These injection tests are the final phase before the main test on 20 November in which particles will traverse across the entire ring. Actual collisions between two opposing beams should occur at roughly the same date.Over a 24-hour period on Monday, the sectors will be checked for radiation. Once the risk has been minimized, researchers and technicians will inspect the billion-dollar collider for any damage.The LHC will run at reduced power for the next two years, in an attempt to minimize risk to the magnets. Related News PicksBeam particles re-enter the LHCMore LHC news picksRelated LinksThe big bang at the LHCThe Guardian’s science correspondent Ian Sample talks to Lynn Evans, project manager of Cern’s Large Hadron Collider, who relives the moment he found out something had gone horribly wrong