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

The CMS Electromagnetic Calorimeter is made of scintillating lead tungstate crystals, using avalanche photodiodes (APD) as photo-detectors in the barrel part. The high voltage system, consisting of 1224 channels, biases groups of 50 APD pairs, each at a voltage of about 380 V. The APD gain dependen...

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Detalles Bibliográficos
Autor principal: Marzocchi, Badder
Lenguaje:eng
Publicado: 2017
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/2286796
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author Marzocchi, Badder
author_facet Marzocchi, Badder
author_sort Marzocchi, Badder
collection CERN
description The CMS Electromagnetic Calorimeter is made of scintillating lead tungstate crystals, using avalanche photodiodes (APD) as photo-detectors in the barrel part. The high voltage system, consisting of 1224 channels, biases 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-2286796
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling cern-22867962019-09-30T06:29:59Zhttp://cds.cern.ch/record/2286796engMarzocchi, BadderHigh precision, low disturbance calibration of the High Voltage system of the CMS Barrel Electromagnetic CalorimeterDetectors and Experimental TechniquesThe CMS Electromagnetic Calorimeter is made of scintillating lead tungstate crystals, using avalanche photodiodes (APD) as photo-detectors in the barrel part. The high voltage system, consisting of 1224 channels, biases 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-2017-281oai:cds.cern.ch:22867962017-09-22
spellingShingle Detectors and Experimental Techniques
Marzocchi, Badder
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 http://cds.cern.ch/record/2286796
work_keys_str_mv AT marzocchibadder highprecisionlowdisturbancecalibrationofthehighvoltagesystemofthecmsbarrelelectromagneticcalorimeter

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