Technician in OPAL detector, CERN

Technician in OPAL detector, CERN

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Caption: A technician works on one of two end caps of the OPAL detector at CERN, the European centre for particle physics near Geneva. OPAL 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. OPAL is a cylindrical assembly of many types of apparatus which fit together like an onion around the point where the particles collide. The OPAL end caps consist of pre-shower counters (the "spokes" of the wheel) & electro-magnetic & hadron calorimeters. The technician is Martin Sproston of the Rutherford Appleton Laboratory in Britain. Photo taken April 1989.

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Keywords: ad quality, cern, detector, detector at, european centre for, geneva, lep collider, nuclear research, odyssey, opal detector, particle physics laboratory, switzerland

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