LHC ACCESS SYSTEM: FROM DESIGN TO OPERATION

摘要

The paper describes the LHC access system project, the system's architecture and the experience gathered of commissioning it. This system is made of two parts: the LHC Access Control System and the LHC Access Safety System. Using state of the art redundant, fail-safe PLC's and a supplementary, cabled control loop the LHC Access Safety System guarantees the safety of the personnel against the risk of unwanted radiation exposure. Using industrial components, the LHC Access Control System, regulates the access to the tunnels and experimental areas by identifying the users and controlling their access authorisations. It allows a remote or automatic operation of the access control equipment, restricting the number of users working simultaneously in the interlocked areas. A first implementation of the architecture is now in production and ensures that only authorized personnel can enter the controlled areas of the LHC complex and this only after permission has been given by the CERN Control Centre.