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Contribution to the study of the readout of the electromagnetic calorimeter crystals in the CMS experiment at LHC; Contribution a l`etude de la lecture des cristaux du calorimetre electromagnetique de l`experience CMS au LHC

Abstract

The search for neutral Higgs boson through its decay into two photons provides a very promising signal for a mass between 90 and 150 GeV. It requires an electromagnetic calorimeter of very high resolution. The CMS (Compact Muon Solenoid) electromagnetic calorimeter must be made up of more than 80,000 lead tungstate crystals. In the central part (the barrel), the scintillation light readout is performed by means of avalanche photodiodes, a silicon photo-sensor with internal gain which is a relative novelty in high energy physics. Concerning the readout electronics, the energy available in the centre-of-mass (14 TeV) as well as the collision frequency (40 MHz) of LHC impose constraints with respect to the signal treatment up to the acquisition. The retained solution consists in pairing two avalanche photodiodes, the parameters of which (gain, temperature dependence, dark current, etc) must be controlled, and coupling them to a low noise preamplifier of high dynamical range (5 MeV - 2 TeV) followed by a four-slopes linear compressor and a analog-digital sampling converter of 12 bits, 40 MHz. The thesis presents the prototypes of different electromagnetic calorimeters tested in the high energy beam. An energy resolution of 0.6% at 100 GeV was obtained with a  More>>
Authors:
Martin, Franck [1] 
  1. Universite Claude Bernard Lyon-1, 69 - Lyon (France)
Publication Date:
Jul 03, 1998
Product Type:
Thesis/Dissertation
Report Number:
LYCEN-T-9840
Reference Number:
SCA: 440104; PA: AIX-30:041583; EDB-99:093183; SN: 99002144115
Resource Relation:
Other Information: DN: 73 refs., 100 figs., 19 tabs.; TH: Theses (Ph.D); PBD: 3 Jul 1998
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; CALORIMETERS; CERN LHC; CRYSTALS; ENERGY RESOLUTION; GEV RANGE 10-100; GEV RANGE 100-1000; HIGGS BOSONS; LEAD TUNGSTATES; MUONS; RADIATION DETECTION; READOUT SYSTEMS; SCINTILLATOR-PHOTODIODE DETECTORS; TEV RANGE 10-100
OSTI ID:
682756
Research Organizations:
Universite Claude Bernard Lyon-1, 69 - Lyon (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE99633376; TRN: FR9903094041583
Availability:
INIS; OSTI as DE99633376
Submitting Site:
FRN
Size:
126 p.
Announcement Date:

Citation Formats

Martin, Franck. Contribution to the study of the readout of the electromagnetic calorimeter crystals in the CMS experiment at LHC; Contribution a l`etude de la lecture des cristaux du calorimetre electromagnetique de l`experience CMS au LHC. France: N. p., 1998. Web.
Martin, Franck. Contribution to the study of the readout of the electromagnetic calorimeter crystals in the CMS experiment at LHC; Contribution a l`etude de la lecture des cristaux du calorimetre electromagnetique de l`experience CMS au LHC. France.
Martin, Franck. 1998. "Contribution to the study of the readout of the electromagnetic calorimeter crystals in the CMS experiment at LHC; Contribution a l`etude de la lecture des cristaux du calorimetre electromagnetique de l`experience CMS au LHC." France.
@misc{etde_682756,
title = {Contribution to the study of the readout of the electromagnetic calorimeter crystals in the CMS experiment at LHC; Contribution a l`etude de la lecture des cristaux du calorimetre electromagnetique de l`experience CMS au LHC}
author = {Martin, Franck}
abstractNote = {The search for neutral Higgs boson through its decay into two photons provides a very promising signal for a mass between 90 and 150 GeV. It requires an electromagnetic calorimeter of very high resolution. The CMS (Compact Muon Solenoid) electromagnetic calorimeter must be made up of more than 80,000 lead tungstate crystals. In the central part (the barrel), the scintillation light readout is performed by means of avalanche photodiodes, a silicon photo-sensor with internal gain which is a relative novelty in high energy physics. Concerning the readout electronics, the energy available in the centre-of-mass (14 TeV) as well as the collision frequency (40 MHz) of LHC impose constraints with respect to the signal treatment up to the acquisition. The retained solution consists in pairing two avalanche photodiodes, the parameters of which (gain, temperature dependence, dark current, etc) must be controlled, and coupling them to a low noise preamplifier of high dynamical range (5 MeV - 2 TeV) followed by a four-slopes linear compressor and a analog-digital sampling converter of 12 bits, 40 MHz. The thesis presents the prototypes of different electromagnetic calorimeters tested in the high energy beam. An energy resolution of 0.6% at 100 GeV was obtained with a conventional readout circuitry, while the integrated associated circuits were radiation resistant 73 refs., 100 figs., 19 tabs.}
place = {France}
year = {1998}
month = {Jul}
}