for the Phase II Upgrade of the ATLAS Tile Calorimeter

The experience gained in the operation of the present High Voltage system of the 12 Tile calorimeter in the ATLAS detector and the new HL-LHC constraints, in particular the 13 increase of the radiation, lead to the proposal of changing the currently embedded regulation 14 system to be a remote system in the counting room, by adding easily new functionalities. The 15 system described in this note is using the same regulation scheme as the current one and 16 distributes the individual High Voltage settings with 100 m long multi-conductor cables. The 17 tests show that it reaches the same good performance in terms of regulation stability and 18 noise, while allowing a permanent access to the electronics. 19 20