After two years of maintenance and repairs the Large Hadron Collider (LHC) is ready to start up again, this time at 13 TeV - almost double its previous energy. This new energy frontier will allow researchers to probe new boundaries in our understanding of the fundamental structure of the universe.

About the LHC

The Large Hadron Collider is the world's largest and most powerful particle accelerator. Find out more about how this amazing machine works. 

Read more about the LHC

Safety of the LHC

CERN takes safety seriously. This report by the LHC Safety Assessment Group (LSAG) confirms that LHC collisions present no danger and that there are no reasons for concern.

Read about the safety of the LHC

LHC Season 2

In the section below you will find background information about the how the LHC has been prepared for higher energy, and what the restart will mean for physics research at CERN.