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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.
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