The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter

CMS is one of the four experiments being constructed for the LHC. The electromagnetic calorimeter (ECAL) is made of lead tungstate (PbWO4) crystals. Scintillation light from the crystals in the barrel is detected by avalanche photo diodes (APD). The number of scintillation photons emitted by the cry...

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Detalles Bibliográficos
Autor principal: Teller, O
Lenguaje:eng
Publicado: 2007
Materias:
Detectors and Experimental Techniques
Engineering
Acceso en línea:https://dx.doi.org/10.1109/TNS.2007.906169
http://cds.cern.ch/record/1063357
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author Teller, O
author_facet Teller, O
author_sort Teller, O
collection CERN
description CMS is one of the four experiments being constructed for the LHC. The electromagnetic calorimeter (ECAL) is made of lead tungstate (PbWO4) crystals. Scintillation light from the crystals in the barrel is detected by avalanche photo diodes (APD). The number of scintillation photons emitted by the crystals and the amplification of the APD are both temperature dependent. Keeping the constant term of the energy resolution (the contribution to the fractional energy resolution which is independent of energy) below a few tenths of percent requires the temperature of crystals and APDs to be stabilized to within 0.057 K. In this contribution, we describe the innovative solutions which have been developed and implemented to achieve this performance.
id cern-1063357
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2007
record_format invenio
spelling cern-10633572019-09-30T06:29:59Zdoi:10.1109/TNS.2007.906169http://cds.cern.ch/record/1063357engTeller, OThe design of the cooling system for the CMS Barrel Electromagnetic CalorimeterDetectors and Experimental TechniquesEngineeringCMS is one of the four experiments being constructed for the LHC. The electromagnetic calorimeter (ECAL) is made of lead tungstate (PbWO4) crystals. Scintillation light from the crystals in the barrel is detected by avalanche photo diodes (APD). The number of scintillation photons emitted by the crystals and the amplification of the APD are both temperature dependent. Keeping the constant term of the energy resolution (the contribution to the fractional energy resolution which is independent of energy) below a few tenths of percent requires the temperature of crystals and APDs to be stabilized to within 0.057 K. In this contribution, we describe the innovative solutions which have been developed and implemented to achieve this performance.oai:cds.cern.ch:10633572007
spellingShingle Detectors and Experimental Techniques
Engineering
Teller, O
The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter
title The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter
title_full The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter
title_fullStr The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter
title_full_unstemmed The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter
title_short The design of the cooling system for the CMS Barrel Electromagnetic Calorimeter
title_sort design of the cooling system for the cms barrel electromagnetic calorimeter
topic Detectors and Experimental Techniques
Engineering
url https://dx.doi.org/10.1109/TNS.2007.906169
http://cds.cern.ch/record/1063357
work_keys_str_mv AT tellero thedesignofthecoolingsystemforthecmsbarrelelectromagneticcalorimeter
AT tellero designofthecoolingsystemforthecmsbarrelelectromagneticcalorimeter

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