Alexopoulos, T Altintas, A A Alviggi, M Arik, M Cetin, S A Tcherniatine, V Cheu, E Della Volpe, D Dris, M Fassouliotis, D Gazis, E N Giordano, R Gratchev, V Guan, L Iengo, P Ioannou, P Li, C Johns, K Kaushik, V Khodinov, A Kourkoumelis, C Maltezos, S Mermigka, K Muller, H Nikolopoulos, K Park, W Persembe, S Petridou, C Petti, R Polychronakos, V Purohit, M V Sampsonidis, D Sekhniaidze, G Shao, M Sun, Y J Tsipolitis, G Veenhof, R Wang, X L Wotschack, J Wu, S X Zhao, T Zhao, Z G Development of large size Micromegas detector for the upgrade of the ATLAS muon system Nucl. Instrum. Methods Phys. Res., A 161-165 617 With the luminosity upgrade of the LHC machine (SLHC, Super-LHC), the Muon system of the ATLAS experiment at CERN will also need a detector upgrade in the highest rapidity region. MAMMA, Muon ATLAS Micromegas Activity, is an ongoing R&D activity with the aim to develop large detectors based on the bulk-Micromegas technology for use in the ATLAS Muon Spectrometer. Micromegas is a good potential candidate for the construction of large muon chambers that combine trigger and tracking capability and can sustain high particle rates expected at the SLHC. A medium size Micromegas prototype, in scale 1:10 of the final chambers, has been built and evaluated in the laboratory and in beam tests at CERN. Results from the analysis of test-beam data are presented. The results indicate that large size Micromegas is a viable candidate for ATLAS Muon upgrade. eng 2010

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