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The LHCb Calorimeter Performance and its Expected Radiation-Induced Degradation

Abstract : The LHCb calorimeter comprises the scintillator pad detector, preshower, electromagnetic Shashlyk type (ECAL) and hadronic Tile calorimeters, arranged in pseudo-projective geometry. All the four detectors follow the general principle of reading the light from scintillator tiles with wave-length shifting fibers, and transporting the light towards photomultipliers, all following the 25 ns readout. The calorimeter has been installed in the LHCb experiment, cabled and equipped with the front end electronics. Calorimeter commissioning is ongoing using the cosmic rays and internal test procedures. The calorimeter has been pre-calibrated before installing in the pit, and the calibration techniques are being established using detailed Monte Carlo simulation, and relating on the test beam, radioactive source and cosmic ray measurements. Calorimeter time alignment using cosmic rays is another ongoing study. The mission of the LHCb calorimeter system aims at launching high ET hadron, electron, photon and πo candidates for the first level trigger, providing electron identification essential for the flavor tagging, and giving access to studies of B-meson decays with πo and prompt photons. Maximum expected annual dose acquired at the shower maximum position of the innermost ECAL cell amounts to 250 krad. The actual ECAL design assumes the possibility to replace the detector modules most subjected to the irradiation, so that the induced constant term of the energy resolution does not exceed 1.5%. Radiation resistance of the modules for the LHCb electromagnetic calorimeter was studied in order to optimize its design. The results of scintillating materials irradiation and the expected dose distribution map have been translated into the LHCb calorimeter performance degradation. Actual dose map at the LHCb calorimeter location for all the four calorimeter detectors and electronics will be monitored using sets of passive dosimeters, each comprising alanine, TLD and pin diode, and read out once per year. The presentation addresses the LHCb calorimeter commissioning, expected performance, summary of the irradiation tests, expected radiation induced performance degradation and actual dose monitoring.
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Contributor : Sabine Starita <>
Submitted on : Friday, July 2, 2010 - 3:35:28 PM
Last modification on : Wednesday, September 16, 2020 - 4:24:39 PM

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S. Barsuk. The LHCb Calorimeter Performance and its Expected Radiation-Induced Degradation. 10th International Conference on Inorganic Scintillators and their Applications (SCINT 2009), Jun 2009, Jeju, South Korea. pp.1447-1453, ⟨10.1109/TNS.2009.2033683⟩. ⟨in2p3-00497155⟩



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