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CERN detector. CERN worker in 1976, framed by the piston system for the Big European Bubble Chamber (BEBC). CERN, the European particle physics laboratory near Geneva, Switzerland, was founded in 1954. BEBC operated from 1973-1984. It was a large (3.7-metre-wide) bubble chamber, and contained a liquid gas that was destabilised by the creation of a vacuum by these large pistons. This allowed particles passing through the liquid to trigger the formation of bubbles. Millions of bubble chamber photographs were used to study the fundamental structure of matter. Bubble chambers are no longer used because they are too slow for the fast decays in modern particle physics.
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