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Abstract
The LHCb ECAL is a shashlik calorimeter of 6016 cells, covering 7.68×6.24 m2 area. To monitor the readout chain of each ECAL cell, the LHCb ECAL is equipped with a LED based monitoring system. During the LHC Run I (2009-2012) it was found that the precision of the monitoring suffers from the radiation degradation of transparency of polystyrene clear fibers used to transport the LED light to the ECAL photomultipliers. In order to improve the performance of the monitoring system, and especially in view of significant increase of LHCb working luminosity foreseen after 2018, the present plastic fibers have been replaced by radiation hard quartz fibers. The performance of the old LHCb ECAL monitoring system during LHC Run I and the design of the upgraded system are discussed here.
Highlights
The LHCb ECAL design is described in [1]
To monitor the functionality of the readout chain of each ECAL cell and the stability of its characteristics, the LHCb ECAL is equipped with the LED based monitoring system
In order to enable the precise PMT gain following in ECAL, it was decided to replace in 2014 the present light guides to new ones, made of radiation tolerant quartz fibers
Summary
This content has been downloaded from IOPscience. Please scroll down to see the full text. Ser. 587 012013 (http://iopscience.iop.org/1742-6596/587/1/012013) View the table of contents for this issue, or go to the journal homepage for more. Download details: IP Address: 128.141.192.149 This content was downloaded on 16/11/2016 at 13:28. Please note that terms and conditions apply. You may be interested in: The ATLAS jet trigger performance in LHC Run I and Run II updates Shima Shimizu A shashlik calorimeter readout with silicon photomultipliers with no amplification of the output signal A Berra, D Bolognini, V Bonvicini et al Current status and performance of the LHCb electromagnetic and hadron calorimeters Irina Machikhiliyan and the LHCb calorimeter group Neutrino Masses at the LHC Frank F Deppisch Commissioning of the LHCb preshower detector with cosmic rays and first LHC collisions Valentin Niess and the LHCb Collaboration The CMS Electromagnetic Calorimeter: overview, lessons learned during Run 1 and future projections Cristina Biino Exploring Jet-Hadron correlations at the LHC with ALICE Joel Mazer. 16th International Conference on Calorimetry in High Energy Physics (CALOR 2014)
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