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This article documents the characteristics of the high voltage (HV) system ofthe hadronic calorimeter TileCal of the ATLAS experiment. Such a system issuitable to supply reliable power distribution into particles physics detectorsusing a large number of PhotoMultiplier Tubes (PMTs). Measurements performedduring the 2015 and 2016 data taking periods of the ATLAS detector show thatits performance, in terms of stability and noise, fits the specifications. Inparticular, almost all the PMTs show a voltage instability smaller than 0.5 Vcorresponding to a gain stability better than 0.5%. A small amount of channelswas found not working correctly. To diagnose the origin of such defects, theresults of the HV measurements were compared to those obtained using a Lasersystem. The analysis shows that less than 0.2% of the about 10 thousand HVchannels were malfunctioning.

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