Download - Lead tungstate crystal s
Lead tungstate crystalsVacuum Phototriode
Endcap SupercrystalHolds 25 crystals and VPTs
Lead tungstate crystalsDense material that stops electrons and photons. Emits scintillation lightThe endcap calorimeter contains 14648 crystals
Vacuum Phototriode (VPT) Detects scintillation light from the crystals. Converts to electrical signals
Endcap SupercrystalMechanical structure supporting a group of 25 crystals and VPTsa) Carbon Fibre Alveolar – supports
fragile crystals and VPTs.b) VPT Inserts – hold VPTs in placec) Interface plate: provides structural
rigidity to Crystal/VPT/Alveolar unit.
Background image: half of one endcap of the Electromagnetic Calorimeter, consisting of a matrix of 3662 crystals
Elements of the CMS Endcap Electromagnetic CalorimeterA HIGH-RESOLUTION CRYSTAL CALORIMETER DESIGNED TO DISCOVER THE HIGGS BOSON
The Endcap Calorimeter Project:International collaboration with project leadership provided by RAL PPDMechanical design and engineering provided by RAL Technology DepartmentStrong collaboration and partnership with UK Industry
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Elements of an endcap supercrystal(a) Carbon Fibre alveolar, (b) VPT inserts, (c) Interface plate
Also shown: d) Crystal + VPT, e) Optical Fibres, f) High Voltage housing
Rear viewShowing alveolar, VPT wires emerging through
25 VPT inserts
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