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
Detailed simulation studies have been performed investigating the properties of the nominal ATLAS monitored drift tube (MDT) chamber gas (Ar/CO 2 -93/7) in presence of magnetic field. Results of the ...effect of magnetic field varying from 0.1 T to 1.5 T on muon tracks passing at different distances from the tube anode wire will be discussed. The simulation was based on the use of MAGBOLTZ and GARFIELD programs. Emphasis is given to the reliability of the second simulation program, which has been verified with comparisons of precision measurements provided in the bibliography.
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