Identity area
Reference code
Heritage collection CERN-OBJ-CERN-OBJ-DE-057
Title
Array of lead-glass blocks from OPAL
Date(s)
Level of description
Item
Extent and medium
Object
Context area
Repository
Archival history
Immediate source of acquisition or transfer
Content and structure area
Scope and content
OPAL was one of the 4 experiments at CERN's Large Electron Positron collider (LEP) which ran from 1989 - 2000. This array of 96 lead glass bricks formed part of the OPAL electromagnetic calorimeter. In total, there were 9440 lead glass counters in the OPAL electromagnetic calorimeter, made of Schott type SF57 glass and each block weighs about 25 kg and consists of 76% PbO by weight. Each block has a Hamamatsu R2238 photomultiplier glued on to it. The complete detector was in the form of a cylinder 7m long and 6m in diameter. It was used to measure the energy of electrons and photons produced in LEP electron positron collisions.
Appraisal, destruction and scheduling
Accruals
System of arrangement
Conditions of access and use area
Conditions governing access
Public
Conditions governing reproduction
Language of material
Script of material
Language and script notes
Physical characteristics and technical requirements
1m 2m 5 tons
Finding aids
Allied materials area
Existence and location of originals
Available, 282.
Existence and location of copies
Related units of description
Notes area
Alternative identifier(s)
CDS number
43978
Object Number
OBJOBJ 0000257
