Abstract

The status is given of the lead tungstate electromagnetic crystal calorimeter for the CMS detector at the Large Hadron Collider: calorimeter design, development of calorimeter components and results obtained in particle beams are discussed.

Highlights

  • The CMS collaboration is preparing a high-precision electromagnetic calorimeter (ECAL) for its detector

  • Beyond the benefit of a homogeneous calorimeter, Lead Tungstate has been chosen for several reasons

  • For the detection of the PbWO4 scintillation light in the ECAL barrel, Silicon Avalanche Photodiodes (APD) have been chosen, since they are insensitive to magnetic fields, allowing operation in the 4 Tesla CMS solenoidal field, and since they have some internal gain, as needed with the modest light yield produced by the crystals

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Summary

Introduction

The CMS collaboration is preparing a high-precision electromagnetic calorimeter (ECAL) for its detector. Beyond the benefit of a homogeneous calorimeter, Lead Tungstate has been chosen for several reasons It has a fast scintillation emission, with a light decay time which matches the LHC bunch crossing time of 25 ns. The design is based on modularity and on the use of high-strength, low-Z materials, where alveolar submodules of 2 × 5 fiberglass cells containing individual crystals are the smallest units. These submodules will carry a reflective inner coating, yielding intercrystal gaps of < 500 μm. The endcap ECAL covers the pseudorapidity region 1.48 | η |< 3.0

Crystal Development
Photodetectors and Readout
Floating Point Output Word
Calibration and Monitoring
Findings
Conclusions
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