ATLAS Muon DCS Upgrades and Optimizations

The Muon subsystem is comprised of four detector types: Resistive Plate Chambers (RPC) and Thin Gap Chambers (TGC) for trigger purposes, and Cathode Strip Chambers (CSC) and Muon Drift Tubes (MDT) for muon track reconstruction. The MDTs cover a large area at the outer part of the detector. In total, there are over a 1’000 MDT chambers, which are made of about 350’000 tubes. The luminosity upgrade of the HL-LHC is expected to pose a serious challenge to the MDTs. The expected increase of particle flux will set new, higher standards regarding the operation and control of the chambers. A step towards optimizing the ATLAS Muon Detector Control System (DCS) was to develop several DCS tools, namely a High Luminosity vs Trip Limit panel with its accompanying scripts and managers. The ultimate goal of this tool is to protect the MDT chambers from the rising particle flux and its associated increase in chamber current. In addition to optimizing the ATLAS Muon DCS, several tasks to accommodate the newly installed BMG chambers in the DCS infrastructure have been carried out as well. The BMGs, which are similar to the original MDTs but have a smaller tube diameter, required the creation of new Finite State Machine (FSM) JTAG and Power Supply nodes, and the addition of their corresponding Data Point Elements (DPEs) to Oracle's PVSS2COOL archiving scheme. Finally, maintenance work has been conducted to the CSCs of the ATLAS small wheel, and further DCS upgrades have been implemented to their subsystem as well.