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New Detectors for the ATLAS Muon Systems

ATLAS Muon system
ATLAS Muon system
The current innermost stations of the ATLAS endcap muon tracking system must be upgraded to retain the good precision tracking and trigger capabilities in the high background environment expected with the upcoming luminosity increase of the LHC. Large area small-strip Thin Gap Chamber (sTGC) up to 2 m 2 in size and totalling an active area each of 1200 m 2 will be employed for fast and precise triggering.
In particular, the precision reconstruction of tracks requires a spatial resolution of about 100 μm to allow the Level-1 trigger track segments to be reconstructed with an angular resolution of approximately 1mrad. The upgraded detector will consist of eight layers each of Micromegas and sTGC’s detectors together forming the ATLAS New Small Wheels. The position of each strip must be known with an accuracy of 30 µm along the precision coordinate and 80 µm along the beam. On such large area detectors, the mechanical precision is a key point and then must be controlled and monitored all along the process of construction.

A full size sTGC quadruplet has been constructed and equipped with the first prototype of dedicated front-end electronics. The performance of the sTGC quadruplet has been evaluated in test beams, where the spatial resolution was measured. We will present results obtained from the test beams and discuss the status of the construction of the first full size Canadian sTGC quadruplet prototype.