The CMS ECAL barrel HV system

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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article numberC02039
JournalJournal of Instrumentation
Issue number2
StatePublished - Feb 2013


  • Calorimeters
  • Voltage distributions


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