The large inner Micromegas modules for the Atlas Muon Spectrometer Upgrade: construction, quality control and characterization

TL;DR

This paper details the construction, quality control, and characterization of large Micromegas modules designed for the upgraded ATLAS Muon Spectrometer's inner detector, achieving high spatial resolution and rate capability.

Contribution

It presents the development and validation of the largest Micromegas detectors ever built for high-rate muon detection in the LHC upgrade.

Findings

Successful production of large-area Micromegas modules

Achieved 100 microns spatial resolution per plane

Validated detector performance with cosmic muon tests

Abstract

The steadily increasing luminosity of the LHC requires an upgrade with high-rate and high-resolution detector technology for the inner end cap of the ATLAS muon spectrometer: the New Small Wheels (NSW). In order to achieve the goal of precision tracking at a hit rate of about 15 kHz/cm$^2$ at the inner radius of the NSW, large area Micromegas quadruplets with 100\,\microns spatial resolution per plane have been produced. % IRFU, from the CEA research center of Saclay, is responsible for the production and validation of LM1 Micromegas modules. The construction, production, qualification and validation of the largest Micromegas detectors ever built are reported here. Performance results under cosmic muon characterisation will also be discussed.