Overhaul of BEBC

The long shutdown of the SPS (from mid of June to the end of 1980) was used for a complete overhaul of the BEBC subsystems, in particular of the refrigerator. Critical features of the chamber (welds, beam windows) were examined by an official inspectorate and pronounced satisfactory. The main modification was the installation of the IPF (Internal Picket Fence) to complement the External Muon Identifier (see Annual Report 1980, p.64). This photo shows well the superinsulation screening the body of the chamber (see also photo 8012668X ).