The Large Hadron Collider will be switched off on June 29th for a refurb. This marks the beginning of "Long Shutdown 3," a major 4-year hiatus dedicated to dismantling parts of the CERN ring to upgrade it into the much more powerful High-Luminosity LHC. 

Joining Sean was James Keavney, Assistant Professor in the School of Physics at UCD 

Image: National Geographic