A look at the damage that halted the Large Hadron Collider

This picture shows damage to the support of one of the quadruple magnets in sectors three to four. The LHC uses quadruple magnets to focus opposing proton beams, and dipole magnets to keep the beams on their respective paths.

This picture shows the site of the electrical fault that caused the helium leak. A resistive zone developed in one of the electrical connections, creating an electrical arc that punctured one of the helium enclosures around a magnet, according to an analysis by Cern. The warming helium expanded in the vacuum enclosure of the central sub-sector of the pipe, damaging the vacuum barriers separating the central sub-sector from the neighbouring sub-sectors.

A faulty electrical connection between two magnets (shown in red) is believed to be the cause of the incident in sector 3-4 of the Large Hadron Collider on September 19.

A technician is making final preparations to replace a magnet that was the cause of the damage to the Large Hadron Collider.