The ATLAS RPC Phase II upgrade for High Luminosity LHC era

Resistive Plate Chamber detectors (Santonico and Cardarelli 1981), (Cardarelli et al. 1988) play a crucial role in triggering events with muons in the ATLAS central region (CER 1997). In view of the High Luminosity LHC program, this system is facing a significant upgrade. In the next few years, 226 triplets of new generation RPCs will be installed in the innermost region of the ATLAS Muon Barrel Spectrometer while 80 triplets in the outer Muon Spectrometer (MS) region, increasing the number of tracking layers from 6 to 9, doubling the trigger lever arm and increasing the coverage. The new Barrel Inner RPCs (BI-RPC) have an improved rate capability up to 10 kHz/cm 2 to withstand the HL-LHC conditions (CER 2017). This contribution will present an overview of the ATLAS RPC Phase II project, the qualification of gas volumes and read out planes, the present status of RPC singlets production and tests.