The CMS ECAL Barrel HV system

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Published 18 February 2013 Published under licence by IOP Publishing Ltd
, , Citation A Bartoloni et al 2013 JINST 8 C02039 DOI 10.1088/1748-0221/8/02/C02039

1748-0221/8/02/C02039

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.

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10.1088/1748-0221/8/02/C02039