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Description
The Large Hadron Collider (LHC) restarted physics operations just three months ago, after completing two-year Long Shutdown (LS1). The ATLAS detector went through a number of improvements and additions during LS1. One of the major upgrades was that of the Cathode Strip Chambers (CSC) off-detector readout system, which has been replaced to overcome the limitation of operating at a maximum 70 kHz input rate. The new system is working at 100 kHz input rate handling the higher occupancy expected during Run 2 due to the increased beam energy and luminosity. SLAC led this upgrade: the SLAC high bandwidth data acquisition system with the Reconfigurable Cluster Element (RCE), which is also used by other experiments, was successfully implemented. Based on a new electronics standard (ATCA) it is the first system of its kind in ATLAS, with many others now planned. In this talk I will detail this new system and its integration into the overall muon system, which comprises three more detectors, Monitored Drift Tubes, Thin Gap Chambers and Resistive Plate Chambers. I will then discuss the re-commissioning of these four muon systems and their performance during data taking.