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The High Voltage distribution system of the ATLAS Tile Calorimeter and its performance during data taking

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arxiv 1804.05036 v3 pith:BZU5OKNW submitted 2018-04-13 physics.ins-det hep-ex

The High Voltage distribution system of the ATLAS Tile Calorimeter and its performance during data taking

D. Calvet (1) , S. Calvet (1) , R. Chadelas (1) , D. Cinca (1 , 3) , P. Grenier (1 , 4) , P. Gris (1)
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P. Lafarguette (1) D. Lambert (1) M. Marjanovi\'c (1) L. F. Oleiro Seabra (2) F. M. Pedro Martins (2) J. B. Pena Madeira Gouveia De Campos (2 5) S. M. Romano Saez (1) P. Rosnet (1) C. Santoni (1) L. Val\'ery (1 6) F. Vazeille (1) ((1) Universit\'e Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand (2) Laborat\'orio de Instrumenta\c{c}\~ao e F\'isica Experimental de Part\'iculas LIP Lisboa (3) now at Technische Universitaet Dortmund (4) now at SLAC National Accelerator Laboratory Standford (5) now at LARSyS Instituto Superior T\'ecnico univ. Lisboa (6) now at DESY Hamburg)
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classification physics.ins-det hep-ex
keywords systematlasvoltagecalorimeterchannelsdatadistributionduring
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This article documents the characteristics of the high voltage (HV) system of the hadronic calorimeter TileCal of the ATLAS experiment. Such a system is suitable to supply reliable power distribution into particles physics detectors using a large number of PhotoMultiplier Tubes (PMTs). Measurements performed during the 2015 and 2016 data taking periods of the ATLAS detector show that its performance, in terms of stability and noise, fits the specifications. In particular, almost all the PMTs show a voltage instability smaller than 0.5 V corresponding to a gain stability better than 0.5%. A small amount of channels was found not working correctly. To diagnose the origin of such defects, the results of the HV measurements were compared to those obtained using a Laser system. The analysis shows that less than 0.2% of the about 10 thousand HV channels were malfunctioning.

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