Identity area
Reference code
Heritage collection CERN-OBJ-CERN-OBJ-DE-056
Title
OPAL Central Detector (Including vertex, jet and Z chambers)
Date(s)
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Item
Extent and medium
Object
Context area
Repository
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Immediate source of acquisition or transfer
Content and structure area
Scope and content
OPAL was one of the four experiments installed at the LEP particle accelerator from 1989 - 2000. OPAL's central tracking system consists of (in order of increasing radius) a silicon microvertex detector, a vertex detector, a jet chamber, and z-chambers. All the tracking detectors work by observing the ionization of atoms by charged particles passing by: when the atoms are ionized, electrons are knocked out of their atomic orbitals, and are then able to move freely in the detector. These ionization electrons are detected in the different parts of the tracking system. (This piece includes the vertex, jet and Z chambers) In the picture above, the central detector is the piece being removed to the right.
Appraisal, destruction and scheduling
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Public
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Physical characteristics and technical requirements
4.5m 4m 20 tons
Finding aids
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Existence and location of originals
Available, .
Existence and location of copies
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Alternative identifier(s)
CDS number
43977
Object Number
OBJOBJ 0000256
