Laurent Guiraud CERN Courier vol 39 no 6 : July 1999 Large Electron-Positron Collider LEP Spectrometer Magnet Dipole Tunnel 1999 1999 This view of the inside of the Large Electron-Positron (LEP) collider tunnel shows a special dipole magnet that was used to measure the energy of the accelerated particles. Large Electron-Positron Collider LEP Magnet Dipole Diagram 1991 1991 LEP used a revolutionary design of dipole magnet, having magnetic plates embedded in an iron-concrete yoke. Such magnets bend the beam around its circular path. A vacuum is maintained throughout the accelerator so that the beam remains stable by avoiding unwanted interactions. Large Electron-Positron Collider LEP Tunnel 1989 1989 This is an image of the tunnel housing the LEP collider 100 m below the Swiss-France border. Due to the huge circumference of the tunnel it appears to be almost straight. Large Electron-Positron Collider LEP Radio Frequency Cavity Superconducting Diagram LEP2 RF 1991 1991 This diagram gives a schematic representation of the superconducting radio-frequency cavities at LEP. Liquid helium is used to cool the cavity to 4.5 degrees above absolute zero so that very high electric fields can be produced, increasing the operating energy of the accelerator. Superconducting cavities were used only in the LEP-2 phase of the accelerator, from 1996 to 2000. AC Team United Kingdom Outreach : Picture of the Week ATLAS LHC Detector Installation Point 1 Site 1999 1999 This diagram shows the locations of the four main experiments (ALICE, ATLAS, CMS and LHCb) that will take place at the LHC. Located between 50 m and 150 m underground, huge caverns have been excavated to house the giant detectors. The SPS, the final link in the pre-acceleration chain, and its connection tunnels to the LHC are also shown. AC Team CNRS Thema : le CNRS à l'heure de l'Europe n°1 2e trimestre 2003 "l'Europe de la recherche" LEP LHC Detector Installation Detector Site ATLAS Best Site milestones 2001 2001 The area under which the tunnel for CERN's LHC can be found is shown near to Geneva and lac Leman. The French Alps with Mont Blanc can be seen in the background. Jean-Luc Caron CERN Bulletin 27/2004 LHC SPS LINAC PS ISOLDE AD - Antiproton Decelerator CNGS n-ToF 2001 2001 CERN Courier vol 38 no 7 : October 1998 LEP 1989 1989 The hundreds of mirrors around this Ring Imaging Cherenkov Chamber reflect cones of light created by fast moving particles to a detector. The velocity of a particle can be measured by the size of the ring produced on the detector. DELPHI, which ran from 1989 to 2000 on the LEP accelerator, was primarily concerned with particle identification. LEP machine 1989 1989