Large Hadron Collider

Construction of LHC at CERN
The Large Hadron Collider (short LHC) is a particle accelerator and collider located at CERN. It is currently under construction and scheduled to start operation in 2007. It uses the 27km circumference tunnel created for the Large Electron Positron (LEP) collider. In contrast to the previous it will collide protons (one type of hadron particle) instead of electrons and positrons. The protons used will have an energy of 7 TeV each. Four experiments will be built to utilize the LHC. Two of them, ATLAS and CMS are large, "general purpose" particle detectors. The other two, LHCb and ALICE are smaller and more specialized.
The LHC can also be used to collide heavy ions such as lead (Pb).
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