High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter

The CMS Electromagnetic Calorimeter utilizes scintillating lead tungstate crystals, with avalanche photodiodes (APD) as photo-detectors in the barrel part. 1224 HV channels bias groups of 50 APD pairs, each at a voltage of about 380 V. The APD gain dependence on the voltage is 3pct/V. A stability of...

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Detalles Bibliográficos
Autor principal: Fasanella, Giuseppe
Lenguaje:eng
Publicado: 2016
Materias:
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1088/1748-0221/12/01/C01090
http://cds.cern.ch/record/2238557
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author Fasanella, Giuseppe
author_facet Fasanella, Giuseppe
author_sort Fasanella, Giuseppe
collection CERN
description The CMS Electromagnetic Calorimeter utilizes scintillating lead tungstate crystals, with avalanche photodiodes (APD) as photo-detectors in the barrel part. 1224 HV channels bias groups of 50 APD pairs, each at a voltage of about 380 V. The APD gain dependence on the voltage is 3pct/V. A stability of better than 60 mV is needed to have negligible impact on the calorimeter energy resolution. Until 2015 manual calibrations were performed yearly. A new calibration system was deployed recently, which satisfies the requirement of low disturbance and high precision. The system is discussed in detail and first operational experience is presented.
id cern-2238557
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling cern-22385572019-09-30T06:29:59Zdoi:10.1088/1748-0221/12/01/C01090http://cds.cern.ch/record/2238557engFasanella, GiuseppeHigh precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic CalorimeterDetectors and Experimental TechniquesThe CMS Electromagnetic Calorimeter utilizes scintillating lead tungstate crystals, with avalanche photodiodes (APD) as photo-detectors in the barrel part. 1224 HV channels bias groups of 50 APD pairs, each at a voltage of about 380 V. The APD gain dependence on the voltage is 3pct/V. A stability of better than 60 mV is needed to have negligible impact on the calorimeter energy resolution. Until 2015 manual calibrations were performed yearly. A new calibration system was deployed recently, which satisfies the requirement of low disturbance and high precision. The system is discussed in detail and first operational experience is presented.CMS-CR-2016-273oai:cds.cern.ch:22385572016-10-22
spellingShingle Detectors and Experimental Techniques
Fasanella, Giuseppe
High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter
title High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter
title_full High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter
title_fullStr High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter
title_full_unstemmed High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter
title_short High precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic Calorimeter
title_sort high precision, low disturbance calibration of the high voltage system of the cms barrel electromagnetic calorimeter
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.1088/1748-0221/12/01/C01090
http://cds.cern.ch/record/2238557
work_keys_str_mv AT fasanellagiuseppe highprecisionlowdisturbancecalibrationofthehighvoltagesystemofthecmsbarrelelectromagneticcalorimeter

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