Largest particle accelerator in the world.
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"Jacques Lefrancois, Jack Steinberger, Lorenzo Foa, Pierre Lazeyras and ALEPH - one of 4 LEP detectors. LEP is the largest particle accelerator in world. Switched on in 1989, it is buried 100m underground inside a tunnel 27 km round and first carried Z particles (carriers of one of nature's fundamental forces). In 1995 LEP2 started to produce and study W particles. Detectors are used to measure properties of particles. Some measure tracks left behind by particles and others measure energy. Founded in 1954, CERN is the world's leading particle"