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Working on the LHC tunnel, CERN

Working on the LHC tunnel, CERN

A105/0275

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Credit

ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY

Caption

Working on the LHC tunnel. Engineers analysing the complex circuitry inside the LHC (large hadron collider) at CERN (the European particle physics laboratory) near Geneva, Switzerland. The LHC is a 27-kilometre underground ring of superconducting magnets housed in this pipe-like structure (top), or cryostat. The cryostat is cooled by liquid helium to keep the operating temperature at just above absolute zero. The LHC works by accelerating two counter-rotating beams of protons to an energy of 7 tera electron volts (TeV). It then forces these beams to collide head-on near two main detectors, known as the CMS (Compact Muon Solenoid) and ATLAS (A Toroidal LHC Apparatus), which detect the sub-atomic particles resulting from the collision. The LHC is scheduled to start operating in May 2008.

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