The CMS ECAL Barrel HV system

Creators: Bartoloni, A.; Baccaro, S.; Barone, L. M.; Cavallari, F.; Dafinei, I.; del Re, D.; Diemoz, M.; Di Marco, E.; Grassi, M.; Longo, E.; Meridiani, P.; Micheli, F.; Organtini, G.; Nourbakhsh, S.; Paramatti, R.; Pellegrino, F.; Rahatlou, S.; Rovelli, C.; Sigamani, M.; Soffi, L.; CMS Collaboration

Abstract

The CMS electromagnetic calorimeter (ECAL) comprises 75848 scintillating lead tungstate crystals. 61200 crystals are contained in the ECAL Barrel section and are read out by avalanche photodiode (APD) with internal gain of about 50. This gain is achieved with a high voltage (HV) of about 400 Volts. The gain stability requirement implies a supply voltage stable to within 0.01%. We describe our experience with the installed Barrel HV power supply system, which has been used for data taking since 2008.

Additional Information

© 2013 CERN for the benefit of the CMS collaboration. Published under the terms of the Creative Commons Attribution 3.0 licence by IOP Publishing Ltd and Sissa Medialab srl. Any further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation and DOI. Received: November 14, 2012. Accepted: December 13, 2012. Published: February 18, 2013. We thank all the people that supported us during these 14 years of activities especially those of CAEN Company. We also thank Ing. Stefano Petrucci, designer of the A1520E module used in the system, for his crucial and continuous support to our work.

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