Design and test of power supply system for ATLAS muon spectrometer

In this paper, the problem of the Low Voltage (LV) and High Voltage (HV) power supply distribution of the MDT (Monitored Drift Tubes) detector is addressed. Due to the high number of channels (1168 for low voltage and twice for high voltage) involved and to the dimension of the apparatus, these power supply systems are very complicated. Both system are made of three different parts: a power generator, a system controller and an active distributor. The first two parts will be localized in the cavern close to the experimental area, so they are subjected to standard environmental conditions. The third part (the active distributor) will be placed in the experimental area on the platforms just outside the detector, where the environmental conditions are more severe, due to the presence of magnetic field (about 800 Gauss) and radiations. In the following we present the design specifications and tests for the power supply systems.