Ricerc@Sapienza

Gas detectors for elementary particles require F-based gases for optimal performance.
Recent regulations demand the use of environmentally unfriendly F-based gases to be limited or
banned. This work studies properties of potential eco-friendly gas replacements by computing the
physical and chemical parameters relevant for use as detector media, and suggests candidates to be
considered for experimental investigation.

A full-size prototype of a Micromegas precision tracking chamber for the
upgrade of the ATLAS detector at the LHC Collider has been built between
October 2015 and April 2016. This paper describes in detail the procedures used
in constructing the single modules of the chamber in various INFN laboratories
and the final assembly at the Laboratori Nazionali di Frascati (LNF). Results
of the chamber exposure to the CERN SPS/H8 beam line in June 2016 are also
presented. The performances achieved in the construction and the results of the