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Name of creator

BEBC Collaboration

Administrative history

The Big European Bubble Chamber (BEBC) Detector construction was started in 1967 by a consortium of German (University of Heildelberg DESY), French (Ecole Ploytechnique SACLAY) and CERN (Track Chamber Division) teams and the first pictures were taken in 1973.

The vessel of the Big European Bubble Chamber was installed at the beginning of the 1970s. The large stainless-steel vessel, measuring 3.7 metres in diameter and 4 metres in height, was filled with 35 cubic metres of liquid (hydrogen, deuterium or a neon-hydrogen mixture), whose sensitivity was regulated by means of a huge piston weighing 2 tonnes. During each expansion, the trajectories of the charged particles were marked by a trail of bubbles, where liquid reached boiling point as they passed through it. The first images were recorded in 1973 when BEBC, equipped with the largest superconducting magnet in service at the time, first received beam from the PS. In 1977 the bubble chamber was exposed to neutrino and hadron beams at higher energies of up to 450 GeV after the SPS came into operation.

The addition of the External Muon Identifier (EMI), the Internal Picket Fence (IPF), the External Particle Identifier (EPI) and a Track-Sensitive Target (TST) converted BEBC into a hybrid detector.

By the end of its active life in 1984, BEBC had delivered a total of 6.3 million photographs to 22 experiments devoted to neutrino or hadron physics. Around 600 scientists from some fifty laboratories throughout the world had taken part in analysing the 3000 km of film it had produced.

BEBC was dismantled in 1985.

* Source : Goldens Jubilee photos - BEBC the Big European Bubble Chamber. Issue N°20/2004. Mon 10th May 2004 - Bulletin Annual Report 1977, p 82 ; Annual Report 1984, p 64

Immediate source of acquisition or transfer

Charles Peyrou, leader of the Department of Physics II, Division Track Chamber (TC) from 1960 to 1974