Construction of OPAL detector, CERN

Construction of OPAL detector, CERN

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Caption: Construction 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 layers of an onion around the point where the particles collide. OPAL's cylindrical central detector can be seen at lower right. To its left is a semi- cylinder of black lead glass blocks, partly covered by a white protective sheet, which will move in to fit snugly around the central detector. Photo taken April 1989.

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

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