High Voltage System for the CMS Electromagnetic Calorimeter

The CMS electromagnetic calorimeter (ECAL) is made of about 75000 lead tungstate crystals. The 61200 crystals of the barrel part are read by avalanche photodiodes (APD) with internal amplification of the signal. Since the gain strongly depends on the bias voltage, the APDs require a very stable powe...

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Detalles Bibliográficos
Autores principales: Bartoloni, Alessandro, Barone, Luciano, Cavallari, Francesca, Dafinei, Ioan, Del Re, Daniele, Diemoz, Marcella, Guerra, Sergio, Longo, Egidio, Meridiani, Paolo, Organtini, Giovanni, Palma, Alessandro, Paramatti, Riccardo, Pellegrino, Fabio, Rahatlou, Shahram, Rovelli, Chiara, Santanastasio, Francesco
Lenguaje:eng
Publicado: 2007
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/1027033
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author Bartoloni, Alessandro
Barone, Luciano
Cavallari, Francesca
Dafinei, Ioan
Del Re, Daniele
Diemoz, Marcella
Guerra, Sergio
Longo, Egidio
Meridiani, Paolo
Organtini, Giovanni
Palma, Alessandro
Paramatti, Riccardo
Pellegrino, Fabio
Rahatlou, Shahram
Rovelli, Chiara
Santanastasio, Francesco
author_facet Bartoloni, Alessandro
Barone, Luciano
Cavallari, Francesca
Dafinei, Ioan
Del Re, Daniele
Diemoz, Marcella
Guerra, Sergio
Longo, Egidio
Meridiani, Paolo
Organtini, Giovanni
Palma, Alessandro
Paramatti, Riccardo
Pellegrino, Fabio
Rahatlou, Shahram
Rovelli, Chiara
Santanastasio, Francesco
author_sort Bartoloni, Alessandro
collection CERN
description The CMS electromagnetic calorimeter (ECAL) is made of about 75000 lead tungstate crystals. The 61200 crystals of the barrel part are read by avalanche photodiodes (APD) with internal amplification of the signal. Since the gain strongly depends on the bias voltage, the APDs require a very stable power supply system. To preserve the high energy resolution of the calorimeter, a stability of the bias voltage of the order of 10^-4 is required over several months, a typical interval between absolute calibrations of the full read-out chain with physics events. This paper describes the High Voltage power supply system developed for CMS ECAL and its performances as measured in laboratory tests and during test-beam operations of several modules of the calorimeter.
id cern-1027033
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2007
record_format invenio
spelling cern-10270332019-09-30T06:29:59Zhttp://cds.cern.ch/record/1027033engBartoloni, AlessandroBarone, LucianoCavallari, FrancescaDafinei, IoanDel Re, DanieleDiemoz, MarcellaGuerra, SergioLongo, EgidioMeridiani, PaoloOrgantini, GiovanniPalma, AlessandroParamatti, RiccardoPellegrino, FabioRahatlou, ShahramRovelli, ChiaraSantanastasio, FrancescoHigh Voltage System for the CMS Electromagnetic CalorimeterDetectors and Experimental TechniquesThe CMS electromagnetic calorimeter (ECAL) is made of about 75000 lead tungstate crystals. The 61200 crystals of the barrel part are read by avalanche photodiodes (APD) with internal amplification of the signal. Since the gain strongly depends on the bias voltage, the APDs require a very stable power supply system. To preserve the high energy resolution of the calorimeter, a stability of the bias voltage of the order of 10^-4 is required over several months, a typical interval between absolute calibrations of the full read-out chain with physics events. This paper describes the High Voltage power supply system developed for CMS ECAL and its performances as measured in laboratory tests and during test-beam operations of several modules of the calorimeter.CMS-NOTE-2007-009oai:cds.cern.ch:10270332007-04-02
spellingShingle Detectors and Experimental Techniques
Bartoloni, Alessandro
Barone, Luciano
Cavallari, Francesca
Dafinei, Ioan
Del Re, Daniele
Diemoz, Marcella
Guerra, Sergio
Longo, Egidio
Meridiani, Paolo
Organtini, Giovanni
Palma, Alessandro
Paramatti, Riccardo
Pellegrino, Fabio
Rahatlou, Shahram
Rovelli, Chiara
Santanastasio, Francesco
High Voltage System for the CMS Electromagnetic Calorimeter
title High Voltage System for the CMS Electromagnetic Calorimeter
title_full High Voltage System for the CMS Electromagnetic Calorimeter
title_fullStr High Voltage System for the CMS Electromagnetic Calorimeter
title_full_unstemmed High Voltage System for the CMS Electromagnetic Calorimeter
title_short High Voltage System for the CMS Electromagnetic Calorimeter
title_sort high voltage system for the cms electromagnetic calorimeter
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/1027033
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