready for the Large Hadron Collider to restart in spring.
Engineers and technicians have begun to close experiments in preparation for the next run.
March 2015
The Large Hadron Collider has overcome a technical hurdle and could restart as early as next week.
April 2015
The Large Hadron Collider has circulated the first protons, ending a two-year shutdown.
The Large Hadron Collider accelerated protons to the fastest speed ever attained on Earth.
May 2015
LHC sees first low-energy collisions
The Large Hadron Collider broke its own record again in 13-trillion-electronvolt test collisions.
June 2015
Data collection has officially begun at the Large Hadron Collider.