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Phase1 upgrade of the CMS-HF Calorimeter

In this presentation, results of the Phase I upgrade of the CMS Hadron Forward Calorimeter (HF) are discussed. The CMS-HF Calorimeter was using regular PMTs. Cherenkov light produced in the quartz fibers embedded in the iron absorber was read out with the PMTs. However, occasionally, stray muons hit...

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Detalles Bibliográficos
Autor principal: Gulmez, Erhan
Lenguaje:eng
Publicado: 2016
Materias:
Acceso en línea:https://dx.doi.org/10.22323/1.276.0194
http://cds.cern.ch/record/2197525
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author Gulmez, Erhan
author_facet Gulmez, Erhan
author_sort Gulmez, Erhan
collection CERN
description In this presentation, results of the Phase I upgrade of the CMS Hadron Forward Calorimeter (HF) are discussed. The CMS-HF Calorimeter was using regular PMTs. Cherenkov light produced in the quartz fibers embedded in the iron absorber was read out with the PMTs. However, occasionally, stray muons hitting the PMT windows cause Cherenkov radiation in the PMT itself and produce large signals. These large signals mimic a very high-energy particle and are tagged as important by the trigger. To reduce this problem, PMTs had to be replaced. The four-anode PMTs that were chosen have thinner windows; thereby reducing the Cherenkov radiation in the PMT window. As part of the upgrade, the read-out electronics is to be replaced so that the PMTs are read out in two channels by connecting each pair of anodes to a single channel. Information provided by these two channels will help us reject the false signals due to the stray muons since the Cherenkov radiation in the PMT window is more likely to produce a signal only in one anode as opposed to a real signal whose light illuminates all four anodes.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
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spelling cern-21975252019-09-30T06:29:59Zdoi:10.22323/1.276.0194http://cds.cern.ch/record/2197525engGulmez, ErhanPhase1 upgrade of the CMS-HF CalorimeterDetectors and Experimental TechniquesIn this presentation, results of the Phase I upgrade of the CMS Hadron Forward Calorimeter (HF) are discussed. The CMS-HF Calorimeter was using regular PMTs. Cherenkov light produced in the quartz fibers embedded in the iron absorber was read out with the PMTs. However, occasionally, stray muons hitting the PMT windows cause Cherenkov radiation in the PMT itself and produce large signals. These large signals mimic a very high-energy particle and are tagged as important by the trigger. To reduce this problem, PMTs had to be replaced. The four-anode PMTs that were chosen have thinner windows; thereby reducing the Cherenkov radiation in the PMT window. As part of the upgrade, the read-out electronics is to be replaced so that the PMTs are read out in two channels by connecting each pair of anodes to a single channel. Information provided by these two channels will help us reject the false signals due to the stray muons since the Cherenkov radiation in the PMT window is more likely to produce a signal only in one anode as opposed to a real signal whose light illuminates all four anodes.CMS-CR-2016-145oai:cds.cern.ch:21975252016-06-28
spellingShingle Detectors and Experimental Techniques
Gulmez, Erhan
Phase1 upgrade of the CMS-HF Calorimeter
title Phase1 upgrade of the CMS-HF Calorimeter
title_full Phase1 upgrade of the CMS-HF Calorimeter
title_fullStr Phase1 upgrade of the CMS-HF Calorimeter
title_full_unstemmed Phase1 upgrade of the CMS-HF Calorimeter
title_short Phase1 upgrade of the CMS-HF Calorimeter
title_sort phase1 upgrade of the cms-hf calorimeter
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.22323/1.276.0194
http://cds.cern.ch/record/2197525
work_keys_str_mv AT gulmezerhan phase1upgradeofthecmshfcalorimeter