CERN's Large Hadron Collider officially completes scientific operations ahead of major upgrade. The world's largest particle accelerator will undergo a four-year transformation into the high-luminosity HL-LHC.

The Large Hadron Collider has officially completed its scientific operations following the shutdown of the world's largest particle accelerator, CERN's press service reported. During a four-year pause, the LHC will be radically upgraded into a new facility — the HL-LHC (High-Luminosity LHC).