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The tunnelling machine used to excavate the tunnel for the Super-Proton-Synchrotron (SPS) accelerator at CERN, the European particle physics laboratory outside Geneva, in 1975. The accelerator, beneath French & Swiss farmland, forms a ring 7 km in circumference. In the 1980s, it was modified to operate as a collider, with protons travelling in one direction, antiprotons in the opposite direction.
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