Images Dated 19th March 2003

ATLAS detector module

ATLAS detector module under construction. ATLAS is a detector at the Large Hadron Collider (LHC) at CERN, the European particle physics laboratory near Geneva, Switzerland. ATLAS, the size of a 5- storey building, is being built around part of the 27-kilometre-long underground ring of the LHC. The LHC will accelerate proton beams to collide in the space seen. The collision energy will create new particles whose decay products radiate out through the detector layers. Here, a yellow support cradle holds the Barrel Liquid Argon Calorimeter that can detect photon and electron energies. It is thought that ATLAS will detect the Higgs particle when the LHC starts operating in 2007

© DAVID PARKER/SCIENCE PHOTO LIBRARY

ALICE detector magnets

ALICE detector magnets during construction. ALICE is "A Large Ion Collider Experiment" for the Large Hadron Collider (LHC), CERN (the European particle physics laboratory) near Geneva, Switzerland. The internal space (full of scaffolding) will contain the rest of the detector which will be inserted by opening the magnet doors seen. The central hole in the doors will allow ALICE to be placed around part of the 27-kilometre-long underground LHC ring that will accelerate ion beams to collide head-on. The collision energy will create new particles whose decay products will be detected. A magnet is required to detect charged particles. The LHC is scheduled to start operating in 2007

© DAVID PARKER/SCIENCE PHOTO LIBRARY