Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service One of the three giant tunnel

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Editorial use only. This image may not be used to state or imply endorsement by CERN of any product, activity or service 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, centre, cern, collid, construction, electron-positron, european, geneva, laboratory, large, lep, machine, nuclear, particle, physics, research, switzerland, tunnelling