The μ-RWELL technology for the muon system at the IDEA experiment

The project of a circular collider for electrons and positrons (FCC-ee) needs to be completed with a detection apparatus. The Innovative Detector for Electron–positron Accelerator (IDEA) experiment has been proposed to study the properties of heavy particles such as top, Z, W, and H with more precision. From the vertex outward, the apparatus is composed of a sophisticated tracker and a dual-readout electromagnetic calorimeter surrounded by a magnet, a dual-readout fiber calorimeter, and the muon system. The technology proposed for the muon system is the micro-Resistive WELL ($\mu$-RWELL). The muon system asks for 400 $\mu$m space resolution to tag muons and long-lived particles. Another point in favor of this technology is its suitability for industrial transfer, which is fundamental for mass production to cover more than the 1500 m${}^2$ planned for the apparatus. This publication reports the standard 1D tracking performance of the $\mu$-RWELL, including the dependence of spatial resolution on DLC resistivity and strip pitch. It also focuses on the R&D of different 2D readout layouts. All these studies have been conducted over several test beam campaigns performed at the CERN-SPS North Area during the last years.