PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Computer-generated tracks of simulated showers of subatomic particles are overlaid on a view 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 centaral detector can be seen in the upper right corner of the picture. Photo taken April 1989.
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