The Large Hadron Collider (LHC) is stopping proton collisions for five days this week to undergo numerous tests. Accelerator specialists need to test the LHC when it is not in production mode and there are only several weeks left in which they can do it. At the end of the year, CERN’s accelerators will be shut down for a major two-year upgrade programme that will result in a renovated accelerator complex using more intense beams and higher energy. Scientists are conducting research to prepare for this new stage and the next, the High-Luminosity LHC.