Showing papers by "Patrick Puzo published in 2006"

Energy linearity and resolution of the ATLAS electromagnetic barrel calorimeter in an electron test-beam

Abstract: A module of the ATLAS electromagnetic barrel liquid argon calorimeter was exposed to the CERN electron test-beam at the H8 beam line upgraded for precision momentum measurement. The available energies of the electron beam ranged from 10 to 245 GeV. The electron beam impinged at one point corresponding to a pseudo-rapidity of eta=0.687 and an azimuthal angle of phi=0.28 in the ATLAS coordinate system. A detailed study of several effects biasing the electron energy measurement allowed an energy reconstruction procedure to be developed that ensures a good linearity and a good resolution. Use is made of detailed Monte Carlo simulations based on Geant which describe the longitudinal and transverse shower profiles as well as the energy distributions. For electron energies between 15 GeV and 180 GeV the deviation of the measured incident electron energy over the beam energy is within 0.1%. The systematic uncertainty of the measurement is about 0.1% at low energies and negligible at high energies. The energy resolution is found to be about 10% sqrt(E) for the sampling term and about 0.2% for the local constant term.

Construction, assembly and tests of the ATLAS electromagnetic barrel calorimeter

Abstract: The construction and assembly of the two half barrels of the ATLAS central electromagnetic calorimeter and their insertion into the barrel cryostat are described. The results of the qualification tests of the calorimeter before installation in the LHC ATLAS pit are given.

Luminosity measurement at ATLAS - Development, construction and test of scintillating fibre prototype detectors

Abstract: We are reporting about a scintillating fibre tracking detector which is proposed for the precise determination of the absolute luminosity of the CERN LHC at interaction point 1 where the ATLAS experiment is located. The detector needs to track protons elastically scattered under mu rad angles in direct vicinity to the LHC beam. It is based on square shaped scintillating plastic fibres read out by multianode photomultiplier tubes and is housed in Roman Pots. We describe the design and construction of prototype detectors and the results of a beam test experiment at DESY. The excellent detector performance established in this test validates the detector design and supports the feasibility of the proposed challenging method of luminosity measurement. (c) 2006 Elsevier B.V. All rights reserved.

Test of Scintillating Fibres Prototype Detectors using the OPERA front-end read out chip

Abstract: This paper reports on the test beam performed in autumn 2005 with a setup using a chip developed for the OPERA experiment to readout signal produced by a scintillating fibres detector. The goals of this test beam period were mainly to check the performances of this type of detector as well as the possibility to use the OPERA chip. The results presented here confirm the possibility to use a similar detector for the future ATLAS luminometer as well as an ASIC with twice more channels than the OPERA chip and with some more functionality.