A technician works on one of the instruments inside the L3 detector at CERN, the European centre for particle physics near Geneva. L3 is one of 4 giant particle detectors at the LEP collider. LEP collides electrons & positrons accelerated to an energy of 50 GeV in a circular tunnel 100m underground & 27km in circumference. L3 is a cylindrical assembly of many types of apparatus which fit together like layers of an onion around the point where the particles collide. L3 is a collaboration of 460 physicists from 13 European & other countries, including China, India, the Soviet Union, & the USA. Photo taken April 1989.

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