14 research outputs found

    Laser monitoring system for the CMS lead tungstate crystal calorimeter

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    We report on the multiple wavelength laser monitoring system designed for the CMS lead tungstate crystal calorimeter read-out with avalanche photodiodes (Barrel calorimeters) and vacuum phototriodes (End Cap calorimeters). Results are presented for the test beam performance of the system designed to achieve 0.5% relative inter-calibration of the optical transmittance for lead tungstate scintillation emission over nearly 80 000 channels. The system operates in continuous measurement cycles to follow each crystal?s evolution under irradiation and recovery periods foreseen during operation at the LHC

    ATLAS detector and physics performance: Technical Design Report, 1

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    Performance of the ALEPH detector at LEP

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    The performance of the ALEPH detector at the LEP e+e− collider is reviewed. The accuracy of the tracking detectors to measure the impact parameter and momentum of charged tracks is specified. Calorimeters are used to measure photons and neutral hadrons, and the accuracy obtained in energy and angle is given. An essential property of the detector is its ability to identify particles; the performance in identification of electrons, muons, neutrinos (from missing energy), charged hadrons, π0's and V0's is described

    ALEPH: A detector for electron-positron annihilations at LEP

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    The design, construction and performace of a large 4pi solid angle detector with soleinoidal magnet is described. The detector serves to study electron-positron annihilation processes at a centre of mass energy between 80 and 200 GeV at the Large electron positron storage ring (LEP) at CERN
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