Tunnelling machine in LEP tunnel, CERN

Tunnelling machine in LEP tunnel, CERN

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Restrictions: Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service THIS PICTURE MUST NOT BE USED TO STATE OR IMPLY THE ENDORSEMENT BY CARN OF ANY COMPANY OR PRODUCT.

Caption: One of the three giant tunnelling machines used to dig the tunnel of the Large Electron-Positron collider (LEP) at CERN, the European particle physics laboratory. Scheduled to start operations in July 1989, LEP is housed in a circular tunnel 100m underground & 27km in circumference. LEP will accelerate counter- rotating bunches of electrons & positrons to an energy of 50 GeV. The bunches of particles will collide at 4 points around the ring where giant detectors will record their inter- actions. The tunnel was completed in 1988 after the removal of 1. 4 million cubic metres of earth.

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Keywords: accelerator, cern, construction, european centre for, geneva, large electron-positron collid, lep accelerator, nuclear research, particle physics laboratory, switzerland, tunnelling machine

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